Found 36 papers in cond-mat Edge effect is one of the detrimental factors preventing superlubricity in
laminar solid lubricants. Separating the friction contribution from the edge
atom and inner atom is of paramount importance for rational design of ultralow
friction across scales in van der Waals heterostructures. To decouple these
contributions and provide the underlying microscopic origin at the atomistic
level, we considered two contrast models, namely, graphene nanoflakes with
dimerized and pristine edges sliding on graphene monolayer based on extensive
ab initio calculations. We found the edge contribution to friction is lattice
orientation dependence. In particular, edge pinning effect by dimerization is
obvious for misaligned contact but suppressed in aligned lattice orientation.
The former case providing local commensuration along edges is reminiscent of
Aubry's pinned phase and the contribution of per edge carbon atom to the
sliding potential energy corrugation is even 1.5 times more than that of an
atom in bilayer graphene under commensurate contact. Furthermore, we
demonstrated that the dimerized edges as high frictional pinning sites are
robust to strain engineering and even enhanced by fluorination. Both structural
and chemical modification in the tribological system constructed here offers
the atomic details to dissect the undesirable edge pinning effect in layered
materials which may give rise to the marked discrepancies in measured friction
parameters from the same superlubric sample or different samples with the same
size and identical preparation.
The experimental discovery of fractional Chern insulators (FCIs) in
rhombohedral pentalayer graphene twisted on hexagonal boron nitride (hBN) has
preceded theoretical prediction. Supported by large-scale first principles
relaxation calculations at the experimental twist angle of $0.77^\circ$, we
obtain an accurate continuum model of $n=3,4,5,6,7$ layer rhombohedral
graphene-hBN moir\'e systems. Focusing on the pentalayer case, we analytically
explain the robust $|C|=0,5$ Chern numbers seen in the low-energy
single-particle bands and their flattening with displacement field, making use
of a minimal two-flavor continuum Hamiltonian derived from the full model. We
then predict nonzero valley Chern numbers at the $\nu = -4,0$ insulators
observed in experiment. Our analysis makes clear the importance of displacement
field and the moir\'e potential in producing localized "heavy fermion" charge
density in the top valence band, in addition to the nearly free conduction
band. Lastly, we study doubly aligned devices as additional platforms for
moir\'e FCIs with higher Chern number bands.
Non-Fermi liquids arise when strong interactions destroy stable fermionic
quasiparticles. The simplest models featuring this phenomenon involve a Fermi
surface coupled to fluctuating gapless bosonic order parameter fields, broadly
referred to as "Hertz-Millis" models. We revisit a controlled approach to
Hertz-Millis models that combines an expansion in the inverse number ($N$) of
fermion species with an expansion in the deviation of the boson dynamical
critical exponent $z$ from 2. The structure of the expansion is found to be
qualitatively different in the quantum critical regime $\Omega \ll q$ and in
the transport regime $\Omega \gg q$. In particular, correlation functions in
the transport regime involve infinitely many diagrams at each order in
perturbation theory. We provide an explicit and tractable recipe to classify
and resum these diagrams. For the simplest Hertz-Millis models, we show that
this recipe is consistent with non-perturbative anomaly arguments and correctly
captures the fixed point optical conductivity as well as leading corrections
from irrelevant operators. We comment on potential applications of this
expansion to transport in more complicated Hertz-Millis models as well as
certain beyond-Landau metallic quantum critical points.
We measured the spectrum of a single-carrier bilayer graphene quantum dot as
a function of both parallel and perpendicular magnetic fields, using a
time-resolved charge detection technique that gives access to individual tunnel
events. Thanks to our unprecedented energy resolution of 4$\mu~$eV, we could
distinguish all four levels of the dot's first orbital, in particular in the
range of magnetic fields where the first and second excited states cross
($B_\perp\lesssim 100~$mT). We thereby experimentally establish, the hitherto
extrapolated, single-charge carrier spectrum picture and provide a new upper
bound for the inter-valley mixing, equal to our energy resolution.
Hydrazine stands out as the most generally used chemical-reducing agent for
reducing graphene oxide. Despite numerous experimental and theoretical
investigations into the reduction reaction, the reduction mechanism remains
unclear. In this study, we propose that, in aqueous hydrazine solutions, both
hydrazine and hydroxide ions could initiate the reduction of graphene oxide. We
introduce a chemical reaction pathway involving C-H cleavage and a
dehydroxylation process for the reduction of graphene oxide. By utilizing
density functional theory calculations, the reduction reactions mediated by
hydrazine and hydroxide ions are separately investigated. The reaction routes
on the basal plane and edge regions of graphene oxide are discussed
independently. The density functional theory calculations demonstrate that the
proposed mechanism is both thermodynamically and dynamically feasible. This
work might contribute to an atomic-level comprehension of a longstanding
challenge in the field of graphene oxide.
2D materials are considered a key element in the development of
next-generation electronics (nanoelectronics) due to their extreme thickness in
the nanometer range and unique physical properties. The ultrafast dynamics of
photoexcited carriers in such materials is strongly influenced by their
interfaces, since the thickness of 2D materials is much smaller than the
typical depth of light penetration into them and the mean free path of
photoexcited carriers. The resulting collisions of photoexcited carriers with
interfacial potential barriers of 2D materials in the presence of a strong
laser field significantly alter the overall dynamics of photoexcitation,
allowing laser light to be directly absorbed by carriers in the
conduction/valence band through the inverse bremsstrahlung mechanism. The
corresponding ultrafast carrier dynamics can be monitored using
multiphoton-pumped UV-Vis transient absorption spectroscopy. In this review, we
discuss the basic concepts and recent applications of this spectroscopy for a
variety of 2D materials, including transition-metal dichalcogenide monolayers,
topological insulators, and other 2D semiconductor structures.
We have previously found experimental evidence for several quantum phenomena
in oxygen-ion implanted of hydrogenated graphite: ferromagnetism,
antiferromagnetism, paramagentism, triplet superconductivity, Andreev states,
Little-Parks oscillations, Lamb shift, Casimir effect, colossal
magnetoresistance, and topologically-protected flat-energy bands [1-6]. Triplet
superconductivity results in the formation of Josephson junctions, thus with
potential of being used for spintronics applications in the critical area of
quantum computing. In this paper, we are showing new experimental evidence for
the formation of two-dimensional (2D) spin waves in oxygen-ion enriched and in
hydrogenated highly oriented pyrolytic graphite. The temperature evolution of
the remanent magnetization Mrem(T) data confirms the formation of spin waves
that follow the 2D Heisenberg model with a weak uniaxial anisotropy. In
addition, the step-like features also found in the temperature dependence of
the electrical resistivity between insulating and metallic states suggest
several outstanding possibilities, such as a structural transition, triplet
superconductivity, and chiral properties.
Skyrmions and antiskyrmions are nanoscale swirling textures of magnetic
moments formed by chiral interactions between atomic spins in magnetic
non-centrosymmetric materials and multilayer films with broken inversion
symmetry. These quasiparticles are of interest for use as information carriers
in next-generation, low-energy spintronic applications. To develop
skyrmion-based memory and logic, we must understand skyrmion-defect
interactions with two main goals -- determining how skyrmions navigate
intrinsic material defects and determining how to engineer disorder for optimal
device operation. Here, we introduce a tunable means of creating a
skyrmion-antiskyrmion system by engineering the disorder landscape in FeGe
