Found 82 papers in cond-mat Ab initio molecular dynamics (AIMD) based on density functional theory (DFT)
has become a workhorse for studying the structure, dynamics, and reactions in
condensed matter systems. Currently, AIMD simulations are primarily carried out
at the level of generalized gradient approximation (GGA), which is at the 2nd
rung of DFT-functionals in terms of accuracy. Hybrid DFT functionals which form
the 4th rung in the accuracy ladder, are not commonly used in AIMD simulations
as the computational cost involved is $100$ times or higher. To facilitate AIMD
simulations with hybrid functionals, we propose here an approach that could
speed up the calculations by ~30 times or more for systems with a few hundred
of atoms. We demonstrate that, by achieving this significant speed up and
making the compute time of hybrid functional based AIMD simulations at par with
that of GGA functionals, we are able to study several complex condensed matter
systems and model chemical reactions in solution with hybrid functionals that
were earlier unthinkable to be performed.
Stacking ferroelectricity has been discovered in a wide range of van der
Waals materials and holds promise for applications, including photovoltaics and
high-density memory devices. We show that the microscopic origin of stacking
ferroelectric polarization can be generally understood as a consequence of
nontrivial Berry phase borne out of an effective Su-Schrieffer-Heeger model
description with broken sublattice symmetry, thus uniting novel two-dimensional
ferroelectricity with the modern theory of polarization. Our theory applies to
known stacking ferroelectrics such as bilayer transition-metal dichalcogenides
in 3R and T$_{\rm d}$ phases, as well as general AB-stacked bilayers with
honeycomb lattice and staggered sublattice potential. In addition to
establishing a unifying microscopic framework for stacking ferroelectrics the
quantum-geometric perspective provides key guiding principles for the design of
new van der Waals materials with robust ferroelectric polarization.
In the vicinity of continuous quantum phase transitions (QPTs), quantum
systems become scale-invariant and can be grouped into universality classes
characterized by sets of critical exponents. We have found that despite
scale-invariance and universality, the experimental data still contain
information related to the microscopic processes and scales governing QPTs. We
conjecture that near QPTs, various physical quantities follow the generic
exponential dependence predicted by the scaling theory of localization; this
dependence includes as a parameter a microscopic seeding scale of the
renormalization group, $L_0$. We also conjecture that for interacting systems,
the temperature cuts the renormalization group flow at the length travelled by
a system-specific elementary excitation over the life-time set by the Planckian
time, $\tau_P$=$\hbar/k_BT$. We have adapted this approach for QPTs in several
systems and showed that $L_0$ extracted from experiment is comparable to
physically-expected minimal length scales, namely (i) the mean free path for
metal-insulator transition in doped semiconductors, (ii) the distance between
spins in Heisenberg and Ising chains, (iii) the period of an optical lattice
for cold atom boson gases, and (iv) the period of a moir\'e superlattice for
the Mott QPT in dichalcogenide bilayers. In the first companion paper, we show
that in superconducting films and nanowires, as well as in the high temperature
superconductor La$_{1.92}$Sr$_{0.08}$CuO$_4$, $L_0$ is comparable to
superconducting coherence length. In the second companion paper, we show that
in quantum Hall systems, $L_0$ is comparable to the magnetic length. The
developed theoretical approach quantitatively explains and unifies a large body
of experimental data and can be expanded to other complex systems
Transformations between the plateau states of the quantum Hall effect (QHE)
are an archetypical example of quantum phase transitions (QPTs) between phases
with non-trivial topological order. These transitions appear to be
well-described by the single-particle network theories. The long-standing
problem with this approach is that it does not account for Coulomb
interactions. In this paper, we show that experimental data in the quantum
critical regime for both integer and fractional QHEs can be quantitatively
explained by the recently developed phenomenological model of QPTs in
interacting systems. This model assumes that all effects of interactions are
contained in the life-time of fluctuations as set by the Planckian time
$\tau_P=\hbar/k_BT$. The dephasing length is taken as the distance traveled by
a non-interacting particle along the bulk edge state over this time. We show
that the model also provides quantitative description of QPTs between the
ground states of anomalous QHE and axion and Chern insulators. These analyzed
systems are connected in that the QPTs occur via quantum percolation. Combining
the presented results with the results of two companion papers, we conclude
that the Planckian time is the encompassing characteristic of QPTs in
interacting systems, independent of dimensionality and microscopic physics.
Twisted bilayer graphene (TBG) and other quasi-two-dimensional moir\'e
superlattices have attracted significant attention due to the emergence of
various correlated and topological states associated with the flat bands in
these systems. In this work, we theoretically explore the physical properties
of a new type of \textit{three dimensional graphite moir\'e superlattice}, the
bulk alternating twisted graphite (ATG) system with homogeneous twist angle,
which is grown by in situ chemical vapor decomposition method. Compared to TBG,
the bulk ATG system is bestowed with an additional wavevector degrees of
freedom due to the extra dimensionality. As a result, we find that when the
twist angle of bulk ATG is smaller than twice of the magic angle of TBG, there
always exist ``magic momenta" at which the in-plane Fermi velocities of the
moir\'e bands vanish. Moreover, topologically distinct flat bands of TBG at
different magic angles can even co-exist at different out-of-plane wavevectors
in a single bulk ATG system. Most saliently, when the twist angle is relatively
large, exactly dispersionless three dimensional zeroth Landau level would
emerge in the bulk ATG, which may give rise to robust three dimensional quantum
Hall effects over a large range of twist angles.
We show that thin layers of EuO, a ferromagnetic insulator, can be achieved
by topotactic reduction under titanium of a Eu2O3 film deposited on top of a
graphene template. The reduction process leads to the formation of a 7-nm thick
EuO smooth layer, without noticeable structural changes in the underlying
chemical vapor deposited (CVD) graphene. The obtained EuO films exhibit
ferromagnetism, with a Curie temperature that decreases with the initially
deposited Eu2O3 layer thickness. By adjusting the thickness of the Eu2O3 layer
below 7 nm, we promote the formation of EuO at the very graphene interface: the
EuO/graphene heterostructure demonstrates the anomalous Hall effect (AHE),
which is a fingerprint of proximity-induced spin polarization in graphene. The
AHE signal moreover persists above Tc up to 350K due to a robust
super-paramagnetic phase in EuO. This original high-temperature magnetic phase
is attributed to magnetic polarons in EuO: we propose that the high strain in
our EuO films grown on graphene stabilizes the magnetic polarons up to room
temperature. This effect is different from the case of bulk EuO in which
polarons vanish in the vicinity of the Curie temperature Tc= 69K.
Multi-directional spin-to-charge conversion - in which spin polarizations
with different orientations can be converted into a charge current in the same
direction - has been demonstrated in low-symmetry materials and interfaces.
This is possible because, in these systems, spin to charge conversion can occur
in unconventional configurations in which spin polarization and charge current
where charge current, spin current and polarization do not need to be mutually
orthogonal. Here, we explore, in the low temperature regime, the spin-to-charge
conversion in heterostructures of graphene with the low-symmetry 1T' phase of
MoTe$_2$. First, we observe the emergence of charge conversion for out-of-plane
spins at temperatures below 100 K. This unconventional component is allowed by
the symmetries of both MoTe$_2$ and graphene and likely arises from spin Hall
effect in the spin-orbit proximitized graphene. Moreover, we examine the
low-temperature evolution of non-local voltage signals arising from the charge
conversion of the two in-plane spin polarizations, which have been previously
observed at higher temperature. As a result, we report omni-directional
spin-to-charge conversion - for all spin polarization orientations - in
graphene/MoTe${_2}$ heterostructures at low temperatures.
We study the role of size effects on atomic collapse of charged impurity in
the flat band system. The tight-binding simulations are made for the dice
lattice with circular quantum dot shapes. It is shown that the mixing of in-gap
edge states with bound states in impurity potential leads to increasing the
critical charge value. This effect, together with enhancement of gap due to
spatial quantization, makes it more difficult to observe the
dive-into-continuum phenomenon in small quantum dots. At the same time, we show
that if in-gap states are filled, the resonant tunneling to bound state in the
impurity potential might occur at much smaller charge, which demonstrates
non-monotonous dependence with the size of sample lattice. In addition, we
study the possibility of creating supercritical localized potential well on
different sublattices, and show that it is possible only on rim sites, but not
on hub site. The predicted effects are expected to naturally occur in
artificial flat band lattices.
While the surface-bulk correspondence has been ubiquitously shown in
topological phases, the relationship between surface and bulk in Landau-like
phases is much less explored. Theoretical investigations since 1970s for
semi-infinite systems have predicted the possibility of the surface order
emerging at a higher temperature than the bulk, clearly illustrating a
counterintuitive situation and greatly enriching phase transitions. But
experimental realizations of this prediction remain missing. Here, we
demonstrate the higher-temperature surface and lower-temperature bulk phase
transitions in CrSBr, a van der Waals (vdW) layered antiferromagnet. We
leverage the surface sensitivity of electric dipole second harmonic generation
(SHG) to resolve surface magnetism, the bulk nature of electric quadrupole SHG
to probe bulk spin correlations, and their interference to capture the two
magnetic domain states. Our density functional theory calculations show the
suppression of ferromagnetic-antiferromagnetic competition at the surface
responsible for this enhanced surface magnetism. Our results not only show
unexpected, richer phase transitions in vdW magnets, but also provide viable
ways to enhance magnetism in their 2D form.
The latest discovery of high temperature superconductivity near 80K in
La3Ni2O7 under high pressure has attracted much attention. Many proposals are
put forth to understand the origin of superconductivity. The determination of
electronic structures is a prerequisite to establish theories to understand
superconductivity in nickelates but is still lacking. Here we report our direct
measurement of the electronic structures of La3Ni2O7 by high-resolution
angle-resolved photoemmission spectroscopy. The Fermi surface and band
structures of La3Ni2O7 are observed and compared with the band structure
calculations. A flat band is formed from the Ni-3dz2 orbitals around the zone
corner which is 50meV below the Fermi level. Strong electron correlations are
revealed which are orbital- and momentum-dependent. Our observations will
provide key information to understand the origin of high temperature
superconductivity in La3Ni2O7.
We study an analytically solvable and experimentally relevant
number-conserving periodically driven $p$-wave superconductor. Such a system is
found to support generalized Majorana zero and $\pi$ modes which, despite being
non-Hermitian, are still capable of encoding qubits. Moreover, appropriate
winding numbers characterizing the topology of such generalized Majorana modes
are defined and explicitly calculated. We further discuss the fate of the
obtained generalized Majorana modes in the presence of finite charging energy.
Finally, we shed light on the quantum computing prospects of such modes by
demonstrating the robustness of their encoded qubits and explicitly braiding a
pair of generalized Majorana modes.
Kagome lattices have emerged as an ideal platform for exploring various
exotic quantum phenomena such as correlated topological phases, frustrated
lattice geometry, unconventional charge density wave orders, Chern quantum
phases, superconductivity, etc. In particular, the vanadium based nonmagnetic
kagome metals AV3Sb5 (A= K, Rb, and Cs) have seen a flurry of research interest
due to the discovery of multiple competing orders. Here, we report the
discovery of a new Ti based kagome metal YbTi3Bi4 and employ angle-resolved
photoemission spectroscopy (ARPES), magnetotransport in combination with
density functional theory calculations to investigate its electronic structure.
We reveal spectroscopic evidence of multiple flat bands arising from the kagome
lattice of Ti with predominant Ti 3d character. Through our calculations of the
Z2 indices, we have identified that the system exhibits topological
nontriviality with surface Dirac cones at the Gamma point and a quasi
two-dimensional Dirac state at the K point which is further confirmed by our
ARPES measured band dispersion. These results establish YbTi3Bi4 as a novel
platform for exploring the intersection of nontrivial topology, and electron
correlation effects in this newly discovered Ti based kagome lattice.
Learning the electron scattering around atomic impurities is a fundamental
step to fully understand the basic electronic transport properties of realistic
conducting materials. Although many efforts have been made in this field for
several decades, atomic scale transport around single point-like impurities has
yet been achieved. Here, we report the direct visualization of the electric
current induced dipoles around single atomic impurities in epitaxial bilayer
graphene by multi-probe low temperature scanning tunneling potentiometry as the
local current density is raised up to around 25 A/m, which is considerably
higher than that in previous studies. We find the directions of these dipoles
which are parallel or anti-parallel to local current are determined by the
charge polarity of the impurities, revealing the direct evidence for the
existence of the carrier density modulation effect proposed by Landauer in
1976. Furthermore, by $in$ $situ$ tuning local current direction with contact
probes, these dipoles are redirected correspondingly. Our work paves the way to
explore the electronic quantum transport phenomena at single atomic impurity
level and the potential future electronics toward or beyond the end of Moore's
Law.
Experimental data show that under pressure, Gd goes through a series of
structural transitions hcp to Sm-type (close-packed rhombohedral) to dhcp that
is accompanied by a gradual decrease of the Curie temperature and magnetization
till the collapse of a finite magnetization close to the dhcp structure. We
explore theoretically the pressure-induced changes of the magnetic properties,
by describing these structural transitions as the formation of fcc stackings
faults. Using this approach, we are able to describe correctly the variation of
the Curie temperature with pressure, in contrast to a static structural model
using the hcp structure.
Competing measurements alone can give rise to distinct phases characterized
by entanglement entropy$\unicode{x2013}$such as the volume law phase,
symmetry-breaking (SB) phase, and symmetry-protected topological (SPT)
phase$\unicode{x2013}$that can only be discerned through quantum trajectories,
making them challenging to observe experimentally. In another burgeoning area
of research, recent studies have demonstrated that steering can give rise to
additional phases within quantum circuits. In this work, we show that new
phases can appear in measurement-only quantum circuit with steering. Unlike
conventional steering methods that rely solely on local information, the
steering scheme we introduce requires the circuit's structure as an additional
input. These steering induced phases are termed as "informative" phases. They
are distinguished by the intrinsic dimension of the bitstrings measured in each
circuit run, making them substantially easier to detect in experimental setups.
We explicitly show this phase transition by numerical simulation in three
circuit models that are previously well-studied: projective transverse field
Ising model, lattice gauge-Higgs model and XZZX model. When the informative
phase coincides with the SB phase, our steering mechanism effectively serves as
a "pre-selection" routine, making the SB phase more experimentally accessible.
Additionally, an intermediate phase may manifest, where a discrepancy arises
between the quantum information captured by entanglement entropy and the
classical information conveyed by bitstrings. Our findings demonstrate that
steering not only adds theoretical richness but also offers practical
advantages in the study of measurement-only quantum circuits.
In the creation of Hopf topological matters, the old paradigm is to conceive
the Hopf invariant first, and then display its intuitive topology through
links. Here we brush aside this effort and put forward a new recipe for
unraveling the quenched two-dimensional (2D) two-band Chern insulators under a
parallel quench protocol, which implies that the quench quantities with
different momentum k are parallel or antiparallel to each other. We find that
whether the dynamical Hopf invariant exists or not, the links in (2+1)D space
always keep their standard shape even for topological initial states, and trace
out the trajectories of phase vortices. The linking number is exactly equal to
the difference between pre- and post-quench Chern numbers regardless of the
construction of homotopy groups. We employ two concrete examples to illustrate
these results, highlighting the polarity reversal at fixed points.
Modulation of electronic properties of materials by electric fields is
central to the operation of modern semiconductor devices, providing access to
complex electronic behaviors and greater freedom in tuning the energy bands of
materials. Here, we explore one-dimensional superlattices induced by a
confining electrostatic potential in monolayer MoS$_2$, a prototypical
two-dimensional semiconductor. Using first-principles calculations, we show
that periodic potentials applied to monolayer MoS$_2$ induce electrostatic
