Found 39 papers in cond-mat We provide a mathematical proposal for the anomaly indicators of symmetries
of (2+1)-d fermionic topological orders, and work out the consequences of our
proposal in several nontrivial examples. Our proposal is an invariant of a
super modular tensor category with a fermionic group action, which gives a
(3+1)-d topological field theory (TFT) that we conjecture to be invertible; the
anomaly indicators are partition functions of this TFT on $4$-manifolds
generating the corresponding twisted spin bordism group. Our construction
relies on a bosonization construction due to Gaiotto-Kapustin and
Tata-Kobayashi-Bulmash-Barkeshli, together with a ``bosonization conjecture''
which we explain in detail. In the second half of the paper, we discuss several
examples of our invariants relevant to condensed-matter physics. The most
important example we consider is $\mathbb{Z}/4^T\times \mathbb{Z}/2^f$
time-reversal symmetry with symmetry algebra $\mathcal T^2 = (-1)^FC$, which
many fermionic topological orders enjoy, including the $\mathrm{U}(1)_5$ spin
Chern-Simons theory. Using newly developed tools involving the Smith long exact
sequence, we calculate the cobordism group that classifies its anomaly, present
the generating manifold, and calculate the partition function on the generating
manifold which serves as our anomaly indicator. Our approach allows us to
reproduce anomaly indicators known in the literature with simpler proofs,
including $\mathbb{Z}/4^{Tf}$ time-reversal symmetry with symmetry algebra
$\mathcal T^2 = (-1)^F$, and other symmetry groups in the 10-fold way involving
Lie group symmetries.
Spontaneous symmetry breaking and more recently entanglement are two
cornerstones of quantum matter. We introduce the notion of anisotropic
entanglement ordered phases, where the spatial profile of spin-pseudospin
entanglement spontaneously lowers the four-fold rotational symmetry of the
underlying crystal to a two-fold one, while the charge density retains the full
symmetry. The resulting phases, which we term $\textit{entanglement smectic}$
and $\textit{entanglement stripe}$, exhibit a rich Goldstone mode spectrum and
a set of phase transitions as a function of underlying anisotropies. We discuss
experimental consequences of such anisotropic entanglement phases
distinguishing them from more conventional charge or spin stripes. Our
discussion of this interplay between entanglement and spontaneous symmetry
breaking focuses on multicomponent quantum Hall systems realizing textured
Wigner crystals, as may occur in graphene or possibly also in moir\'e systems,
highlighting the rich landscape and properties of possible entanglement ordered
phases.
Twisted bilayers of nodal superconductors have been recently demonstrated to
be a potential platform to realize two-dimensional topological
superconductivity. Here we study the topological properties of twisted
finite-thickness flakes of nodal superconductors under applied current,
focusing on the case of a $N$-layer flake with a single twisted top layer. At
low current bias and small twist angles, the average nodal topological gap is
reduced with flake thickness as $\sim\mathcal{O}(\frac{1}{N})$, but the Chern
number grows $\sim \mathcal{O}(N)$. As a result, we find the thermal Hall
coefficient to be independent of $N$ at temperatures larger than the nodal gap.
At larger twist angles, we demonstrate that the nodal gap in the density of
states of the top layer is only weakly suppressed, allowing its detection in
scanning tunneling microscopy experiments. These conclusions are demonstrated
numerically in an atomic-scale tight-binding model and analytically through the
model's continuum limit, finding excellent agreement between the two. Finally,
we show that increasing the bias current leads to a sequence of topological
transitions, where the Chern number increases like $\sim\mathcal{O}(N^2)$
beyond the additive effect of stacking $N$ layers. Our results show that
twisted superconductor flakes are "$2.5$-dimensional" materials, allowing to
realize new electronic properties due to synergy between two-dimensional layers
extended to a finite thickness in a third dimension.
We demonstrate that the classical dynamics influence the localization
behaviour of Majorana wavefunctions in Majorana billiards. By using a
connection between Majorana wavefunctions and eigenfunctions of a normal state
Hamiltonian, we show that Majorana wavefunctions in both p-wave and s-wave
topological superconductors inherit the properties of the underlying normal
state eigenfunctions. As an example, we demonstrate that Majorana wavefunctions
in topological superconductors with chaotic shapes feature quantum scarring.
Furthermore, we show a way to manipulate a localized Majorana wavefunction by
altering the underlying classical dynamics using a local potential away from
the localization region. Finally, in the presence of chiral symmetry breaking,
we find that the Majorana wavefunction in convex-shaped Majorana billiards
exhibits caustics formation, reminiscent of a normal state system with magnetic
field.
Motivated by the experiment by M. Budden {\em et al.} [Nature Physics {\bf
17}, 611 (2021)], who observed signatures of long-lived photo-induced
superconductivity, we develop an accurate analytical/computational approach to
non-equilibrium superconductivity following a quench. We consider the
BCS-Holstein model, which includes both integrable local electron-electron
interactions and integrability-breaking electron-phonon coupling. We develop
Keldysh-Eliashberg theory on the Kadanoff-Baym contour, which enables us to
describe non-equilibrium dynamics of the superconductor. We consider a quench
in interactions, which results in a dynamic transition from the initial
superconducting state to a normal thermal state in the end of the evolution. It
is shown that the dynamics contain two stages: The early-time integrable
behavior, involving coherent oscillations of the superconducting order
parameter, crosses over to the late-time ergodic dynamics exhibiting a thermal
decay into an equilibrium state. In the former regime, our computational
approach both reproduces exact analytical results on the integrable dynamics of
the order parameter and generalizes those to the case of an initial thermal
state. The method also succeeds for the first time in describing both
integrable-to-thermalizing crossover and the late-time thermal decay, which is
shown to be consistent with the time-dependent Ginzburg-Landau theory (with the
exponential decay time dependent on the density of quasiparticle excitations).
We observe the electron distribution function approaching the Fermi-Dirac
thermal distribution at final stages. The details of two-time non-equilibrium
dynamics depend on the density of quasiparticles in the initial state and the
integrability-breaking parameters, which under certain conditions may result in
a long-lived transient superconductivity consistent with experiment.
Owing to their large effective mass, strong and tunable spin-orbit coupling,
and complex band-structure, two-dimensional hole systems (2DHSs) in GaAs
quantum wells provide rich platforms to probe exotic many-body physics, while
also offering potential applications in ballistic and spintronics devices, and
fault-tolerant topological quantum computing. We present here a systematic
study of molecular-beam-epitaxy grown, modulation-doped, GaAs (001) 2DHSs where
we explore the limits of low-temperature 2DHS mobility by optimizing two
parameters, the GaAs quantum well width and the alloy fraction ($x$) of the
flanking Al$_x$Ga$_{1-x}$As barriers. We obtain a breakthrough in 2DHS
mobility, with a peak value $\simeq 18 \times 10^6$ cm$^2$/Vs at a density of
3.8 $\times$ 10$^{10}$ /cm$^{2}$, implying a mean-free-path of $\simeq 57
\mu$m. Using transport calculations tailored to our structures, we analyze the
operating scattering mechanisms to explain the non-monotonic evolution of
mobility with density. We find it imperative to include the dependence of
effective mass on 2DHS density, well width, and $x$. We observe concomitant
improvement in quality as evinced by the appearance of delicate fractional
quantum Hall states at very low density.
Lead zirconate titanate (PbZr1-xTixO3, PZT) exhibits excellent piezoelectric
properties in the morphotropic phase boundary (MPB) region of its
temperature-composition phase diagram. However, the microscopic origin of its
high piezoelectric response remains controversial. Here, we develop a
machine-learning-based deep potential (DP) model of PZT using the training
dataset from first principles density functional theory calculations. Based on
DP-assisted large-scale atomic simulations, we reproduce the
temperature-composition phase diagram of PZT, in good agreement with the
experiment except the absence of structural transition from R3c to R3m. We find
that the rhombohedral phase maintains R3c symmetry with slight oxygen
octahedral tilting as increase of temperature, instead of appearing R3m
symmetry. This discrepancy can trace back to the lack of experimental
measurements to identify such slight octahedral tilting. More importantly, we
clarify the atomic-level feature of PZT at the MPB, exhibiting the competing
coupling of ferroelectric nanodomains with various polarization orientations.
The high piezoelectric response is driven by polarization rotation of
nanodomains induced by an external electric field.
Quantum electrodynamics (QED) is a cornerstone of particle physics and also
finds diverse applications in condensed matter systems. Despite its
significance, the dynamics of quantum electrodynamics under a quantum quench
remains inadequately explored. In this paper, we investigate the nonequilibrium
regime of quantum electrodynamics following a global quantum quench.
Specifically, a massive Dirac fermion is quenched to a gapless state with an
interaction with gauge bosons. In stark contrast to equilibrium
(3+1)-dimensional QED with gapless Dirac fermions, where the coupling is