using ion irradiation. Specifically, we irradiate epitaxial B20-phase FeGe
films with 2.8 MeV Au$^{4+}$ ions at varying fluences, inducing amorphous
regions within the crystalline matrix. Using low-temperature electrical
transport and magnetization measurements, we observe a strong topological Hall
effect with a double-peak feature that serves as a signature of skyrmions and
antiskyrmions. These results are a step towards the development of information
storage devices that use skyrmions and anitskyrmions as storage bits and our
system may serve as a testbed for theoretically predicted phenomena in
skyrmion-antiskyrmion crystals.
We focus on a scenario of non-Hermitian bulk--boundary correspondence that
uses a topological invariant defined in a bulk geometry under a modified
periodic boundary condition. Although this has succeeded in describing the
topological nature of various one-dimensional non-Hermitian systems, its
application to two-dimensional systems has been limited to a non-Hermitian
Chern insulator. Here, we adapt the scenario to a non-Hermitian quantum
spin-Hall insulator to extend its applicability. We show that it properly
describes the bulk--boundary correspondence in the non-Hermitian quantum
spin-Hall insulator. A phase diagram derived from the bulk--boundary
correspondence is shown to be consistent with spectra of the system under an
open boundary condition.
The geometric response of quantum Hall liquids is an important aspect to
understand their topological characteristics in addition to the electromagnetic
response. According to the Wen-Zee theory, the topological spin is coupled to
the curvature of the space in which the electrons reside. The presence of
conical geometry provides a local isolated geometric singularity, making it
suitable for exploring the geometric response. In the context of
two-dimensional electrons in a perpendicular magnetic field, each Landau orbit
occupies the same area. The cone geometry naturally provides a structure in
which the distances between two adjacent orbits gradually change and can be
easily adjusted by altering the tip angle. The presence of a cone tip
introduces a geometric singularity that affects the electron density and
interacts with the motion of electrons, which has been extensively studied.
Furthermore, this type of geometry can automatically create a smooth interface
or crossover between the crystalline charge-density-wave state and the
liquid-like fractional quantum Hall state. In this work, the properties of this
interface are studied from multiple perspectives, shedding light on the
behavior of quantum Hall liquids in such geometric configurations.
Epitaxial strain has emerged as a powerful tool to tune magnetic and
ferroelectric properties in functional materials such as in multiferroic
perovskite oxides. Here, we use first-principles calculations to explore the
evolution of magnetic interactions in the antiferromagnetic multiferroic
BiFeO$_3$ (BFO), one of the most promising multiferroics for future technology.
The epitaxial strain in BFO(001) oriented film is varied between
$\varepsilon_{xx,yy}$ $\in$ $[-2\%, +2\%]$. We find that both strengths of the
exchange interaction and Dzyaloshinskii-Moriya interaction (DMI) decrease
linearly from compressive to tensile strain whereas the uniaxial
magnetocrystalline anisotropy follows a parabolic behavior which lifts the
energy degeneracy of the (111) easy plane of bulk BFO. From the trends of the
magnetic interactions we can explain the destruction of cycloidal order in
compressive strain as observed in experiments due to the increasing anisotropy
energy. For tensile strain, we predict that the ground state remains unchanged
as a function of strain. By using the domain wall (DW) energy, we envision the
region where isolated chiral magnetic texture might occur as function of strain
i.e. where the DW and the spin spiral energy are equal. This transition between
$-1.5\%$ and $-0.5\%$ of strain should allow topologically stable magnetic
states such as antiferromagnetic skyrmions and merons to occur. Hence, our work
should trigger experimental and theoretical investigations in this range of
strain.
The emerging field of orbitronics aims at generating and controlling currents
of electronic orbital angular momentum (OAM) for information processing.
Structurally chiral topological crystals could be particularly suitable
orbitronic materials because they have been predicted to host topological band
degeneracies in reciprocal space that are monopoles of OAM. Around such a
monopole, the OAM is locked isotopically parallel or antiparallel to the
direction of the electron's momentum, which could be used to generate large and
controllable OAM currents. However, OAM monopoles have not yet been directly
observed in chiral crystals, and no handle to control their polarity has been
discovered. Here, we use circular dichroism in angle-resolved photoelectron
spectroscopy (CD-ARPES) to image OAM monopoles in the chiral topological
semimetals PtGa and PdGa. Moreover, we also demonstrate that the polarity of
the monopole can be controlled via the structural handedness of the host
crystal by imaging OAM monopoles and anti-monopoles in the two enantiomers of
PdGa, respectively. For most photon energies used in our study, we observe a
sign change in the CD-ARPES spectrum when comparing positive and negative
momenta along the light direction near the topological degeneracy. This is
consistent with the conventional view that CD-ARPES measures the projection of
the OAM monopole along the photon momentum. For some photon energies, however,
this sign change disappears, which can be understood from our numerical
simulations as the interference of polar atomic OAM contributions, consistent
with the presence of OAM monopoles. Our results highlight the potential of
chiral crystals for orbitronic device applications, and our methodology could
enable the discovery of even more complicated nodal OAM textures that could be
exploited for orbitronics.
The integration of photonic microstructure into organic microcavities
represents an effective strategy for manipulating eigenstates of cavity or
polariton modes. However, well-established fabrication processes for
microstructured organic microcavities are still lacking. In this study, we
propose a nanoimprint-bonding process as a novel fabrication method for
microstructured organic microcavities. This process relies on a UV nanoimprint
technique utilizing two different photopolymer resins, enabling the independent
fabrication of highly reflective reflectors and photonic microstructures
without compromising the accuracy of each. The resulting organic microcavities
demonstrate spatially localized photonic modes within dot structures and their
nonlinear responses on the pumping fluence. Furthermore, a highly precise
photonic band is confirmed within a honeycomb lattice structure, which is owing
to the high quality factor of the cavity achievable with the
nanoimprint-bonding process. Additionally, a topological edge state is also
observable within a zigzag lattice structure. These results highlight the
significant potential of our fabrication method for advancing organic-based
photonic devices, including lasers and polariton devices.
The space-time process whereby one-dimensional systems of self-sustained
oscillators synchronize is shown to display generic scale invariance, with
scaling properties characteristic of the Kardar-Parisi-Zhang equation with
columnar noise, and phase fluctuations that follow a Tracy-Widom probability
distribution. This is revealed by a numerical exploration of rings of
Stuart-Landau oscillators (the universal representation of an oscillating
system close to a Hopf bifurcation) and rings of van der Pol oscillators, both
of which are paradigms of self-sustained oscillators. The critical behavior is
very well-defined for limit-cycle oscillations near the bifurcation point, and
still dominates the behavior comparatively far from the bifurcation. In
particular, the Tracy-Widom fluctuation distribution seems to be an extremely
robust feature of the synchronization process. The nonequilibrium criticality
here described appears to transcend the details of the coupled dynamical
systems that synchronize, making plausible its experimental observation.
Strong light fields have created spectacular opportunities to tailor novel
functionalities of solids. Floquet-Bloch states can form under periodic driving
of electrons and enable exotic quantum phases. On subcycle time scales,
lightwaves can simultaneously drive intraband currents and interband
transitions, which enable high-harmonic generation (HHG) and pave the way