superlattices in which the response is dominated by structural distortions
relative to purely electronic effects. These structural distortions reduce the
intrinsic band gap of the monolayer substantially while also polarizing the
monolayer through piezoelectric coupling, resulting in spatial separation of
charge carriers as well as Stark shifts that produce dispersive minibands.
Importantly, these minibands inherit the valley-selective magnetic properties
of monolayer MoS$_2$, enabling fine control over spin-valley coupling in
MoS$_2$ and similar transition-metal dichalcogenides.
Multiband superconductors are sources of rich physics arising from multiple
order parameters, which show unique collective dynamics including Leggett mode
as relative phase oscillations. Previously, it has been pointed out that the
Leggett mode can be optically excited in the linear response regime, as
demonstrated in a one-dimensional model for multiband superconductors[T.
Kamatani, et al., Phys. Rev. B 105, 094520 (2022)]. Here we identify the linear
coupling term in the Ginzburg-Landau free energy to be the so-called Lifshitz
invariant, which takes a form of
$\boldsymbol{d}\cdot\left(\Psi^{*}_{i}\nabla\Psi_{j} -
\Psi_{j}\nabla\Psi^{*}_{i}\right)$, where $\boldsymbol{d}$ is a constant vector
and $\Psi_{i}$ and $\Psi_{j}$ $(i\neq j)$ represent superconducting order
parameters. We have classified all pairs of irreducible representations of
order parameters in the crystallographic point groups that allow for the
existence of the Lifshitz invariant. We emphasize that the Lifshitz invariant
can appear even in systems with inversion symmetry. The results are applied to
a model of $s$-wave superconductors on a Kagome lattice with various bond
orders, for which in some cases we confirm that the Leggett mode appears as a
resonance peak in a linear optical conductivity spectrum based on microscopic
calculations. We discuss a possible experimental observation of the Leggett
mode by a linear optical response in multiband superconductors.
The domain walls between AB- and BA-stacked gapped bilayer graphene have
garnered intense interest as they host topologically-protected,
valley-polarised transport channels. The introduction of a twist angle between
the bilayers and the associated formation of a Moire pattern has been the
dominant method used to study these topological channels, but heterostrain can
also give rise to similar stacking domains and interfaces. Here, we
theoretically study the electronic structure of a uniaxially heterostrained
bilayer graphene. We discuss the formation and evolution of interface-localized
channels in the one-dimensional Moire pattern that emerges due to the different
stacking registries between the two layers. We find that a uniform heterostrain
is not sufficient to create one-dimensional topological channels in biased
bilayer graphene. Instead, using a simple model to account for the in-plane
atomic reconstruction driven by the changing stacking registry, we show that
the resulting expanded Bernal-stacked domains and sharper interfaces are
required for robust topological interfaces to emerge. These states are highly
localised in the AA- or SP-stacked interface regions and exhibit differences in
their layer and sublattice distribution depending on the interface stacking. We
conclude that heterostrain can be used as a mechanism to tune the presence and
distribution of topological channels in gapped bilayer graphene systems,
complementary to the field of twistronics.
Symmetry plays a key role in classifying topological phases. Recent theory
shows that in the presence of gauge fields, the algebraic structure of
crystalline symmetries needs to be projectively represented, which enables
unprecedented topological band physics. Here, we report a concrete acoustic
realization of mirror Chern insulators by exploiting the concept of projective
symmetry. More specifically, we introduce a simple but universal recipe for
constructing projective mirror symmetry, and conceive a minimal model for
achieving the projective symmetry-enriched mirror Chern insulators. Based on
our selective-excitation measurements, we demonstrate unambiguously the
projective mirror eigenvalue-locked topological nature of the bulk states and
associated chiral edge states. More importantly, we extract the non-abelian
Berry curvature and identify the mirror Chern number directly, as conclusive
experimental evidence for this exotic topological phase. All experimental
results agree well with the theoretical predictions. Our findings will shine
new light on the topological systems equipped with gauge fields.
Nodal-line semimetal is commonly believed to exist in $\mathcal{PT}$
symmetric or mirror-rotation symmetric systems. Here, we find a flux-induced
parameter-dimensional second-order nodal-line semimetal (SONLS), which has the
coexisting hinge Fermi arcs and drumhead surface states, in a two-dimensional
system without $\mathcal{PT}$ and mirror-rotation symmetries. Meanwhile, we
discover a flux-induced second-order topological insulator (SOTI). Then we
artificially create exotic hybrid-order nodal-line semimetals with fruitful
nodal-line structures hosted by different quasienergy gaps and widely tunable
numbers of corner states by applying a periodic driving on our SONLS and SOTI,
respectively. Such Floquet engineered high tunability of the orders and the
nodal-line structures of the SONLS and the corner-state number of SOTI sets up
a foundation on exploring their further applications.
A molecular dynamics simulation of sublimation of silicene and silicon films
of different thikness is performed. It is shown that thiner films sublimate at
lower temperatures. The sublimation temperature comes to a saturated value of
$T=1725$ K at the films thiker than $16$ atomc layers. These results are
consistent with the surface mediated collaps of the crystal structure. At the
same time this mechanism is different from the crystal structure collapse of
graphite and graphene.
The requirements for broadband photodetection are becoming exceedingly
demanding in hyperspectral imaging. Whilst intrinsic photoconductor arrays
based on mercury cadmium telluride represent the most sensitive and suitable
technology, their optical spectrum imposes a narrow spectral range with a sharp
absorption edge that cuts their operation to < 25 um. Here, we demonstrate a
giant ultra-broadband photoconductivity in twisted double bilayer graphene
heterostructures spanning a spectral range of 2 - 100 um with internal quantum
efficiencies ~ 40 % at speeds of 100 kHz. The giant response originates from
unique properties of twist-decoupled heterostructures including pristine,
crystal field induced terahertz band gaps, parallel photoactive channels, and
strong photoconductivity enhancements caused by interlayer screening of
electronic interactions by respective layers acting as sub-atomic spaced
proximity screening gates. Our work demonstrates a rare instance of an
intrinsic infrared-terahertz photoconductor that is complementary
metal-oxide-semiconductor compatible and array integratable, and introduces
twist-decoupled graphene heterostructures as a viable route for engineering
gapped graphene photodetectors with 3D scalability.
We provide sufficient conditions such that the time evolution of a mesoscopic
tight-binding open system with a local Hartree-Fock non-linearity converges to
a self-consistent non-equilibrium steady state, which is independent of the
initial condition from the "small sample". We also show that the steady charge
currents are given by Landauer-B\"uttikker-like formulas, and make the
connection with the case of weakly self-interacting many-body systems.
The interplay between symmetry and topology led to the concept of
symmetry-protected topological states, including all non-interacting and weakly
interacting topological quantum states. Among them, recently proposed nodal
line semimetal states with space-time inversion ($\mathcal{PT}$) symmetry which
are classified by the Stiefel-Whitney characteristic class associated with real
vector bundles and can carry a nontrivial $\mathbb{Z}_2$ monopole charge have
attracted widespread attention. However, we know less about such 3D
$\mathbb{Z}_2$ nodal line semimetals and do not know how to construct them. In
this work, we first extend the layer construction previously used to construct
topological insulating states to topological semimetallic systems. We construct
3D $\mathbb{Z}_2$ nodal line semimetals by stacking of 2D
$\mathcal{PT}$-symmetric Dirac semimetals via nonsymmorphic symmetries. Based
on our construction scheme, effective model and combined with first-principles
calculations, we predict two types of candidate electronic materials for
$\mathbb{Z}_2$ nodal line semimetals, namely 14 Si and Ge structures and 108
transition metal dichalcogenides $MX_2$ ($M$=Cr, Mo, W, $X$=S, Se, Te). Our
theoretical construction scheme can be directly applied to metamaterials and
circuit systems. Our work not only greatly enriches the candidate materials and
deepens the understanding of $\mathbb{Z}_2$ nodal line semimetal states but
also significantly extends the application scope of layer construction.
Magnetic topological quantum materials display a diverse range of fascinating
physical properties which arise from their intrinsic magnetism and the breaking
of time-reversal symmetry. However, so far, few examples of intrinsic magnetic
topological materials have been confirmed experimentally, which significantly
hinder our comprehensive understanding of the abundant physical properties in
this system. The kagome lattices, which host diversity of electronic structure
signatures such as Dirac nodes, flat bands, and saddle points, provide an
alternative and promising platform for in-depth investigations into
correlations and band topology. In this article, drawing inspiration from the
stacking configuration of MnBi$_2$Te$_4$, we conceive and then synthesize a
high-quality single crystal EuTi$_3$Bi$_4$, which is a unique natural
heterostructure consisting of both topological kagome layers and magnetic
interlayers. We investigate the electronic structure of EuTi$_3$Bi$_4$ and
uncover distinct features of anisotropic multiple Van Hove singularitie (VHS)
that might prevent Fermi surface nesting, leading to the absence of a charge
density wave (CDW). In addition, we identify the topological nontrivial surface
states that serve as connections between different saddle bands in the vicinity
of the Fermi level. Combined with calculations, we establish that, the
effective time-reversal symmetry S=$\theta$$\tau_{1/2}$ play a crucial role in
the antiferromagnetic ground state of EuTi$_3$Bi$_4$, which ensures the
stability of the topological surface states and gives rise to their intriguing
topological nature. Therefore, EuTi$_3$Bi$_4$ offers the rare opportunity to
investigate correlated topological states in magnetic kagome materials.
Spin-orbit coupling arising from the relativistic Dirac equation underpins
fundamental and applied research areas such as the spin Hall effects and
topological insulators. This Dirac mechanism of spin-orbit coupling induces in
non-centrosymmetric crystals a momentum-dependent spin splitting typically
limited to a meV scale unless involving heavy and often toxic elements. Here we
identify a previously overlooked mechanism that shares with the Dirac mechanism
the characteristic signature of spin-orbit coupling, namely the antisymmetric
time-reversal-invariant spin polarization in the band structure. In contrast to
the relativistic Dirac equation, our spin-orbit coupling arises from the
magnetic exchange interaction in non-centrosymmetric crystals with a
non-coplanar spin order. An unconventional p-wave magnetic phase, corresponding
to this exchange spin-orbit coupling, represents a long-sought but elusive
realization of a magnetic counterpart of the p-wave phase of superfluid He-3.
We identify type-A exchange spin-orbit coupling realized on mutually-shifted
opposite-spin Fermi surfaces, and type-B on one Fermi surface. We predict giant
spin splitting magnitudes on the scale of hundreds of meV in realistic material
candidates, namely in antiperovskite Ce$_3$InN and Mn$_3$GaN. Our results open
a possibility for realizing large exchange spin-orbit coupling phenomena in
materials comprising abundant light elements and with implications in fields
ranging from spintronics, dissipationless nanoelectronics and quantum
electronics, to topological matter.
Here we report the formation of type-A and type-B electronic junctions
without any structural discontinuity along a well-defined 1-nm-wide
one-dimensional electronic channel within a van der Waals layer. We employ
scanning tunneling microscopy and spectroscopy techniques to investigate the
atomic and electronic structure along peculiar domain walls formed on the
charge-density-wave phase of 1T-TaS2. We find distinct kinds of abrupt
electronic junctions with discontinuities of the band gap along the domain
walls, which do not have any structural kinks and defects. Our
density-functional calculations reveal a novel mechanism of the electronic
junction formation; they are formed by a kinked domain wall in the layer
underneath through substantial electronic interlayer coupling. This work
demonstrates that the interlayer electronic coupling can be an effective
control knob over several-nanometer-scale electronic property of
two-dimensional atomic monolayers.
Macroscopic objects supported by surface tension at the fluid interface can
self-assemble through the action of capillary forces arising from interfacial
deformations. The resulting self-assembled structures are ordered but remain
trapped in one of potentially many metastable states in the capillary energy
landscape. This contrasts with microscopic colloidal self-assembly where
thermal fluctuations excite transitions between geometrically distinct
ground-state configurations. We herein utilize supercritical Faraday waves to
drive structural rearrangements between metastable states of few-particle
clusters of millimetric spheres bound by capillary attractions at the fluid
interface. Using a combination of experiments and theoretical modelling, we
demonstrate how the occupation probabilities of different cluster topologies
and transition statistics are controlled by the level of the vibrational
forcing and the spatial extent of long-range capillary forces. Our results
demonstrate how self-assembly dynamics and statistics may be manipulated across
scales by controlling the strength of fluctuations and by tuning the properties
of the particle interaction-potential.
Employing a combination of first-principles calculations and low-energy
effective models, we present a comprehensive investigation on the electronic
structure of Pb$_{10}$(PO$_{4}$)$_{6}$O$_{4}$, which exhibits remarkable
quasi-one-dimensional flat-band around the Fermi level that contains novel
multi-dimensional fermions. These flat bands predominantly originate from
$p_x/p_y$ orbital of the oxygen molecules chain at $4e$ Wyckoff positions, and
thus can be well-captured by a four-band tight-binding model. Furthermore, the
abundant crystal symmetry inherent to Pb$_{10}$(PO$_{4}$)$_{6}$O$_{4}$ provides
an ideal platform for the emergence of various multi-dimensional fermions,
including a 0D four-fold degenerated Dirac fermion with quadratic dispersion, a
1D quadratic/linear nodal-line (QNL/LNL) fermion along symmetric $k$-paths, 1D
hourglass nodal-line (HNL) fermion linked to the Dirac fermion, and a 2D
symmetry-enforced nodal surface (NS) found on the $k_z$=$\pi$ plane. Moreover,
when considering the weak ferromagnetic order, Pb$_{10}$(PO$_{4}$)$_{6}$O$_{4}$
transforms into a rare semi-half-metal, which is characterized by the presence
of Dirac fermion and HNL fermion at the Fermi level for a single spin channel
exhibiting 100$\%$ spin polarization. Our findings reveal the coexistence of
flat bands, diverse topological semimetal states and ferromagnetism within in
Pb$_{10}$(PO$_{4}$)$_{6}$O$_{4}$, which may provide valuable insights for
further exploring intriguing interplay between superconductivity and exotic
electronic states.
Quantum processors based on integrated nanoscale silicon spin qubits are a
promising platform for highly scalable quantum computation. Current CMOS spin
qubit processors consist of dense gate arrays to define the quantum dots,
making them susceptible to crosstalk from capacitive coupling between a dot and
its neighbouring gates. Small but sizeable spin-orbit interactions can transfer
this electrostatic crosstalk to the spin g-factors, creating a dependence of
the Larmor frequency on the electric field created by gate electrodes
positioned even tens of nanometers apart. By studying the Stark shift from tens
of spin qubits measured in nine different CMOS devices, we developed a
theoretical frawework that explains how electric fields couple to the spin of
the electrons in increasingly complex arrays, including those electric
fluctuations that limit qubit dephasing times $T_2^*$. The results will aid in
the design of robust strategies to scale CMOS quantum technology.
We investigate the interplay between the quantum Hall (QH) effect and
superconductivity in InAs surface quantum well (SQW)/NbTiN heterostructures
using a quantum point contact (QPC). We use QPC to control the proximity of the
edge states to the superconductor. By measuring the upstream and downstream
resistances of the device, we investigate the efficiency of Andreev conversion
at the InAs/NbTiN interface. Our experimental data is analyzed using the
Landauer-Buttiker formalism, generalized to allow for Andreev reflection
processes. We show that by varying the voltage of the QPC, $V_{QPC}$, the
average Andreev reflection, $A$, at the QH-SC interface can be tuned from 50%
to 10%. The evolution of $A$ with $V_{QPC}$ extracted from the measurements
exhibits plateaus separated by regions for which $A$ varies continuously with
$V_{QPC}$. The presence of plateaus suggests that for some ranges of $V_{QPC}$
the QPC might be pinching off almost completely from the QH-SC interface some
of the edge modes. Our work shows a new experimental setup to control and
advance the understanding of the complex interplay between superconductivity
and QH effect in two-dimensional gas systems.
Composites with high strength and high fracture resistance are desirable for
structural and protective applications. Most composites, however, suffer from
poor damage tolerance and are prone to unpredictable fractures. Understanding
the behavior of materials with an irregular reinforcement phase offers
fundamental guidelines for tailoring their performance. Here, we study the
fracture nucleation and propagation in two phase composites, as a function of
the topology of their irregular microstructures. We use a stochastic algorithm
to design the polymeric reinforcing network, achieving independent control of
topology and geometry of the microstructure. By tuning the local connectivity
of isodense tiles and their assembly into larger structures, we tailor the
