Found 73 papers in cond-mat Mean-field models have the ability to predict grain size distribution
evolution occurring through thermomechanical solicitations. This article
focuses on a comparison of mean-field models under grain growth conditions.
Different microstructure representations are considered and discussed,
especially regarding the consideration of topology in the neighborhood
construction. Experimental data obtained with a heat treatment campaign on a
316L austenitic stainless steel are used for material parameters identification
and as a reference for model comparisons. Mean-field models are also confronted
to both mono- and bimodal initial grain size distributions to investigate the
interest of introducing neighborhood topology in microstructure predictions
models. This article exposes that improvements in the predictions are obtained
in monomodal cases for topological models. In bimodal test, no comparison with
experimental data were performed as no data were available. But relative
comparisons between models indicate few differences in predictions. The
interest of neighborhood topology in grain growth mean-field models gives
overall small improvements compared to classical mean-field models when
comparing implementation complexity.
We propose the use of networks of standard, commercially-available coaxial
cables as a platform to realize photonic lattice models. As a specific example,
we consider a brick wall lattice formed from coaxial cables and T-shaped
connectors. We calculate the dispersion of photonic Bloch waves in the lattice:
we find a repeated family of three bands, which include a flat band and two
Dirac points. We then demonstrate a method to displace the Dirac points,
leading to an induced artificial gauge field, and a method to energetically
isolate the flat band. Our results readily suggest that the interplay of
nonlinearities and non-trivial topology are a natural avenue to explore in
order to unlock the full power of this proposed platform.
The relativistic Langevin equation poses a number of technical and conceptual
problems related to its derivation and underlying physical assumptions.
Recently, a method has been proposed in [A. Petrosyan and A. Zaccone, J. Phys.
A: Math. Theor. 55 015001 (2022)] to derive the relativistic Langevin equation
from a first-principles particle-bath Lagrangian. As a result of the
particle-bath coupling, a new ``restoring force'' term appeared, which breaks
translation symmetry. Here we revisit this problem aiming at deriving a fully
translation-invariant relativistic Langevin equation. We successfully do this
by adopting the renormalization potential protocol originally suggested by
Caldeira and Leggett. The relativistic renormalization potential is derived
here and shown to reduce to Caldeira and Leggett's form in the non-relativistic
limit. The introduction of this renormalization potential successfully removes
the restoring force and a fully translation-invariant relativistic Langevin
equation is derived for the first time. The physically necessary character of
the renormalization potential is discussed in analogy with non-relativistic
systems, where it emerges due to the renormalization of the tagged particle
dynamics due to its interaction with the bath oscillators (a phenomenon akin to
level-repulsion or avoided-crossing in condensed matter). We discuss the
properties that the corresponding non-Markovian friction kernel has to satisfy,
with implications ranging from transport models of the quark-gluon plasma, to
relativistic viscous hydrodynamic simulations, and to electrons in graphene.
Exciton-exciton interactions are key to understanding non-linear optical and
transport phenomena in van der Waals heterobilayers, which emerged as versatile
platforms to study correlated electronic states. We present a combined
theory-experiment study of excitonic many-body effects based on first-principle
band structures and Coulomb interaction matrix elements. Key to our approach is
the explicit treatment of the fermionic substructure of excitons and dynamical
screening effects for density-induced energy renormalization and dissipation.
We demonstrate that dipolar blue shifts are almost perfectly compensated by
many-body effects, mainly by screening-induced self-energy corrections.
Moreover, we identify a crossover between attractive and repulsive behavior at
elevated exciton densities. Theoretical findings are supported by experimental
studies of spectrally-narrow interlayer excitons in atomically-reconstructed,
hBN-encapsulated MoSe$_2$/WSe$_2$ heterobilayers. Both theory and experiment
show energy renormalization on a scale of a few meV even for high injection
densities in the vicinity of the Mott transition. Our results revise the
established picture of dipolar repulsion dominating exciton-exciton
interactions in van der Waals heterostructures and open up opportunities for
their external design.
By analogy with the fundamental quantum units of electrical conductance
$G_0^e=\frac{2 e^2}{h}$ and thermal conductance $K_0^t=\frac{2 K_B^2 T}{h}$ we
define a fundamental quantum unit of conductance, $G_0^m$, and diffusion of a
massive gas of atomic particles, respectively given by $$ G_0^m=\frac{m^2}{h} \
, \ D_0=\frac{h}{m}$$ with $h$ the Planck constant, $K_B$ the Boltzmann
constant, $T$ the absolute temperature, $e$ the unit charge and $m$ the mass of
the atomic gas particle that move balistically in a one dimensional medium of
length $L$. The effect of scattering can be accounted for by introducing an
appropriate transmission probability in analogy with the quantum electrical
conductance model introduced by Landauer in 1957. For an electron gas
$G_0^m=1.25 \times 10^{-27} \ Kg^2/(J s)$ and $D_0 = 7.3 \times 10^{-3} \
m^2/s$, and we found a quantum expression for the generalized Einstein relation
that writes $$G_0^e = \frac{2e^2m}{h^2} D_0 $$
The Kitaev model on a honeycomb lattice may provide a robust topological
quantum memory platform, but finding a material that realizes the unique spin
liquid phase remains a considerable challenge. We demonstrate that an effective
Kitaev Hamiltonian can arise from a half-filled Fermi-Hubbard Hamiltonian where
each site can experience a magnetic field in a different direction. As such, we
provide a method for realizing the Kitaev spin liquid on a single hexagonal
plaquette made up of twelve quantum dots. Despite the small system size, there
are clear signatures of the Kitaev spin-liquid ground state, and there is a
range of parameters where these signatures are predicted, allowing a potential
platform where Kitaev spin-liquid physics can be explored experimentally in
quantum dot plaquettes.
Axial vectors, such as current or magnetization, are commonly used order
parameters in time-reversal symmetry breaking systems. These vectors also break
isotropy in three dimensional systems, lowering the spatial symmetry. We
demonstrate that it is possible to construct a fully isotropic and
inversion-symmetric three-dimensional medium where time-reversal symmetry is
systematically broken. We devise a cubic crystal with scalar time-reversal
symmetry breaking, implemented by hopping through chiral magnetic clusters
along the crystal bonds. The presence of only the spatial symmetries of the
crystal -- finite rotation and inversion symmetry -- is sufficient to protect a
topological phase. The realization of this phase in amorphous systems with
average continuous rotation symmetry yields a statistical topological insulator
phase. We demonstrate the topological nature of our model by constructing a
bulk integer topological invariant, which guarantees gapless surface spectrum
on any surface with several overlapping Dirac nodes, analogous to crystalline
mirror Chern insulators. We also show the expected transport properties of a
three-dimensional statistical topological insulator, which remains critical on
the surface for odd values of the invariant.
Majorana zero modes (MZMs), emerging as exotic quasiparticles that carry
non-Abelian statistics, hold great promise for achieving fault-tolerant
topological quantum computation. A key signature of the presence of MZMs is the
zero-bias peaks (ZBPs) from tunneling differential conductance. However, the
identification of MZMs from ZBPs has faced tremendous challenges, due to the
presence of topological trivial states that generate spurious ZBP signals. In
this work, we introduce a machine-learning framework that can discern MZM from
other signals using ZBP data. Quantum transport simulation from tight-binding
models is used to generate the training data, while persistent cohomology
analysis confirms the feasibility of classification via machine learning. In
particular, even with added data noise, XGBoost classifier reaches $85\%$
accuracy for 1D tunneling conductance data and $94\%$ for 2D data incorporating
Zeeman splitting. Tests on prior ZBP experiments show that some data are more
likely to originate from MZM than others. Our model offers a quantitative
approach to assess MZMs using ZBP data. Furthermore, our results shed light on
the use of machine learning on exotic quantum systems with
experimental-computational integration.
Weyl fermions are hypothetical chiral particles that can also manifest as
excitations near three-dimensional band crossing points in lattice systems.
These quasiparticles are subject to the Nielsen-Ninomiya "no-go" theorem when
placed on a lattice, requiring the total chirality across the Brillouin zone to
vanish. This constraint results from the topology of the (orientable) manifold
on which they exist. Here, we ask to what extent the concepts of topology and
chirality of Weyl points remain well-defined when the underlying manifold is
non-orientable. We show that the usual notion of chirality becomes ambiguous in
this setting, allowing for systems with a non-zero total chirality.
Furthermore, we discover that Weyl points on non-orientable manifolds carry an
additional $\mathbb{Z}_2$ topological invariant which satisfies a different
no-go theorem. We implement such Weyl points by imposing a non-symmorphic
symmetry in the momentum space of lattice models. Finally, we experimentally
realize all aspects of their phenomenology in a photonic platform with
synthetic momenta. Our work highlights the subtle but crucial interplay between
the topology of quasiparticles and of their underlying manifold.
The Einstein-de Haas (EdH) effect is a fundamental, mechanical consequence of
any temporal change of magnetism in an object. EdH torque results from
conserving the object's total angular momentum: the angular momenta of all the
specimen's magnetic moments, together with its mechanical angular momentum.
Although the EdH effect is usually small and difficult to observe, it increases
in magnitude with detection frequency. We explore the frequency-dependence of
EdH torque for a thin film permalloy microstructure by employing a ladder of
flexural beam modes (with five distinct resonance frequencies spanning from 3
to 208 MHz) within a nanocavity optomechanical torque sensor via magnetic
hysteresis curves measured at mechanical resonances. At low DC fields the
gyrotropic resonance of a magnetic vortex spin texture overlaps the 208 MHz
mechanical mode. The massive EdH mechanical torques arising from this
co-resonance yield a fingerprint of vortex core pinning and depinning in the
sample. The experimental results are discussed in relation to mechanical
torques predicted from both macrospin (at high DC magnetic field) and
finite-difference solutions to the Landau-Lifshitz-Gilbert (LLG) equation. A
global fit of the LLG solutions to the frequency-dependent data reveals a
statistically significant discrepancy between the experimentally observed and
simulated torque phase behaviours at spin texture transitions that can be
reduced through the addition of a time constant to the conversion between
magnetic cross-product torque and mechanical torque, constrained by experiment
to be in the range of 0.5 - 4 ns.
Kagome magnet has been found to be a fertile ground for the search of exotic
quantum states in condensed matter. Arising from the unusual geometry, the
quantum interactions in the kagome lattice give rise to various quantum states,
including the Chern-gapped Dirac fermion, Weyl fermion, flat band and van Hove