towards ultrafast electronics. Yet, the interplay of intra- and interband
excitations as well as their relation with Floquet physics have been key open
questions as dynamical aspects of Floquet states have remained elusive. Here we
provide this pivotal link by pioneering the ultrafast buildup of Floquet-Bloch
bands with time- and angle-resolved photoemission spectroscopy. We drive
surface states on a topological insulator with mid-infrared fields - strong
enough for HHG - and directly monitor the transient band structure with
subcycle time resolution. Starting with strong intraband currents, we observe
how Floquet sidebands emerge within a single optical cycle; intraband
acceleration simultaneously proceeds in multiple sidebands until high-energy
electrons scatter into bulk states and dissipation destroys the Floquet bands.
Quantum nonequilibrium calculations explain the simultaneous occurrence of
Floquet states with intra- and interband dynamics. Our joint experiment-theory
study opens up a direct time-domain view of Floquet physics and explores the
fundamental frontiers of ultrafast band-structure engineering.
Topological flat band, on which the kinetic energy of topological electrons
is quenched, represents a platform for investigating the topological properties
of correlated systems. Recent experimental studies on flattened electronic
bands have mainly concentrated on 2-dimensional materials created by van der
Waals heterostructure-based engineering. Here, we report the observation of a
topological flat band formed by polar-distortion-assisted Rashba splitting in a
3-dimensional Dirac material ZrTe$_5$. The polar distortion and resulting
Rashba splitting on the band are directly detected by torque magnetometry and
the anomalous Hall effect, respectively. The local symmetry breaking further
flattens the band, on which we observe resistance oscillations beyond the
quantum limit. These oscillations follow the temperature dependence of the
Lifshitz-Kosevich formula but are evenly distributed in B instead of 1/B in
high magnetic fields. Furthermore, the cyclotron mass anomalously gets enhanced
about 10$^2$ times at field ~20 T. These anomalous properties of oscillations
originate from a topological flat band with quenched kinetic energy. The
topological flat band, realized by polar-distortion-assisted Rashba splitting
in the 3-dimensional Dirac system ZrTe$_5$, signifies an intrinsic platform
without invoking moir\'e or order-stacking engineering, and also opens the door
for studying topologically correlated phenomena beyond the dimensionality of
two.
The fascinating realm of strain engineering and wetting transitions in
two-dimensional (2D) materials takes place when placed on a two-dimensional
array of nanopillars or one-dimensional rectangular grated substrates. Our
investigation encompasses a diverse set of atomically thin 2D materials,
including transition metal dichalcogenides, hexagonal boron nitride, and
graphene, with a keen focus on the impact of van der Waals adhesion energies to
the substrate on the wetting/dewetting behavior on nanopatterned substrates. We
find a critical aspect ratio of the nanopillar or grating heights to the period
of the pattern when the wetting/dewetting transition occurs. Furthermore,
energy hysteresis analysis reveals dynamic detachment and re-engagement events
during height adjustments, shedding light on energy barriers of 2D monolayer
transferred on patterned substrates. Our findings offer avenues for strain
engineering in 2D materials, leading to promising prospects for future
technological applications.
Superposed symmetry-equivalent magnetic ordering wave vectors can lead to
topologically non-trivial spin textures, such as magnetic skyrmions and
hedgehogs, and give rise to novel quantum phenomena due to fictitious magnetic
fields associated with a non-zero Berry curvature of these spin textures. To
date, all known spin textures are constructed through the superposition of
multiple spiral orders, where spins vary in directions with constant amplitude.
Recent theoretical studies have suggested that multiple sinusoidal orders,
where collinear spins vary in amplitude, can construct distinct topological
spin textures regarding chirality properties. However, such textures have yet
to be experimentally realised. In this work, we report the observation of a
zero-field magnetic hedgehog lattice from a superposition of triple sinusoidal
wave vectors in the magnetically frustrated Kondo lattice CePtAl4Ge2. Notably,
we also observe the emergence of anomalous electrical and thermodynamic
behaviours near the field-induced transition from the zero-field topological
hedgehog lattice to a non-topological sinusoidal state. These observations
highlight the role of Kondo coupling in stabilising the zero-field hedgehog
state in the Kondo lattice and warrant an expedited search for other
topological magnetic structures coupled with Kondo coupling.
This work is concerned with tree tensor network operators (TTNOs) for
representing quantum Hamiltonians. We first establish a mathematical framework
connecting tree topologies with state diagrams. Based on these, we devise an
algorithm for constructing a TTNO given a Hamiltonian. The algorithm exploits
the tensor product structure of the Hamiltonian to add paths to a state
diagram, while combining local operators if possible. We test the capabilities
of our algorithm on random Hamiltonians for a given tree structure.
Additionally, we construct explicit TTNOs for nearest neighbour interactions on
a tree topology. Furthermore, we derive a bound on the bond dimension of tensor
operators representing arbitrary interactions on trees. Finally, we consider an
open quantum system in the form of a Heisenberg spin chain coupled to bosonic
bath sites as a concrete example. We find that tree structures allow for lower
bond dimensions of the Hamiltonian tensor network representation compared to a
matrix product operator structure. This reduction is large enough to reduce the
number of total tensor elements required as soon as the number of baths per
spin reaches $3$.
We report on a lightwave-driven scanning tunneling microscope based on a
home-built microscope and a compact, commercial, and cost-effective
terahertz-generation unit with a repetition rate of 100 MHz. The measurements
are performed in ultrahigh vacuum at temperatures between 10 K and 300 K. The
cross-correlation of the pump and probe pulses indicate a temporal resolution
on the order of a picosecond. In terms of spatial resolution, CO molecules,
step edges and atomically resolved terraces are readily observed in terahertz
images, with sometimes better contrast than in the topographic and (DC) current
channels. The utilization of a compact, turn-key terahertz-generation system
requires only limited experience with optics and terahertz generation, which
may facilitate the deployment of the technique to further research groups.
Our understanding of quantum materials is commonly based on precise
determinations of their electronic spectrum by spectroscopic means, most
notably angle-resolved photoemission spectroscopy (ARPES) and scanning
tunneling microscopy (STM). Both require atomically clean and flat crystal
surfaces which traditionally are prepared by in-situ mechanical cleaving in
ultrahigh vacuum chambers. We present a new approach that addresses three main
issues of the current state-of-the-art methods: 1) Cleaving is a highly
stochastic and thus inefficient process; 2) Fracture processes are governed by
the bonds in a bulk crystal, and many materials and surfaces simply do not
cleave; 3) The location of the cleave is random, preventing data collection at
specified regions of interest. Our new workflow is based on Focused Ion Beam
(FIB) machining of micro-stress lenses in which shape (rather than crystalline)
anisotropy dictates the plane of cleavage, which can be placed at a specific
target layer. As proof-of-principle we show ARPES results from micro-cleaves of
Sr$_2$RuO$_4$ along the ac plane and from two surface orientations of
SrTiO$_3$, a notoriously difficult to cleave cubic perovskite.
We propose a family of IR dualities for 3d $\mathcal{N}=4$ $U(N)$ SQCD with
$N_f$ fundamental flavors and $P$ Abelian hypermultiplets i.e. $P$
hypermultiplets in the determinant representation of the gauge group. These
theories are good in the Gaiotto-Witten sense if the number of fundamental
flavors obeys the constraint $N_f \geq 2N-1$ with generic $P \geq 1$, and in
contrast to the standard $U(N)$ SQCD, they do not admit an ugly regime. The IR
dualities in question arise in the window $N_f=2N+1,2N,2N-1,$ with $P=1$ in the