mechanical and fracture properties of the architected composites, at the local
and global scale. Finally, combining different reinforcing networks into a
spatially determined meso-scale assembly, we demonstrate how the spatial
propagation of fractures in architected composite materials can be designed and
controlled a priori.
We study topological defect lines (TDLs) in two-dimensional $\mathbb
Z_N$-parafermoinic CFTs. Different from the bosonic case, in the 2d
parafermionic CFTs, there exist parafermionic defect operators that can live on
the TDLs and satisfy interesting fractional statistics. We propose a
categorical description for these TDLs, dubbed as ``para-fusion category",
which contains various novel features, including $\mathbb Z_M$ $q$-type objects
for $M\vert N$, and parafermoinic defect operators as a type of specialized
1-morphisms of the TDLs. The para-fusion category in parafermionic CFTs can be
regarded as a natural generalization of the super-fusion category for the
description of TDLs in 2d fermionic CFTs. We investigate these distinguishing
features in para-fusion category from both a 2d pure CFT perspective, and also
a 3d anyon condensation viewpoint. In the latter approach, we introduce a
generalized parafermionic anyon condensation, and use it to establish a functor
from the parent fusion category for TDLs in bosonic CFTs to the para-fusion
category for TDLs in the parafermionized ones. At last, we provide many
examples to illustrate the properties of the proposed para-fusion category, and
also give a full classification for a universal para-fusion category obtained
from parafermionic condensation of Tambara-Yamagami $\mathbb Z_N$ fusion
category.
We investigate a two-level system with alternating XX coupling in a photon
cavity. It is mapped to a free boson model equally coupled to a photon, whose
interaction is highly nonlocal. Some intriguing topological phenomena emerge as
a function of the photon coupling. The photon energy level anticrosses the
zero-energy topological edges at a certain photon coupling, around which the
symmetric edge state acquires nonzero energy due to the mixing with the photon.
Furthermore, the photon state is transformed into the topological zero-energy
edge or corner state when the photon coupling is strong enough. It is a
cavity-induced topological edge or corner state. On the other hand, the other
topological edge or corner states do not couple with the photon and remains at
zero energy even in the presence of the cavity. We analyze a cavity-induced
topological edge state in the Su-Schrieffer-Heeger model and a cavity-induced
topological corner state in the breathing Kagome model.
In this study, we conducted experiments on CaC6 for elucidating the
Na-catalyzed formation mechanism and achieving rapid mass synthesis of graphite
intercalation compounds (GICs). Rapidly synthesized CaC6 was characterized by
analysis of its crystal structure and physical properties. We found that the
formation of the reaction intermediate Na-GIC (NaCx, x = 64) requires a larger
amount of Na than is intercalated between the graphite interlayers. The
requirement for excess Na may provide insights into the mechanism of
Na-catalyzed GIC formation. A Na-to-C molar mixing ratio of 1.5-2.0:6 was
suitable for the efficient formation of CaC6 under heat treatment at 250{\deg}C
for 2 h, and the catalytic Na remaining in the sample was demonstrably reduced
to a Na:Ca ratio of approximately 3:97. The upper critical field Hc2 was
enhanced approximately three times compared to those of previous reports. Based
on X-ray diffraction and experimental parameter analysis, we concluded that the
enhancement of Hc2 was attributed to the disordered stacking sequence in CaC6,
possibly because of the rapid and low-temperature formation. Physical
properties derived from specific heat measurements were comparable to those of
high-quality CaC6, which is slowly synthesized using the molten Li-Ca alloy
method. This study provides new avenues for future research and exploration in
the rapid mass synthesis of GICs as practical materials, for applications such
as battery electrodes and superconducting wires.
The introduction of lubricant between fluid and substrate endows the
Liquid-Infused Slippery Surfaces with excellent wetting properties: low contact
angle, various liquids repellency, ice-phobic and self-healing. Droplets moving
on such surfaces have been widely demonstrated to obey a
Landau-Levich-Derjaguin (LLD) friction. Here, we show that this power law is
surprisingly decreased with the droplet accelerates: in the rapid droplet
regime, the slippery surfaces seem more slippery than LLD friction. Combining
experimental and numerical techniques, we find that the meniscus surrounding
the droplet exhibits an incompletely developed state. The Incompletely
Developed Meniscus possesses shorter shear length and thicker shear thickness
than the prediction of Bretherton model and therefore is responsible for the
more slippery regime. With an extended Bretherton model, we not only provide an
analytical description to the IDM behavior but also the friction when the
Capillary Number of the moving droplet is larger than the Critical Capillary
Number.
Magic-angle twisted bilayer graphene (MATBG) has been extensively explored
both theoretically and experimentally as a suitable platform for a rich and
tunable phase diagram that includes ferromagnetism, charge order, broken
symmetries, and unconventional superconductivity. In this work, we investigate
the intricate interplay between long-range electron-electron interactions, spin
fluctuations, and superconductivity in MATBG. By employing a low-energy model
for MATBG that captures the correct shape of the flat bands, we explore the
effects of short- and long-range interactions on spin fluctuations and their
impact on the superconducting (SC) pairing vertex in the Random Phase
Approximation (RPA). We find that the SC state is notably influenced by the
strength of long-range Coulomb interactions. Interestingly, our RPA
calculations indicate that there is a regime where the system can traverse from
a magnetic phase to the SC phase by \emph{increasing} the relative strength of
long-range interactions compared to the on-site ones. These findings underscore
the relevance of electron-electron interactions in shaping the intriguing
properties of MATBG and offer a pathway for designing and controlling its SC
phase.
Circular dichroism in angle-resolved photoemission (CD-ARPES) is one of the
promising techniques for obtaining experimental insight into topological
properties of novel materials, in particular to the orbital angular momentum
(OAM) in dispersive bands, which might be related, albeit certainly in a
non-trivial way, to the momentum resolved Berry curvature of the bands.
Therefore, it is important to understand how non-vanishing CD-ARPES signal
arises in graphene, a material where Dirac bands are made from C $|2p_z\rangle$
orbitals that carry zero OAM, spin-orbit-coupling (SOC) can be neglected, and
Berry curvature effectively vanishes. Dubs et al., Phys. Rev. B 32, 8389 (1985)
have demonstrated non-vanishing cricular dichroism in angular distribution
(CDAD) from an oriented $p_z$ orbital, and this process can be responsible for
the experimentally observed CD-ARPES in graphene. In this paper, we derive the
CD-ARPES from $p_z$ orbitals by elementary means, using only simple algebraic
formulas and tabulated numerical values, and show that it leads to significant
CD-ARPES signal over the entire vacuum ultraviolet and soft x-ray energy range,
with an exception of the photon energy region near $h\nu \approx 40$ eV. We
also demonstrate that another process, emerging from the finite electron
inelastic mean free path, also leads to CD-ARPES of the potentially similar
order of magnitude, as previously discussed by Moser, J. Electron Spectrosc.
Relat. Phenom. 214, 29 (2017). We present calculated CDAD maps for selected
orbitals and briefly discuss the consequences of the findings for CD-ARPES,
focusing on graphene, graphite and WSe$_2$.
Coulomb impurity of charge $Ze$ is known to destabilize the ground state of
undoped graphene with respect to creation of screening space charge if $Z$
exceeds a critical value of $1/2\alpha$ set by material's fine structure
constant $\alpha$. Recent experimental advances made it possible to explore
this transition in a controlled manner by tuning $Z$ across the critical point.
Combined with relatively large value of $\alpha$ this opens a possibility to
study graphene's screening response to a supercritical impurity $Z\alpha\gg1$
when the screening charge is large, and the Thomas-Fermi analysis, that we
revisit, is adequate. The character of screening in this regime is controlled
by the dimensionless screening parameter $Z\alpha^{2}$. Specifically, for
circular impurity cluster most of the screening charge in the weak-screening
regime $Z\alpha^{2}\ll1$ is found to reside outside the cluster. The
strong-screening regime $Z\alpha^{2}\gg1$ provides a realization of the Thomson
atom: most of the screening charge is inside the cluster nearly perfectly
neutralizing the source charge with the exception of a transition layer near
cluster's edge where the rest of the space charge is localized.
Triphosphides, with a chemical formula of XP$_3$ (X is a group IIIA, IVA, or
VA element), have recently attracted much attention due to their great
potential in several applications. Here, using density functional theory
calculations, we describe for the first time the structural and electronic
properties of the bulk bismuth triphosphide (BiP$_3$). Phonon spectra and
molecular dynamics simulations confirm that the 3D crystal of BiP$_3$ is a
metal thermodynamically stable with no bandgap. Unlike the bulk, the mono-,
bi-, tri-, and tetra-layers of BiP$_3$ are semiconductors with a bandgap
ranging from 1.4 to 0.06 eV. However, stackings with more than five layers
exhibit metallic behavior equal to the bulk. The results show that quantum
confinement is a powerful tool for tuning the electronic properties of BiP$_3$
triphosphide, making it suitable for technological applications. Building on
this, the electronic properties of van der Waals heterostructure constructed by
graphene (G) and the \bip~monolayer (m-\bip) were investigated. Our results
show that the Dirac cone in graphene remains intact in this heterostructure. At
the equilibrium interlayer distance, the G/m-BiP$_3$ forms an n-type contact
with a Schottky barrier height of 0.5 eV. It is worth noting that the SHB in
the G/m-BiP$_3$ heterostructure can be adjusted by changing the interlayer
distance or applying a transverse electric field. Thus, we show that few-layers
\bip~is an interesting material for realizing nanoelectronic and optoelectronic
devices and is an excellent option for designing Schottky nanoelectronic
devices.
The magnetic and structural properties of the recently discovered
pnictogen/chalcogen-free superconductor LaFeSiH ($T_c\simeq10$~K) have been
investigated by $^{57}$Fe synchrotron M{\"o}ssbauer source (SMS) spectroscopy,
x-ray and neutron powder diffraction and $^{29}$Si nuclear magnetic resonance
spectroscopy (NMR). No sign of long range magnetic order or local moments has
been detected in any of the measurements and LaFeSiH remains tetragonal down to
2 K. The activated temperature dependence of both the NMR Knight shift and the
relaxation rate $1/T_1$ is analogous to that observed in strongly overdoped
Fe-based superconductors. These results, together with the
temperature-independent NMR linewidth, show that LaFeSiH is an homogeneous
metal, far from any magnetic or nematic instability, and with similar Fermi
surface properties as strongly overdoped iron pnictides. This raises the
prospect of enhancing the $T_c$ of LaFeSiH by reducing its carrier
concentration through appropriate chemical substitutions. Additional SMS
spectroscopy measurements under hydrostatic pressure up to 18.8~GPa found no
measurable hyperfine field.
Upon film growth by physical vapor deposition, the preferential orientation
of polar organic molecules can result in a non-zero permanent dipole moment
(PDM) alignment, causing a macroscopic film polarization. This effect, known as
spontaneous orientation polarization (SOP), was studied in the case of
different phosphine oxides. We investigate the control of SOP by molecular
design and film-growth conditions. Our results show that using less polar
phosphine oxides with just one phosphor-oxygen bond yields an exceptionally
high degree of SOP with the so-called giant surface potential (slope) reaching
more than 150mV/nm in a neat BCPO film grown at room temperature. Additionally,
by altering the evaporation rate and the substrate temperature, we are able to
control the SOP magnitude over a broad range from 0 to almost 300mV/nm.
Diluting BCPO in a non-polar host enhances the PDM alignment only marginally,
but combining temperature control together with dipolar doping can result in
almost perfectly aligned molecules with more than 80% of their PDMs standing
upright on the substrate on average.
In this paper, we report the growth of pure {\alpha}-MoO3 micro-flakes by CVD
technique and their structural, electronic, optical, and magnetic properties.
Samples are annealed at various temperatures in an H2 atmosphere to induce
ferromagnetism. All the samples exhibit ferromagnetism at room temperature, and
250oC annealed sample shows the highest magnetic moment of 0.087 emu/g. It is
evident from PL data that pristine as well as annealed samples contain
different types of defects like oxygen vacancies, surface defects, interstitial
oxygen, etc. It is deduced from the analysis of Mo3d and O1s core-level XPS
spectra that oxygen vacancies increase up to an annealing temperature of 250oC
that correlates with the magnetic moment. Significant changes in the total
density of states and also in the magnetic moment for two and three oxygen
vacancies are noticed through first-principle-based calculations. It is
concluded that the magnetic moment is produced by oxygen vacancies or vacancy
clusters, which is consistent with our experimental findings.
Generative models offer a direct way to model complex data. Among them,
energy-based models provide us with a neural network model that aims to
accurately reproduce all statistical correlations observed in the data at the
level of the Boltzmann weight of the model. However, one challenge is to
understand the physical interpretation of such models. In this study, we
propose a simple solution by implementing a direct mapping between the energy
function of the Restricted Boltzmann Machine and an effective Ising spin
Hamiltonian that includes high-order interactions between spins. This mapping
includes interactions of all possible orders, going beyond the conventional
pairwise interactions typically considered in the inverse Ising approach, and
allowing the description of complex datasets. Earlier work attempted to achieve
this goal, but the proposed mappings did not do properly treat the complexity
of the problem or did not contain direct prescriptions for practical
application. To validate our method, we perform several controlled numerical
experiments where the training samples are equilibrium samples of predefined
models containing local external fields, two-body and three-body interactions
in various low-dimensional topologies. The results demonstrate the
effectiveness of our proposed approach in learning the correct interaction
network and pave the way for its application in modeling interesting datasets.
We also evaluate the quality of the inferred model based on different training
methods.
We report resonant second harmonic generation (SHG) spectroscopy of an
hBN-encapsulated monolayer of MoS$_2$. By tuning the energy of the excitation
laser, we identify a dark state transition (D) that is blue detuned by +25 meV
from the neutral exciton X$^0$. We observe a splitting of the SHG spectrum into
two distinct peaks and a clear anticrossing between them as the SHG resonance
is tuned through the energy of the dark exciton D. This observation is
indicative of quantum interference arising from the strong two-photon
light-matter interaction. We further probe the incoherent relaxation from the
dark state to the bright excitons, including X$^0$ and localized excitons LX,
by the resonant enhancement of their intensities at the SHG-D resonance. The
relaxation of D to bright excitons is strongly suppressed on the bare substrate
whilst enabled when the hBN/MoS$_2$/hBN heterostructure is integrated in a
nanobeam cavity. The relaxation enabled by the cavity is explained by the
phonon scattering enhanced by the cavity phononic effects. Our work reveals the
two-photon quantum interference with long-lived dark states and enables the
control through nanostructuring of the substrate. These results indicate the
great potential of dark excitons in 2D-material based nonlinear quantum
devices.
We reveal the connection between two-dimensional subsystem symmetry-protected
topological (SSPT) states and two-dimensional topological orders via a
self-dual frustrated toric code model. This model, an enrichment of the toric
code (TC) with its dual interactions, can be mapped to a model defined on the
dual lattice with subsystem symmetries and subextensive ground state
degeneracy. The map connects exactly the frustrated TC to two copies of the
topological plaquette Ising model (TPIM), as a strong SSPT model with linear
subsystem symmetries. The membrane order parameter of TPIM is exactly mapped to
dual TC stabilizers as the order parameter of the frustrated TC model, and the
transition between the SSPT-ordered TPIM to the trivial paramagnetic phase is
mapped to the transition between two distinct topological orders. We also
demonstrate that this picture of frustrated TC can be used to construct other
SSPT models, hinting at a subtle linkage between SSPT order and topological
order in two dimensions.
We present a simple Landau phenomenology for plastic-to-crystal phase
transitions and use the resulting model to calculate barocaloric effects in
plastic crystals that are driven by hydrostatic pressure. The essential
ingredients of the model are (i) a multipole-moment order parameter that
describes the orientational ordering of the constituent molecules, (ii)
coupling between such order parameter and elastic strains, and (iii) the
thermal expansion of the solid. The model captures main features of
plastic-to-crystal phase transitions, namely large volume and entropy changes
at the transition, and strong dependence of the transition temperature with
pressure. Using solid C$_{60}$ under $0.60\,$GPa as case example, we show that
calculated peak isothermal entropy changes of $\sim 58 \,{\rm J K^{-1}
kg^{-1}}$ and peak adiabatic entropy changes of $\sim 23 \,{\rm K}$ agree well
with experimental values.
A pivotal challenge in present quantum technologies lies in reconciling long
coherence times with efficient manipulation of the quantum states of a system.
Lanthanide atoms, with their well-localized 4f electrons, emerge as a promising