marginally irrelevant, we identify a nonequilibrium fixed point characterized
by nonFermi liquid behavior. Notably, the anomalous dimension at this fixed
point varies with the initial quench parameter, suggesting an interesting
quantum memory effect in a strongly interacting system. Additionally, we
propose distinctive experimental signatures for nonequilibrium quantum
electrodynamics.
This molecular orbital analysis predicts that pure carbon graphene molecules
would play an important role on astronomically observed Diffuse Interstellar
Bands (DIB), rather than fullerene. Laboratory experiments precisely coincided
with observed DIB bands as studied by E. Cambell et al., which were considered
to originate from mono-cation fullerene-(C$_{60}$)$^{1+}$. To check
theoretically a molecular orbital excitation of (C$_{60}$)$^{1+}$ was
calculated by the Time-Dependent DFT. Calculated two bands were close to
observed DIBs, but there were two problems, that the oscillator strength was
zero, and that other three DIBs could not be reproduced. Laboratory experiments
was the mass spectroscopic one filtering m/e=724, to suggest
fullerene-(C$_{60}$)$^{1+}$ combined with He. However, there were other
capabilities, as like He-atom intercalated 3D-graphite,
[graphene(C$_{53}$)$^{1+}$--He--(C$_7$)],
[graphene(C$_{51}$)$^{1+}$--He--(C$_9$)] and so on. A family of graphene
(C$_{53}$), (C$_{52}$) and (C$_{51}$) was calculated. Results show that an
astronomically observed 957.74nm band was reproduced well by calculated
957.74nm, also confirmed by laboratory experiment of 957.75nm. Other observed
963.26, 936.57 and 934.85nm bands were calculated to be 963.08, 935.89 and
933.72nm. Moreover, experimental 922.27nm band was calculated to be 922.02nm,
which is not yet astronomically observed. Similarly, experimental 925.96,
912.80, 909.71 and 908.40nm bands were calculated to 926.01, 912.52, 910.32 and
908.55nm. It should be emphasized that graphene molecules may be ubiquitously
floating in interstellar space.
The anomalous Floquet Anderson insulator (AFAI) has been theoretically
predicted in step-wise periodically driven models, but its stability under more
general driving protocols hasn't been determined. We show that adding disorder
to the anomalous Floquet topological insulator realized with a continuous
driving protocol in the experiment by K. Wintersperger et. al., Nat. Phys.
$\textbf{16}$, 1058 (2020), supports an AFAI phase, where, for a range of
disorder strengths, all the time averaged bulk states become localized, while
the pumped charge in a Laughlin pump setup remains quantized.
Identifying topological phases for a strongly correlated theory remains a
non-trivial task, as defining order parameters, such as Berry phases, is not
straightforward. Quantum information theory is capable of identifying
topological phases for a theory that exhibits quantum phase transition with a
suitable definition of order parameters that are related to different
entanglement measures for the system. In this work, we study entanglement
entropy for a bi-layer SSH model, both in the presence and absence of Hubbard
interaction and at varying interaction strengths. For the free theory, edge
entanglement acts as an order parameter, which is supported by analytic
calculations and numerical (DMRG) studies. We calculate the symmetry-resolved
entanglement and demonstrate the equipartition of entanglement for this model
which itself acts as an order parameter when calculated for the edge modes. As
the DMRG calculation allows one to go beyond the free theory, we study the
entanglement structure of the edge modes in the presence of on-site Hubbard
interaction for the same model. A sudden reduction of edge entanglement is
obtained as interaction is switched on. The explanation for this lies in the
change in the size of the degenerate subspaces in the presence and absence of
interaction. We also study the signature of entanglement when the interaction
strength becomes extremely strong and demonstrate that the edge entanglement
remains protected. In this limit, the energy eigenstates essentially become a
tensor product state, implying zero entanglement. However, a remnant entropy
survives in the non-trivial topological phase which is exactly due to the
entanglement of the edge modes.
The recent discovery of superconductivity and magnetism in trilayer
rhombohedral graphene (RG) establishes an ideal, untwisted platform to study
strong correlation electronic phenomena. However, the correlated effects in
multilayer RG have received limited attention, and, particularly, the evolution
of the correlations with increasing layer number remains an unresolved
question. Here, we show the observation of layer-dependent electronic
structures and correlations in RG multilayers from 3 to 9 layers by using
scanning tunneling microscopy and spectroscopy. We explicitly determine
layer-enhanced low-energy flat bands and interlayer coupling strength. The
former directly demonstrates the further flattening of low-energy bands in
thicker RG, and the later indicates the presence of varying interlayer
interactions in RG multilayers. Moreover, we find significant splitting of the
flat bands, ranging from ~50-80 meV, under liquid nitrogen temperature when
they are partially filled, indicating the emergence of interaction-induced
strongly correlated states. Particularly, the strength of the correlated states
is notably enhanced in thicker RG and reaches its maximum in the six-layer,
validating directly theoretical predictions and establishing abundant new
candidates for strongly correlated systems. Our results provide valuable
insights into the layer dependence of the electronic properties in RG, paving
the way for investigating robust and highly accessible correlated phases in
simpler systems.
We study post-quench dynamics of charge-density-wave (CDW) order in the
square-lattice $t$-$V$ model. The ground state of this system at half-filling
is characterized by a checkerboard modulation of particle density. A
generalized self-consistent mean-field method, based on the time-dependent
variational principle, is employed to describe the dynamical evolution of the
CDW states. Assuming a homogeneous CDW order throughout the quench process, the
time-dependent mean-field approach is reduced to the Anderson pseudospin
method. Quench simulations based on the Bloch equation for pseudospins produce
three canonical behaviors of order-parameter dynamics: phase-locked persistent
oscillation, Landau-damped oscillation, and dynamical vanishing of the CDW
order. We further develop an efficient real-space von Neumann equation method
to incorporate dynamical inhomogeneity into simulations of quantum quenches.
Our large-scale simulations uncover complex pattern formations in the
post-quench CDW states, especially in the strong quench regime. The emergent
spatial textures are characterized by super density modulations on top of the
short-period checkerboard CDW order. Our demonstration of pattern formation in
quenched CDW states, described by a simple broken $Z_2$ symmetry, underscores
the importance of dynamical inhomogeneity in quantum quenches of many-body
systems with more complex orders.
The integration of topological concepts into electronic energy band theory
has been a transformative development in condensed matter physics. Since then,
this paradigm has broadened its reach, extending to a variety of physical
systems, including open ones. In this study, we employ analogues of the
generalized $n$-dimensional Su-Schrieffer-Heeger model, a cornerstone in
understanding topological insulators and higher-order topological states, to
unveil a dimensional hierarchy of topological states within thermal diffusive
networks. Unlike their electronic counterparts, the topological states in these
networks are characterized by confined temperature profiles of dimension
$(n-d)$ with constant diffusive rates, where $n$ represents the system's
dimension and $d$ is the order of the topological state. Our findings
demonstrate the existence of topological corner states in thermal diffusive
systems up to $n=3$, along with surface and hinge states. We also identify and
discuss an intermediate-order topological phase in the case $n=3$,
characterized by the presence of hinge states but the absence of corner states.
Furthermore, our work delves into the influence of chiral symmetry in these
thermal networks, particularly focusing on topological thermal states with a
near-zero diffusion rate. This research lays the foundation for advanced
thermal management strategies that utilize topological states in multiple
dimensions.
In Westminster Abbey, in a nave near to Newton's monument, lies a memorial
stone to Paul Dirac. The inscription on the stone includes the relativistic
wave equation for an electron: the Dirac equation. At the turn of the 21st
century, it was discovered that this eponymous equation was not simply the
preserve of particle physics. The isolation of graphene by Andre Geim and
Konstantin Novoselov in Manchester led to the exploration of a novel class of
materials - Dirac materials - whose electrons behave like Dirac particles.
While the mobility of these quasi-relativistic electrons is attractive from the
perspective of potential ultrafast devices, it also presents a distinct
challenge: how to confine Dirac particles so as to avoid making inherently
leaky devices? Here we discuss the unconventional quantum tunnelling of Dirac
particles, we explain a strategy to create bound states electrostatically, and
we briefly review some pioneering experiments seeking to trap Dirac electrons.
We study the $2d$ chiral Gross-Neveu model at finite temperature $T$ and
chemical potential $\mu$. The analysis is performed by relating the theory to a
$SU(N)\times U(1)$ Wess-Zumino-Witten model with appropriate levels and global
identifications necessary to keep track of the fermion spin structures. We
study the two-point function of a certain composite fermion operator which
allows us to determine the remnants for $T>0$ of the inhomogeneous chiral phase