singularity. Here we review recent advances in the study of the R166 kagome
magnet (RT6E6, R = rare earths; T = transition metals; and E = Sn, Ge, etc.)
whose crystal structure highlights the transition-metal-based kagome lattice
and rare-earth sublattice. Compared with other kagome magnets, the R166 family
owns the particularly strong interplays between the d electrons on the kagome
site and the localized f electrons on the rare-earth site. In the form of
spin-orbital coupling, exchange interaction and many-body effect, the quantum
interactions play an essential role in the Berry curvature field in both the
reciprocal and real spaces of R166 family. We discuss the spectroscopic and
transport visualization of the topological electrons hosted in the Mn kagome
layer of RMn6Sn6 and the various topological effects due to the quantum
interactions, including the Chern-gap opening, the exchange-biased effect, the
topological Hall effect and the emergent inductance. We hope this work serves
as a guide for future explorations of quantum magnets.
We investigate the electronic and magnetic properties of the newly
synthesized double perovskites Y$_{2}$NiIrO$_{6}$ and La$_{2}$NiIrO$_{6}$,
using density functional calculations, crystal field theory, superexchange
pictures, and Monte Carlo simulations. We find that both systems are
antiferromagnetic (AFM) Mott insulators, with the high-spin Ni$^{2+}$
$t_{2g}$$^{6}e_{g}$$^{2}$ ($S=1$) and the low-spin Ir$^{4+}$ $t_{2g}$$^{5}$
($S=1/2$) configurations. We address that their lattice distortion induces
$t_{2g}$-$e_{g}$ orbital mixing and thus enables the normal Ni$^{+}$-Ir$^{5+}$
charge excitation with the electron hopping from the Ir `$t_{2g}$' to Ni
`$e_g$' orbitals, which promotes the AFM Ni$^{2+}$-Ir$^{4+}$ coupling.
Therefore, the increasing $t_{2g}$-$e_{g}$ mixing accounts for the enhanced
$T_{\rm N}$ from the less distorted La$_{2}$NiIrO$_{6}$ to the more distorted
Y$_{2}$NiIrO$_{6}$. Moreover, our test calculations find that in the otherwise
ideally cubic Y$_{2}$NiIrO$_{6}$, the Ni$^{+}$-Ir$^{5+}$ charge excitation is
forbidden, and only the abnormal Ni$^{3+}$-Ir$^{3+}$ excitation gives a weakly
ferromagnetic (FM) behavior. Furthermore, we find that owing to the crystal
field splitting, Hund exchange, and broad band formation in the highly
coordinated fcc sublattice, Ir$^{4+}$ ions are not in the $j_{\rm eff}=1/2$
state but in the $S=1/2$ state carrying a finite orbital moment by spin-orbit
coupling (SOC). This work clarifies the varying magnetism in Y$_{2}$NiIrO$_{6}$
and La$_{2}$NiIrO$_{6}$ associated with the lattice distortions.
We study the morphology of the Saturn ring defect and director structure
around a colloidal particle with normal anchoring conditions and within the
flow of the nematic host phase through a rectangular duct of comparable size to
the particle. The changes in the defect structures and director profile
influence the advection behaviour of the particle, which we compare to that in
a simple Newtonian host phase. These effects lead to a non-monotonous
dependence of the differential velocity of particle and fluid, also known as
retardation ratio, on the Ericksen number.
The storage of continuous variables in working memory is hypothesized to be
sustained in the brain by the dynamics of recurrent neural networks (RNNs)
whose steady states form continuous manifolds. In some cases, it is thought
that the synaptic connectivity supports multiple attractor manifolds, each
mapped to a different context or task. For example, in hippocampal area CA3,
positions in distinct environments are represented by distinct sets of
population activity patterns, each forming a continuum. It has been argued that
the embedding of multiple continuous attractors in a single RNN inevitably
causes detrimental interference: quenched noise in the synaptic connectivity
disrupts the continuity of each attractor, replacing it by a discrete set of
steady states that can be conceptualized as lying on local minima of an
abstract energy landscape. Consequently, population activity patterns exhibit
systematic drifts towards one of these discrete minima, thereby degrading the
stored memory over time. Here we show that it is possible to dramatically
attenuate these detrimental interference effects by adjusting the synaptic
weights. Synaptic weight adjustments are derived from a loss function that
quantifies the roughness of the energy landscape along each of the embedded
attractor manifolds. By minimizing this loss function, the stability of states
can be dramatically improved, without compromising the capacity.
Hydrodynamic phonon transport phenomena, like second sound, have been
observed in liquid Helium temperatures more than 50 years ago. More recently
second sound has been observed in graphite at over 200\,K using transient
thermal grating techniques. In this work we explore the signatures of second
sound in ultrafast electron diffuse scattering (UEDS) patterns. We use density
functional theory and solve the Boltzmann transport equation to determine
time-resolved non-equilibrium phonon populations and subsequently calculate
one-phonon structure factors and diffuse scattering patterns to simulate
experimental data covering the regimes of ballistic, diffusive, and
hydrodynamic phonon transport. For systems like graphite, UEDS is capable of
extracting time-dependent phonon occupancies across the entire Brillouin zone
and ultimately lead to a more fundamental understanding of the hydrodynamic
phonon transport regime.
In fluorescence spectra of nanodiamonds (NDs) synthesized at high pressure
from adamantane and other organic compounds, very narrow (~1 nm) lines of
unknown origin are observed in a wide spectroscopic range from ~500 to 800 nm.
Here, we propose and experimentally substantiate the hypothesis that these
mysterious lines arise from radiative recombination of donor-acceptor pairs
(DAPs). To confirm our hypothesis, we study the fluorescence spectra of undoped
and nitrogen-doped NDs of different sizes, before and after thermal oxidation
of their surface. The results obtained with a high degree of confidence allowed
us to conclude that the DAPs are formed through the interaction of donor-like
substitutional nitrogen present in the diamond lattice, and a 2D layer of
acceptors resulting from the transfer doping effect on the surface of
hydrogen-terminated NDs. A specific behavior of the DAP-induced lines was
discovered in the temperature range of 100-10 K: their energy increases and
most lines are split into 2 or more components with decreasing temperature. It
is shown that the majority of the studied DAP emitters are sources of single
photons, with an emission rate of up to >1 million counts/s at room
temperature, which significantly surpasses that of nitrogen-vacancy and
silicon-vacancy centers under the same detection conditions. Despite an
observed temporal instability in the emission, the DAP emitters of H-terminated
NDs represent a powerful room-temperature single-photon source for quantum
optical technologies.
Prediction and discovery of new materials with desired properties are at the
forefront of quantum science and technology research. A major bottleneck in
this field is the computational resources and time complexity related to
finding new materials from ab initio calculations. In this work, an effective
and robust deep learning-based model is proposed by incorporating persistent
homology and graph neural network which offers an accuracy of 91.4% and an F1
score of 88.5% in classifying topological vs. non-topological materials,
outperforming the other state-of-the-art classifier models. The incorporation
of the graph neural network encodes the underlying relation between the atoms
into the model based on their own crystalline structures and thus proved to be
an effective method to represent and process non-euclidean data like molecules
with a relatively shallow network. The persistent homology pipeline in the
suggested neural network is capable of integrating the atom-specific
topological information into the deep learning model, increasing robustness,
and gain in performance. It is believed that the presented work will be an
efficacious tool for predicting the topological class and therefore enable the
high-throughput search for novel materials in this field.
We present our angle resolved photoelectron spectroscopy (ARPES) and density
functional theory results on quaternary topological insulator (TI)
BiSbTe1.25Se1.75 (BSTS) confirming the non-trivial topology of the surface
state bands (SSBs) in this compound. We find that the SSBs, which are are
sensitive to the atomic composition of the terminating surface have a partial
3D character. Our detailed study of the band bending (BB) effects shows that in
BSTS the Dirac point (DP) shifts by more than two times compared to that in
Bi2Se3 to reach the saturation. The stronger BB in BSTS could be due to the
difference in screening of the surface charges. From momentum density curves
(MDCs) of the ARPES data we obtained an energy dispersion relation showing the
warping strength of the Fermi surface in BSTS to be intermediate between those
found in Bi2Se3 and Bi2Te3 and also to be tunable by controlling the ratio of
chalcogen/pnictogen atoms. Our experiments also reveal that the nature of the
BB effects are highly sensitive to the exposure of the fresh surface to various
gas species. These findings have important implications in the tuning of DP in
TIs for technological applications.
Correlation effects are observed strong in Iron chalcogenides superconductors
by experimental and theoretical investigations. We present a comparative study
of the influence of Coulomb interaction and Hund's coupling in the electronic
structure of FeSe and FeTe. The calculation is based on density functional
theory (DFT) with local density approximation(LDA+U) framework employed in
TB-LMTO ASA code. We found the correlation effects were orbital selective due
to the strength of interorbital hybridization among different Fe-3d orbitals
mediated via chalcogen (Se/Te-p) orbitals is different in both the compounds,
however Coulomb interaction is screened significantly by Te-p bands in FeTe.
Similarly the orbital section is different in both the compounds because of the
difference in the chalcogen height.
We theoretically investigate a novel two-dimensional decorated honeycomb
lattice framework to realize a second-order topological magnon insulator
(SOTMI) phase featuring distinct corner-localized modes. Our study emphasizes
the pivotal role of spin-magnon mapping in characterizing bosonic topological
properties, which exhibit differences from their fermionic counterparts. We
employ a symmetry indicator topological invariant to identify and characterize
this SOTMI phase, particularly for systems respecting time-reversal and
${\sf{C}}_6$ rotational symmetry. Using a spin model defined on a honeycomb
lattice geometry, we demonstrate that introducing "kekule" type distortions
yields a topological phase. In contrast, anti-kekule" distortions result in a
non-topological magnonic phase. The presence of kekule distortions manifests in
two distinct topologically protected bosonic corner modes - an "intrinsic" and
a "pseudo", based on the specific edge terminations. On the other hand,
anti-kekule distortions give rise to bond-localized boundary modes, which are
non-topological and reliant on particular edge termination. We further
investigate the effects of random out-of-plane exchange anisotropy disorder on
the robustness of these bosonic corner modes. The distinction between SOTMIs
and their fermionic counterparts arises due to the system-specific magnonic
onsite energies, a crucial feature often overlooked in prior literature. Our
study unveils exciting prospects for engineering higher-order topological
phases in magnon systems and enhances our understanding of their unique
behavior within decorated honeycomb lattices.
We present a comparative study of the valence band electronic structure of Pd
based ternary chalcogenide superconductors Nb2Pd0.95S5, Ta2Pd0.97S6 and
Ta2Pd0.97Te6 using experimental photoemission spectroscopy and density
functional based theoretical calculations. We observe a qualitatively
similarity between valence band (VB) spectra of Nb2Pd0.95S5 and Ta2Pd0.97S6.