first case and generic $P \geq 1$ for the others. The dualities involving
$N_f=2N \pm 1$ are characterized by an IR enhancement of the Coulomb branch
global symmetry on one side of the duality, such that the rank of the emergent
global symmetry group is greater than the rank of the UV global symmetry. The
dual description makes the rank of this emergent global symmetry manifest in
the UV. In addition, one can read off the emergent global symmetry itself from
the dual quiver. We show that these dualities are related by certain field
theory operations and assemble themselves into a duality web. Finally, we show
that the $U(N)$ SQCDs with $N_f \geq 2N-1$ and $P$ Abelian hypers have
Lagrangian 3d mirrors, and this allows one to explicitly write down the 3d
mirror associated with a given IR dual pair. This paper is the first in a
series of four papers on 3d $\mathcal{N}=4$ Seiberg-like dualities.
An important open puzzle in the superconductivity of UTe$_2$ is the emergence
of time-reversal broken superconductivity from a non-magnetic normal state.
Breaking time-reversal symmetry in a single second-order superconducting
transition requires the existence of two degenerate superconducting order
parameters, which is not natural for orthorhombic UTe$_2$. Moreover,
experiments under pressure (Braithwaite et. al., Comm. Phys. \bf{2}, 147
(2019), arXiv:1909.06074 [cond-mat.str-el]) suggest that superconductivity sets
in at a single transition temperature in a finite parameter window, in contrast
to the splitting between the symmetry breaking temperatures expected for
accidental degenerate orders. Motivated by these observations, we propose a
mechanism for the emergence of time-reversal breaking superconductivity without
accidental or symmetry-enforced order parameter degeneracies in systems close
to a magnetic phase transition. We demonstrate using Landau theory that a cubic
coupling between incipient magnetic order and magnetic moments of Cooper pairs
(pair-Kondo coupling) can drive time-reversal symmetry breaking
superconductivity that onsets in a single, weakly first order transition over
an extended region of the phase diagram. We discuss the experimental signatures
of such transition in thermodynamic and resonant ultrasound measurements. A
microscopic origin of pair-Kondo coupling is identified as screening of
magnetic moments by chiral Cooper pairs, built out of two non-degenerate order
parameters - an extension of Kondo screening to unconventional pairs.
The nature of the bulk topological order of the 5/2 non-Abelian fractional
quantum Hall state and the steady-state of its edge are long-studied questions.
The most promising non-Abelian model bulk states are the Pfaffian (Pf),
anti-Pffafian (APf), and particle-hole symmetric Pfaffian (PHPf). Here, we
propose to employ a set of dc current-current correlations \emph{(electrical
shot noise)} in order to distinguish among the Pf, APf, and PHPf candidate
states, as well as to determine their edge thermal equilibration regimes: full
vs.\ partial. Using other tools, measurements of GaAs platforms have already
indicated consistency with the PHPf state. Our protocol, realizable with
available experimental tools, is based on fully electrical measurements.
The three-dimensional Dirac semimetal is distinct from its two-dimensional
counterpart due to its dimensionality and symmetry. Here, we observe that
molecule-based quasi-two-dimensional Dirac fermion system,
$\alpha$-(BEDT-TTF)$_2$I$_3$, exhibits chiral anomaly-induced negative
magnetoresistance and planar Hall effect upon entering the coherent inter-layer
tunneling regime under high pressure. Time-reversal symmetry is broken due to
the strong electronic correlation effect, while the spin-orbit coupling effect
is negligible. The system provides an ideal platform for investigating the
chiral anomaly physics by controlling dimensionality and strong electronic
correlation.
A (2+1)D topologically ordered phase may or may not have a gappable edge,
even if its chiral central charge $c_-$ is vanishing. Recently, it is
discovered that a quantity regarded as a "higher" version of chiral central
charge gives a further obstruction beyond $c_-$ to gapping out the edge. In
this Letter, we show that the higher central charges can be characterized by
the expectation value of the \textit{partial rotation} operator acting on the
wavefunction of the topologically ordered state. This allows us to extract the
higher central charge from a single wavefunction, which can be evaluated on a
quantum computer. Our characterization of the higher central charge is
analytically derived from the modular properties of edge conformal field
theory, as well as the numerical results with the $\nu=1/2$ bosonic Laughlin
state and the non-Abelian gapped phase of the Kitaev honeycomb model, which
corresponds to $\mathrm{U}(1)_2$ and Ising topological order respectively. The
letter establishes a numerical method to obtain a set of obstructions to the
gappable edge of (2+1)D bosonic topological order beyond $c_-$, which enables
us to completely determine if a (2+1)D bosonic Abelian topological order has a
gappable edge or not. We also point out that the expectation values of the
partial rotation on a single wavefunction put a constraint on the low-energy
spectrum of the bulk-boundary system of (2+1)D bosonic topological order,
reminiscent of the Lieb-Schultz-Mattis type theorems.
The non-Hermitian skin effect under open boundary conditions is widely
believed to originate from the intrinsic spectral topology under periodic
boundary conditions. If the eigenspectra under periodic boundary conditions
have no spectral windings (e.g., piecewise arcs) or a finite area on the
complex plane, there will be no non-Hermitian skin effect with open boundaries.
In this article, we demonstrate another scenario beyond this perception by
introducing a two-dimensional periodically driven model. The effective Floquet
Hamiltonian lacks intrinsic spectral topology and is proportional to the
identity matrix (representing a single point on the complex plane) under
periodic boundary conditions. Yet, the Floquet Hamiltonian exhibits a
second-order skin effect that is robust against perturbations and disorder
under open boundary conditions. We further reveal the dynamical origin of these
second-order skin modes and illustrate that they are characterized by a
dynamical topological invariant of the full time-evolution operator.
One of the most important practical hallmarks of topological matter is the
presence of topologically protected, exponentially localised edge states at
interfaces of regions characterised by unequal topological invariants. Here, we
show that even when driven far from their equilibrium ground state, Chern
insulators can inherit topological edge features from their parent Hamiltonian.
In particular, we show that the asymptotic long-time approach of the
non-equilibrium steady state, governed by a Lindblad Master equation, can
exhibit edge-selective extremal damping. This phenomenon derives from edge
states of non-Hermitian extensions of the parent Chern insulator Hamiltonian.
The combination of (non-Hermitian) topology and dissipation hence allows to
design topologically robust, spatially localised damping patterns.
In two-dimensional artificial crystals with large real-space periodicity, the
nonlinear current response to a large applied electric field can feature a
strong angular dependence, which encodes information about the band dispersion
and Berry curvature of isolated electronic Bloch minibands. Within the
relaxation-time approximation, we obtain analytic expressions up to infinite
order in the driving field for the current in a band-projected theory with
time-reversal and trigonal symmetry. For a fixed field strength, the dependence
of the current on the direction of the applied field is given by rose curves
whose petal structure is symmetry constrained and is obtained from an expansion
in real-space translation vectors. We illustrate our theory with calculations
on periodically-buckled graphene and twisted double bilayer graphene, wherein
the discussed physics can be accessed at experimentally-relevant field
strengths.
Volkov-Pankratov surface bands arise in smooth topological interfaces, i.e.
interfaces between a topological and a trivial insulator, in addition to the
chiral surface state imposed by the bulk-surface correspondence of topological
materials. These two-dimensional bands become Landau-quantized if a magnetic
field is applied perpendicular to the interface. I show that the energy scales,
which are typically in the 10-100 meV range, can be controlled both by the