configuration found for any $N$ at $T=0$. The inhomogeneous configuration
decays exponentially at large distances for anti-periodic fermions while, as a
consequence of a certain $\mathbb{Z}_2$-valued 't Hooft anomaly, it persists
for any $T>0$ and $\mu$ for periodic fermions. A large $N$ analysis confirms
the above findings.
By virtue of their open network structures and low densities, metal--organic
frameworks (MOFs) are soft materials that exhibit elastic instabilities at low
applied stresses. The conventional strategy for improving elastic stability is
to increase the connectivity of the underlying MOF network, which necessarily
increases material density and reduces porosity. Here we demonstrate an
alternative paradigm, whereby elastic stability is enhanced in a MOF with an
aperiodic network topology. We use a combination of variable-pressure
single-crystal X-ray diffraction measurements and coarse-grained
lattice-dynamical calculations to interrogate the high-pressure behaviour of
the topologically aperiodic system TRUMOF-1, which we compare against that of
its ordered congener MOF-5. We show that the topology of the former quenches
the elastic instability responsible for pressure-induced framework collapse in
the latter, much as irregularity in the shapes and sizes of stones acts to
prevent cooperative mechanical failure in drystone walls. Our results establish
aperiodicity as a counterintuitive design motif in engineering the mechanical
properties of framework structures, relevant to MOFs and larger-scale
architectures alike.
Topological phase transitions in band models are usually associated to the
gap closing between the highest valance band and the lowest conduction band,
which can give rise to different types of nodal structures, such as Dirac/Weyl
points, lines and surfaces. In this work, we show the existence of a different
kind of topological phase transitions in one-dimensional systems, which are
instead characterized by the presence of a robust zero indirect gap, which
occurs when the top of the valence band coincides with the bottom of the
conduction band in energy but not in momentum. More specifically, we consider
an one-dimensional model on a diamond-like chain that is protected by both
particle-hole and chiral-inversion symmetries. At the critical point, the
system supports a Dirac-like point. After introducing a deforming parameter
that breaks both inversion and chiral symmetries but preserves their
combination, we observe the emergence of a zero indirect band gap, which
results to be related to the persymmetry of our Hamiltonian. Importantly, the
zero indirect gap holds for a range of values of the deforming parameter. We
finally discuss the implementation of the deforming parameter in our
tight-binding model through time-periodic (Floquet) driving.
Quantum transport properties in molecularly thin perovskite/graphene
heterostructure are experimentally investigated by Shubnikov-de Hass (SdH)
oscillation and photo-resistance spectroscopy. We find an efficient charge
transfer between the perovskite nanosheets and graphene, with a high hole
concentration in graphene of up to $\rm \sim 2.8 \times 10^{13}\ cm^{-2}$. The
perovskite layer also increases Fermi velocity lowering the effective mass of
graphene from expected $\rm \sim 0.12\ m_e$ to $\rm \sim 0.08\ m_e$. Combining
magneto-resistance and density functional theory calculations, we find that the
carrier density in graphene significantly depends on the perovskite termination
at the interface, affecting the charge transfer process and leading to a
coexistence of regions with different doping. We also investigate the
photo-response of the SdH oscillation under illumination. Using
photo-resistance spectroscopy, we find evidence of photo-assisted transport
across the perovskite layer between two graphene electrodes mediated by hot
carriers in perovskite. Our results provide a picture to understand the
transport behavior of 2D perovskite/graphene heterostructure and a reference
for the controlled design of interfaces in perovskite optoelectronic devices.
Monolayers of transition metal dichalcogenides (TMDC) became one of the most
studied nanostructures in the last decade. Combining two different TMDC
monolayers results in a heterostructure whose properties can be individually
tuned by the twist angle between the lattices of the two van-der-Waals layers
and the relative placement of the layers, leading to Moir\'e cells. For small
twist angles, lattice reconstruction leads to strong strain fields in the
Moir\'e cells. In this paper, we combine an existing theory for lattice
reconstruction with a quantum dynamic theory for interlayer excitons and their
dynamics due to exciton phonon scattering using a polaron transformation. The
exciton theory is formulated in real space instead of the commonly used
quasi-momentum space to account for imperfections in the heterolayer breaking
lattice translational symmetry. We can analyze the structure of the localized
and delocalized exciton states and their exciton-phonon scattering rates for
single phonon processes using Born-Markov approximation and multi-phonon
processes using a polaron transformation. Furthermore, linear optical spectra
and exciton relaxation Green functions are calculated and discussed.
Magnetic materials host a wealth of nonlinear dynamics, textures, and
topological defects. This is possible due to the competition between strong
nonlinearity and dispersion that act at the atomic scale as well as long-range
interactions. However, these features are difficult to analytically and
numerically study because of the vastly different temporal and spatial scales
involved. Here, we present a pseudo-spectral approach for the Landau-Lifshitz
equation that invokes energy and momentum conservation embodied in the magnon
dispersion relation to accurately describe both atomic and continuum limits.
Furthermore, this approach enables analytical study at every scale. We show the
applicability of this model in both the continuum and atomic limit by
investigating modulational instability and ultrafast evolution of magnetization
due to transient grating, respectively, in a 1D ferromagnetic chain with
perpendicular magnetic anisotropy. This model provides the possibility of
grid-independent multiscale numerical approaches that will enable the
description of singularities within a single framework.
Polaritons are light-matter quasiparticles that govern the optical response
of quantum materials and enable their nanophotonic applications. We have
studied a new type of polaritons arising in magnetized graphene encapsulated in
hexagonal boron nitride (hBN). These polaritons stem from hybridization of
Dirac magnetoexciton modes of graphene with waveguide phonon modes of hBN
crystals. We refer to these quasiparticles as the Landau-phonon polaritons
(LPPs). Using infrared magneto nanoscopy, we imaged LPPs and controlled their
real-space propagation by varying the magnetic field. These LLPs have large
in-plane momenta and are not bound by the conventional optical selection rules,
granting us access to the "forbidden" inter-Landau level transitions (ILTs). We
observed avoided crossings in the LPP dispersion - a hallmark of the strong
coupling regime - occurring when the magnetoexciton and hBN phonon frequencies
matched. Our LPP-based nanoscopy also enabled us to resolve two fundamental
many-body effects: the graphene Fermi velocity renormalization and
ILT-dependent magnetoexciton binding energies. These results indicate that
magnetic-field-tuned Dirac heterostructures are promising platforms for precise
nanoscale control and sensing of light-matter interaction.
In this work, we investigate the topological phase transitions in an
effective model for a topological thin film with high-frequency pumping. In
particular, our results show that the circularly polarized light can break the
time-reversal symmetry and induce the quantum anomalous Hall insulator (QAHI)
phase. Meanwhile, the bulk magnetic moment can also break the time-reversal
symmetry. Therefore, it shows rich phase diagram by tunning the intensity of
the light and the thickness of the thin film. Using the parameters fitted by
experimental data, we give the topological phase diagram of the Cr-doped
Bi$_{2}$Se$_{3}$ thin film, showing that by modulating the strength of the
polarized optical field in an experimentally accessible range, there are four
different phases: the normal insulator phase, the time-reversal-symmetry-broken
quantum spin Hall insulator phase, and two different QAHI phases with opposite
Chern numbers. Comparing with the non-doped Bi$_{2}$Se$_{3}$, it is found that
the interplay between the light and bulk magnetic moment separates the two
different QAHI phases with opposite Chern numbers. The results show that an
intrinsic magnetic topological insulator with high-frequency pumping is an
ideal platform for further exploring various topological phenomena with a
spontaneously broken time-reversal symmetry.
We demonstrate the robustness of the recently established Floquet-assisted
superradiant phase of the parametrically driven dissipative Dicke model,
inspired by light-induced dynamics in graphene. In particular, we show the
robustness of this state against key imperfections and argue for the
feasibility of utilizing it for laser operation. We consider the effect of a
finite linewidth of the driving field, modelled via phase diffusion. We find
that the linewidth of the light field in the cavity narrows drastically across
the FSP transition, reminiscent of a line narrowing at the laser transition. We
then demonstrate that the FSP is robust against inhomogeneous broadening, while
displaying a reduction of light intensity. We show that the depleted population
inversion of near-resonant Floquet states leads to hole burning in the
inhomogeneously broadened Floquet spectra. Finally, we show that the FSP is
robust against dissipation processes, with coefficients up to values that are
experimentally available. We conclude that the FSP presents a robust mechanism