Further, we find a pseudogap feature in Nb2Pd0.95S5 at low temperature, unlike
other two compounds. We have correlated the structural geometry with the
differences in VB spectra of these compounds. The different atomic packing in
these compounds could vary the strength of inter-orbital hybridization among
various atoms which leads to difference in their electronic structure as
clearly observed in our DOS calculations.
In the past decade, there has been a systematic investigation of
symmetry-protected topological (SPT) phases in interacting fermion systems.
Specifically, by utilizing the concept of equivalence classes of finite-depth
fermionic symmetric local unitary (FSLU) transformations and the decorating
symmetry domain wall picture, a large class of fixed-point wave functions have
been constructed for fermionic SPT (FSPT) phases. Remarkably, this construction
coincides with the Atiyah-Hirzebruch spectral sequence, enabling a complete
classification of FSPT phases. However, unlike bosonic SPT phases, the stacking
group structure in fermion systems proves to be much more intricate. The
construction of fixed-point wave functions does not explicitly provide this
information. In this paper, we employ FSLU transformations to investigate the
stacking group structure of FSPT phases. Specifically, we demonstrate how to
compute stacking FSPT data from the input FSPT data in each layer, considering
both unitary and anti-unitary symmetry, up to 2+1 dimensions. As concrete
examples, we explictly compute the stacking group structure for crystalline
FSPT phases in all 17 wallpaper groups using the fermionic crystalline
equivalence principle. Importantly, our approach can be readily extended to
higher dimensions, offering a versatile method for exploring the stacking group
structure of FSPT phases.
Nonlinear transport phenomena offer an exciting probe into the topology and
band geometry of the system. Here, we investigate the intrinsic third-order
nonlinear responses, independent of the scattering time, using the density
matrix-based quantum kinetic formalism. We predict a new intrinsic third-order
response that is dissipative and identify a novel intrinsic contribution to the
dissipationless Hall response. We demonstrate that these previously unexplored
contributions originate from the band geometric quantities such as the Berry
curvature and symplectic connection, which are finite in systems that break
time-reversal symmetry. We prescribe the symmetry dictionary for these
fundamental transport coefficients and unify our quantum kinetic results with
results from semiclassical wave-packet formalism. We illustrate our results in
antiferromagnetic monolayer SrMnBi$_2$. Our study significantly advances the
fundamental understanding of third-order responses.
Two quintuple layers of strong topological insulator Bi2Se3 are coupled by a
Bi bilayer in BiSe crystal. We investigated its electronic structure using
angle resolved photoelectron spectroscopy to study its topological nature.
Dirac like linearly dispersive surface state bands are observed on the 001
surface of BiSe and Sb doped BiSe, similar to Bi2Se3. Moreover, the lower part
of the SSBs buries deep in the bulk valence band. Overlap region between the
SSBs and BVB is large in Sb doped system and the SSBs deviate from the Dirac
like linear dispersion in this region.
These results highlight the role of interlayer coupling between the Bi
bilayer and the Bi2Se3 QLs.
Furthermore, we observed a large intensity imbalance in the SSBs located at
the positive and negative k parallel directions. This asymmetry pattern
gradually reverses as the excitation energy scans from low 14eV to high 34eV
value. However, we did not observe signal of surface magnetization resulting
from the intensity imbalance in SSBs due to hole-generated uncompensated spin
accumulation in the photoexcitation process. The main reason for this could be
the faster relaxation process for photo hole due to the presence of the Bi
bilayer between the adjacent Bi2Se3 QLs. The observed photon energy dependent
intensity variation could be a signature of the mixing between the spin and the
orbit texture of the SSBs.
Topological semimetal antiferromagnets provide a rich source of exotic
topological states which can be controlled by manipulating the orientation of
the N\'eel vector, or by modulating the lattice parameters through strain. We
investigate via ${ab\ initio}$ density functional theory calculations, the
effects of shear strain on the bulk and surface states n two antiferromagnetic
EuCd$_2$As$_2$ phases with out-of-plane and in-plane spin configurations. When
magnetic moments are along the $\textit{c}$-axis, a $3\%$ longitudinal or
diagonal shear strain can tune the Dirac semimetal phase to an axion insulator
phase, characterized by the parity-based invariant $\eta_{4I} = 2$. For an
in-plane magnetic order, the axion insulator phase remains robust under all
shear strains. We further find that for both magnetic orders, the bulk gap
increases and a surface gap opens on the (001) surface up to 16 meV. Because of
a nonzero $\eta_{4I}$ index and gapped states on the (001) surface, hinge modes
are expected to happen on the side surface states between those gapped surface
states. This result can provide a valuable insight in the realization of the
long-sought axion states.
We develop the theoretical formalism and study the formation of valley trions
in transition metal dichalcogenide (TMDC) monolayers within the framework of a
non-relativistic potential model using the method of hyperspherical harmonics
(HH) in four-dimensional space. We present the solution of the three-body
Schr\"{o}dinger equation with the Rytova-Keldysh (RK) potential by expanding
the wave function of a trion in terms of the HH. The antisymmetrization of
trions wave function is based on the electron and hole spin and valley indices.
We consider a long-range approximation when the RK potential is approximated
by the Coulomb potential and a short-range limit when this potential is
approximated by the logarithmic potential. In a diagonal approximation, the
coupled system of differential equations for the hyperradial functions is
decoupled in both limits. Our approach yields the analytical solution for
binding energy and wave function of trions in the diagonal approximation for
these two limiting cases - the Coulomb and logarithmic potentials. We obtain
exact analytical expressions for eigenvalues and eigenfunctions for negatively
and positively charged trions. The corresponding energy eigenvalues can be
considered as the lower and upper limits for the trions binding energies.
The proposed theoretical approach can describe trions in TMDCs and address
the energy difference between the binding energies of $X^{-}$ and $X^{+}$ in
TMDC. Results of numerical calculations for the ground state energies with the
RK potential are in good agreement with similar calculations and in reasonable
agreement with experimental measurements of trion binding energies.
Inducing and controlling electrostatic barriers in two-dimensional (2D)
quantum materials has shown extraordinary promise to enable control of charge
carriers, and is key for the realization of nanoscale electronic and
optoelectronic devices1-10. Because of their atomically thin nature, the 2D
materials have a congenital advantage to construct the thinnest possible p-n
junctions1,3,7,9,10. To realize the ultimate functional unit for future
nanoscale devices, creating atomically wide electrostatic barriers embedded in
2D materials is desired and remains an extremely challenge. Here we report the
creation and manipulation of atomically wide electrostatic barriers embedded in
graphene WSe2 heterostructures. By using a STM tip, we demonstrate the ability
to generate a one-dimensional (1D) atomically wide boundary between 1T-WSe2
domains and continuously tune positions of the boundary because of
ferroelasticity of the 1T-WSe2. Our experiment indicates that the 1D boundary
introduces atomically wide electrostatic barriers in graphene above it. Then
the 1D electrostatic barrier changes a single graphene WSe2 heterostructure
quantum dot from a relativistic artificial atom to a relativistic artificial
molecule.
Topological phases protected by crystalline symmetries and internal
symmetries are shown to enjoy fascinating one-to-one correspondence in
classification. Here we investigate the physics content behind the abstract
correspondence in three or higher-dimensional systems. We show correspondence
between anomalous boundary states, which provides a new way to explore the
quantum anomaly of symmetry from its crystalline equivalent counterpart. We
show such correspondence directly in two scenarios, including the anomalous
symmetry-enriched topological orders (SET) and critical surface states. (1)
First of all, for the surface SET correspondence, we demonstrate it by
considering examples involving time-reversal symmetry and mirror symmetry. We
show that one 2D topological order can carry the time reversal anomaly as long
as it can carry the mirror anomaly and vice versa, by directly establishing the
mapping of the time reversal anomaly indicators and mirror anomaly indicators.
Besides, we also consider other cases involving continuous symmetry, which
leads us to introduce some new anomaly indicators for symmetry from its
counterpart. (2) Furthermore, we also build up direct correspondence for (near)
critical boundaries. Again taking topological phases protected by time reversal
and mirror symmetry as examples, the direct correspondence of their (near)
critical boundaries can be built up by coupled chain construction that was
first proposed by Senthil and Fisher. The examples of critical boundary
correspondence we consider in this paper can be understood in a unified
framework that is related to \textit{hierarchy structure} of topological $O(n)$
nonlinear sigma model, that generalizes the Haldane's derivation of $O(3)$
sigma model from spin one-half system.
Extreme mechanical processes such as strong lattice distortion and bond
breakage during fracture are ubiquitous in nature and engineering, which often
lead to catastrophic failure of structures. However, understanding the
nucleation and growth of cracks is challenged by their multiscale
characteristics spanning from atomic-level structures at the crack tip to the
structural features where the load is applied. Molecular simulations offer an
important tool to resolve the progressive microstructural changes at crack
fronts and are widely used to explore processes therein, such as mechanical
energy dissipation, crack path selection, and dynamic instabilities (e.g.,
kinking, branching). Empirical force fields developed based on local
descriptors based on atomic positions and the bond orders do not yield
satisfying predictions of fracture, even for the nonlinear, anisotropic
stress-strain relations and the energy densities of edges. High-fidelity force
fields thus should include the tensorial nature of strain and the energetics of
rare events during fracture, which, unfortunately, have not been taken into
account in both the state-of-the-art empirical and machine-learning force
fields. Based on data generated by first-principles calculations, we develop a
neural network-based force field for fracture, NN-F$^3$, by combining
pre-sampling of the space of strain states and active-learning techniques to
explore the transition states at critical bonding distances. The capability of
NN-F$^3$ is demonstrated by studying the rupture of h-BN and twisted bilayer
graphene as model problems. The simulation results confirm recent experimental
findings and highlight the necessity to include the knowledge of electronic
structures from first-principles calculations in predicting extreme mechanical
processes.
We focus on the biorthogonal work statistics of the interacting many-body
Hatano-Nelson model after switching on the imaginary vector potential. We
introduce a generalized Loschmidt echo $G(t)$ utilizing the biorthogonal metric
operator. It is well suited for numerical analysis and its Fourier transform
yields the probability distribution of work done. The statistics of work
displays several universal features, including an exponential decay with the
square of both the system size and imaginary vector potential for the