perpendicular magnetic field and the interface width. The latter can still be
varied with the help of a magnetic-field component in the interface. The Landau
levels of the different Volkov-Pankratov bands are optically coupled, and their
arrangement may allow one to obtain population inversion by resonant optical
pumping. This could serve as the elementary brick of a multi-level laser based
on Landau levels. Moreover, the photons are absorbed and emitted either
parallel or perpendicular to the magnetic field, respectively in the Voigt and
Faraday geometry, depending on the Volkov-Pankratov bands and Landau levels
involved in the optical transitions.
A complicating factor in the realization and observation of quantum spin
liquids in materials is the ubiquitous presence of other degrees of freedom, in
particular lattice distortion modes (phonons). These provide additional routes
for relieving magnetic frustration, thereby possibly destabilizing spin-liquid
ground states. In this work, we focus on triangular-lattice Heisenberg
antiferromagnets, where recent numerical evidence suggests the presence of an
extended U(1) Dirac spin liquid phase which is described by compact quantum
electrodynamics in 2+1 dimensions (QED$_3$), featuring gapless spinons and
monopoles as gauge excitations, and believed to flow to a strongly-coupled
fixed point with conformal symmetry. Using complementary perturbation theory
and scaling arguments, we show that a symmetry-allowed coupling between
(classical) finite-wavevector lattice distortions and monopole operators of the
U(1) Dirac spin liquid generally induces a spin-Peierls instability towards a
(confining) 12-site valence-bond solid state. We support our theoretical
analysis with state-of-the-art density matrix renormalization group
simulations. Away from the limit of static distortions, we demonstrate that the
phonon energy gap establishes a parameter regime where the spin liquid is
expected to be stable, and show that the monopole-lattice coupling leads to
softening of the phonon in analogy to the Kohn anomaly. We discuss the
applicability of our results to similar systems, in particular the Dirac spin
liquid on the Kagome lattice.
We propose a theoretical framework that explains how the mass of simple and
higher-order networks emerges from their topology and geometry. We use the
discrete topological Dirac operator to define an action for a massless
self-interacting topological Dirac field inspired by the Nambu-Jona Lasinio
model. The mass of the network is strictly speaking the mass of this
topological Dirac field defined on the network; it results from the chiral
symmetry breaking of the model and satisfies a self-consistent gap equation.
Interestingly, it is shown that the mass of a network depends on its spectral
properties, topology, and geometry. Due to the breaking of the
matter-antimatter symmetry observed for the harmonic modes of the discrete
topological Dirac operator, two possible definitions of the network mass can be
given. For both possible definitions, the mass of the network comes from a gap
equation with the difference among the two definitions encoded in the value of
the bare mass. Indeed, the bare mass can be determined either by the Betti
number $\beta_0$ or by the Betti number $\beta_1$ of the network. We provide
numerical results on the mass of different networks, including random graphs,
scale-free, and real weighted collaboration networks. We also discuss the
generalization of these results to higher-order networks, defining the mass of
simplicial complexes. The observed dependence of the mass of the considered
topological Dirac field with the topology and geometry of the network could
lead to interesting physics in the scenario in which the considered Dirac field
is coupled with a dynamical evolution of the underlying network structure.
Spin waves, collective dynamic magnetic excitations, offer crucial insights
into magnetic material properties. Rare-earth iron garnets offer an ideal
spin-wave (SW) platform with long propagation length, short wavelength,
gigahertz frequency, and applicability to magnon spintronic platforms. Of
particular interest, thulium iron garnet (TmIG) has attracted a huge interest
recently due to its successful growth down to a few nanometers, observed
topological Hall effect and spin orbit torque-induced switching effects.
However, there is no direct spatial measurement of its SW properties. This work
uses diamond nitrogen vacancy (NV) magnetometry in combination with SW
electrical transmission spectroscopy to study SW transport properties in TmIG
thin films. NV magnetometry allows probing spin waves at the sub-micrometer
scale, seen by the amplification of the local microwave magnetic field due to
the coupling of NV spin qubits with the stray magnetic field produced by the
microwave-excited spin waves. By monitoring the NV spin resonances, the SW
properties in TmIG thin films are measured as function of the applied magnetic
field, including their amplitude, decay length (~ 50 um), and wavelength (0.8 -
2 um). These results pave the way for studying spin qubit-magnon interactions
in rare-earth magnetic insulators, relevant to quantum magnonics applications.
This study theoretically predicts the specific Polycyclic Aromatic
Hydrocarbon (PAH) molecules to reproduce both astronomically observed Infrared
Bands (IR) and Diffuse Interstellar Bands (DIB). In our recent paper, we could
reproduce IR by the hydrocarbon pentagon-hexagon combined PAH molecules using
Density Functional Theory (DFT). Found molecules were (C53H18), and (C23H12)
with two carbon pentagons among hexagon networks. Origin of DIB may come from
the molecular orbital excitation. We applied Time-Dependent DFT calculation. In
case of (C53H18), by comparing calculation with observed DIB, we found 7
coincide bands among 42 calculated bands within observed band width. For
example, neutral (C53H18) shows calculated 577.35nm band coincide well with
observed DIB at 577.95nm within 1.55nm observed band width. Mono-cation shows
calculated 627.87nm correspond to observed 627.83nm, also for di-cation
calculated 635.89nm to observed 635.95nm. For smaller size molecule (C23H12),
we found 5 coincide bands, of which mono-cation shows calculated 713.92nm
coincide with observed 713.80nm, di-cation shows calculated 653.27nm correlate
to observed 653.21nm. By such quantum-chemical survey, we could predict
specific PAH molecules floating in interstellar space.
It has recently been understood that the complete global symmetry of finite
group topological gauge theories contains the structure of a higher-group. Here
we study the higher-group structure in (3+1)D $\mathbb{Z}_2$ gauge theory with
an emergent fermion, and point out that pumping chiral $p+ip$ topological
states gives rise to a $\mathbb{Z}_{8}$ 0-form symmetry with mixed
gravitational anomaly. This ordinary symmetry mixes with the other higher
symmetries to form a 3-group structure, which we examine in detail. We then
show that in the context of stabilizer quantum codes, one can obtain logical
CCZ and CS gates by placing the code on a discretization of $T^3$ (3-torus) and
$T^2 \rtimes_{C_2} S^1$ (2-torus bundle over the circle) respectively, and
pumping $p+ip$ states. Our considerations also imply the possibility of a
logical $T$ gate by placing the code on $\mathbb{RP}^3$ and pumping a $p+ip$
topological state.
Topological quantum materials can exhibit unconventional surface states and
anomalous transport properties, but their applications to spintronic devices
are restricted as they require the growth of high-quality thin films with
bulk-like properties. Here, we study 10--30 nm thick epitaxial ferromagnetic
Co$_{\rm 2}$MnGa films with high structural order. Very high values of the
anomalous Hall conductivity, $\sigma_{\rm xy}=1.35\times10^{5}$ $\Omega^{-1}
m^{-1}$, and the anomalous Hall angle, $\theta_{\rm H}=15.8\%$, both comparable
to bulk values. We observe a dramatic crystalline orientation dependence of the
Gilbert damping constant of a factor of two and a giant intrinsic spin Hall
conductivity, $\mathit{\sigma_{\rm SHC}}=(6.08\pm 0.02)\times 10^{5}$
($\hbar/2e$) $\Omega^{-1} m^{-1}$, which is an order of magnitude higher than
literature values of single-layer Ni$_{\rm 80}$Fe$_{\rm 20}$, Ni, Co, Fe, and
multilayer Co$_{\rm 2}$MnGa stacks. Theoretical calculations of the intrinsic
spin Hall conductivity, originating from a strong Berry curvature, corroborate
the results and yield values comparable to the experiment. Our results open up
for the design of spintronic devices based on single layers of topological
quantum materials.