solution to this dilemma if provided with a rational design of the manipulation
and detection schemes. Here we utilize a scanning tunneling microscope to
construct tailored spin structures and perform electron spin resonance on a
single lanthanide atom in such a structure. A magnetically coupled structure
made of an Erbium and a Titanium atom at sub-nanometer distance enables us to
both drive Erbium's 4f electron spins and indirectly probe them through the
Titanium's 3d electrons. In this coupled configuration, the Erbium spin states
exhibit a four-fold increase in the spin relaxation time and a two-fold
increase in the driving efficiency compared to the 3d electron counterparts.
Our work provides a new approach to accessing highly protected spin states,
enabling us to control them in an all-electric fashion.
Altermagnets (AM) are a recently discovered third class of collinear magnets,
distinctly different from conventional ferromagnets (FM) and antiferromagnets
(AF). AM have been actively researched in the last few years, but two aspects
so far remain unaddressed: (1) Are there realistic 2D single-layer
altermagnets? And (2) is it possible to functionalize a conventional AF into AM
by external stimuli? In this paper we address both issues by demonstrating how
a well-known 2D AF, MnP(S,Se)$_3$ can be functionalized into strong AM by
applying out-of-plane electric field. Of particular interest is that the
induced altermagnetism is of a higher even-parity wave symmetry than expected
in 3D AM with similar crystal symmetries. We confirm our finding by
first-principles calculations of the electronic structure and magnetooptical
response. We also propose that recent observations of the time-reversal
symmetry breaking in the famous Fe-based superconducting chalchogenides, either
in monolayer form or in the surface layer, may be related not to an FM, as
previously assumed, but to the induced 2D AM order. Finally, we show that
monolayer FeSe can simultaneously exhibit unconventional altermagnetic
time-reversal symmetry breaking and quantized spin Hall conductivity indicating
possibility to research an intriquing interplay of 2D altermagnetism with
topological and superconducting states within a common crystal-potential
environment.
An essential aspect of extending safe operation of the active nuclear
reactors is understanding and predicting the embrittlement that occurs in the
steels that make up the Reactor pressure vessel (RPV). In this work we
integrate state of the art machine learning methods using ensembles of neural
networks with unprecedented data collection and integration to develop a new
model for RPV steel embrittlement. The new model has multiple improvements over
previous machine learning and hand-tuned efforts, including greater accuracy
(e.g., at high-fluence relevant for extending the life of present reactors),
wider domain of applicability (e.g., including a wide-range of compositions),
uncertainty quantification, and online accessibility for easy use by the
community. These improvements provide a model with significant new
capabilities, including the ability to easily and accurately explore
compositions, flux, and fluence effects on RPV steel embrittlement for the
first time. Furthermore, our detailed comparisons show our approach improves on
the leading American Society for Testing and Materials (ASTM) E900-15 standard
model for RPV embrittlement on every metric we assessed, demonstrating the
efficacy of machine learning approaches for this type of highly demanding
materials property prediction.
RhPb was initially recognized as one of a CoSn-like compounds with $P6/mmm$
symmetry, containing an ideal kagome lattice of $d$-block atoms. However,
theoretical calculations predict the realization of the phonon soft mode which
leads to the kagome lattice distortion and stabilization of the structure with
$P\bar{6}2m$ symmetry [A. Ptok et al., Phys. Rev. B 104, 054305 (2021)]. Here,
we present the single crystal x-ray diffraction results supporting this
prediction. Furthermore, we discuss the main dynamical properties of RhPb with
$P\bar{6}2m$ symmetry. The bulk phononic dispersion curves contain several
flattened bands, Dirac nodal lines, and triple degenerate Dirac points. As a
consequence, the phononic drumhead surface state is realized for the (100)
surface, terminated by the zigzag-like edge of Pb honeycomb sublattice.
We evaluate the sound attenuation in a Weyl semimetal subject to a magnetic
field or a pseudomagnetic field associated with a strain. Due to the interplay
of intra- and inter-node scattering processes as well as screening, the fields
generically reduce the sound absorption. A nontrivial dependence on the
relative direction of the magnetic field and the sound wave vector, i.e., the
magnetic sound dichroism, can occur in materials with nonsymmetric Weyl nodes
(e.g., different Fermi velocities and/or relaxation times). It is found that
the sound dichroism in Weyl materials can also be activated by an external
strain-induced pseudomagnetic field. In view of the dependence on the field
direction, the dichroism may lead to a weak enhancement of the sound
attenuation compared with its value at vanishing fields.
Ergodic theory provides a rigorous mathematical description of chaos in
classical dynamical systems, including a formal definition of the ergodic
hierarchy. How ergodic dynamics is reflected in the energy levels and
eigenstates of a quantum system is the central question of quantum chaos, but a
rigorous quantum notion of ergodicity remains elusive. Closely related to the
classical ergodic hierarchy is a less-known notion of cyclic approximate
periodic transformations [see, e.g., I. Cornfield, S. Fomin, and Y. Sinai,
Ergodic Theory (Springer-Verlag New York, 1982)], which maps any "ergodic"
dynamical system to a cyclic permutation on a circle and arguably represents
the most elementary form of ergodicity. This paper shows that cyclic ergodicity
generalizes to quantum dynamical systems, and provides a rigorous
observable-independent definition of quantum ergodicity. It implies the ability
to construct an orthonormal basis, where quantum dynamics transports any
initial basis vector to have a sufficiently large overlap with each of the
other basis vectors in a cyclic sequence. It is proven that the basis,
maximizing the overlap over all such quantum cyclic permutations, is obtained
via the discrete Fourier transform of the energy eigenstates. This relates
quantum cyclic ergodicity to energy level statistics. The level statistics of
Wigner-Dyson random matrices, usually associated with quantum chaos on
empirical grounds, is derived as a special case of this general relation. To
demonstrate generality, we prove that irrational flows on a 2D torus are
classical and quantum cyclic ergodic, with spectral rigidity distinct from
Wigner-Dyson. Finally, we motivate a quantum ergodic hierarchy of operators and
discuss connections to eigenstate thermalization. This work provides a general
framework for transplanting some rigorous concepts of ergodic theory to quantum
dynamical systems.
Non-Hermitian (NH) lattice Hamiltonians display a unique kind of energy gap
and extreme sensitivity to boundary conditions. Due to the NH skin effect, the
separation between edge and bulk states is blurred and the (conventional)
bulk-boundary correspondence is lost. Here, we restore the bulk-boundary
correspondence for the most paradigmatic class of NH Hamiltonians, namely those
with one complex band and without symmetries. We obtain the desired NH
Hamiltonian from the (mean-field) unconditional evolution of driven-dissipative
cavity arrays, in which NH terms -- in the form of non-reciprocal hopping
amplitudes, gain and loss -- are explicitly modeled via coupling to (engineered
and non-engineered) reservoirs. This approach removes the arbitrariness in the
definition of the topological invariant, as point-gapped spectra differing by a
complex-energy shift are not treated as equivalent; the origin of the complex
plane provides a common reference (base point) for the evaluation of the
topological invariant. This implies that topologically non-trivial Hamiltonians
are only a strict subset of those with a point gap and that the NH skin effect
does not have a topological origin. We analyze the NH Hamiltonians so obtained
via the singular value decomposition, which allows to express the NH
bulk-boundary correspondence in the following simple form: an integer value
$\nu$ of the topological invariant defined in the bulk corresponds to $\vert
\nu\vert$ singular vectors exponentially localized at the system edge under
open boundary conditions, in which the sign of $\nu$ determines which edge.
Non-trivial topology manifests as directional amplification of a coherent input
with gain exponential in system size. Our work solves an outstanding problem in
the theory of NH topological phases and opens up new avenues in topological
photonics.
Here, we reveal our recent progress on a geometrical approach of quantum
physics and topological crystals linking with Dirac magnetic monopoles and
gauge fields through classical electrodynamics. The Bloch sphere of a quantum
spin-1/2 particle acquires an integer topological charge in the presence of a
radial magnetic field. We show that global topological properties are encoded
from the poles of the surface allowing a correspondence between smooth fields,
metric and quantum distance with the square of the topological number. The
information is transported from each pole to the equatorial plane on a thin
Dirac string. We develop the theory, "quantum topometry" in space and time, and
present applications on transport from a Newtonian approach, on a quantized
photo-electric effect from circular dichroism of light towards topological band
structures of crystals. Edge modes related to topological lattice models are
resolved analytically when deforming the sphere or ellipse onto a cylinder.
Topological properties of the quantum Hall effect, quantum anomalous Hall
effect and quantum spin Hall effect on the honeycomb lattice can be measured
locally in the Brillouin zone from light-matter coupling. The formalism allows
us to include interaction effects from the momentum space. Interactions may
also result in fractional entangled geometry within the curved space. We
develop a relation between entangled wavefunction in quantum mechanics,
coherent superposition of geometries, a way to one-half topological numbers and
Majorana fermions. We show realizations in topological matter. We present a
link between axion electrodynamics, topological insulators on a surface of a
cube and the two-spheres' model via merons.
In non-interacting systems, bands from non-trivial topology emerge strictly
at half-filling and exhibit either the quantum anomalous Hall or spin Hall
effects. Here we show using determinantal quantum Monte Carlo and an exactly
solvable strongly interacting model that these topological states now shift to
quarter filling. A topological Mott insulator is the underlying cause. The peak
in the spin susceptibility is consistent with a possible ferromagnetic state at
$T=0$. The onset of such magnetism would convert the quantum spin Hall to a
quantum anomalous Hall effect. While such a symmetry-broken phase typically is
accompanied by a gap, we find that the interaction strength must exceed a
critical value for this to occur. Hence, we predict that topology can obtain in
a gapless phase but only in the presence of interactions in dispersive bands.
These results explain the recent quarter-filled quantum anomalous Hall effects
seen in moire systems.
We propose a new type of helical topological superconductivity away from the
Fermi surface in three-dimensional time-reversal-symmetric odd-parity multiband
superconductors. In these systems, pairing between electrons originating from
different bands is responsible for the corresponding topological phase
transition. Consequently, a pair of helical topological Dirac surface states
emerges at finite excitation energies. These helical Dirac surface states are
tunable in energy by chemical potential and strength of band-splitting. They
are protected by pseudospin rotation symmetry. We suggest concrete materials in
which this phenomenon could be observed.
The emergence of exotic quantum phenomena in frustrated magnets is rapidly
driving the development of quantum many-body physics, raising fundamental
questions on the nature of quantum phase transitions. Here we unveil the
behaviour of emergent symmetry involving two extraordinarily representative
phenomena, i.e., the deconfined quantum critical point (DQCP) and the quantum
spin liquid (QSL) state. Via large-scale tensor network simulations, we study a
spatially anisotropic spin-1/2 square-lattice frustrated antiferromagnetic
(AFM) model, namely the $J_{1x}$-$J_{1y}$-$J_2$ model, which contains
anisotropic nearest-neighbor couplings $J_{1x}$, $J_{1y}$ and the next nearest
neighbor coupling $J_2$. For small $J_{1y}/J_{1x}$, by tuning $J_2$, a direct
continuous transition between the AFM and valence bond solid phase is
observed.(Of course, the possibility of weakly first order transition can not
be fully excluded.) With growing $J_{1y}/J_{1x}$, a gapless QSL phase gradually
emerges between the AFM and VBS phases. We observe an emergent O(4) symmetry
along the AFM--VBS transition line, which is consistent with the prediction of
DQCP theory. Most surprisingly, we find that such an emergent O(4) symmetry
holds for the whole QSL--VBS transition line as well. These findings reveal the
intrinsic relationship between the QSL and DQCP from categorical symmetry point
of view, and strongly constrain the quantum field theory description of the QSL
phase. The phase diagram and critical exponents presented in this paper are of
direct relevance to future experiments on frustrated magnets and cold atom
systems.
One key challenge in the field of topological superconductivity (Tsc) has
been the rareness of material realization. This is true not only for the
first-order Tsc featuring Majorana surface modes, but also for the higher-order
Tsc, which host Majorana hinge and corner modes. Here, we propose a four-step
strategy that mathematically derives comprehensive guiding principles for the
search and design for materials of general higher-order Tsc phases.
Specifically, such recipes consist of conditions on the normal state and
pairing symmetry that can lead to a given higher-order Tsc state. We
demonstrate this strategy by obtaining recipes for achieving three-dimensional
higher-order Tsc phases protected by the inversion symmetry. Following our
recipe, we predict that the observed superconductivity in centrosymmetric
MoTe$_2$ is a candidate for higher-order Tsc with corner modes. Our proposed
strategy enables systematic materials search and design for higher-order Tsc,
which can mobilize the experimental efforts and accelerate the material
discovery for higher-order Tsc phases.
The Lorenz system was derived on the basis of a model of convective
atmospheric motions and may serve as a paradigmatic model for considering a
complex climate system. In this study, we formulated the thermodynamic
efficiency of convective atmospheric motions governed by the Lorenz system by
treating it as a non-equilibrium thermodynamic system. Based on the fluid
conservation equations under the Oberbeck-Boussinesq approximation,the work
necessary to maintain atmospheric motion and heat fluxes at the boundaries were
calculated. Using these calculations, the thermodynamic efficiency was
formulated for stationary and chaotic dynamics. The numerical results show
that, for both stationary and chaotic dynamics, the efficiency tends to
increase as the atmospheric motion is driven out of thermodynamic equilibrium
when the Rayleigh number increases. However, it is shown that the efficiency is
upper bounded by the maximum efficiency, which is expressed in terms of the
parameters characterizing the fluid and the convective system. The analysis of
the entropy generation rate was also performed for elucidating the difference
between the thermodynamic efficiency of conventional heat engines and the
present atmospheric heat engine. It is also found that there exists an abrupt
drop in efficiency at the critical Hopf bifurcation point, where the dynamics
change from stationary to chaotic. These properties are similar to those found
previously in Malkus-Lorenz waterwheel system.
We introduce and classify nonequivalent commensurate stackings for bilayer
dice or $\mathcal{T}_3$ lattice. For each of the four stackings with vertical
alignment of sites in two layers, a tight-binding model and an effective model
describing the properties in the vicinity of the threefold band-crossing points
are derived. Focusing on these band-crossing points, we found that although the
energy spectrum remains always gapless, depending on the stacking, different
types of quasiparticle spectra arise. They include those with flat, tilted,
anisotropic semi-Dirac, and $C_3$-corrugated energy bands. We use the derived
tight-binding models to calculate the density of states and the spectral
function. The corresponding results reveal drastic redistribution of the
spectral weight due to the inter-layer coupling that is unique for each of the
stackings.
Programmable quantum simulators such as superconducting quantum processors
and ultracold atomic lattices represent rapidly developing emergent technology
that may one day qualitatively outperform existing classical computers. Yet,
apart from a few breakthroughs, the range of viable computational applications
with current-day noisy intermediate-scale quantum (NISQ) devices is still
significantly limited by gate errors, quantum decoherence, and the number of
high-quality qubits. In this work, we develop an approach that places NISQ
hardware as a particularly suitable platform for simulating multi-dimensional
condensed matter systems, including lattices beyond three dimensions which are
difficult to realize or probe in other settings. By fully exploiting the
exponentially large Hilbert space of a quantum chain, we encoded a
high-dimensional model in terms of non-local many-body interactions that can
further be systematically transcribed into quantum gates. We demonstrate the
power of our approach by realizing, on IBM transmon-based quantum computers,
higher-order topological states in up to four dimensions, which are exotic
phases that have never been realized in any quantum setting. With the aid of
in-house circuit compression and error mitigation techniques, we measured the
topological state dynamics and their protected mid-gap spectra to a high degree
of accuracy, as benchmarked by reference exact diagonalization data. The time
and memory needed with our approach scale favorably with system size and
dimensionality compared to exact diagonalization on classical computers.
One-dimensional Floquet topological superconductors possess two types of
degenerate Majorana edge modes at zero and $\pi$ quasieneriges, leaving more
room for the design of boundary time crystals and quantum computing schemes