probability to stay in the ground state. Additionally, its high energy tail
follows a universal power law with exponent $-3$. This originates from the
peculiar temporal power law decay of $G(t)$ with a time dependent exponent. The
mean and the variance of work scale linearly and logarithmically with system
size while all higher cumulants are non-extensive. Our results are relevant for
non-unitary field theories as well.
Sublattices A and B are opposite in the decay direction of the edge state of
the zigzag graphene ribbon (ZGR). Detecting exponential growth from the zigzag
edges to the ZGR center remains challenging. The tight-binding model
calculations in this letter reveal that interlayer conductance manifests this
growth in parallel contact with the armchair nanotube. The transfer integrals
of oblique interlayer bonds are comparable to those of vertical interlayer
bonds. However, the phase of the ZGR wave function strongly suppresses the
contribution of oblique bonds, allowing the selective detection of the growing
component.
The nanoscopic magnetic texture forming in a monolayer of iron on the (111)
surface of iridium, Fe/Ir(111), is spatially modulated and uniaxially
incommensurate with respect to the crystallographic periodicities. As a
consequence, a low-energy magnetic excitation is expected that corresponds to
the sliding of the texture along the incommensurate direction, i.e., a phason
mode, which we explicitly confirm with atomistic spin simulations. Using
scanning tunneling microscopy (STM), we succeed to observe this phason mode
experimentally. It can be excited by the STM tip, which leads to a random
telegraph noise in the tunneling current that we attribute to the presence of
two minima in the phason potential due to the presence of disorder in our
sample. This provides the prospect of a floating phase in cleaner samples and,
potentially, a commensurate-incommensurate transition as a function of external
control parameters.
Most recently the formation of boron monoxide (BO) in the two-dimensional
(2D) form has been confirmed experimentally (J. Am. Chem. Soc. 2023, 145,
14660). Motivated by the aforementioned finding, herein we theoretically
explore the key physical properties of the single-layer and suspended BO.
Density functional theory (DFT) results reveal that BO monolayer yields a large
indirect band gap of 3.78 (2.18) eV on the basis of HSE06(PBE) functional.
Ab-initio molecular dynamics results reveal the remarkable thermal stability of
the BO monolayer at 1000 K. The thermal and mechanical properties at room
temperature are furthermore investigated using a machine learning interatomic
potential (MLIP). The developed MLIP-based model close to the ground state
could very precisely reproduce the DFT predictions for the mechanical
properties of the BO monolayer. The elastic modulus, tensile strength and
lattice thermal conductivity of the BO monolayer at room temperature are
predicted to be 107 GPa, 25 GPa and 5.6 W/mK, respectively. At the room
temperature the BO monolayer is noticeably predicted to yield an ultrahigh
negative thermal expansion coefficient, by almost 17 folds larger than that of
the single-layer graphene. The presented results reveal the large indirect
electronic band gap, decent thermal and dynamical stability, anomalously low
elastic modulus to tensile strength ratio, ultrahigh negative thermal expansion
coefficients and low lattice thermal conductivity of the BO monolayer.
Lattice models with supersymmetry are known to exhibit a variety of
remarkable properties that do not exist in the relativistic models. In this
paper, we introduce an interacting generalization of the Kitaev chain of
Majorana fermions with $\mathcal{N} = 1$ supersymmetry and investigate its
low-energy properties, paying particular attention to the ground-state
degeneracy and low-lying fermionic excitations. First, we establish the
existence of a phase with spontaneously broken supersymmetry and a phase
transition out of it with the help of variational arguments and the exact
ground state. We then develop, based on the superfield formalism, a simple
mean-field theory, in which the order parameters detect supersymmetry-breaking,
to understand the ground-state phases and low-lying Nambu-Goldstone fermions.
At the solvable point ({\em frustration-free point}), the exact ground state of
an open chain exhibits large degeneracy of the order of the system size, which
is attributed to the existence of a zero-energy domain wall (dubbed kink or
skink) separating the topological and trivial states of Majorana fermions. Our
results may shed new light on the intriguing ground-state properties of
supersymmetric lattice models.
Reticular materials, including metal-organic frameworks and covalent organic
frameworks, combine relative ease of synthesis and impressive range of
applications in various fields, from gas storage to biomedicine. Diverse
properties arise from the variation of building units, metal centers and
organic linkers, in an almost infinite chemical space. Such a variability
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 with optional domain knowledge. Nonetheless,
the data-driven inverse design utilizing such models suffers from incorporating
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 the coarse-grained crystal graph that comprises molecular building
units. We assess the predictive performance and energy efficiency of neural
networks built on different materials representations, including
composition-based and crystal-structure-aware models, to highlight the merits
of our approach. Coarse-grained crystal graph neural networks show 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 the inverse materials design pipeline as
estimators of the objective function. Overall, the coarse-grained crystal graph
framework aims to challenge the prevailing atomic-centric perspective on
reticular materials design.
Nitrogen-Vacancy (NV) centers in diamond are promising systems for quantum
technologies, including quantum metrology and sensing. A promising strategy for
the achievement of high sensitivity to external fields relies on the
exploitation of large ensembles of NV centers, whose fabrication by ion
implantation is upper limited by the amount of radiation damage introduced in
the diamond lattice. In this works we demonstrate an approach to increase the
density of NV centers upon the high-fluence implantation of MeV N2+ ions on a
hot target substrate (>550 {\deg}C). Our results show that, with respect to
room-temperature implantation, the high-temperature process increases the
vacancy density threshold required for the irreversible conversion of diamond
to a graphitic phase, thus enabling to achieve higher density ensembles.
Furthermore, the formation efficiency of color centers was investigated on
diamond substrates implanted at varying temperatures with MeV N2+ and Mg+ ions
revealing that the formation efficiency of both NV centers and
magnesium-vacancy (MgV) centers increases with the implantation temperature.
Donor-acceptor (D-A) structured molecules are essential components in organic
electronics. The respective molecular structure of these molecules and their
synthesis are primarily determined by the intended area of application.
Typically, D-A molecules promote charge separation and transport in organic
photovoltaics (OPV) or organic field-effect transistors (OFET). D-A molecules
showing a larger twist angle between D and A units are, e.g., extremely
important for the development of high internal quantum efficiency in organic
light-emitting diodes (OLEDs). A prototypical molecule of this D-A type is
DCzDCN (5-(4,6-diphenyl-1,3,5-triazin-2-yl)benzene-1,3-dinitrile). In most
cases, these molecules are only investigated regarding their electronic and
structural interaction in bulk aggregates but not in ultra-thin films supported
by a metallic substrate. Here, we present growth and electronic structure
studies of DCzDCN on a Cu(100) surface. In a complementary approach, through
the use of Scanning Tunneling Microscopy and Spectroscopy (STM and STS), we
were able to view both the adsorption geometry and the local electronic states
of the adsorbed molecules in direct comparison with the integral electronic
structure of the DCzDCN/CU(100) interface using Ultraviolet and Inverse
Photoemission Spectroscopy (UPS and IPS). The orientation of the molecules with
the donor part towards the substrate results in a chiral resolution at the
interface due to the molecular as well as the substrate symmetry and additional
strong molecular electrostatic forces. Thus, the formation of various
bulk-unlike homochiral structures and the appearance of hybrid interface states
(HIS) modifies the molecular electronic properties of the DCzDCN/Cu(100) system
significantly compared to that of a single DCzDCN molecule. This may be not
only useful for optoelectronic applications but also in organic spintronics.
In this Perspective article we report on recent progress on studies of
synthetic dimensions, mostly, but not only, based on the research realized
around the Barcelona groups (ICFO, UAB), Donostia (DIPC), Pozna\'n (UAM),
Krak\'ow (UJ), and Allahabad (HRI). The concept of synthetic dimensions works
particularly well in atomic physics, quantum optics, and photonics, where the
internal degrees of freedom (Zeeman sublevels of the ground state, metastable
excited states, or motional states for atoms, and angular momentum states or
transverse modes for photons) provide the synthetic space. We describe our
attempts to design quantum simulators with synthetic dimensions, to mimic
curved spaces, artificial gauge fields, lattice gauge theories, twistronics,
quantum random walks, and more.
A glance at recent research on magnetism turns up a curious set of articles
discussing, or claiming evidence for, a state of matter called a quantum spin
liquid (QSL). These articles are notable in their invocation of exotic notions
of topological physics, quantum entanglement, fractional quantum numbers, anyon
statistics and gauge field theories. So what is a QSL and why do we need this
complicated technical vocabulary to describe it? Our aim in this article is to
introduce some of these concepts and provide a discussion of what a QSL is,
where it might occur in Nature and why it is of interest. As we'll see, this is
a rich subject which is still in development, and unambiguous evidence for the
realisation of the QSL state in a magnetic material remains hotly debated.
However, the payoff in terms of the special nature of quantum entanglement in
the QSL, and its diverse spectrum of unusual excitations and topological status
will (at least to some extent) justify the need to engage with some powerful,
occasionally abstract, technical material.
The absorption cross section of M\"{o}ssbauer radiation in magnetic liquids
is calculated, taking into consideration both translational and rotational
Brownian motion of magnetic nanoparticles. Stochastic reversals of their
magnetization are also regarded in the absence of external magnetic field. The
role of Brownian motion in ferrofluids is considered in the framework of the
diffusion theory, while for the magnetorheological fluids with large
nanoparticles it is done in the framework of the Langevin's approach. For
rotation we derived the equation analogous to Langevin's equation and gave the
corresponding correlation function. In both cases the equations for rotation
are solved in the approximation of small rotations during lifetime of the
excited state of M\"{o}ssbauer nuclei. The influence of magnetization
relaxations is studied with the aid of the Blume-Tjon model.
Van der Waals (vdW) magnets are promising owing to their tunable magnetic
properties with doping or alloy composition, where the strength of magnetic
interactions, their symmetry, and magnetic anisotropy can be tuned according to
the desired application. However, most of the vdW magnet based spintronic
devices are so far limited to cryogenic temperatures with magnetic anisotropies
favouring out-of-plane or canted orientation of the magnetization. Here, we
report room-temperature lateral spin-valve devices with strong in-plane
magnetic anisotropy of the vdW ferromagnet (Co0.15Fe0.85)5GeTe2 (CFGT) in
heterostructures with graphene. Magnetization measurements reveal above