that is capable of realistic laser operation.
In this work, we theoretically investigate the light-induced topological
phases and finite-size crossovers in a paradigmatic quantum spin Hall (QSH)
system with high-frequency pumping optics. Taking the HgTe quantum well for an
example, our numerical results show that circularly polarized light can break
time-reversal symmetry and induce the quantum anomalous Hall (QAH) phase. In
particular, the coupling between the edge states is spin dependent and is
related not only to the size of the system, but also to the strength of the
polarized pumping optics. By tuning the two parameters (system width and
optical pumping strength), we obtain four transport regimes, namely, QSH, QAH,
edge conducting, and normal insulator. These four different transport regimes
have contrasting edge conducting properties, which will feature prominently in
transport experiments on various topological materials.
Harvesting free energy from the environment is essential for the operation of
many biological and artificial systems. We investigate the maximum rate of
harvesting achievable by optimizing a set of reactions in a Markovian system,
possibly given topological, kinetic, and thermodynamic constraints. We show
that the maximum harvesting rate can be expressed as a variational principle,
which we solve in closed-form for three physically meaningful regimes. Our
approach is relevant for optimal design and for quantifying efficiency of
existing reactions. Our results are illustrated on bacteriorhodopsin, a
light-driven proton pump from Archae, which is found to be close to optimal
under realistic conditions.
The first-principles calculations predict a stable biphenylene carbon network
(BPN) like the Boron-nitride structure named inorganic biphenylene network
(I-BPN). A comparison has been done between BPN and I-BPN to examine the
stability of the I-BPN monolayer. We calculate the formation energy, phonon
dispersion and mechanical parameters: young modulus and Poisson ratio for
mechanical stability. It has been found that the stability of I-BPN is
comparable with the BPN. The lattice transport properties reveal that the
phonon thermal conductivity of I-BPN is 10th order low than the BPN. The
electronic band structure reveals that I-BPN is a semiconductor with an
indirect bandgap of 1.88 eV with valence band maximum (VBM) at Y and conduction
band maximum (CBM) at the X high symmetry point. In addition, the
thermoelectric parameters, such as the seebeck coefficient, show the highest
peak value of 0.00292 V/K at 324K. Electronic transport properties reveal that
I-BPN is highly anisotropic along the x and y-axes. Furthermore, the
thermoelectric power factor as a function of chemical potential shows a peak
value of 0.0056 W/mK2 (900K) along the x-axis in the p-type doping region. An
electronic figure of merit shows an amplified peak approach to 1. The total
figure of merit (including lattice transport parameters) shows peak values of
0.378 (0.21) for p-type and 0.24 (0.198) n-type regions along the x(y)
direction. It is notice that the obtain ZT peaks values are higher than any B-N
compositions.
Motivated by the recent experimental realization of the half-quantized Hall
effect phase in a three-dimensional (3D) semi-magnetic topological insulator
[M. Mogi et al., Nature Physics 18, 390 (2022)], we propose a scheme for
realizing the half-quantized Hall effect and axion insulator in experimentally
mature 3D topological insulator heterostructures. Our approach involves
optically pumping and/or magnetically doping the topological insulator surface,
such as to break time reversal and gap out the Dirac cones. By toggling between
left and right circularly polarized optical pumping, the sign of the
half-integer Hall conductance from each of the surface Dirac cones can be
controlled, such as to yield half-quantized ($0+1/2$), axion ($-1/2+1/2=0$),
and Chern ($1/2+1/2=1$) insulator phases. We substantiate our results based on
detailed band structure and Berry curvature numerics on the Floquet Hamiltonian
in the high-frequency limit. Our paper showcases how topological phases can be
obtained through mature experimental approaches such as magnetic layer doping
and circularly polarized laser pumping and opens up potential device
applications such as a polarization chirality-controlled topological
transistor.
Thermal rectifiers are devices that have different thermal conductivities in
opposing directions of heat flow. The realization of practical thermal
rectifiers relies significantly on a sound understanding of the underlying
mechanisms of asymmetric heat transport, and two-dimensional materials offer a
promising opportunity in this regard owing to their simplistic structures
together with a vast possibility of tunable imperfections. However, the
in-plane thermal rectification mechanisms in 2D materials like graphene having
directional gradients of grain sizes have remained elusive. In fact,
understanding the heat transport mechanisms in polycrystalline graphene, which
are more practical to synthesize than large-scale single-crystal graphene,
could potentially allow a unique opportunity, in principle, to combine with
other defects and designs for effective optimization of thermal rectification.
In this work, we investigate the thermal rectification behavior in periodic
atomistic models of polycrystalline graphene whose grain arrangements were
generated semi-stochastically to have different gradient grain-density
distributions along the in-plane heat flow direction. We employ the centroidal
Voronoi tessellation technique to generate realistic grain boundary structures
for graphene, and the non-equilibrium molecular dynamics simulations method is
used to calculate the thermal conductivities and rectification values.
Additionally, detailed phonon characteristics and propagating phonon spatial
energy densities are analyzed based on the fluctuation-dissipation theory to
elucidate the competitive interplay between two underlying mechanisms, namely,
(1) propagating phonon coupling and (2) temperature-dependence of thermal
conductivity that determine the degree of asymmetric heat flow in graded
polycrystalline graphene.
Recently, we introduced the active Dyson Brownian motion model (DBM), in
which $N$ run-and-tumble particles interact via a logarithmic repulsive
potential in the presence of a harmonic well. We found that in a broad range of
parameters the density of particles converges at large $N$ to the Wigner
semi-circle law, as in the passive case. In this paper, we provide an
analytical support for this numerical observation, by studying the fluctuations
of the positions of the particles in the nonequilibrium stationary state of the
active DBM, in the regime of weak noise and large persistence time. In this
limit, we obtain an analytical expression for the covariance between the
particle positions for any $N$ from the exact inversion of the Hessian matrix
of the system. We show that, when the number of particles is large $N \gg 1$,
the covariance matrix takes scaling forms that we compute explicitly both in
the bulk and at the edge of the support of the semi-circle. In the bulk, the
covariance scales as $N^{-1}$, while at the edge, it scales as $N^{-2/3}$.
Remarkably, we find that these results can be transposed directly to an
equilibrium model, the overdamped Calogero-Moser model in the low temperature
limit, providing an analytical confirmation of the numerical results by
Agarwal, Kulkarni and Dhar. For this model, our method also allows us to obtain
the equilibrium two-time correlations and their dynamical scaling forms both in
the bulk and at the edge. Our predictions at the edge are reminiscent of a
recent result in the mathematics literature by Gorin and Kleptsyn on the
(passive) DBM. That result can be recovered by the present methods, and also,
as we show, using the stochastic Airy operator. Finally, our analytical
predictions are confirmed by precise numerical simulations, in a wide range of
parameters.
In a stack of atomically-thin Van der Waals layers, introducing interlayer
twist creates a moir\'e superlattice whose period is a function of twist angle.
Changes in that twist angle of even hundredths of a degree can dramatically
transform the system's electronic properties. Setting a precise and uniform
twist angle for a stack remains difficult, hence determining that twist angle
and mapping its spatial variation is very important. Techniques have emerged to
do this by imaging the moir\'e, but most of these require sophisticated
infrastructure, time-consuming sample preparation beyond stack synthesis, or
both. In this work, we show that Torsional Force Microscopy (TFM), a scanning
probe technique sensitive to dynamic friction, can reveal surface and shallow
subsurface structure of Van der Waals stacks on multiple length scales: the
moir\'es formed between bi-layers of graphene and between graphene and
hexagonal boron nitride (hBN), and also the atomic crystal lattices of graphene
and hBN. In TFM, torsional motion of an AFM cantilever is monitored as it is
actively driven at a torsional resonance while a feedback loop maintains
contact at a set force with the sample surface. TFM works at room temperature
in air, with no need for an electrical bias between the tip and the sample,
making it applicable to a wide array of samples. It should enable determination
of precise structural information including twist angles and strain in moir\'e
superlattices and crystallographic orientation of VdW flakes to support
predictable moir\'e heterostructure fabrication.
Iron manganese trioxide (Fe0.25Mn0.75)2O3 nanocrystals were synthesized by
the sol-gel method. The 80 K Mossbauer spectrum was well-fitted using two
doublets representing the 8b and 24d crystallographic sites of the
(FexMn1-x)2O3 phase and two weak extra sextets which were attributed to
crystalline and amorphous hematite. Our findings showed formation of a bixbyite
primary phase. The Raman spectrum exhibits six Raman active modes, typical of