than their static counterparts. In this work, we discover Floquet
superconducting phases with large topological invariants and arbitrarily many
Majorana edge modes in periodically driven Kitaev chains. Topological winding
numbers defined for the Floquet operator and Floquet entanglement Hamiltonian
are found to generate consistent predictions about the phase diagram, bulk-edge
correspondence and numbers of zero and $\pi$ Majorana edge modes of the system
under different driving protocols. The bipartite entanglement entropy further
show non-analytic behaviors around the topological transition point between
different Floquet superconducting phases. These general features are
demonstrated by investigating the Kitaev chain with periodically kicked pairing
or hopping amplitudes. Our discovery reveals the rich topological phases and
many Majorana edge modes that could be brought about by periodic driving fields
in one-dimensional superconducting systems. It further introduces a unified
description for a class of Floquet topological superconductors from their
quasienergy bands and entanglement properties.
We calculate optical conductivity for bilayer dice lattices in commensurate
vertically aligned stackings. The interband optical conductivity reveals a rich
activation behavior unique for each of the four stackings. We found that the
intermediate energy band, which corresponds to the flat band of a single-layer
dice lattice, plays a different role for different stackings. The interband
selection rules, which are crucial for the single-layer lattice, may become
lifted in bilayer lattices. The results for effective and tight-binding models
are found to be in qualitative agreement for some of the stackings and the
reasons for the discrepancies for others are identified. Our findings propose
optical conductivity as an effective tool to distinguish between different
stackings in bilayer dice lattices.
We study a novel class of Renormalization Group flows which connect
multicritical versions of the two-dimensional Yang-Lee edge singularity
described by the conformal minimal models M(2,2n+3). The absence in these
models of an order parameter implies that the flows towards and between
Lee-Yang edge singularities are all related to the spontaneous breaking of PT
symmetry and comprise a pattern of flows in the space of PT symmetric theories
consistent with the c-theorem and the counting of relevant directions.
Additionally, we find that while in a part of the phase diagram the domains of
unbroken and broken PT symmetry are separated by critical manifolds of class
M(2,2n+3), other parts of the boundary between the two domains are not
critical.
Motivated by topological equivalence between an extended Haldane model and a
chiral-$\pi$-flux model on a square lattice, we apply $\pi$-flux models to
two-dimensional bipartite quasicrystals with rhombus tiles in order to
investigate topological properties in aperiodic systems. Topologically trivial
$\pi$-flux models in the Ammann-Beenker tiling lead to massively degenerate
confined states whose energies and fractions differ from the zero-flux model.
This is different from the $\pi$-flux models in the Penrose tiling, where
confined states only appear at the center of the bands as is the case of a
zero-flux model. Additionally, Dirac cones appear in a certain $\pi$-flux model
of the Ammann-Beenker approximant, which remains even if the size of the
approximant increases. Nontrivial topological states with nonzero Bott index
are found when staggered tile-dependent hoppings are introduced in the
$\pi$-flux models. This finding suggests a new direction in realizing
nontrivial topological states without a uniform magnetic field in aperiodic
systems.
Fluidity, the ability of liquids to flow, is the key property distinguishing
liquids from solids. This fluidity is set by the mobile transit atoms moving
from one quasi-equilibrium point to the next. The nature of this transit motion
is unknown. Here, we show that flow-enabling transits form a dynamically
distinct sub-ensemble where atoms move on average faster than the overall
system, with a manifestly non-Maxwellian velocity distribution. This is in
contrast to solids and gases where no distinction of different ensembles can be
made and where the distribution is always Maxwellian. The non-Maxwellian
distribution is described by an exponent $\alpha$ corresponding to high
dimensionality of space. This is generally similar to extra synthetic
dimensions in topological quantum matter, albeit higher dimensionality in
liquids is not integer but is fractional. The dimensionality is close to 4 at
melting and exceeds 4 at high temperature. $\alpha$ has a maximum as a function
of temperature and pressure in liquid and supercritical states, returning to
its Maxwell value in the solid and gas states.
Quantum phase transitions between different topologically ordered phases
exhibit rich structures and are generically challenging to study in microscopic
lattice models. In this work, we propose a tensor-network solvable model that
allows us to tune between different symmetry enriched topological (SET) phases.
Concretely, we consider a decorated two-dimensional toric code model for which
the ground state can be expressed as a two-dimensional tensor-network state
with bond dimension $D=3$ and two tunable parameters. We find that the
time-reversal (TR) symmetric system exhibits three distinct phases (i) an SET
toric code phase in which anyons transform non-trivially under TR, (ii) a toric
code phase in which TR does not fractionalize, and (iii) a topologically
trivial phase that is adiabatically connected to a product state. We
characterize the different phases using the topological entanglement entropy
and a membrane order parameter that distinguishes the two SET phases. Along the
phase boundary between the SET toric code phase and the toric code phase, the
model has an enhanced $U(1)$ symmetry and the ground state is a quantum
critical loop gas wavefunction whose squared norm is equivalent to the
partition function of the classical $O(2)$ model. By duality transformations,
this tensor-network solvable model can also be used to describe transitions
between SET double-semion phases and between $\mathbb{Z}_2\times\mathbb{Z}_2^T$
symmetry protected topological phases in two dimensions.
The conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) is one of the
most researched materials. The 1980s bipolaron model remains the dominant
interpretation of the electronic structure of PEDOT. Recent theoretical studies
have provided updated definitions of key concepts such as bipolarons or polaron
pairs, but these have not yet become widely known. In this work, we use density
functional theory to investigate the electronic structure of PEDOT oligomers,
with and without co-located AlCl4- anions. By considering the influence of
oligomer length, oxidation or anion concentration and spin state, we find no
evidence for self-localisation of positive charges in PEDOT as predicted by the
bipolaron model at the hybrid functional level. Our results show distortions
that exhibit either a single or a double peak in bond length alternations and
charge density. Either can occur at any oxidation or anion concentration. We
note that other distortion shapes are also possible. Rather than representing
bipolarons or polaron pairs in the original model, these are electron
distributions driven by a range of factors. Localisation of distortions does
occur with anions, and distortions can span an arbitrary number of nearby
anions. Conductivity in conducting polymers has been observed to reduce at
anion concentrations above 0.5. We show at high anion concentrations, the
energy of the localised, non-bonding anionic orbitals approaches that of the
system HOMO due to Coulombic repulsion between anions. We hypothesize that with
nucleic motion in the macropolymer, these orbitals will interfere with the
hopping of charge carriers between sites of similar energy, lowering
conductivity.
While a parent Hamiltonian for Laughlin $1/3$ wave function has been long
known in terms of the Haldane pseudopotentials, no parent Hamiltonians are
known for the lowest-Landau-level projected wave functions of the composite
fermion theory at $n/(2n+1)$ with $n\geq2$. If one takes the two lowest Landau
levels to be degenerate, the Trugman-Kivelson interaction produces the
unprojected 2/5 wave function as the unique zero energy solution. If the lowest
three Landau levels are assumed to be degenerate, the Trugman-Kivelson
interaction produces a large number of zero energy states at $\nu=3/7$. We
propose that adding an appropriately constructed three-body interaction yields
the unprojected $3/7$ wave function as the unique zero energy solution, and
report extensive exact diagonalization studies that provide strong support to
this proposal.
Motivated by the recent studies of intrinsic local moments and Kondo-driven
phases in magic-angle twisted bilayer graphene, we investigate the
renormalization of Kondo coupling ($J_K$) and the competing Hund's rule
interaction ($J$) in the low-energy limit. Specifically, we consider a
surrogate single-impurity generalized Kondo model and employ the poor man's
scaling approach. The scale-dependent $J_K$ and $J$ are derived analytically
within the one-loop poor man's scaling approach, and the Kondo temperature
($T_K$) and the characteristic Hund's rule coupling ($J^*$, defined by the
renormalized value of $J$ at some small finite energy scale) are estimated over
a wide range of filling factors. We find that $T_K$ depends strongly on the
filling factors as well as the value of $J_K$. Slightly doping away from
integer fillings and/or increasing $J_K$ may substantially enhance $T_K$ in the
parameter regime relevant to experiments. $J^*$ is always reduced from the bare
value of $J$, but the filling factor dependence is not as significant as it is
for $T_K$. Our results suggest that it is essential to incorporate the
renormalization of $J_K$ and $J$ in the many-body calculations, and Kondo
screening should occur for a wide range of fractional fillings in magic-angle
twisted bilayer graphene, implying the existence of Kondo-driven correlated
metallic phases. We also point out that the observation of distinct phases at
integer fillings in different samples may be due to the variation of $J_K$ in
addition to disorder and strain in the experiments.
We present a novel theoretical approach to incorporate electronic
interactions in the study of two-dimensional topological insulators. By
exploiting the correspondence between edge state physics and entanglement
spectrum in gapped topological systems, we deconstruct the system into
one-dimensional channels. This framework enables a simple and elegant inclusion
of fermionic interactions into the discussion of topological insulators. We
apply this approach to the Kane-Mele model with interactions and magnetic
impurities.
In this paper, the electronic structure and bond properties of MoSS$_2$,
MoSeS$_2$ and MoTeS$_2$ are studied. Density functional theory (DFT) calculates
combined with the binding energy and bond-charge (BBC) model to obtain
electronic structure, binding energy shift and bond properties. It is found
that electrostatic shielding by electron exchange is the main cause of density
fluctuation. A method for calculating the density of Green's function with
energy level shift is established. It provides new methods and ideas for the
further study of the binding energy, bond states and electronic properties of
nanomaterials.
Scattering dynamics influence the graphenes transport properties and inhibits
the charge carrier deterministic behaviour. The intra or inter-band scattering
mechanisms are vital for graphenes optical conductivity response under specific
considerations of doping. Here, we investigated the influence of scattering
systematically on optical conductivity using a semi-classical multiband
Boltzmann equation with inclusion of both electron-electron $\&$
electron-phonon collisions. We found unconventional characteristics of linear
optical response with a significant deviation from the universal conductivity
$\frac{e$^2$}{2$\hbar$}$ in doped monolayer graphene. This is explained through
phenomenological relaxation rates under low doping regime with dominant
intraband scattering. Such novel optical responses are vanished at high
temperatures or overdoping conditions due to strong Drude behaviour. With the
aid of approximations around Dirac points we have developed analytical
formalism for many body interactions and is in good agreement with the Kubo
approaches.
In our previous work, we synthesized a metal/2D material heterointerface
consisting of $L1_0$-ordered iron-palladium (FePd) and graphene (Gr) called
FePd(001)/Gr. This system has been explored by both experimental measurements
and theoretical calculations. In this study, we focus on a heterojunction
composed of FePd and multilayer graphene referred to as
FePd(001)/$m$-Gr/FePd(001), where $m$ represents the number of graphene layers.
We perform first-principles calculations to predict their spin-dependent
transport properties. The quantitative calculations of spin-resolved
conductance and magnetoresistance (MR) ratio (150-200%) suggest that the
proposed structure can function as a magnetic tunnel junction in spintronics
applications. We also find that an increase in $m$ not only reduces conductance
but also changes transport properties from the tunneling behavior to the
graphite $\pi$-band-like behavior. Furthermore, we examine the impact of
lateral displacements (sliding) at the interface and find that the spin
transport properties remain robust despite these changes; this is the advantage
of two-dimensional material hetero-interfaces over traditional insulating
barrier layers such as MgO.
Topological insulators have been extended to higher-order versions that
possess topological hinge or corner states in lower dimensions. However, their
robustness against disorder is still unclear. Here, we theoretically
investigate the phase transitions of three-dimensional (3D) chiral second-order
topological insulator (SOTI) in the presence of disorders. Our results show
that, by increasing disorder strength, the nonzero densities of states of side
surface and bulk emerge at critical disorder strengths of $W_{S}$ and $W_{B}$,
respectively. The spectral function indicates that the bulk gap is only closed
at one of the $R_{4z}\mathcal{T}$-invariant points, i.e., $\Gamma_{3}$. The
closing of side surface gap or bulk gap is ascribed to the significant decrease
of the elastic mean free time of quasi-particles. Because of the localization
of side surface states, we find that the 3D chiral SOTI is robust at an
averaged quantized conductance of $2e^{2}/h$ with disorder strength up to
$W_{B}$. When the disorder strength is beyond $W_{B}$, the 3D chiral SOTI is
then successively driven into two phases, i.e., diffusive metallic phase and
Anderson insulating phase. Furthermore, an averaged conductance plateau of
$e^{2}/h$ emerges in the diffusive metallic phase.
Investigating the interplay of dualities, generalized symmetries, and
topological defects beyond theoretical models is an important challenge in
condensed matter physics and quantum materials. A simple model exhibiting this
physics is the transverse-field Ising model, which can host a noninvertible
topological defect that performs the Kramers-Wannier duality transformation.
When acting on one point in space, this duality defect imposes the duality
twisted boundary condition and binds a single Majorana zero mode. This Majorana
zero mode is unusual as it lacks localized partners and has an infinite
lifetime, even in finite systems. Using Floquet driving of a closed Ising chain
with a duality defect, we generate this Majorana zero mode in a digital quantum
computer. We detect the mode by measuring its associated persistent
autocorrelation function using an efficient sampling protocol and a compound
strategy for error mitigation. We also show that the Majorana zero mode resides
at the domain wall between two regions related by a Kramers-Wannier duality.
Finally, we highlight the robustness of the isolated Majorana zero mode to
integrability and symmetry-breaking perturbations. Our findings offer an
approach to investigating exotic topological defects in digitized quantum
devices.
In recent years a consensus has gradually been reached that the previously
proposed deconfined quantum critical point (DQCP) for spin-1/2 systems, an
archetypal example of quantum phase transition beyond the classic Landau's
paradigm, actually does not correspond to a true unitary conformal field theory
(CFT). In this work we carefully investigate another type of quantum phase
transition supposedly beyond the similar classic paradigm, the so called
``symmetric mass generation" (SMG) transition proposed in recent years. We
employ the sharp diagnosis including the scaling of disorder operator and
R\'enyi entanglement entropy in large-scale lattice model quantum Monte Carlo
simulations. Our results strongly suggest that the SMG transition is indeed an
unconventional quantum phase transition and it should correspond to a true
$(2+1)d$ unitary CFT.
In a recent publication [Wurdack et al., Nat. Comm. 14:1026 (2023)], it was
shown that in microcavities containing atomically thin semiconductors
non-Hermitian quantum mechanics can lead to negative exciton polariton masses.
We show that mass-sign reversal can occur generally in radiative resonances in
two dimensions (without cavity) and derive conditions for it (critical
dephasing threshold etc.). In monolayer transition-metal dichalcogenides, this
phenomenon is not invalidated by the strong electron-hole exchange interaction,
which is known to make the exciton massless.
III-nitride wide bandgap semiconductors exhibit large exciton binding
energies, preserving strong excitonic effects at room temperature. On the other
hand, semiconducting two-dimensional (2D) materials, including MoS$_2$, also
exhibit strong excitonic effects, attributed to enhanced Coulomb interactions.
This study investigates excitonic interactions between surface GaN quantum well
(QW) and 2D MoS$_2$ in van der Waals heterostructures by varying the spacing
between these two excitonic systems. Optical property investigation first
demonstrates the effective passivation of defect states at the GaN surface
through MoS$_2$ coating. Furthermore, a strong interplay is observed between
MoS$_2$ monolayers and GaN QW excitonic transitions. This highlights the
interest of the 2D material/III-nitride QW system to study near-field
interactions, such as F\"orster resonance energy transfer, which could open up
novel optoelectronic devices based on such hybrid excitonic structures.
We present a simple proof of a sufficient condition for the uniqueness of
non-equilibrium steady states of Gorini-Kossakowski-Sudarshan-Lindblad
equations. We demonstrate the applications of the sufficient condition using
examples of the transverse-field Ising model, the XYZ model, and the
tight-binding model with dephasing.