room-temperature ferromagnetism in CFGT with a strong in-plane magnetic
anisotropy. Density functional theory calculations show that the magnitude of
the anisotropy depends on the Co concentration and is caused by the
substitution of Co in the outermost Fe layer. Heterostructures consisting of
CFGT nanolayers and graphene were used to experimentally realize basic building
blocks for spin valve devices such as efficient spin injection and detection.
The spin transport and Hanle spin precession measurements prove a strong
in-plane and negative spin polarization at the interface with graphene, which
is supported by the calculated spin-polarized density of states of CFGT. The
in-plane magnetization of CFGT at room temperature proves its usefulness in
graphene lateral spin-valve devices, thus opening further opportunities for
spintronic technologies.
Transition metal dichalcogenides (TMDCs) monolayers, as two-dimensional (2D)
direct bandgap semiconductors, hold promise for advanced optoelectronic and
photocatalytic devices. Interaction with three-dimensional (3D) metals, like
Au, profoundly affects their optical properties, posing challenges in
characterizing the monolayer's optical responses within the semiconductor-metal
junction. In this study, using precise polarization-controlled final-state sum
frequency generation (FS-SFG), we successfully isolated the optical responses
of a MoS$_2$ monolayer from a MoS$_2$/Au junction. The resulting SFG spectra
exhibit a linear lineshape, devoid of A or B exciton features, attributed to
the strong dielectric screening and substrate induced doping. The linear
lineshape illustrates the expected constant density of states (DOS) at the band
edge of the 2D semiconductor, a feature often obscured by excitonic
interactions in week-screening conditions such as in a free-standing monolayer.
Extrapolation yields the onset of a direct quasiparticle bandgap of about
$1.65\pm0.20$ eV, indicating a strong bandgap renormalization. This study not
only enriches our understanding of the optical responses of a 2D semiconductor
in extreme screening conditions but also provides a critical reference for
advancing 2D semiconductor-based photocatalytic applications.
While nanoscale semiconductor crystallites provide versatile fluorescent
materials for light-emitting devices, such nanocrystals suffer from the "dark
exciton"$\unicode{x2014}$an optically inactive electronic state into which the
nanocrystal relaxes before emitting. Recently, a theoretical mechanism was
discovered that can potentially defeat the dark exciton. The Rashba effect can
invert the order of the lowest-lying levels, creating a bright excitonic ground
state. To identify materials that exhibit this behavior, here we perform an
extensive high-throughput computational search of two large open-source
materials databases. Based on a detailed understanding of the Rashba mechanism,
we define proxy criteria and screen over 500,000 solids, generating 173
potential "bright-exciton" materials. We then refine this list with
higher-level first-principles calculations to obtain 28 candidates. To confirm
the potential of these compounds, we select five and develop detailed
effective-mass models to determine the nature of their lowest-energy excitonic
state. We find that four of the five solids (BiTeCl, BiTeI, Ga$_2$Te$_3$, and
KIO$_3$) can yield bright ground-state excitons. Our approach thus reveals
promising materials for future experimental investigation of bright-exciton
nanocrystals.
Topological/perfectly-transmissive defects play a fundamental role in the
analysis of the symmetries of two dimensional conformal field theories (CFTs).
In the present work, spin chain regularizations for these defects are proposed
and analyzed in the case of the three-state Potts CFT. In particular, lattice
versions for all the primitive defects are presented, with the remaining
defects obtained from the fusion of the primitive ones. The defects are
obtained by introducing modified interactions around two given sites of an
otherwise homogeneous spin chain with periodic boundary condition. The various
primitive defects are topological on the lattice except for one, which is
topological only in the scaling limit. The lattice models are analyzed using a
combination of exact diagonalization and density matrix renormalization group
techniques. Low-lying energy spectra for different defect Hamiltonians as well
as entanglement entropy of blocks located symmetrically around the defects are
computed. The latter provides a convenient way to compute the $g$-function
which characterizes various defects. Finally, the eigenvalues of the line
operators in the "crossed channel'' and fusion of different defect lines are
also analyzed. The results are all in agreement with expectations from
conformal field theory.
Fermi-arc surface states of Weyl semimetals exhibit a unique combination of
localization to a surface and connectivity to the bulk Weyl fermions that can
move along the localization direction. We predict anomalous quantum-oscillation
signatures of Fermi arcs in the tunnel mangetoconductance across an interface
between two Weyl semimetals. These oscillations stem from a momentum-space
analog of Aharonov-Bohm interference of electrons moving along the interface
Fermi arcs, driven by an external magnetic field normal to the interface. The
Fermi arcs' connectivity to the bulk enables their characterization via
transport normal to the interface, while their localization manifests in a
strong field-angle anisotropy of the oscillations. This combination
distinguishes these anomalous oscillations from conventional Shubnikov-de Haas
oscillations and makes them identifiable even in complex oscillation spectra of
real materials.
We have carried out density-functional theory (DFT) calculations to study the
magnetic stability of both ferromagnetic (FM) and anti-ferromagnetic (AFM)
states in monolayer 1T-CrTe2. Our results show that the AFM order is lower in
energy and thus is the ground state. By tuning the lattice parameters, the AFM
order can transition to the FM order, in good agreement with experimental
observation. We observe a commensurate SDW alongside the previously predicted
CDW, and attribute the AFM order to the SDW. This results in distinct hole and
electron Fermi pockets and a pronounced optical anisotropy, suggesting
quasi-one-dimensional behavior in this material.
We report a set of scanning tunneling microscopy (STM) and spectroscopy (STS)
experiments studying native defects in CVT grown 1T-TaS$_2$. Six different
sample surfaces from four bulk crystals were investigated. Wide area imaging
reveals a prevalence of nanometer-scale electronic inhomogeneities due to
native defects, with pristine regions interspersed. These inhomogeneities
appear in typical as-grown crystals and coexist with a well-formed commensurate
charge density wave of 1T-TaS$_2$ at low temperatures. Electronic
inhomogeneities show up both as variations in the apparent height in STM and in
the local density of states in STS; the bands can shift by 60 meV and the gap
varies by more than 100 meV across inhomogeneities. These inhomogeneities are
present in similar concentration across large-scale areas of all samples
studied, but do not influence the charge density wave formation on local or
global scales. The commensurate charge density wave exhibits long-range order
and remains locally intact in the presence of these inhomogeneities.
The variety of correlated phenomena in moir\'e systems is incredibly rich,
spanning effects such as superconductivity, a generalized form of
ferromagnetism, or even charge fractionalization. This wide range of quantum
phenomena is partly enabled by the large number of internal degrees of freedom
in these systems, such as the valley and spin degrees of freedom, which
interplay decides the precise nature of the ground state. Identifying the
microscopic nature of the correlated states in the moir\'e systems is, however,
challenging, as it relies on interpreting transport behavior or
scanning-tunneling microscopy measurements. Here we show how the real-space
structure of collective charge oscillations of the correlated orders can
directly encode information about the structure of the correlated state,
focusing in particular on the problem of generalized Wigner crystals in moir\'e
transition metal dichalcogenides. Our analysis builds upon our earlier result
[10.1126/sciadv.adg3262] that the presence of a generalized Wigner crystal
modifies the plasmon spectrum of the system, giving rise to new collective
modes. We focus on scanning near-field optical microscopy technique (SNOM),
fundamentally a charge-sensing-based method, and introduce a regime under which
SNOM can operate as a probe of the spin degree of freedom.
Two-dimensional (2D) semiconductors, such as the transition metal
dichalcogenides, have demonstrated tremendous promise for the development of
highly tunable quantum devices. Realizing this potential requires
low-resistance electrical contacts that perform well at low temperatures and
low densities where quantum properties are relevant. Here we present a new
device architecture for 2D semiconductors that utilizes a charge-transfer layer
to achieve large hole doping in the contact region, and implement this
technique to measure magneto-transport properties of high-purity monolayer
WSe$_2$. We measure a record-high hole mobility of 80,000 cm$^2$/Vs and access
channel carrier densities as low as $1.6\times10^{11}$ cm$^{-2}$, an order of
magnitude lower than previously achievable. Our ability to realize transparent
contact to high-mobility devices at low density enables transport measurement
of correlation-driven quantum phases including observation of a low temperature
metal-insulator transition in a density and temperature regime where Wigner
crystal formation is expected, and observation of the fractional quantum Hall
effect under large magnetic fields. The charge transfer contact scheme paves
the way for discovery and manipulation of new quantum phenomena in 2D
semiconductors and their heterostructures.
We study the effect of inter-electron Coulomb interactions on the
displacement field induced topological phase transition in transition metal
dichalcogenide (TMD) moir\'e heterobilayers. We find a nematic excitonic
insulator (NEI) phase that breaks the moir\'e superlattice's three-fold
rotational symmetry and preempts the topological phase transition in both AA
and AB stacked heterobilayers when the interlayer tunneling is weak, or when
the Coulomb interaction is not strongly screened. The nematicity originates
from the frustration between the nontrivial spatial structure of the interlayer
tunneling, which is crucial to the existence of the topological Chern band, and
the interlayer coherence induced by the Coulomb interaction that favors
uniformity in layer pseudo-spin orientations. We construct a unified effective
two-band model that captures the physics near the band inversion and applies to
both AA and AB stacked heterobilayers. Within the two-band model, the
competition between the NEI phase and the Chern insulator phase can be
understood as the switching of the energetic order between the $s$-wave and the
$p$-wave excitons upon increasing the interlayer tunneling.
Recent experiments on geometrically frustrated kagome metal AV3Sb5 (A=K, Rb,
Cs) have revealed the emergence of the charge loop current (cLC) order near the
bond order (BO) phase. However, the origin of the cLC and its relation to other
phases have been uncovered. Here, we discover a novel mechanism of the cLC
state, by focusing on the BO phase common in kagome metals. The BO fluctuations
in metals mediate the odd-parity particle-hole condensation, which drives the
topological charge-current. This state is further stabilized by the finite
electron-phonon coupling and the off-site Coulomb interaction. Furthermore, it
is worth noting that the predicted cLC+BO phase gives rise to the Z3-nematic
state in addition to the giant anomalous Hall effect. The present theory
predicts the close relationship between the cLC, the BO, and the nematicity,
which is significant to understand the cascade of quantum electron states in
kagome metals.
We demonstrate the existence of topologically stable unpaired exceptional
points (EPs), and construct simple non-Hermitian (NH) tight-binding models