(Fe,Mn)2O3, and two extra Raman modes associated with the secondary hematite
phase. X-ray photoelectron spectroscopy analysis confirmed the presence of
oxygen vacancy onto the (FexMn1-x)2O3 particle surface, with varying oxidation
states. X-band magnetic resonance data revealed a single broad resonance line
in the whole temperature range (3.8 K - 300 K). The temperature dependence of
both resonance field and resonance linewidth shows a remarkable change in the
range of 40 - 50 K, herein credited to surface spin glass behavior. The model
picture used assumes (FexMn1-x)2O3 nanoparticles with a core-shell structure.
Results indicate that below about 50 K the spin system of shell reveals a
paramagnetic to spin glass-like transition upon cooling, with a critical
temperature estimated at 43 K. In the higher temperature range, the
superparamagnetic hematite (secondary) phase contributes remarkably to the
temperature dependence of the resonance linewidth. Zero-field-cooled (ZFC) and
fieldcooled (FC) data show strong irreversibility and a peak in the ZFC curve
at 33 K, attributed to a paramagnetic-ferrimagnetic transition of the main
phase. Hysteresis curve at 5 K shows a low coercive field of 4 kOe, with the
magnetization not reaching saturation at 70 kOe, suggesting the occurrence of a
ferrimagnetic core with a magnetic disorder at surface, characteristic of
core-shell spin-glass-like behavior.
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.
Reticular materials, including metal-organic frameworks and covalent organic
frameworks, combine relative ease of synthesis and an impressive range of
applications in various fields, from gas storage to biomedicine. Diverse
properties arise from the variation of building units$\unicode{x2013}$metal
centers and organic linkers$\unicode{x2013}$in almost infinite chemical space.
Such variation substantially complicates experimental design and promotes the
use of computational methods. In particular, the most successful artificial
intelligence algorithms for predicting properties of reticular materials are
atomic-level graph neural networks, which optionally incorporate domain
knowledge. Nonetheless, the data-driven inverse design involving these models
suffers from incorporation of irrelevant and redundant features such as full
atomistic graph and network topology. In this study, we propose a new way of
representing materials, aiming to overcome the limitations of existing methods;
the message passing is performed on a coarse-grained crystal graph that
comprises molecular building units. To highlight the merits of our approach, we
assessed predictive performance and energy efficiency of neural networks built
on different materials representations, including composition-based and
crystal-structure-aware models. Coarse-grained crystal graph neural networks
showed decent accuracy at low computational costs, making them a valuable
alternative to omnipresent atomic-level algorithms. Moreover, the presented
models can be successfully integrated into an inverse materials design pipeline
as estimators of the objective function. Overall, the coarse-grained crystal
graph framework is aimed at challenging the prevailing atom-centric perspective
on reticular materials design.
The periodic Anderson Hamiltonian of the bulk samarium hexaboride is
investigated in this article assuming the presence of ferromagnetic impurities
(FM). The problem of large on-site electron-electron repulsion is reformulated
in terms of a holonomic constraint using slave-boson technique. The model
analysis yields the possibility of the quantum anomalous Hall phase albeit with
high integer value of the Chern number despite no band-crossing feature at
discrete nodes as in 3D (Weyl) systems. Also, upon using the Fu-Kane-Mele
formalism, it is shown that the surface Hamiltonian without FM corresponds to a
strong topological insulator.
We present a study by Scanning Tunneling Microscopy, supported by ab initio
calculations, of the interaction between graphene and monolayer
(semiconducting) PtSe$_2$ as a function of the twist angle ${\theta}$ between
the two layers. We analyze the PtSe$_2$ contribution to the hybrid interface
states that develop within the bandgap of the semiconductor to probe the
interaction. The experimental data indicate that the interlayer coupling
increases markedly with the value of ${\theta}$, which is confirmed by ab
initio calculations. The moir\'e patterns observed within the gap are
consistent with a momentum conservation rule between hybridized states, and the
strength of the hybridization can be qualitatively described by a perturbative
model.
Two-dimensional materials (2DM) and their derived heterostructures have
electrical and optical properties that are widely tunable via several
approaches, most notably electrostatic gating and interfacial engineering such
as twisting. While electrostatic gating is simple and has been ubiquitously
employed on 2DM, being able to tailor the interfacial properties in a similar
real-time manner represents the next leap in our ability to modulate the
underlying physics and build exotic devices with 2DM. However, all existing
approaches rely on external machinery such as scanning microscopes, which often
limit their scope of applications, and there is currently no means of tuning a
2D interface that has the same accessibility and scalability as electrostatic
gating. Here, we demonstrate the first on-chip platform designed for 2D
materials with in situ tunable interfacial properties, utilizing a
microelectromechanical system (MEMS). Each compact, cost-effective, and
versatile device is a standalone micromachine that allows voltage-controlled
approaching, twisting, and pressurizing of 2DM with high accuracy. As a
demonstration, we engineer synthetic topological singularities, known as
merons, in the nonlinear optical susceptibility of twisted hexagonal boron
nitride (h-BN), via simultaneous control of twist angle and interlayer
separation. The chirality of the resulting moire pattern further induces a
strong circular dichroism in the second-harmonic generation. A potential
application of this topological nonlinear susceptibility is to create
integrated classical and quantum light sources that have widely and real-time
tunable polarization. Our invention pushes the boundary of available
technologies for manipulating low-dimensional quantum materials, which in turn
opens up the gateway for designing future hybrid 2D-3D devices for
condensed-matter physics, quantum optics, and beyond.
The relationship between acoustic parameters and the microstructure of a
Cu30Zn brass plate subjected to plastic deformation was evaluated. The plate,
previously annealed at 550 {\deg}C for 30 minutes, was cold rolled to
reductions in the 10-70\% range. Using the pulse-echo method, linear ultrasonic
measurements were performed on each of the nine specimens, corresponding to the
nine different reductions, recording the wave times of flight of longitudinal
wave along the thickness axis. Subsequently, acoustic measurements were
performed to determine the nonlinear parameter ($\beta$) through the second
harmonic generation. X-ray diffraction analysis revealed a steady increase and
subsequent saturation of deformation twins at 40\% thickness reduction. At
higher deformations, the microstructure revealed the generation and
proliferation of shear bands, which coincided with a decrease in the twinning
structure and an increase in dislocation density rate. Longitudinal wave
velocity exhibited a 0.9\% decrease at 20\% deformation, followed by a
continuous increase of 2\% beyond this point. These results can be rationalized
as a competition between a proliferation of dislocations, which tends to
decrease the linear sound velocity, and a decrease in average grain size, which
tends to increase it. These variations are in agreement with the values
obtained with XRD, Vickers hardness and metallography measurements. The
nonlinear parameter $\beta$ shows a significant maximum, at the factor of 8
level, at 40\% deformation. This maximum correlates well with a similar
maximum, at a factor of ten level and also at 40\% deformation, of the twinning
fault probability.
Flat band materials such as the kagome metals or moir\'e superlattice systems
are of intense current interest. Flat bands can result from the electron motion
on numerous (special) lattices and usually exhibit topological properties.
Their reduced bandwidth proportionally enhances the effect of Coulomb
interaction, even when the absolute magnitude of the latter is relatively
small. Seemingly unrelated to these cases is the large family of strongly
correlated electron systems, which includes the heavy fermion compounds,
cuprate and pnictide superconductors. In addition to itinerant electrons from
large, strongly overlapping orbitals, they frequently contain electrons from
more localized orbitals, which are subject to a large Coulomb interaction. The
question then arises as to what commonality in the physical properties and
microscopic physics, if any, exists between the two broad categories of
materials? A rapidly increasing body of strikingly similar phenomena across the
different platforms -- from electronic localization-delocalization transitions
to strange metal behavior and unconventional superconductivity -- suggests that
similar underlying principles could be at play. Indeed, it has recently been
suggested that flat band physics can be understood in terms of Kondo physics.
Inversely, the concept of electronic topology from lattice symmetry, which is
fundamental in flat band systems, is enriching the field of strongly correlated
electron systems where correlation-driven topological phases are increasingly
being investigated. Here we elucidate this connection, survey the new
opportunities for cross-fertilization in understanding across the platforms,
and assess the prospect for new insights that may be gained into both the
correlation physics and its intersection with electronic topology.