Date of feed: Wed, 06 Sep 2023 00:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Speeding-up Hybrid Functional based Ab Initio Molecular Dynamics using Multiple Time-stepping and Resonance Free Thermostat. (arXiv:2309.00651v1 [physics.chem-ph])**

Ritama Kar, Sagarmoy Mandal, Vaishali Thakkur, Bernd Meyer, Nisanth N. Nair

**Quantum-Geometric Origin of Stacking Ferroelectricity. (arXiv:2309.00728v1 [cond-mat.mtrl-sci])**

Benjamin T. Zhou, Vedangi Pathak, Marcel Franz

**Microscopic scale of quantum phase transitions: from doped semiconductors to spin chains, cold gases and moir\'e superlattices. (arXiv:2309.00749v1 [cond-mat.str-el])**

Andrey Rogachev

**Quantum phase transitions in quantum Hall and other topological systems: role of the Planckian time. (arXiv:2309.00750v1 [cond-mat.str-el])**

Andrey Rogachev

**Magic momenta and three dimensional Landau levels from a three dimensional graphite moir\'e superlattice. (arXiv:2309.00825v1 [cond-mat.mes-hall])**

Xin Lu, Bo Xie, Yue Yang, Xiao Kong, Jun Li, Feng Ding, Zhu-Jun Wang, Jianpeng Liu

**Room-Temperature Anomalous Hall Effect in Graphene in Interfacial Magnetic Proximity with EuO Grown by Topotactic Reduction. (arXiv:2309.00892v1 [cond-mat.mtrl-sci])**

Satakshi Pandey, Simon Hettler, Raul Arenal, Corinne Bouillet, Aditi Raman Moghe, Stephane Berciaud, Jerome Robert, Jean Francois Dayen, David Halley

**Out-of-plane spin-to-charge conversion at low temperatures in graphene/MoTe$_2$ heterostructures. (arXiv:2309.00984v1 [cond-mat.mes-hall])**

Nerea Ontoso, C.K. Safeer, Josep Ingla-Aynés, Franz Herling, Luis E. Hueso, M. Reyes Calvo, Fèlix Casanova

**Size effects on atomic collapse in the dice lattice. (arXiv:2309.01023v1 [cond-mat.str-el])**

D. O. Oriekhov, S. O. Voronov

**"Extraordinary" Phase Transition Revealed in a van der Waals Antiferromagnet. (arXiv:2309.01047v1 [cond-mat.mtrl-sci])**

Xiaoyu Guo, Wenhao Liu, Jonathan Schwartz, Suk Hyun Sung, Dechen Zhang, Makoto Shimizu, Aswin L. N. Kondusamy, Lu Li, Kai Sun, Hui Deng, Harald O. Jeschke, Igor I. Mazin, Robert Hovden, Bing Lv, Liuyan Zhao

**Orbital-Dependent Electron Correlation in Double-Layer Nickelate La3Ni2O7. (arXiv:2309.01148v1 [cond-mat.supr-con])**

Jiangang Yang, Hualei Sun, Xunwu Hu, Yuyang Xie, Taimin Miao, Hailan Luo, Hao Chen, Bo Liang, Wenpei Zhu, Gexing Qu, Cui-Qun Chen, Mengwu Huo, Yaobo Huang, Shenjin Zhang, Fengfeng Zhang, Feng Yang, Zhimin Wang, Qinjun Peng, Hanqing Mao, Guodong Liu, Zuyan Xu, Tian Qian, Dao-Xin Yao, Meng Wang, Lin Zhao, X. J. Zhou

**Generalized Majorana edge modes in a number-conserving periodically driven $p$-wave superconductor. (arXiv:2309.01163v1 [cond-mat.mes-hall])**

Raditya Weda Bomantara

**Observation of multiple flat bands and topological Dirac states in a new titanium based slightly distorted kagome metal YbTi3Bi4. (arXiv:2309.01176v1 [cond-mat.mes-hall])**

Anup Pradhan Sakhya, Brenden R. Ortiz, Barun Ghosh, Milo Sprague, Mazharul Islam Mondal, Matthew Matzelle, Iftakhar Bin Elius, Nathan Valadez, David G. Mandrus, Arun Bansil, Madhab Neupane

**Direct visualization of electric current induced dipoles of atomic impurities. (arXiv:2309.01182v1 [cond-mat.mes-hall])**

Yaowu Liu, Zichun Zhang, Sidan Chen, Shengnan Xu, Lichen Ji, Wei Chen, Xinyu Zhou, Jiaxin Luo, Xiaopen Hu, Wenhui Duan, Xi Chen, Qi-Kun Xue, Shuai-Hua Ji

**The role of pressure-induced stacking faults on the magnetic properties of gadolinium. (arXiv:2309.01285v1 [cond-mat.mtrl-sci])**

Rafael Martinho Vieira, Olle Eriksson, Torbjörn Björkman, Ondřej Šipr, Heike C. Herper

**Steering-induced phase transition in measurement-only quantum circuits. (arXiv:2309.01315v1 [quant-ph])**

Dongheng Qian, Jing Wang

**From orthogonal link to phase vortex in generalized dynamical Hopf insulators. (arXiv:2309.01344v1 [cond-mat.str-el])**

Yuxuan Ma, Xin Li, Yu Wang, Shuncai Zhao, Guangqin Xiong, Tongxin Sun

**Piezoelectric Electrostatic Superlattices in Monolayer MoS$_2$. (arXiv:2309.01347v1 [cond-mat.mtrl-sci])**

Ashwin Ramasubramaniam, Doron Naveh

**Classification of Lifshitz invariant in multiband superconductors: an application to Leggett modes in the linear response regime in Kagome lattice models. (arXiv:2309.01410v1 [cond-mat.supr-con])**

Raigo Nagashima, Sida Tian, Rafael Haenel, Naoto Tsuji, Dirk Manske

**One-dimensional topological channels in heterostrained bilayer graphene. (arXiv:2309.01467v1 [cond-mat.mes-hall])**

Nina C. Georgoulea, Nuala M. Caffrey, Stephen R. Power

**Acoustic realization of projective mirror Chern insulators. (arXiv:2309.01484v1 [cond-mat.mes-hall])**

Tianzi Li, Luohong Liu, Qicheng Zhang, Chunyin Qiu

**Engineering rich two-dimensional higher-order topological phases by flux and periodic driving. (arXiv:2309.01499v1 [cond-mat.mes-hall])**

Ming-Jian Gao, Jun-Hong An

**Sublimation of silicene and thin silicon films: a view from molecular dynamics simulation. (arXiv:2309.01521v1 [cond-mat.mtrl-sci])**

Yu. D. Fomin, E. N. Tsiok, V. N. Ryzhov

**Giant ultra-broadband photoconductivity in twisted graphene heterostructures. (arXiv:2309.01555v1 [cond-mat.mes-hall])**

Hitesh Agarwal, Krystian Nowakowski, Andres Forrer, Alessandro Principi, Riccardo Bertini, Sergi Batlle-Porro, Antoine Reserbat-Plantey, Parmeshwar Prasad, Lorenzo Vistoli, Kenji Watanabe, Takashi Taniguchi, Adrian Bachtold, Giacomo Scalari, Roshan Krishna Kumar, Frank H.L. Koppens

**On the self-consistent Landauer-B\"uttikker formalism. (arXiv:2309.01564v1 [math-ph])**

Horia D. Cornean, Giovanna Marcelli

**Layer Construction of Three-Dimensional Z2 Monopole Charge Nodal Line Semimetals and prediction of the abundant candidate materials. (arXiv:2309.01566v1 [cond-mat.mtrl-sci])**

Yongpan Li, Shifeng Qian, Cheng-Cheng Liu

**Direct observation of topological surface states in the layered kagome lattice with broken time-reversal symmetry. (arXiv:2309.01579v1 [cond-mat.str-el])**

Zhicheng Jiang, Tongrui Li, Jian Yuan, Zhengtai Liu, Zhipeng Cao, Soohyun Cho, Mingfang Shu, Yichen Yang, Jianyang Ding, Zhikai Li, Jiayu Liu, Zhonghao Liu, Jishan Liu, Jie Ma, Zhe Sun, Yanfeng Guo, Dawei Shen

**Exchange spin-orbit coupling and unconventional p-wave magnetism. (arXiv:2309.01607v1 [cond-mat.mes-hall])**

Anna Birk Hellenes, Tomáš Jungwirth, Jairo Sinova, Libor Šmejkal

**Kinkless electronic junction along one dimensional electronic channel. (arXiv:2309.01648v1 [cond-mat.str-el])**

Qirong Yao, Jae Whan Park, Choongjae Won, Sang-Wook Cheong, Han Woong Yeom

**Nonequilibrium capillary self-assembly. (arXiv:2309.01668v1 [cond-mat.soft])**

Stuart J. Thomson, Jack-William Barotta, Daniel M. Harris

**Flat-band and multi-dimensional fermions in Pb10(PO4)6O4. (arXiv:2309.01755v1 [cond-mat.mtrl-sci])**

Botao Fu, Qin He, Xiao-Ping Li

**Impact of electrostatic crosstalk on spin qubits in dense CMOS quantum dot arrays. (arXiv:2309.01849v1 [cond-mat.mes-hall])**