exemplifying such remarkable nodal phases. While fermion doubling, i.e. the
necessity of compensating the topological charge of a stable nodal point by an
anti-dote, rules out a direct counterpart of our findings in the realm of
Hermitian semimetals, here we derive how noncommuting braids of complex energy
levels may stabilize unpaired EPs. Drawing on this insight, we reveal the
occurrence of a single, unpaired EP, manifested as a non-Abelian monopole in
the Brillouin zone of a minimal three-band model. This third-order degeneracy
represents a sweet spot within a larger topological phase that cannot be fully
gapped by any local perturbation. Instead, it may only split into simpler
(second-order) degeneracies that can only gap out by pairwise annihilation
after having moved around inequivalent large circles of the Brillouin zone. Our
results imply the incompleteness of a topological classification based on
winding numbers, due to non-Abelian representations of the braid group
intertwining three or more complex energy levels, and provide insights into the
topological robustness of non-Hermitian systems and their non-Abelian phase
transitions.
In this paper, we study the synchronization of identical Kuramoto phase
oscillators under cumulative stochastic damage to the edges of networks. We
analyze the capacity of coupled oscillators to reach a coherent state from
initial random phases. The process of synchronization is a global function
performed by a system that gradually changes when the damage weakens individual
connections of the network. We explore diverse structures characterized by
different topologies. Among these are deterministic networks as a wheel or the
lattice formed by the movements of the knight on a chess board, and random
networks generated with the Erd\H{o}s-R\'enyi and Barab\'asi-Albert algorithms.
In addition, we study the synchronization times of 109 non-isomorphic graphs
with six nodes. The synchronization times and other introduced quantities are
sensitive to the impact of damage, allowing us to measure the reduction of the
capacity of synchronization and classify the effect of damage in the systems
under study. This approach is general and paves the way for the exploration of
the effect of damage accumulation in diverse dynamical processes in complex
systems.
The unique spin texture of quantum states in topological materials underpins
many proposed spintronic applications. However, realizations of such great
potential are stymied by perturbations, such as temperature and local fields
imposed by impurities and defects, that can render a promising quantum state
uncontrollable. Here, we report room-temperature observation of interaction
between Rashba states and topological surface states, which manifests unique
spin textures controllable by layer thickness of thin films. Specifically, we
combine scanning tunneling microscopy/spectroscopy with the first-principles
theoretical calculation to find the robust Rashba states coexisting with
topological surface states along the surface steps with characteristic spin
textures in momentum space. The Rashba edge states can be switched off by
reducing the thickness of a topological insulator Bi2Se3 to bolster their
interaction with the hybridized topological surface states. The study unveils a
manipulating mechanism of the spin textures at room temperature, reinforcing
the necessity of thin film technology in controlling quantum states.
We study entanglement entropy of unusual $\mathbb{Z}_N$ topological
stabilizer codes which admit fractional excitations with restricted mobility
constraint in a manner akin to fracton topological phases. It is widely known
that the sub-leading term of the entanglement entropy of a disk geometry in
conventional topologically ordered phases is related to the total number of the
quantum dimension of the fractional excitations. We show that, in our model,
such a relation does not hold, i.e, the total number of the quantum dimension
varies depending on the system size, whereas the sub-leading term of the
entanglement entropy takes a constant number irrespective to the system size.
We give a physical interpretation of this result in the simplest case of the
model. More thorough analysis on the entanglement entropy of the model on
generic lattices is also presented.
In the Standard Model, some combination of the baryon $\bf B$ and lepton $\bf
L$ number symmetry is free of mixed anomalies with strong and electroweak
$su(3) \times su(2) \times u(1)_{\tilde Y}$ gauge forces. However, it can still
suffer from a mixed gravitational anomaly, hypothetically pertinent to
leptogenesis in the very early universe. This happens when the total "sterile
right-handed" neutrino number $n_{\nu_R}$ is not equal to the family number
$N_f$. Thus the invertible $\bf B - L$ symmetry current conservation can be
violated quantum mechanically by gravitational backgrounds such as
gravitational instantons. In specific, we show that a noninvertible categorical
$\bf B - L$ generalized symmetry still survives in gravitational backgrounds.
In general, we propose a construction of noninvertible symmetry charge
operators as topological defects derived from invertible anomalous symmetries
that suffer from mixed gravitational anomalies. Examples include the
perturbative local and nonperturbative global anomalies classified by
$\mathbb{Z}$ and $\mathbb{Z}_{16}$ respectively. For this construction, we
utilize the anomaly inflow bulk-boundary correspondence, the 4d Pontryagin
class and the gravitational Chern-Simons 3-form, the 3d
Witten-Reshetikhin-Turaev-type topological quantum field theory corresponding
to a 2d rational conformal field theory with an appropriate rational chiral
central charge, and the 4d $\mathbb{Z}_4^{\rm TF}$-time-reversal symmetric
topological superconductor with 3d boundary topological order.
We demonstrate the general existence of a local dipole conservation law in
bosonic field theory. The scalar charge density arises from the symplectic form
of the system, whereas the tensor current descends from its stress tensor. The
algebra of spatial translations becomes centrally extended in presence of field
configurations with a finite nonzero charge. Furthermore, when the symplectic
form is closed but not exact, the system may, surprisingly, lack a well-defined
momentum density. This leads to a theorem for the presence of additional light
modes in the system whenever the short-distance physics is governed by a
translationally invariant local field theory. We also illustrate this mechanism
for axion electrodynamics as an example of a system with Nambu-Goldstone modes
of higher-form symmetries.
The B phase of superfluid 3He can be cooled into the pure superfluid regime,
where the thermal quasiparticle density is negligible. The bulk superfluid is
surrounded by a quantum well at the boundaries of the container, confining a
sea of quasiparticles with energies below that of those in the bulk. We can
create a non-equilibrium distribution of these states within the quantum well
and observe the dynamics of their motion indirectly. Here we show that the
induced quasiparticle currents flow diffusively in the two-dimensional system.
Combining this with a direct measurement of energy conservation, we conclude
that the bulk superfluid 3He is effectively surrounded by an independent
two-dimensional superfluid, which is isolated from the bulk superfluid but
which readily interacts with mechanical probes. Our work shows that this
two-dimensional quantum condensate and the dynamics of the surface bound states
are experimentally accessible, opening the possibility of engineering
two-dimensional quantum condensates of arbitrary topology.
Fourier neural operators (FNOs) can learn highly nonlinear mappings between
function spaces, and have recently become a popular tool for learning responses
of complex physical systems. However, to achieve good accuracy and efficiency,
FNOs rely on the Fast Fourier transform (FFT), which is restricted to modeling
problems on rectangular domains. To lift such a restriction and permit FFT on
irregular geometries as well as topology changes, we introduce domain agnostic
Fourier neural operator (DAFNO), a novel neural operator architecture for
learning surrogates with irregular geometries and evolving domains. The key
idea is to incorporate a smoothed characteristic function in the integral layer
architecture of FNOs, and leverage FFT to achieve rapid computations, in such a
way that the geometric information is explicitly encoded in the architecture.
In our empirical evaluation, DAFNO has achieved state-of-the-art accuracy as
compared to baseline neural operator models on two benchmark datasets of
material modeling and airfoil simulation. To further demonstrate the capability
and generalizability of DAFNO in handling complex domains with topology
changes, we consider a brittle material fracture evolution problem. With only
one training crack simulation sample, DAFNO has achieved generalizability to
unseen loading scenarios and substantially different crack patterns from the
trained scenario. Our code and data accompanying this paper are available at
https://github.com/ningliu-iga/DAFNO.
The Clifford spectrum is a form of joint spectrum for noncommuting matrices.
This theory has been applied in photonics, condensed matter and string theory.
In applications, the Clifford spectrum can be efficiently approximated using
numerical methods, but this only is possible in low dimensional example. Here
we examine the higher-dimensional spheres that can arise from theoretical
examples. We also describe a constuctive method to generate five real symmetric
almost commuting matrices that have a $K$-theoretical obstruction to being
close to commuting matrices. For this, we look to matrix models of topological
electric circuits.
The efficient optical second-harmonic generation (SHG) of two-dimensional
(2D) crystals, coupled with their atomic thickness that circumvents the
phase-match problem, has garnered considerable attention. While various 2D
heterostructures have shown promising applications in photodetectors, switching
electronics, and photovoltaics, the modulation of nonlinear optical properties
in such hetero-systems remains unexplored. In this study, we investigate
exciton sensitized SHG in heterobilayers of transition metal dichalcogenides
(TMDs), where photoexcitation of one donor layer enhances the SHG response of
the other as an acceptor. We utilize polarization-resolved interferometry to
detect the SHG intensity and phase of each individual layer, revealing the
energetic match between the excitonic resonances of donors and the SHG
enhancement of acceptors for four TMD combinations. Our results also uncover
the dynamic nature of interlayer coupling, as evidenced by the dependence of
sensitization on interlayer gap spacing and the average power of the
fundamental beam. This work provides insights into how interlayer coupling of
two different layers can modify nonlinear optical phenomena in 2D
heterostructures.
We investigate the interaction between a monolayer of WS2 and a chiral
plasmonic metasurface. WS2 possesses valley excitons that selectively couple
with one-handed circularly polarised light. At the same time, the chiral
plasmonic metasurface exhibits spin-momentum locking, leading to a robust
polarisation response in the far field. Using a scattering formalism based on
the coupled mode method, we analyse various optical properties of the WS2
monolayer. Specifically, we demonstrate the generation of circular dichroism in
the transition metal dichalcogenide (TMD) by harnessing the excitation of
surface plasmon polaritons (SPPs) in the metasurface. Moreover, we observe the
emergence of other guided modes, opening up exciting possibilities for further
exploration in TMD-based devices.
A fundamental requirement for quantum technologies is the ability to
coherently control the interaction between electrons and photons. However, in
many scenarios involving the interaction between light and matter, the exchange
of linear or angular momentum between electrons and photons is not feasible, a
condition known as the dipole-approximation limit. An example of a case beyond
this limit that has remained experimentally elusive is when the interplay