Date of feed: Fri, 22 Dec 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) **Bosonization and Anomaly Indicators of (2+1)-D Fermionic Topological Orders. (arXiv:2312.13341v1 [math-ph])**

Arun Debray, Weicheng Ye, Matthew Yu

**Entanglement smectic and stripe order. (arXiv:2312.13362v1 [cond-mat.mes-hall])**

Nilotpal Chakraborty, Roderich Moessner, Benoit Doucot

**Topological Superconductivity in Twisted Flakes of Nodal Superconductors. (arXiv:2312.13367v1 [cond-mat.supr-con])**

Kevin P. Lucht, J. H. Pixley, Pavel A. Volkov

**Quantum Scars and Caustics in Majorana Billiards. (arXiv:2312.13368v1 [cond-mat.mes-hall])**

R. Johanna Zijderveld, A. Mert Bozkurt, Michael Wimmer, İnanç Adagideli

**Integrable-to-Thermalizing Crossover in Non-Equilibrium Superconductors. (arXiv:2312.13391v1 [cond-mat.supr-con])**

Andrey Grankin, Victor Galitski

**Ultraclean two-dimensional hole systems with mobilities exceeding 10$^7$ cm$^2$/Vs. (arXiv:2312.13491v1 [cond-mat.mes-hall])**

Adbhut Gupta, C. Wang, S.K. Singh, K.W. Baldwin, R. Winkler, M. Shayegan, L.N. Pfeiffer

**Revisit the phase diagram and piezoelectricity of lead zirconate titanate from first principles. (arXiv:2312.13518v1 [cond-mat.mtrl-sci])**

Yubai Shi, Ri He, Bingwen Zhang, Zhicheng Zhong

**Quantum electrodynamics under a quench. (arXiv:2312.13531v1 [cond-mat.stat-mech])**

Ming-Rui Li, Shao-Kai Jian

**Contribution of Graphene Molecules C$_{53}$ C$_{52}$ C$_{51}$ on Astronomical Diffuse Interstellar Bands (DIB). (arXiv:2312.13550v1 [astro-ph.GA])**

Norio Ota

**The anomalous Floquet Anderson insulator in a continuously driven optical lattice. (arXiv:2312.13589v1 [cond-mat.quant-gas])**

Arijit Dutta, Efe Sen, Jun-Hui Zheng, Monika Aidelsburger, Walter Hofstetter

**Entanglement of edge modes in (very) strongly correlated topological insulators. (arXiv:2312.13598v1 [cond-mat.str-el])**

Nisa Ara, Emil Mathew, Rudranil Basu, Indrakshi Raychowdhury

**Layer-dependent evolution of electronic structures and correlations in rhombohedral multilayer graphene. (arXiv:2312.13637v1 [cond-mat.mes-hall])**

Yue-Ying Zhou, Yang Zhang, Shihao Zhang, Hao Cai, Ling-Hui Tong, Yuan Tian, Tongtong Chen, Qiwei Tian, Chen Zhang, Yiliu Wang, Xuming Zou, Xingqiang Liu, Yuanyuan Hu, Li Zhang, Lijie Zhang, Wen-Xiao Wang, Lei Liao, Zhihui Qin, Long-Jing Yin