Jesus D. Cifuentes, Tuomo Tanttu, Paul Steinacker, Santiago Serrano, Ingvild Hansen, James P. Slack-Smith, Will Gilbert, Jonathan Y. Huang, Ensar Vahapoglu, Ross C. C. Leon, Nard Dumoulin Stuyck, Kohei Itoh, Nikolay Abrosimov, Hans-Joachim Pohl, Michael Thewalt, Arne Laucht, Chih Hwan Yang, Christopher C. Escott, Fay E. Hudson, Wee Han Lim, Rajib Rahman, Andrew S. Dzurak, Andre Saraiva

**Andreev reflection of quantum Hall states through a quantum point contact. (arXiv:2309.01856v1 [cond-mat.mes-hall])**

Mehdi Hatefipour, Joseph J. Cuozzo, Enrico Rossi, Javad Shabani

**Control of Mechanical and Fracture Properties in Two-phase Materials Reinforced by Continuous, Irregular Networks. (arXiv:2309.01888v1 [cond-mat.mtrl-sci])**

Tommaso Magrini, Chelsea Fox, Adeline Wihardja, Athena Kolli, Chiara Daraio

**Para-fusion Category and Topological Defect Lines in $\mathbb Z_N$-parafermionic CFTs. (arXiv:2309.01914v1 [hep-th])**

Jin Chen, Babak Haghighat, Qing-Rui Wang

**Cavity-induced topological edge and corner states. (arXiv:2309.01927v1 [cond-mat.mes-hall])**

Motohiko Ezawa

**Na-catalyzed rapid synthesis and characterization of intercalated graphite CaC6. (arXiv:2309.01942v1 [cond-mat.mtrl-sci])**

Akira Iyo (1), Hiroshi Fujihisa (1), Yoshito Gotoh (1), Shigeyuki Ishida (1), Hiroshi Eisaki (1), Hiraku Ogino (1), Kenji Kawashima (1 and 2) ((1) National Institute of Advanced Industrial Science and Technology (AIST) (2) IMRA JAPAN Co., Ltd)

**Rapid droplet leads the Liquid-Infused Slippery Surfaces more slippery. (arXiv:2309.02038v1 [physics.flu-dyn])**

Kun Li, Cunjing Lv, Xi-Qiao Feng

**Superconductivity from spin fluctuations and long-range interactions in magic-angle twisted bilayer graphene. (arXiv:2309.02178v1 [cond-mat.mes-hall])**

Lauro B. Braz, George B. Martins, Luis G.G.V. Dias da Silva

**On the origin of circular dichroism in angular resolved photoemission from graphene, graphite, and WSe$_2$ family of materials. (arXiv:2309.02187v1 [cond-mat.mtrl-sci])**

Lukasz Plucinski

**Space charge and screening of a supercritical impurity cluster in monolayer graphene. (arXiv:2309.02199v1 [cond-mat.mes-hall])**

Eugene B. Kolomeisky, Joseph P. Straley

**Unveiling the electronic properties of BiP$_3$ triphosphide from bulk to heterostructures by first principles calculations. (arXiv:2309.02216v1 [cond-mat.mtrl-sci])**

Dominike P. de Andrade Deus, Igor S. S. de Oliveira, Roberto Hiroki Miwa, Erika L. Nascimento

**Magnetic and structural properties of the iron silicide superconductor LaFeSiH. (arXiv:2309.02241v1 [cond-mat.supr-con])**

M. F. Hansen, S. Layek, J.-B. Vaney, L. Chaix, M. R. Suchomel, M. Mikolasek, G. Garbarino, A. Chumakov, R. Rüffer, V. Nassif, T. Hansen, E. Elkaim, T. Pelletier, H. Mayaffre, F. Bernardini, A. Sulpice, M. Núñez-Regueiro, P. Rodière, A. Cano, S. Tencé, P. Toulemonde, M.-H. Julien, M. d'Astuto

**Controlling Spontaneous Orientation Polarization in Organic Semiconductors -- The Case of Phosphine Oxides. (arXiv:2309.02261v1 [cond-mat.mtrl-sci])**

Albin Cakaj, Markus Schmid, Alexander Hofmann, Wolfgang Brütting

**Probing defect induced room temperature ferromagnetism in CVD grown MoO3 flakes: A correlation with electronic structure and first principle-based calculations. (arXiv:2309.02277v1 [cond-mat.mtrl-sci])**

Sharmistha Dey, Vikash Mishra, Neetesh Dhakar, Sunil Kumar, Pankaj Srivastava, Santanu Ghosh

**Inferring effective couplings with Restricted Boltzmann Machines. (arXiv:2309.02292v1 [cond-mat.dis-nn])**

Aurélien Decelle, Cyril Furtlehner, Alfonso De Jesus Navas Gómez, Beatriz Seoane

**Probing the Dark Exciton in Monolayer MoS$_2$ by Quantum Interference in Second Harmonic Generation Spectroscopy. (arXiv:2309.02303v1 [cond-mat.mes-hall])**

Chenjiang Qian, Viviana Villafañe, Pedro Soubelet, Peirui Ji, Andreas V. Stier, Jonathan J. Finley

**Hidden subsystem symmetry protected states in competing topological orders. (arXiv:2309.02307v1 [cond-mat.str-el])**

Shi Feng

**Landau Theory of Barocaloric Plastic Crystals. (arXiv:2309.02316v1 [cond-mat.mtrl-sci])**

Marín-Delgado R., Moya, X., Guzmán-Verri, G. G

**Electrically Driven Spin Resonance of 4f Electrons in a Single Atom on a Surface. (arXiv:2309.02348v1 [cond-mat.mes-hall])**

Stefano Reale, Jiyoon Hwang, Jeongmin Oh, Harald Brune, Andreas J. Heinrich, Fabio Donati, Yujeong Bae

**Induced Monolayer Altermagnetism in MnP(S,Se)$_3$ and FeSe. (arXiv:2309.02355v1 [cond-mat.mes-hall])**

Igor Mazin, Rafael González-Hernández, Libor Šmejkal

**Predictions and Uncertainty Estimates of Reactor Pressure Vessel Steel Embrittlement Using Machine Learning. (arXiv:2309.02362v1 [cond-mat.mtrl-sci])**

Ryan Jacobs, Takuya Yamamoto, G. Robert Odette, Dane Morgan

**Phononic drumhead surface state in distorted kagome compound RhPb. (arXiv:2309.02419v1 [cond-mat.mtrl-sci])**

Andrzej Ptok, William R. Meier, Aksel Kobiałka, Surajit Basak, Małgorzata Sternik, Jan Łażewski, Paweł T. Jochym, Michael A. McGuire, Brian C. Sales, Hu Miao, Przemysław Piekarz, Andrzej M. Oleś

**Anomalous sound attenuation in Weyl semimetals in magnetic and pseudomagnetic fields. (arXiv:2102.04510v3 [cond-mat.mes-hall] UPDATED)**

P. O. Sukhachov, L. I. Glazman

**Dynamical quantum ergodicity from energy level statistics. (arXiv:2205.05704v3 [quant-ph] UPDATED)**

Amit Vikram, Victor Galitski

**Restoration of the non-Hermitian bulk-boundary correspondence via topological amplification. (arXiv:2207.12427v4 [quant-ph] UPDATED)**

Matteo Brunelli, Clara C. Wanjura, Andreas Nunnenkamp

**Topological Matter and Fractional Entangled Quantum Geometry through Light. (arXiv:2209.15381v5 [cond-mat.mes-hall] UPDATED)**

Karyn Le Hur

**1/4 is the new 1/2 when topology is intertwined with Mottness. (arXiv:2210.11486v5 [cond-mat.mes-hall] UPDATED)**

Peizhi Mai, Jinchao Zhao, Benjamin E. Feldman, Philip W. Phillips

**New type of helical topological superconducting pairing at finite excitation energies. (arXiv:2210.11955v3 [cond-mat.mes-hall] UPDATED)**

Masoud Bahari, Song-Bo Zhang, Chang-An Li, Sang-Jun Choi, Carsten Timm, Björn Trauzettel

**Emergent Symmetry in Quantum Phase Transitions: From Deconfined Quantum Critical Point to Gapless Quantum Spin Liquid. (arXiv:2212.00707v2 [cond-mat.str-el] UPDATED)**

Wen-Yuan Liu, Shou-Shu Gong, Wei-Qiang Chen, Zheng-Cheng Gu

**Higher-order topological superconductivity in a topological metal 1T$^\prime$-MoTe$_2$. (arXiv:2212.06197v3 [cond-mat.supr-con] UPDATED)**

Sheng-Jie Huang, Kyungwha Park, Yi-Ting Hsu

**Thermodynamic efficiency of atmospheric motion governed by Lorenz system. (arXiv:2302.03887v3 [nlin.CD] UPDATED)**

Zhen Li, Yuki Izumida

**Stackings and effective models of bilayer dice lattices. (arXiv:2303.01452v2 [cond-mat.mes-hall] UPDATED)**

P. O. Sukhachov, D. O. Oriekhov, E. V. Gorbar

**Observation of higher-order topological states on a quantum computer. (arXiv:2303.02179v2 [cond-mat.str-el] UPDATED)**

Jin Ming Koh, Tommy Tai, Ching Hua Lee

**Floquet topological superconductors with many Majorana edge modes: topological invariants, entanglement spectrum and bulk-edge correspondence. (arXiv:2303.04674v3 [cond-mat.mes-hall] UPDATED)**

Hailing Wu, Shenlin Wu, Longwen Zhou

**Optical conductivity of bilayer dice lattices. (arXiv:2303.08258v2 [cond-mat.mes-hall] UPDATED)**

P. O. Sukhachov, D. O. Oriekhov, E. V. Gorbar

**PT breaking and RG flows between multicritical Yang-Lee fixed points. (arXiv:2304.08522v2 [cond-mat.stat-mech] UPDATED)**

Máté Lencsés, Alessio Miscioscia, Giuseppe Mussardo, Gábor Takács

**Confined states and topological phases in two-dimensional quasicrystalline $\pi$-flux model. (arXiv:2304.10699v2 [cond-mat.mes-hall] UPDATED)**

Rasoul Ghadimi, Masahiro Hori, Takanori Sugimoto, Takami Tohyama

**Fast dynamics and high effective dimensionality of liquid fluidity. (arXiv:2304.11909v3 [cond-mat.stat-mech] UPDATED)**

Cillian Cockrell, Oliver Dicks, Ilian T. Todorov, Alin M. Elena, Kostya Trachenko

**Quantum phase transition between symmetry enriched topological phases in tensor-network states. (arXiv:2305.02432v2 [cond-mat.str-el] UPDATED)**

Lukas Haller, Wen-Tao Xu, Yu-Jie Liu, Frank Pollmann

**On the validity of the bipolaron model for PEDOT, with and without AlCl4- anions. (arXiv:2305.11720v2 [cond-mat.mtrl-sci] UPDATED)**

Ben Craig, Peter Townsend, Chris Kriton-Skylaris, Carlos Ponce de Leon, Denis Kramer

**Candidate local parent Hamiltonian for 3/7 fractional quantum Hall effect. (arXiv:2305.12400v2 [cond-mat.str-el] UPDATED)**

Koji Kudo, A. Sharma, G. J. Sreejith, J. K. Jain

**Scaling theory of intrinsic Kondo and Hund's rule interactions in magic-angle twisted bilayer graphene. (arXiv:2306.03121v2 [cond-mat.str-el] UPDATED)**

Yang-Zhi Chou, Sankar Das Sarma

**From Edge State Physics to Entanglement Spectrum: Studying Interactions and Impurities in Two-Dimensional Topological Insulators. (arXiv:2307.01913v2 [cond-mat.mes-hall] UPDATED)**

Marcela Derli, E. Novais

**Electrostatic shielding effect and Binding energy shift of MoS$_2$, MoSeS$_2$ and MoTeS$_2$ materials. (arXiv:2307.08035v3 [cond-mat.mtrl-sci] UPDATED)**

Yaorui Tan, Maolin Bo

**Unconventional optical response in monolayer graphene upon dominant intraband scattering. (arXiv:2307.15945v2 [cond-mat.mes-hall] UPDATED)**

Palash Saha, Bala Murali Krishna Mariserla

**First-principle study of spin transport property in $L1_0$-FePd(001)/graphene heterojunction. (arXiv:2308.02171v3 [cond-mat.mtrl-sci] UPDATED)**

Hayato Adachi, Ryuusuke Endo, Hikari Shinya, Hiroshi Naganuma, Mitsuharu Uemoto

**Disorder-Induced Phase Transitions in Three-Dimensional Chiral Second-Order Topological Insulator. (arXiv:2308.02256v2 [cond-mat.mes-hall] UPDATED)**

Yedi Shen, Zeyu Li, Qian Niu, Zhenhua Qiao

**Isolated Majorana mode in a quantum computer from a duality twist. (arXiv:2308.02387v3 [quant-ph] UPDATED)**

Sutapa Samanta, Derek S. Wang, Armin Rahmani, Aditi Mitra

**Disorder Operator and R\'enyi Entanglement Entropy of Symmetric Mass Generation. (arXiv:2308.07380v2 [cond-mat.str-el] UPDATED)**

Zi Hong Liu, Yuan Da Liao, Gaopei Pan, Weilun Jiang, Chao-Ming Jian, Yi-Zhuang You, Fakher F. Assaad, Zi Yang Meng, Cenke Xu

**Non-Hermitian dispersion sign reversal of radiative resonances in two dimensions. (arXiv:2308.09188v2 [cond-mat.mes-hall] UPDATED)**

R. Binder, J.S. Schaibley, N.H. Kwong

**Excitonic interplay between surface polar III-nitride quantum wells and MoS$_2$ monolayer. (arXiv:2308.10687v3 [cond-mat.mes-hall] UPDATED)**

Danxuan Chen, Jin Jiang, Thomas F. K. Weatherley, Jean-François Carlin, Mitali Banerjee, Nicolas Grandjean

**Uniqueness of steady states of Gorini-Kossakowski-Sudarshan-Lindblad equations: a simple proof. (arXiv:2309.00335v2 [quant-ph] UPDATED)**