Date of feed: Thu, 23 Nov 2023 01:30:00 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) **Edge-pinning effect of graphene nanoflakes sliding atop graphene. (arXiv:2311.12853v1 [cond-mat.mtrl-sci])**

Yingchao Liu, Jinlong Ren, Decheng Kong, Guangcun Shan, Kunpeng Dou

**Moir\'e Fractional Chern Insulators II: First-principles Calculations and Continuum Models of Rhombohedral Graphene Superlattices. (arXiv:2311.12920v1 [cond-mat.mes-hall])**

Jonah Herzog-Arbeitman, Yuzhi Wang, Jiaxuan Liu, Pok Man Tam, Ziyue Qi, Yujin Jia, Dmitri K. Efetov, Oskar Vafek, Nicolas Regnault, Hongming Weng, Quansheng Wu, B. Andrei Bernevig, Jiabin Yu

**Controlled expansion for transport in a class of non-Fermi liquids. (arXiv:2311.12922v1 [cond-mat.str-el])**

Zhengyan Darius Shi

**Spectroscopy of a single-carrier bilayer graphene quantum dot from time-resolved charge detection. (arXiv:2311.12949v1 [cond-mat.mes-hall])**

Hadrien Duprez, Solenn Cances, Andraz Omahen, Michele Masseroni, Max J. Ruckriegel, Christoph Adam, Chuyao Tong, Jonas Gerber, Rebekka Garreis, Wister Huang, Lisa Gächter, Takashi Taniguchi, Kenji Watanabe, Thomas Ihn, Klaus Ensslin

**Mechanistic Insights into the Hydrazine-induced Chemical Reduction Pathway of Graphene Oxide. (arXiv:2311.13086v1 [cond-mat.dis-nn])**

Shu Chen, Jianqiang Guo

**Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications. (arXiv:2311.13098v1 [cond-mat.mes-hall])**

Yuri D Glinka

**Magneto-structural phase transitions and two-dimensional spin waves in graphite. (arXiv:2311.13116v1 [cond-mat.supr-con])**

Nadina Gheorghiu, Charles R. Ebbing, Timothy J. Haugan

**Inducing a Tunable Skyrmion-Antiskyrmion System through Ion Beam Modification of FeGe Films. (arXiv:2311.13130v1 [cond-mat.mtrl-sci])**

M. B. Venuti, Xiyue S. Zhang, Eric J Lang, Sadhvikas J. Addamane, Hanjong Paik, Portia Allen, Peter Sharma, David Muller, Khalid Hattar, Tzu-Ming Lu, Serena Eley

**Bulk--boundary correspondence in a non-Hermitian quantum spin-Hall insulator. (arXiv:2311.13142v1 [cond-mat.mes-hall])**

Chihiro Ishii, Yositake Takane

**Fractional quantum Hall interface induced by geometric singularity. (arXiv:2311.13181v1 [cond-mat.mes-hall])**

Qi Li, Yi Yang, Zhou Li, Hao Wang, Zi-Xiang Hu

**Engineering magnetic domain wall energies in multiferroic BiFeO$_3$ via epitaxial strain. (arXiv:2311.13215v1 [cond-mat.mtrl-sci])**

Sebastian Meyer, Bin Xu, Laurent Bellaiche, Bertrand Dupé

**Controllable orbital angular momentum monopoles in chiral topological semimetals. (arXiv:2311.13217v1 [cond-mat.str-el])**

Yun Yen, Jonas A. Krieger, Mengyu Yao, Iñigo Robredo, Kaustuv Manna, Qun Yang, Emily C. McFarlane, Chandra Shekhar, Horst Borrmann, Samuel Stolz, Roland Widmer, Oliver Gröning, Vladimir N. Strocov, Stuart S. P. Parkin, Claudia Felser, Maia G. Vergniory, Michael Schüler, Niels B. M. Schröter

**Microstructured organic cavities with high-reflective flat reflectors fabricated by using a nanoimprint-bonding process. (arXiv:2311.13248v1 [physics.optics])**

Takuya Enna, Yuji Adachi, Tsukasa Hirao, Shun Takahashi, Yohei Yamamoto, Kenichi Yamashita

**Kardar-Parisi-Zhang fluctuations in the synchronization dynamics of limit-cycle oscillators. (arXiv:2311.13253v1 [cond-mat.stat-mech])**

Ricardo Gutiérrez, Rodolfo Cuerno

**Buildup and dephasing of Floquet-Bloch bands on subcycle time scales. (arXiv:2311.13309v1 [cond-mat.mes-hall])**

S. Ito, M. Schüler, M. Meierhofer, S. Schlauderer, J. Freudenstein, J. Reimann, D. Afanasiev, K. A. Kokh, O. E. Tereshchenko, J. Güdde, M. A. Sentef, U. Höfer, R. Huber

**Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe$_5$. (arXiv:2311.13346v1 [cond-mat.mes-hall])**

Dong Xing, Bingbing Tong, Senyang Pan, Zezhi Wang, Jianlin Luo, Jinglei Zhang, Cheng-Long Zhang

**Wetting and Strain Engineering of 2D Materials on Nanopatterned Substrates. (arXiv:2311.13399v1 [cond-mat.mes-hall])**

Davoud Adinehloo, Joshua R. Hendrickson, Vasili Perebeinos

**Triple-sinusoid hedgehog lattice in a centrosymmetric Kondo metal. (arXiv:2311.13405v1 [cond-mat.str-el])**

Soohyeon Shin, Jin-Hong Park, Romain Sibille, Harim Jang, Tae Beom Park, Suyoung Kim, Tian Shang, Marisa Medarde, Eric D. Bauer, Oksana Zaharko, Michel Kenzelmann, Tuson Park

**State Diagrams to determine Tree Tensor Network Operators. (arXiv:2311.13433v1 [quant-ph])**

Richard M. Milbradt, Qunsheng Huang, Christian B. Mendl

**Variable-temperature lightwave-driven scanning tunneling microscope with a compact, turn-key terahertz source. (arXiv:2311.13456v1 [cond-mat.mes-hall])**

Hüseyin Azazoglu, Philip Kapitza, Martin Mittendorff, Rolf Möller, Manuel Gruber

**Controlling crystal cleavage in Focused Ion Beam shaped specimens for surface spectroscopy. (arXiv:2311.13458v1 [cond-mat.mtrl-sci])**

A. Hunter, C. Putzke, I. Gaponenko, A. Tamai, F. Baumberger, P.J.W. Moll

**Exploring Seiberg-like Dualities with Eight Supercharges. (arXiv:2210.04921v4 [hep-th] UPDATED)**

Anindya Dey

**Pair-Kondo effect: a mechanism for time-reversal broken superconductivity in UTe$_2$. (arXiv:2210.16293v2 [cond-mat.supr-con] UPDATED)**