**Pattern formation in charge density wave states after a quantum quench. (arXiv:2312.13727v1 [cond-mat.stat-mech])**

Lingyu Yang, Yang Yang, Gia-Wei Chern

**Hierarchical Topological States in Thermal Diffusive Networks. (arXiv:2312.13733v1 [cond-mat.supr-con])**

Bao Chen, Kaiyun Pang, Ru Zheng, Feng Liu

**Quantum confinement in Dirac-like nanostructures. (arXiv:2312.13748v1 [cond-mat.mes-hall])**

C. A. Downing, M. E. Portnoi

**Anomalies and Persistent Order in the Chiral Gross-Neveu model. (arXiv:2312.13756v1 [hep-th])**

Riccardo Ciccone, Lorenzo Di Pietro, Marco Serone

**Enhanced elastic stability of a topologically disordered crystalline metal--organic framework. (arXiv:2312.13846v1 [cond-mat.mtrl-sci])**

Emily G. Meekel, Phillippa Partridge, Robert A. I. Paraoan, Joshua J. B. Levinsky, Ben Slater, Claire L. Hobday, Andrew L. Goodwin

**Topological Phase Transitions with Zero Indirect Band Gap. (arXiv:2312.13907v1 [cond-mat.mes-hall])**

Giandomenico Palumbo

**Quantum Transport and Spectroscopy of Two-dimensional Perovskite/Graphene Interfaces. (arXiv:2312.13956v1 [cond-mat.mes-hall])**

Yan Sun, C. Morice, D. Garrot, R. Weil, K. Watanabe, T. Taniguchi, M. Monteverde, A.D. Chepelianskii

**Theory of interlayer exciton dynamics in 2D TMDCs Heterolayers under the influence of strain reconstruction and disorder. (arXiv:2312.14054v1 [cond-mat.mes-hall])**

Marten Richter

**Pseudo-spectral Landau-Lifshitz description of magnetization dynamics. (arXiv:2312.14068v1 [cond-mat.mes-hall])**

Kyle Rockwell, Joel Hirst, Thomas A. Ostler, Ezio Iacocca

**Nano-Imaging of Landau-Phonon Polaritons in Dirac Heterostructures. (arXiv:2312.14093v1 [physics.optics])**

Lukas Wehmeier, Suheng Xu, Rafael A. Mayer, Brian Vermilyea, Makoto Tsuneto, Michael Dapolito, Rui Pu, Zengyi Du, Xinzhong Chen, Wenjun Zheng, Ran Jing, Zijian Zhou, Kenji Watanabe, Takashi Taniguchi, Adrian Gozar, Qiang Li, Alexey B. Kuzmenko, G. Lawrence Carr, Xu Du, Michael M. Fogler, D.N. Basov, Mengkun Liu

**Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping. (arXiv:2106.02840v5 [cond-mat.mes-hall] UPDATED)**

Fang Qin, Rui Chen, Hai-Zhou Lu

**Robustness of the Floquet-assisted superradiant phase and possible laser operation. (arXiv:2211.01320v2 [cond-mat.other] UPDATED)**

Lukas Broers, Ludwig Mathey

**Light-induced phase crossovers in a quantum spin Hall system. (arXiv:2211.09114v3 [cond-mat.mes-hall] UPDATED)**

Fang Qin, Ching Hua Lee, Rui Chen

**Universal bounds on optimization of free energy harvesting. (arXiv:2303.04975v3 [cond-mat.stat-mech] UPDATED)**

Jordi Piñero, Ricard Solé, Artemy Kolchinsky

**Theoretical insights on structural, electronic and thermoelectric properties of inorganic biphenylene: non-benzenoid Boron nitride. (arXiv:2304.00868v2 [cond-mat.mtrl-sci] UPDATED)**

Ajay Kumar, Parbati Senapati, Prakash parida

**Light-induced half-quantized Hall effect and axion insulator. (arXiv:2306.03187v4 [cond-mat.mes-hall] UPDATED)**

Fang Qin, Ching Hua Lee, Rui Chen

**Competing mechanisms govern the thermal rectification behavior in semi-stochastic polycrystalline graphene with graded grain-size distribution. (arXiv:2307.12940v3 [cond-mat.mtrl-sci] UPDATED)**

Simanta Lahkar, Raghavan Ranganathan

**Fluctuations in the active Dyson Brownian motion and the overdamped Calogero-Moser model. (arXiv:2307.14306v2 [cond-mat.stat-mech] UPDATED)**

Leo Touzo, Pierre Le Doussal, Gregory Schehr

**Torsional Force Microscopy of Van der Waals Moir\'es and Atomic Lattices. (arXiv:2308.08814v2 [cond-mat.mtrl-sci] UPDATED)**

Mihir Pendharkar, Steven J. Tran, Gregory Zaborski Jr., Joe Finney, Aaron L. Sharpe, Rupini V. Kamat, Sandesh S. Kalantre, Marisa Hocking, Nathan J. Bittner, Kenji Watanabe, Takashi Taniguchi, Bede Pittenger, Christina J. Newcomb, Marc A. Kastner, Andrew J. Mannix, David Goldhaber-Gordon

**Structural, morphological, and magnetic characterizations of (Fe0.25Mn0.75)2O3 nanocrystals: a comprehensive stoichiometric determination. (arXiv:2308.11128v2 [cond-mat.mtrl-sci] UPDATED)**

John C. Mantilla, Luiz C. C. M. Nagamine, Daniel R. Cornejo, Renato Cohen, Wesley de Oliveira, Paulo E. N. Souza, Sebastião W. da Silva, Fermin F.H. Aragón, Pedro L. Gastelois, Paulo C. Morais, José A.H. Coaquira

**The role of pressure-induced stacking faults on the magnetic properties of gadolinium. (arXiv:2309.01285v3 [cond-mat.mtrl-sci] UPDATED)**

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

**Coarse-grained crystal graph neural networks for reticular materials design. (arXiv:2310.19500v2 [cond-mat.mtrl-sci] UPDATED)**

Vadim Korolev, Artem Mitrofanov

**Theoretical Investigation of the Periodic Anderson Hamiltonian of Samarium Hexaboride. (arXiv:2311.00583v2 [cond-mat.mes-hall] UPDATED)**

Partha Goswami, Udai Prakash Tyagi

**Angular dependence of the interlayer coupling at the interface between two dimensional materials 1T-PtSe$_2$ and graphene. (arXiv:2311.08165v2 [cond-mat.mes-hall] UPDATED)**

P. Mallet, F. Ibrahim, K. Abdukayumov, A. Marty, C. Vergnaud, F. Bonell, M. Chshiev, M. Jamet, J-Y. Veuillen

**An on-chip platform for multi-degree-of-freedom control of two-dimensional quantum and nonlinear materials. (arXiv:2311.12030v2 [cond-mat.mes-hall] UPDATED)**

Haoning Tang, Yiting Wang, Xueqi Ni, Kenji Watanabe, Takashi Taniguchi, Shanhui Fan, Eric Mazur, Amir Yacoby, Yuan Cao

**Correlation between microstructural deformation mechanisms and acoustic parameters on a cold-rolled Cu30Zn brass. (arXiv:2311.14430v2 [cond-mat.mtrl-sci] UPDATED)**

Maria Sosa, Linton Carvajal, Vicente Salinas, Fernando Lund, Claudio Aguilar, Felipe Castro

**Flat bands, strange metals, and the Kondo effect. (arXiv:2312.10659v2 [cond-mat.str-el] UPDATED)**

Joseph G. Checkelsky, B. Andrei Bernevig, Piers Coleman, Qimiao Si, Silke Paschen