Hironobu Yoshida

Found 18 papers in prb The discovery of two-dimensional (2D) van der Waals magnetic materials and their heterostructures provided an exciting platform for emerging phenomena with intriguing implications in information technology. Here, based on a multiscale modeling approach that combines first-principles calculations and… Spin squeezing protocols successfully generate entangled many-body quantum states, the key pillars of the second quantum revolution. In our recent work [Phys. Rev. Lett. We introduce a quantum optics platform featuring the minimal ingredients for the description of a spintronically pumped magnon condensate, which we use to promote driven-dissipative phase transitions in the context of spintronics. We consider a Dicke model weakly coupled to an out-of-equilibrium bat… Magnetotoroidal order, also called ferrotoroidicity, is the most recently established type of ferroic state. It is based on a spontaneous and uniform alignment of unit-cell-sized magnetic whirls, called magnetotoroidal moments, associated with a macroscopic toroidization. Because of its intrinsic li… The authors have combined several complementary spectroscopic methods to achieve high-precision control over the superconductivity-induced spectral weight transfer in a DyBa${}_{2}$Cu${}_{3}$O${}_{7}$ film with a superconducting ${T}_{c}$ of 90 K, spanning an energy range over three orders of magnitude from ~1 meV to 1 eV. They find that the Ferrell-Glover-Tinkham sum rule is satisfied within an unprecedented accuracy of 2% by integrating the optical conductivity up to 0.6 eV, consistent with the spectral range of antiferromagnetic spin fluctuations. Three-dimensional massless topological semimetals exhibit linear energy band crossing points that act as monopoles of Berry curvature. Here, an alternative class of massless semimetals is introduced, featuring linear $N$-fold crossing points each of which acts as a source of a We present $^{127}\mathrm{I}$ nuclear quadrupole resonance spectra and nuclear relaxation of $α\text{−}{(\text{BEDT-TTF})}_{2}{\mathrm{I}}_{3}$ that undergoes a charge-ordering transition. Only one of the two ${\mathrm{I}}_{3}$ anion sites shows a significant differentiation in the electric field gr… Quantum anomalous Hall effect (QAHE) is the real topological state without magnetic field that is robust against any perturbations, and is related to a bulk topological number $\mathcal{C}$, counting the number of chiral edge modes. Such chiral edge modes also exist at the magnetic domain walls betw… Electron states with the spin-momentum-locked Dirac dispersion at the surface of a three-dimensional (3D) topological insulator are known to lead to weak antilocalization (WAL), i.e., low temperature and low-magnetic-field quantum interference-induced positive magnetoresistance (MR). In this work, w… Usually, robust invariants in physics take discrete values for the reason of topology, such as integers or fractions in the integer or fractional quantum Hall effect. Here, we show theoretically that the valley Chern number can be responsible for continuous invariants which are insensitive to most p… Two-dimensional second-order topological insulators are characterized by the presence of topologically protected zero-energy bound states localized at the corners of a flake. In this paper we theoretically study the occurrence and features of such corner states inside flakes in the shape of a convex… Herein, we investigate the impact of all electron and phonon scattering mechanisms on the electrical and thermal transport properties of the monolayer and bilayer transition-metal dichalcogenide ${\mathrm{WS}}_{2}$. We used the Boltzmann transport equation under the relaxation-time approximation to … Motivated by the recent studies of intrinsic local moments and Kondo-driven phases in magic-angle twisted bilayer graphene, we investigate the renormalization of Kondo coupling (${J}_{K}$) and the competing Hund's rule interaction ($J$) in the low-energy limit. Specifically, we consider a surrogate … Standard field theoretic formulations of composite fermion theories for the anomalous metals that form at or near even-denominator filling fractions of the lowest Landau level do not possess Galilean invariance. To restore Galilean symmetry, these theories must be supplemented by correction terms. W… The Yb-terminated and Bi-terminated (111) surface electronic structure of topological Kondo semimetal YbPtBi is investigated using both density-functional-theory (DFT) -based calculations and angle-resolved photoemission spectroscopy (ARPES). The cleavage plane is found to be between Yb-layers and B… The equilibrium atomic configuration and electronic structure of the (001) surface of the IV-VI semiconductors PbTe, PbSe, SnTe, and SnSe are studied using density functional theory methods. At the surfaces of all these compounds, the displacements of ions from their perfect lattice sites reveal two… Topological lattice systems combined with nonlinearity and non-Hermiticity can give rise to novel solitons, whose exceptional properties are demonstrated in both unique quench dynamics and topological boundary states. Especially, we focus on an Aubry-André-Harper-type lattice with nonlinear hopping … Among the many two-dimensional materials, germanene and Janus MoSSe have received considerable attention due to their novel electrical and optical properties. We anticipate that the heterojunction formed by germanene and MoSSe will exhibit exceptional properties and immense potential for application…

Date of feed: Wed, 06 Sep 2023 03:17:12 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **${\mathrm{CrTe}}_{2}$ as a two-dimensional material for topological magnetism in complex heterobilayers**

Nihad Abuawwad, Manuel dos Santos Dias, Hazem Abusara, and Samir Lounis

Author(s): Nihad Abuawwad, Manuel dos Santos Dias, Hazem Abusara, and Samir Lounis

[Phys. Rev. B 108, 094409] Published Tue Sep 05, 2023

**Spin squeezing in open Heisenberg spin chains**

T. Hernández Yanes, G. Žlabys, M. Płodzień, D. Burba, M. Mackoit Sinkevičienė, E. Witkowska, and G. Juzeliūnas

Author(s): T. Hernández Yanes, G. Žlabys, M. Płodzień, D. Burba, M. Mackoit Sinkevičienė, E. Witkowska, and G. Juzeliūnas**129**, 090403 (2022)] we showed that spin squeezing described by the one-axis twisting model can be generated in the Heisenberg spin…

[Phys. Rev. B 108, 104301] Published Tue Sep 05, 2023

**Intertwining of lasing and superradiance under spintronic pumping**

Oksana Chelpanova, Alessio Lerose, Shu Zhang, Iacopo Carusotto, Yaroslav Tserkovnyak, and Jamir Marino

Author(s): Oksana Chelpanova, Alessio Lerose, Shu Zhang, Iacopo Carusotto, Yaroslav Tserkovnyak, and Jamir Marino

[Phys. Rev. B 108, 104302] Published Tue Sep 05, 2023

**Long-range order in arrays of composite and monolithic magnetotoroidal moments**

Jannis Lehmann, Naëmi Leo, Laura J. Heyderman, and Manfred Fiebig

Author(s): Jannis Lehmann, Naëmi Leo, Laura J. Heyderman, and Manfred Fiebig

[Phys. Rev. B 108, 104405] Published Tue Sep 05, 2023

**High-precision measurement of the Ferrell-Glover-Tinkham sum rule in a cuprate high-temperature superconductor**

R. D. Dawson, X. Shi, K. S. Rabinovich, D. Putzky, Y.-L. Mathis, G. Christiani, G. Logvenov, B. Keimer, and A. V. Boris

Author(s): R. D. Dawson, X. Shi, K. S. Rabinovich, D. Putzky, Y.-L. Mathis, G. Christiani, G. Logvenov, B. Keimer, and A. V. Boris

[Phys. Rev. B 108, 104501] Published Tue Sep 05, 2023

**Massless multifold Hopf semimetals**

Ansgar Graf and Frédéric Piéchon

Author(s): Ansgar Graf and Frédéric Piéchon*Berry dipole*. We const…

[Phys. Rev. B 108, 115105] Published Tue Sep 05, 2023

**Role of hydrogen bonding in charge-ordered organic conductor $α\text{−}{(\text{BEDT-TTF})}_{2}{\mathrm{I}}_{3}$ probed by $^{127}\mathrm{I}$ nuclear quadrupole resonance**

T. Kobayashi, Y. Kato, H. Taniguchi, T. Tsumuraya, K. Hiraki, and S. Fujiyama

Author(s): T. Kobayashi, Y. Kato, H. Taniguchi, T. Tsumuraya, K. Hiraki, and S. Fujiyama

[Phys. Rev. B 108, 115108] Published Tue Sep 05, 2023

**Topological junctions in high-Chern-number quantum anomalous Hall systems**

Yulei Han, Shiyao Pan, and Zhenhua Qiao

Author(s): Yulei Han, Shiyao Pan, and Zhenhua Qiao

[Phys. Rev. B 108, 115302] Published Tue Sep 05, 2023

**Indication for an anomalous magnetoresistance mechanism in ${(\mathrm{Bi},\mathrm{Sb})}_{2}{(\mathrm{Te},\mathrm{Se})}_{3}$ three-dimensional topological insulator thin films**

N. P. Stepina, A. O. Bazhenov, A. V. Shumilin, A. Yu. Kuntsevich, V. V. Kirienko, E. S. Zhdanov, D. V. Ishchenko, and O. E. Tereshchenko

Author(s): N. P. Stepina, A. O. Bazhenov, A. V. Shumilin, A. Yu. Kuntsevich, V. V. Kirienko, E. S. Zhdanov, D. V. Ishchenko, and O. E. Tereshchenko

[Phys. Rev. B 108, 115401] Published Tue Sep 05, 2023

**Topological ac charge current and continuous invariant in the $α\text{−}{T}_{3}$ lattice under a periodically varying strain**

Ruigang Li, Jun-Feng Liu, and Jun Wang

Author(s): Ruigang Li, Jun-Feng Liu, and Jun Wang

[Phys. Rev. B 108, 115403] Published Tue Sep 05, 2023

**Corner states of two-dimensional second-order topological insulators with a chiral symmetry and broken time reversal and charge conjugation**

Joseph Poata, Fabio Taddei, and Michele Governale

Author(s): Joseph Poata, Fabio Taddei, and Michele Governale

[Phys. Rev. B 108, 115405] Published Tue Sep 05, 2023

**Modeling thermoelectric properties of monolayer and bilayer ${\mathrm{WS}}_{2}$ by including intravalley and intervalley scattering mechanisms**

Raveena Gupta and Chandan Bera

Author(s): Raveena Gupta and Chandan Bera

[Phys. Rev. B 108, 115406] Published Tue Sep 05, 2023

**Scaling theory of intrinsic Kondo and Hund's rule interactions in magic-angle twisted bilayer graphene**

Yang-Zhi Chou and Sankar Das Sarma

Author(s): Yang-Zhi Chou and Sankar Das Sarma

[Phys. Rev. B 108, 125106] Published Tue Sep 05, 2023

**Weiss oscillations in Galilean-invariant Dirac composite fermion theory for even-denominator filling fractions of the lowest Landau level**

Yen-Wen Lu, Prashant Kumar, and Michael Mulligan

Author(s): Yen-Wen Lu, Prashant Kumar, and Michael Mulligan

[Phys. Rev. B 108, 125109] Published Tue Sep 05, 2023

**Valence transition and termination-dependent surface states in the topological Kondo semimetal YbPtBi**

Yuan Fang, Zhongzheng Wu, Guowei Yang, Yuwei Zhang, Weifan Zhu, Yi Wu, Chunyu Guo, Yuke Li, Huiqiu Yuan, Jian-Xin Zhu, Yang Liu, and Chao Cao

Author(s): Yuan Fang, Zhongzheng Wu, Guowei Yang, Yuwei Zhang, Weifan Zhu, Yi Wu, Chunyu Guo, Yuke Li, Huiqiu Yuan, Jian-Xin Zhu, Yang Liu, and Chao Cao

[Phys. Rev. B 108, 125110] Published Tue Sep 05, 2023

**Reconstruction, rumpling, and Dirac states at the (001) surface of the topological crystalline insulator ${\text{Pb}}_{1−x}{\text{Sn}}_{x}\text{Se}$**

A. Łusakowski, P. Bogusławski, and T. Story

Author(s): A. Łusakowski, P. Bogusławski, and T. Story

[Phys. Rev. B 108, 125201] Published Tue Sep 05, 2023

**Topological skin modes and intensity amplification in a nonlinear non-Hermitian lattice**

Zhi-Xu Zhang, Ji Cao, Jing-Quan Li, Yu Zhang, Shutian Liu, Shou Zhang, and Hong-Fu Wang

Author(s): Zhi-Xu Zhang, Ji Cao, Jing-Quan Li, Yu Zhang, Shutian Liu, Shou Zhang, and Hong-Fu Wang

[Phys. Rev. B 108, 125402] Published Tue Sep 05, 2023

**Effects of electric field and interlayer coupling on Schottky barrier of germanene/MoSSe vertical heterojunction**

Jun Yuan, Fanfan Wang, Zhufeng Zhang, Baoan Song, Shubin Yan, Ming-Hui Shang, Chaohui Tong, and Jun Zhou

Author(s): Jun Yuan, Fanfan Wang, Zhufeng Zhang, Baoan Song, Shubin Yan, Ming-Hui Shang, Chaohui Tong, and Jun Zhou

[Phys. Rev. B 108, 125404] Published Tue Sep 05, 2023

Found 2 papers in prl Charge radii of neutron deficient $^{40}\mathrm{Sc}$ and $^{41}\mathrm{Sc}$ nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number $N=20$ and shows a pronounced kink, generally taken as a signature of a shell … Skimmed supersonic beams provide intense, cold, collision-free samples of atoms and molecules and are one of the most widely used tools in atomic and molecular laser spectroscopy. High-resolution optical spectra are typically recorded in a perpendicular arrangement of laser and supersonic beams to m…

Date of feed: Wed, 06 Sep 2023 03:17:11 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Surprising Charge-Radius Kink in the Sc Isotopes at $N=20$**

Kristian König, Stephan Fritzsche, Gaute Hagen, Jason D. Holt, Andrew Klose, Jeremy Lantis, Yuan Liu, Kei Minamisono, Takayuki Miyagi, Witold Nazarewicz, Thomas Papenbrock, Skyy V. Pineda, Robert Powel, and Paul-Gerhard Reinhard

Author(s): Kristian König, Stephan Fritzsche, Gaute Hagen, Jason D. Holt, Andrew Klose, Jeremy Lantis, Yuan Liu, Kei Minamisono, Takayuki Miyagi, Witold Nazarewicz, Thomas Papenbrock, Skyy V. Pineda, Robert Powel, and Paul-Gerhard Reinhard

[Phys. Rev. Lett. 131, 102501] Published Tue Sep 05, 2023

**Imaging-Assisted Single-Photon Doppler-Free Laser Spectroscopy and the Ionization Energy of Metastable Triplet Helium**

Gloria Clausen, Simon Scheidegger, Josef A. Agner, Hansjürg Schmutz, and Frédéric Merkt

Author(s): Gloria Clausen, Simon Scheidegger, Josef A. Agner, Hansjürg Schmutz, and Frédéric Merkt

[Phys. Rev. Lett. 131, 103001] Published Tue Sep 05, 2023

Found 1 papers in nano-lett

Date of feed: Tue, 05 Sep 2023 13:08:24 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] Toward High-Peak-to-Valley-Ratio Graphene Resonant Tunneling Diodes**

Zihao Zhang, Baoqing Zhang, Yiming Wang, Mingyang Wang, Yifei Zhang, Hu Li, Jiawei Zhang, and Aimin SongNano LettersDOI: 10.1021/acs.nanolett.3c02281

Found 1 papers in acs-nano

Date of feed: Tue, 05 Sep 2023 13:04:23 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] On-Surface Synthesis of Graphene Nanoribbons with Atomically Precise Structural Heterogeneities and On-Site Characterizations**

Ruoting Yin, Zhengya Wang, Shijing Tan, Chuanxu Ma, and Bing WangACS NanoDOI: 10.1021/acsnano.3c06128

Found 1 papers in nat-comm **Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Topological magneto-optical effect from skyrmion lattice**

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