Tamaghna Hazra, Pavel A. Volkov

**Full Classification of Transport on an Equilibrated 5/2 Edge via Shot Noise. (arXiv:2212.05732v3 [cond-mat.mes-hall] UPDATED)**

Sourav Manna, Ankur Das, Moshe Goldstein, Yuval Gefen

**Evidence for three-dimensional Dirac semimetal state in strongly correlated organic quasi-two-dimensional material. (arXiv:2302.05616v2 [cond-mat.str-el] UPDATED)**

Naoya Tajima, Yoshitaka Kawasugi, Takao Morinari, Ryuhei Oka, Toshio Naito, Reizo Kato

**Extracting higher central charge from a single wave function. (arXiv:2303.04822v4 [cond-mat.str-el] UPDATED)**

Ryohei Kobayashi, Taige Wang, Tomohiro Soejima, Roger S. K. Mong, Shinsei Ryu

**Anomalous second-order skin modes in Floquet non-Hermitian systems. (arXiv:2303.11259v2 [cond-mat.mes-hall] UPDATED)**

Chun-Hui Liu, Haiping Hu, Shu Chen, Xiong-Jun Liu

**Edge-selective extremal damping from topological heritage of dissipative Chern insulators. (arXiv:2304.09040v2 [cond-mat.mes-hall] UPDATED)**

Suraj S. Hegde, Toni Ehmcke, Tobias Meng

**Roses in the Nonperturbative Current Response of Artificial Crystals. (arXiv:2305.03013v2 [cond-mat.mes-hall] UPDATED)**

Christophe De Beule, Vo Tien Phong, E. J. Mele

**Topological interface states -- a possible path towards a Landau-level laser in the THz regime. (arXiv:2307.05116v4 [cond-mat.mes-hall] UPDATED)**

Mark O. Goerbig

**Spin-Peierls instability of the U(1) Dirac spin liquid. (arXiv:2307.12295v3 [cond-mat.str-el] UPDATED)**

Urban F. P. Seifert, Josef Willsher, Markus Drescher, Frank Pollmann, Johannes Knolle

**The mass of simple and higher-order networks. (arXiv:2309.07851v3 [cond-mat.dis-nn] UPDATED)**

Ginestra Bianconi

**Mapping of Spin-Wave Transport in Thulium Iron Garnet Thin Films Using Diamond Quantum Microscopy. (arXiv:2310.06188v3 [cond-mat.mes-hall] UPDATED)**

Rupak Timalsina, Haohan Wang, Bharat Giri, Adam Erickson, Xiaoshan Xu, Abdelghani Laraoui

**Astronomical Infrared Bands and Diffuse Interstellar Bands Both Reproduced by Hydrocarbon Pentagon-Hexagon Combined PAH Molecules. (arXiv:2310.06264v2 [astro-ph.GA] UPDATED)**

Norio Ota

**Higher-group symmetry of (3+1)D fermionic $\mathbb{Z}_2$ gauge theory: logical CCZ, CS, and T gates from higher symmetry. (arXiv:2311.05674v2 [cond-mat.str-el] UPDATED)**

Maissam Barkeshli, Po-Shen Hsin, Ryohei Kobayashi

**Berry curvature induced giant intrinsic spin-orbit torque in single layer magnetic Weyl semimetal thin films. (arXiv:2311.08145v2 [cond-mat.mes-hall] UPDATED)**

Lakhan Bainsla, Yuya Sakuraba, Keisuke Masuda, Akash Kumar, Ahmad A. Awad, Nilamani Behera, Roman Khymyn, Saroj Prasad Dash, Johan Åkerman

Found 10 papers in prb The optical control of crystal structures is a promising route to change physical properties including the topological nature of a targeting material. Time-resolved x-ray diffraction measurements using an x-ray free-electron laser are performed to study the ultrafast lattice dynamics of ${\mathrm{VT… The conventional spin proximity effect is normally pictured in terms of a small spin splitting of the bands of a nonmagnetic material, due to exchange coupling to a ferromagnet. In this work, the authors show a different type of proximity mechanism, where only one spin channel in the nonmagnetic material becomes strongly hybridized with the ferromagnet, whereas the other remains unaffected. In the case of graphene coupled to CrI${}_{3}$, a ferromagnetic insulator, the authors show that the hybridization proximity is both strong and electrically tunable. Using scanning tunneling microscopy, we investigate the superconductivity and vortex properties in topological insulator ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$ thin films grown on the iron-based superconductor ${\mathrm{FeTe}}_{0.55}{\mathrm{Se}}_{0.45}$. The proximity-induced superconductivity weaken… The occupied electron energy bands of monolayer ${\mathrm{MoS}}_{2}$ are composed from out-of-plane $d$ orbitals at the Brillouin zone (BZ) center and from in-plane $d$ orbitals at the BZ corner. If a dopant would interact in an orbital selective manner with the ${\mathrm{MoS}}_{2}$ bands, it could … Using computational and experimental techniques, we examine the nature of the $+2$ oxidation of titanium (Ti)-doped CdSe. Through stoichiometry and confirmed through magnetization measurements, the weakly doped ${\mathrm{Cd}}_{1−x}{\mathrm{Ti}}_{x}\mathrm{Se}$ $(x=0.000\phantom{\rule{0.16em}{0ex}}43… Gapless helical edge modes are a hallmark of the quantum spin Hall effect. Protected by time-reversal symmetry, each edge contributes a quantized zero-temperature conductance quantum ${G}_{0}≡{e}^{2}/h$. However, the experimentally observed conductance in ${\mathrm{WTe}}_{2}$ decreases below ${G}_{0… Topological phases have become an enabling role in exploiting new applications of nonlinear optics in recent years. Here we theoretically propose a valley photonic crystal resonator emulating topologically protected dissipative Kerr soliton combs. It is shown that topological resonator modes can be … The correlation between the photoluminescence properties and excited state dynamics of perylene $({\mathrm{C}}_{20}{\mathrm{H}}_{12})$ formed on a graphite (0001) substrate was investigated at the monolayer limit. Time-resolved two-photon photoemission spectroscopy was used to evaluate the lifetime … We find a class of Floquet topological phases exhibiting gap-dependent topological classifications in quantum systems with a dynamical space-time symmetry and an antisymmetry. This is in contrast to all existing Floquet topological phases protected by static symmetries, where the topological classi… By means of density functional theory and constrained random phase approximation we analyze the band structure of ${\mathrm{Pb}}_{9}\mathrm{Cu}{({\mathrm{PO}}_{4})}_{6}\mathrm{O}$ (named LK-99). Our data show that the lead-phosphate apatite LK-99 in the proposed Cu-doped structure is a semiconductor…

Date of feed: Thu, 23 Nov 2023 04:17:16 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) **Ultrafast control of the crystal structure in a topological charge-density-wave material**

Takeshi Suzuki, Yuya Kubota, Natsuki Mitsuishi, Shunsuke Akatsuka, Jumpei Koga, Masato Sakano, Satoru Masubuchi, Yoshikazu Tanaka, Tadashi Togashi, Hiroyuki Ohsumi, Kenji Tamasaku, Makina Yabashi, Hidefumi Takahashi, Shintaro Ishiwata, Tomoki Machida, Iwao Matsuda, Kyoko Ishizaka, and Kozo Okazaki