Found 5 papers in prb The quantum anomalous Hall (QAH) effect has attracted significant attention due to its potential applications in low-power-consumption spintronic devices. In this study, we performed density functional theory calculations to investigate the stability, electronic, and topological properties of ${\mat… We revisit the intriguing magnetic behavior of the paradigmatic itinerant frustrated magnet $\mathrm{Sr}{\mathrm{Co}}_{2}{\mathrm{As}}_{2}$, which shows strong and competing magnetic fluctuations yet does not develop long-range magnetic order. By calculating the static spin susceptibility $χ(\mathbf… The Li-Haldane correspondence [Phys. Rev. Lett. Rhombohedral trilayer graphene (rTG) has recently emerged as a new playground for exploring flatband-induced exotic quantum phenomena and sparked considerable concern. However, the experimental accessing of local quantum behaviors such as the quantum confinement of flatband electrons in rTG has been… The discovery of all-optical ultrafast deterministic magnetization switching has opened up new possibilities for manipulating magnetization in devices using femtosecond laser pulses. Previous studies on single pulse all-optical helicity-independent switching (AO-HIS) have mainly focused on perpendic…

Date of feed: Fri, 22 Dec 2023 04:16:56 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) **${\mathrm{Ti}}_{3}{\mathrm{O}}_{5}$ monolayer: Tunable quantum anomalous Hall insulator**

Xiaokang Xu, Tianxia Guo, Donghao Guan, Jie Li, Ailei He, Jinlian Lu, Xiaojing Yao, Yongjun Liu, and Xiuyun Zhang

Author(s): Xiaokang Xu, Tianxia Guo, Donghao Guan, Jie Li, Ailei He, Jinlian Lu, Xiaojing Yao, Yongjun Liu, and Xiuyun Zhang

[Phys. Rev. B 108, 214427] Published Thu Dec 21, 2023

**Competing magnetic fluctuations and orders in a multiorbital model of doped ${\mathrm{SrCo}}_{2}{\mathrm{As}}_{2}$**

Ana-Marija Nedić, Morten H. Christensen, Y. Lee, Bing Li, Benjamin G. Ueland, Rafael M. Fernandes, Robert J. McQueeney, Liqin Ke, and Peter P. Orth

Author(s): Ana-Marija Nedić, Morten H. Christensen, Y. Lee, Bing Li, Benjamin G. Ueland, Rafael M. Fernandes, Robert J. McQueeney, Liqin Ke, and Peter P. Orth

[Phys. Rev. B 108, 245149] Published Thu Dec 21, 2023

**Entanglement spectra of nonchiral topological ($2+1$)-dimensional phases with strong time-reversal symmetry breaking, Li-Haldane state counting, and PEPS**

Mark J. Arildsen, Norbert Schuch, and Andreas W. W. Ludwig

Author(s): Mark J. Arildsen, Norbert Schuch, and Andreas W. W. Ludwig**101**, 010504 (2008)] is often used to help identify wave functions of $(2+1)$-dimensional chiral topological phases (i.e., with nonzero chiral central charge) by studying low-lying entanglement spectra (ES) on long cylinders of finite circumference. Her…

[Phys. Rev. B 108, 245150] Published Thu Dec 21, 2023

**Quantum confinement and interference via Fabry-Pérot-like resonators in rhombohedral trilayer graphene on graphite**

Zi-Yi Han, Lin He, and Long-Jing Yin

Author(s): Zi-Yi Han, Lin He, and Long-Jing Yin

[Phys. Rev. B 108, 245422] Published Thu Dec 21, 2023

**Single laser pulse induced magnetization switching in in-plane magnetized GdCo alloys**

Jun-Xiao Lin, Michel Hehn, Thomas Hauet, Yi Peng, Junta Igarashi, Yann Le Guen, Quentin Remy, Jon Gorchon, Gregory Malinowski, Stéphane Mangin, and Julius Hohlfeld

Author(s): Jun-Xiao Lin, Michel Hehn, Thomas Hauet, Yi Peng, Junta Igarashi, Yann Le Guen, Quentin Remy, Jon Gorchon, Gregory Malinowski, Stéphane Mangin, and Julius Hohlfeld

[Phys. Rev. B 108, L220403] Published Thu Dec 21, 2023

Found 2 papers in prl Muonic helium atom hyperfine structure (HFS) measurements are a sensitive tool to test the three-body atomic system and bound-state quantum electrodynamics theory, and determine fundamental constants of the negative muon magnetic moment and mass. The world’s most intense pulsed negative muon beam at… In Bose-Fermi mixtures under particular conditions, a symmetry-protected topological state goes through a continuous transition to two decoupled fractional quantum Hall states.

Date of feed: Fri, 22 Dec 2023 04:16:54 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) **Improved Measurements of Muonic Helium Ground-State Hyperfine Structure at a Near-Zero Magnetic Field**

P. Strasser, S. Fukumura, R. Iwai, S. Kanda, S. Kawamura, M. Kitaguchi, S. Nishimura, S. Seo, H. M. Shimizu, K. Shimomura, H. Tada, and H. A. Torii (MuSEUM Collaboration)

Author(s): P. Strasser, S. Fukumura, R. Iwai, S. Kanda, S. Kawamura, M. Kitaguchi, S. Nishimura, S. Seo, H. M. Shimizu, K. Shimomura, H. Tada, and H. A. Torii (MuSEUM Collaboration)

[Phys. Rev. Lett. 131, 253003] Published Thu Dec 21, 2023

**Continuous Phase Transitions between Fractional Quantum Hall States and Symmetry-Protected Topological States**

Ying-Hai Wu, Hong-Hao Tu, and Meng Cheng

Author(s): Ying-Hai Wu, Hong-Hao Tu, and Meng Cheng

[Phys. Rev. Lett. 131, 256502] Published Thu Dec 21, 2023

Found 1 papers in pr_res The charge-density-wave (CDW) phase in the layered transition-metal dichalcogenide ${\mathrm{VTe}}_{2}$ is strongly coupled to the band inversion involving vanadium and tellurium orbitals. In particular, this coupling leads to a selective disappearance of the Dirac-type states that characterize the …

Date of feed: Fri, 22 Dec 2023 04:16:54 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 all-optical manipulation of the charge-density wave in ${\mathrm{VTe}}_{2}$**

Manuel Tuniz, Davide Soranzio, Davide Bidoggia, Denny Puntel, Wibke Bronsch, Steven L. Johnson, Maria Peressi, Fulvio Parmigiani, and Federico Cilento

Author(s): Manuel Tuniz, Davide Soranzio, Davide Bidoggia, Denny Puntel, Wibke Bronsch, Steven L. Johnson, Maria Peressi, Fulvio Parmigiani, and Federico Cilento

[Phys. Rev. Research 5, 043276] Published Thu Dec 21, 2023

Found 2 papers in nano-lett

Date of feed: Thu, 21 Dec 2023 14:06:53 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] Free-Standing Carbon Nanotube Embroidered Graphene Film Electrode Array for Stable Neural Interfacing**

Lei Gao, Suye Lv, Yuanyuan Shang, Shouliang Guan, Huihui Tian, Ying Fang, Jinfen Wang, and Hongbian LiNano LettersDOI: 10.1021/acs.nanolett.3c03421

**[ASAP] Nanoscale Manipulation of Exciton–Trion Interconversion in a MoSe2 Monolayer via Tip-Enhanced Cavity-Spectroscopy**

Mingu Kang, Su Jin Kim, Huitae Joo, Yeonjeong Koo, Hyeongwoo Lee, Hyun Seok Lee, Yung Doug Suh, and Kyoung-Duck ParkNano LettersDOI: 10.1021/acs.nanolett.3c03920

Found 1 papers in acs-nano

Date of feed: Thu, 21 Dec 2023 14:03:07 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] Vertical Phase-Engineering MoS2 Nanosheet-Enhanced Textiles for Efficient Moisture-Based Energy Generation**

Yuan-Ming Cao, Yang Su, Mi Zheng, Peng Luo, Yang-Biao Xue, Bin-Bin Han, Min Zheng, Zuoshan Wang, Liang-Sheng Liao, and Ming-Peng ZhuoACS NanoDOI: 10.1021/acsnano.3c08132