between chiral electrons and vortex light is considered, where the orbital
angular momentum of light can be transferred to electrons. Here, we present a
novel mechanism for such an orbital angular momentum transfer from optical
vortex beams to electronic quantum Hall states. Specifically, we identify a
robust contribution to the radial photocurrent, in an annular graphene sample
within the quantum Hall regime, that depends on the vorticity of light. This
phenomenon can be interpreted as an optical pumping scheme, where the angular
momentum of photons is transferred to electrons, generating a radial current,
and the current direction is determined by the vorticity of the light. Our
findings offer fundamental insights into the optical probing and manipulation
of quantum coherence, with wide-ranging implications for advancing quantum
coherent optoelectronics.
Spin torque oscillators are conventionally described by the
Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. However, at the onset of
oscillations, the predictions of the conventional LLGS equation differ
qualitatively from experimental results and thus appear to be incomplete. In
this work we show that taking charge conservation into account leads to a
previously-overlooked self-induced torque, which modifies the LLGS equation. We
show that the self-induced torque originates from the pumping current that a
precessing magnetization drives through a magnetic tunnel junction. To
illustrate the importance of the self-induced torque, we consider an in-plane
magnetized nanopillar, where it gives clear qualitative corrections to the
conventional LLGS description.
We study theoretically the effect of electronic interactions in 1d systems on
electron injection using periodic Lorentzian pulses, known as Levitons. We
consider specifically a system composed of a metallic single-wall carbon
nanotube, described with the Luttinger liquid formalism, a scanning tunneling
microscope (STM) tip, and metallic leads. Using the out-of-equilibrium Keldysh
Green function formalism, we compute the current and current noise in the
system. We prove that the excess noise vanishes when each Leviton injects an
integer number of electrons from the STM tip into the nanotube. This extends
the concept of minimal injection with Levitons to strongly correlated,
uni-dimensional non-chiral systems. We also study the time-dependent current
profile, and show how it is the result of interferences between pulses
non-trivially reflected at the nanotube-lead interface.
We formulate a general framework to study the flow of the electron liquid in
two dimensions past a random array of impenetrable obstacles in the presence of
a magnetic field. We derive a linear-response formula for the resistivity
tensor $\hat\rho$ in hydrodynamics with obstacles, which expresses $\hat\rho$
in terms of the vorticity and its harmonic conjugate, both on the boundary of
obstacles. In the limit of rare obstacles, in which we calculate $\hat\rho$,
the contributions of the flow-induced electric field to the dissipative
resistivity from the area covered by the liquid and the area inside obstacles
are shown to be equal to each other. We demonstrate that the averaged electric
fields outside and inside obstacles are rotated by Hall viscosity from the
direction of flow. For the diffusive boundary condition on the obstacles, this
effect exactly cancels in $\hat\rho$. By contrast, for the specular boundary
condition, the total electric field is rotated by Hall viscosity, which means
the emergence of a Hall-viscosity-induced effective -- proportional to the
obstacle density -- magnetic field. Its effect on the Hall resistivity is
particularly notable in that it leads to a deviation of the Hall constant from
its universal value. We show that the applied magnetic field enhances
hydrodynamic lubrication, giving rise to a strong negative magnetoresistance.
We combine the hydrodynamic and electrostatic perspectives by discussing the
distribution of charges that create the flow-induced electric field around
obstacles. We provide a connection between the tensor $\hat\rho$ and the
disorder-averaged electric dipole induced by viscosity at the obstacle. This
establishes a conceptual link between the resistivity in hydrodynamics with
obstacles and the notion of the Landauer dipole. We show that the
viscosity-induced dipole is rotated from the direction of flow by Hall
viscosity.
Quantum vortices in atomic Bose-Einstein condensates (BECs) are topological
defects characterized by quantized circulation of particles around them. In
experimental studies, vortices are commonly detected by time-of-flight imaging,
where their density-depleted cores are enlarged. In this work, we describe a
machine learning-based method for detecting vortices in experimental BEC
images, particularly focusing on turbulent condensates containing irregularly
distributed vortices. Our approach employs a convolutional neural network (CNN)
trained solely on synthetic simulated images, eliminating the need for manual
labeling of the vortex positions as ground truth. We find that the CNN achieves
accurate vortex detection in real experimental images, thereby facilitating
analysis of large experimental datasets without being constrained by specific
experimental conditions. This novel approach represents a significant
advancement in studying quantum vortex dynamics and streamlines the analysis
process in the investigation of turbulent BECs.
Symmetries and their anomalies give strong constraints on renormalization
group (RG) flows of quantum field theories. Recently, the identification of a
theory's global symmetries with its topological sector has provided additional
constraints on RG flows to symmetry preserving gapped phases due to
mathematical results in category and topological quantum field theory. In this
paper, we derive constraints on RG flows from $\mathbb{Z}_2$-valued pure- and
mixed-gravitational anomalies that can only be activated on non-spin manifolds.
We show that such anomalies cannot be matched by a unitary, symmetry preserving
gapped phase without symmetry fractionalization. In particular, we discuss
examples that commonly arise in $4d$ gauge theories with fermions.
Xenes, two-dimensional (2D) monolayers composed of a single element, with
graphene as a typical representative, have attracted widespread attention. Most
of the previous Xenes, X from group-IIIA to group-VIA elements have bonding
characteristics of covalent bonds. In this work, we for the first time unveil
the pivotal role of a halogen bond, which is a distinctive type of bonding with
interaction strength between that of a covalent bond and a van der Waals
interaction, in 2D group-VIIA monolayers. Combing the ingenious
non-edge-to-edge tiling theory and state-of-art ab initio method with refined
local density functional M06-L, we provide a precise and effective bottom-up
construction of 2D iodine monolayer sheets, iodinenes, primarily governed by
halogen bonds, and successfully design a category of stable iodinenes,
encompassing herringbone, Pythagorean, gyrated truncated hexagonal, i.e.
diatomic-kagome, and gyrated hexagonal tiling pattern. These iodinene
structures exhibit a wealth of properties, such as flat bands, nontrivial
topology, and fascinating optical characteristics, offering valuable insights
and guidance for future experimental investigations. Our work not only unveils
the unexplored halogen bonding mechanism in 2D materials but also opens a new
avenue for designing other non-covalent bonding 2D materials.
The ground state of the toric code, that of the two-dimensional class D
superconductor, and the partition sum of the two-dimensional Ising model are
dual to each other. This duality is remarkable inasmuch as it connects systems
commonly associated to different areas of physics -- that of long range
entangled topological order, (topological) band insulators, and classical
statistical mechanics, respectively. Connecting fermionic and bosonic systems,
the duality construction is intrinsically non-local, a complication that has
been addressed in a plethora of different approaches, including dimensional
reduction to one dimension, conformal field theory methods, and operator
algebra. In this work, we propose a unified approach to this duality, whose
main protagonist is a tensor network (TN) assuming the role of an intermediate
translator. Introducing a fourth node into the net of dualities offers several
advantages: the formulation is integrative in that all links of the duality are
treated on an equal footing, (unlike in field theoretical approaches) it is
formulated with lattice precision, a feature that becomes key in the mapping of
correlation functions, and their possible numerical implementation. Finally,
the passage from bosons to fermions is formulated entirely within the
two-dimensional TN framework where it assumes an intuitive and technically
convenient form. We illustrate the predictive potential of the formalism by
exploring the fate of phase transitions, point and line defects, topological
boundary modes, and other structures under the mapping between system classes.
Having condensed matter readerships in mind, we introduce the construction
pedagogically in a manner assuming only minimal familiarity with the concept of
TNs.
Despite the fundamental importance of solid-solid transformations in many
technologies, the microscopic mechanisms remain poorly understood. Here, we
explore the atomistic mechanisms at the migrating interface during solid-solid
phase transformations between the topologically closed-packed A15 and
body-centred cubic phase in tungsten. The high energy barriers and slow
dynamics associated with this transformation require the application of
enhanced molecular sampling approaches. To this end, we performed metadynamics
simulations in combination with a path collective variable derived from a
machine learning classification of local structural environments, which allows
the system to freely sample the complex interface structure. A disordered
region of varying width forming at the migrating interface is identified as a
key physical descriptor of the transformation mechanisms, facilitating the
atomic shuffling and rearrangement necessary for structural transformations.
Furthermore, this can directly be linked to the differences in interface
mobility for distinct orientation relationships as well as the formation of
interfacial ledges during the migration along low-mobility directions.
We systematically explore the structural and electronic properties of twisted
trilayer graphene systems. In general, these systems are characterized by two
twist angles, which lead to two incommensurate moir\'{e} periods. We show that
lattice relaxation results in the formation of domains of periodic
single-moir\'{e} structures only for twist angles close to the simplest
fractions. For the majority of other twist angles, the incommensurate moir\'{e}
periods lead to a quasicrystalline structure. We identify experimentally
relevant magic angles at which the electronic density of states is sharply
peaked and strongly correlated physics is most likely to be realized.
Multifunctional coatings are central for information, biomedical,
transportation and energy technologies. These coatings must possess
hard-to-attain properties and be scalable, adaptable, and sustainable, which
makes layer-by-layer assembly (LBL) of nanomaterials uniquely suitable for
these technologies. What remains largely unexplored is that LBL enables
computational methodologies for structural design of these composites.
Utilizing silver nanowires (NWs), we develop and validate a graph theoretical
(GT) description of their LBL composites. GT successfully describes the
multilayer structure with nonrandom disorder and enables simultaneous rapid
assessment of several properties of electrical conductivity, electromagnetic
transparency, and anisotropy. GT models for property assessment can be rapidly
validated due to (1) quasi-2D confinement of NWs and (2) accurate microscopy
data for stochastic organization of the NW networks. We finally show that
spray-assisted LBL offers direct translation of the GT-based design of
composite coatings to additive, scalable manufacturing of drone wings with
straightforward extensions to other technologies.