Author(s): Takeshi Suzuki, Yuya Kubota, Natsuki Mitsuishi, Shunsuke Akatsuka, Jumpei Koga, Masato Sakano, Satoru Masubuchi, Yoshikazu Tanaka, Tadashi Togashi, Hiroyuki Ohsumi, Kenji Tamasaku, Makina Yabashi, Hidefumi Takahashi, Shintaro Ishiwata, Tomoki Machida, Iwao Matsuda, Kyoko Ishizaka, and Kozo Okazaki

[Phys. Rev. B 108, 184305] Published Wed Nov 22, 2023

**Strong magnetic proximity effect in van der Waals heterostructures driven by direct hybridization**

C. Cardoso, A. T. Costa, A. H. MacDonald, and J. Fernández-Rossier

Author(s): C. Cardoso, A. T. Costa, A. H. MacDonald, and J. Fernández-Rossier

[Phys. Rev. B 108, 184423] Published Wed Nov 22, 2023

**Superconductivity and vortex structure in ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}/{\mathrm{FeTe}}_{0.55}{\mathrm{Se}}_{0.45}$ heterostructures with varying ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$ thickness**

Kailun Chen, Mingyang Chen, Chuanhao Wen, Zhiyong Hou, Huan Yang, and Hai-Hu Wen

Author(s): Kailun Chen, Mingyang Chen, Chuanhao Wen, Zhiyong Hou, Huan Yang, and Hai-Hu Wen

[Phys. Rev. B 108, 184512] Published Wed Nov 22, 2023

**Orbital-selective chemical functionalization of ${\text{MoS}}_{2}$ by $\mathrm{Fe}$**

Niels Ehlen, Yannic Falke, Boris V. Senkovskiy, Timo Knispel, Jeison Fischer, Oliver N. Gallego, Cesare Tresca, Maximilian Buchta, Konstantin P. Shchukin, Alessandro D'Elia, Giovanni Di Santo, Luca Petaccia, Dmitry Smirnov, Anna Makarova, Gianni Profeta, Thomas Michely, and Alexander Grüneis

Author(s): Niels Ehlen, Yannic Falke, Boris V. Senkovskiy, Timo Knispel, Jeison Fischer, Oliver N. Gallego, Cesare Tresca, Maximilian Buchta, Konstantin P. Shchukin, Alessandro D'Elia, Giovanni Di Santo, Luca Petaccia, Dmitry Smirnov, Anna Makarova, Gianni Profeta, Thomas Michely, and Alexander Grüneis

[Phys. Rev. B 108, 195430] Published Wed Nov 22, 2023

**Investigation of a $+2$ oxidation spin state in weakly doped ${\mathrm{Cd}}_{1−x}{\mathrm{Ti}}_{x}\mathrm{Se}$**

J. Dimuna, T. Boyett, I. Miotkowski, A. K. Ramdas, T. M. Pekarek, and J. T. Haraldsen

Author(s): J. Dimuna, T. Boyett, I. Miotkowski, A. K. Ramdas, T. M. Pekarek, and J. T. Haraldsen

[Phys. Rev. B 108, 205202] Published Wed Nov 22, 2023

**Breakdown of helical edge state topologically protected conductance in time-reversal-breaking excitonic insulators**

Yan-Qi Wang, Michał Papaj, and Joel E. Moore

Author(s): Yan-Qi Wang, Michał Papaj, and Joel E. Moore

[Phys. Rev. B 108, 205420] Published Wed Nov 22, 2023

**Topological dissipative Kerr soliton combs in a valley photonic crystal resonator**

Zhen Jiang, Lefeng Zhou, Wei Li, Yudong Li, Liangsen Feng, Tengfei Wu, Chun Jiang, and Guangqiang He

Author(s): Zhen Jiang, Lefeng Zhou, Wei Li, Yudong Li, Liangsen Feng, Tengfei Wu, Chun Jiang, and Guangqiang He

[Phys. Rev. B 108, 205421] Published Wed Nov 22, 2023

**Photoluminescence properties and excited state dynamics of monolayer perylene on graphite (0001)**

Takashi Yamada

Author(s): Takashi Yamada

[Phys. Rev. B 108, 205422] Published Wed Nov 22, 2023

**Floquet gap-dependent topological classifications from color-decorated frequency lattices with space-time symmetries**

Ilyoun Na, Jack Kemp, Sinéad M. Griffin, Robert-Jan Slager, and Yang Peng

Author(s): Ilyoun Na, Jack Kemp, Sinéad M. Griffin, Robert-Jan Slager, and Yang Peng

[Phys. Rev. B 108, L180302] Published Wed Nov 22, 2023

**${\mathrm{Pb}}_{9}{\mathrm{Cu}({\mathrm{PO}}_{4})}_{6}\mathrm{O}$ is a charge-transfer semiconductor**

Lorenzo Celiberti, Lorenzo Varrassi, and Cesare Franchini

Author(s): Lorenzo Celiberti, Lorenzo Varrassi, and Cesare Franchini

[Phys. Rev. B 108, L201117] Published Wed Nov 22, 2023

Found 3 papers in prl We use a result of Hawking and Gilkey to define a Euclidean path integral of gravity and matter which has the special property of being independent of the choice of basis in the space of fields. This property allows the path integral to also describe physical regimes that do not admit position bases… Photonic topological insulators exhibit bulk-boundary correspondence, which requires that boundary-localized states appear at the interface formed between topologically distinct insulating materials. However, many topological photonic devices share a boundary with free space, which raises a subtle b… Liquids near the glass transition exhibit dynamical heterogeneity, i.e., local relaxation rates fluctuate strongly over space and time. Here, we introduce a simple continuum model that allows for quantitative predictions for the correlators describing these fluctuations. We find remarkable agreement…

Date of feed: Thu, 23 Nov 2023 04:17:18 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) **Model for Emergence of Spacetime from Fluctuations**

Marcus Reitz, Barbara Šoda, and Achim Kempf

Author(s): Marcus Reitz, Barbara Šoda, and Achim Kempf

[Phys. Rev. Lett. 131, 211501] Published Wed Nov 22, 2023

**Classifying Topology in Photonic Heterostructures with Gapless Environments**

Kahlil Y. Dixon, Terry A. Loring, and Alexander Cerjan

Author(s): Kahlil Y. Dixon, Terry A. Loring, and Alexander Cerjan

[Phys. Rev. Lett. 131, 213801] Published Wed Nov 22, 2023

**Simple Model for Dynamic Heterogeneity in Glass-Forming Liquids**

Rajib K. Pandit and Horacio E. Castillo

Author(s): Rajib K. Pandit and Horacio E. Castillo

[Phys. Rev. Lett. 131, 218202] Published Wed Nov 22, 2023

Found 1 papers in pr_res A quantum kicked rotor model is one of the promising systems to realize various Floquet topological phases. We consider a double-kicked rotor model for a one-dimensional quasi-spin-1/2 Bose-Einstein condensate with spin-dependent and spin-independent kicks which are implementable for cold atomic exp…

Date of feed: Thu, 23 Nov 2023 04:17:17 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) **Designing nontrivial one-dimensional Floquet topological phases using a spin-1/2 double-kicked rotor**

Yusuke Koyama, Kazuya Fujimoto, Shuta Nakajima, and Yuki Kawaguchi

Author(s): Yusuke Koyama, Kazuya Fujimoto, Shuta Nakajima, and Yuki Kawaguchi

[Phys. Rev. Research 5, 043167] Published Wed Nov 22, 2023