Date of feed: Tue, 31 Oct 2023 00:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Comparison of grain growth mean-field models regarding predicted grain size distributions. (arXiv:2310.18317v1 [cond-mat.mtrl-sci])**

Marion Roth, Baptiste Flipon, Nathalie Bozzolo, Marc Bernacki

**Photonic lattices of coaxial cables: flat bands and artificial magnetic fields. (arXiv:2310.18325v1 [physics.optics])**

Christopher Oliver, Denis Nabari, Hannah M. Price, Leonardo Ricci, Iacopo Carusotto

**Translation-invariant relativistic Langevin equation derived from first principles. (arXiv:2310.18327v1 [cond-mat.stat-mech])**

Filippo Emanuele Zadra, Aleksandr Petrosyan, Alessio Zaccone

**Exciton-exciton interactions in van der Waals heterobilayers. (arXiv:2310.18328v1 [cond-mat.mes-hall])**

Alexander Steinhoff, Edith Wietek, Matthias Florian, Tommy Schulz, Takashi Taniguchi, Kenji Watanabe, Shen Zhao, Alexander Högele, Frank Jahnke, Alexey Chernikov

**The fundamental unit of quantum conductance and quantum diffusion for a gas of massive particles. (arXiv:2310.18372v1 [cond-mat.mes-hall])**

Lino Reggiani, Eleonora Alfinito, Federico Intini

**Engineering the Kitaev spin liquid in a quantum dot system. (arXiv:2310.18393v1 [cond-mat.mes-hall])**

Tessa Cookmeyer, Sankar Das Sarma

**Isotropic 3D topological phases with broken time reversal symmetry. (arXiv:2310.18400v1 [cond-mat.mes-hall])**

Helene Spring, Anton R. Akhmerov, Daniel Varjas

**Machine learning detecting Majorana Zero Mode from Zero Bias Peak measurements. (arXiv:2310.18439v1 [cond-mat.mes-hall])**

Mouyang Cheng, Ryotaro Okabe, Abhijatmedhi Chotrattanapituk, Mingda Li

**Weyl points on non-orientable manifolds. (arXiv:2310.18485v1 [cond-mat.mes-hall])**

André Grossi e Fonseca, Sachin Vaidya, Thomas Christensen, Mikael C. Rechtsman, Taylor L. Hughes, Marin Soljačić

**Einstein-de Haas torque as a discrete spectroscopic probe allows nanomechanical measurement of a magnetic resonance. (arXiv:2310.18546v1 [cond-mat.mes-hall])**

K.R. Fast, J.E. Losby, G. Hajisalem, P.E. Barclay, M.R. Freeman

**Quantum Interactions in Topological R166 Kagome Magnet. (arXiv:2310.18559v1 [cond-mat.str-el])**

Xitong Xu, Jia-Xin Yin, Zhe Qu, Shuang Jia

**Varying magnetism in the lattice distorted Y2NiIrO6 and La2NiIrO6. (arXiv:2310.18641v1 [cond-mat.mtrl-sci])**

Lu Liu, Ke Yang, Di Lu, Yaozhenghang Ma, Yuxuan Zhou, Hua Wu

**Defect-influenced particle advection in highly confined liquid crystal flows. (arXiv:2310.18667v1 [cond-mat.soft])**

Magdalena Lesniewska, Nigel Mottram, Oliver Henrich

**Simultaneous embedding of multiple attractor manifolds in a recurrent neural network using constrained gradient optimization. (arXiv:2310.18708v1 [q-bio.NC])**

Haggai Agmon, Yoram Burak

**Ultrafast Electron Diffuse Scattering as a Tool for Studying Phonon Transport: Phonon Hydrodynamics and Second Sound Oscillations. (arXiv:2310.18793v1 [cond-mat.mes-hall])**

Laurenz Kremeyer, Tristan L. Britt, Bradley J. Siwick, Samuel C. Huberman

**Donor-acceptor recombination emission in hydrogen-terminated nanodiamond: Novel single-photon source for room-temperature quantum photonics. (arXiv:2310.18822v1 [quant-ph])**

D. G. Pasternak, A. M. Romshin, R. H. Bagramov, A. I. Galimov, A. A. Toropov, D. A. Kalashnikov, V. Leong, A. M. Satanin, O. S. Kudryavtsev, A. L. Chernev, V. P. Filonenko, I. I. Vlasov

**Topological, or Non-topological? A Deep Learning Based Prediction. (arXiv:2310.18907v1 [cond-mat.mtrl-sci])**

Ashiqur Rasul, Md Shafayat Hossain, Ankan Ghosh Dastider, Himaddri Roy, M. Zahid Hasan, Quazi D. M. Khosru

**Band Structure of Topological Insulator BiSbTe1.25Se1.75. (arXiv:2310.18922v1 [cond-mat.mtrl-sci])**

H. Lohani, P. Mishra, A. Banerjee, K. Majhi, R. Ganesan, U. Manju, D. Topwal, P. S. Anil Kumar, B. R. Sekhar

**Investigation of correlation effects in FeSe and FeTe by LDA + U method. (arXiv:2310.18994v1 [cond-mat.supr-con])**

H. Lohani, P. Mishra, B.R. Sekhar

**Higher-order topological corner and bond-localized modes in magnonic insulators. (arXiv:2310.19010v1 [cond-mat.mes-hall])**

Sayak Bhowmik, Saikat Banerjee, Arijit Saha

**Valence band electronic structure of Pd based ternary chalcogenide superconductors. (arXiv:2310.19016v1 [cond-mat.supr-con])**

H. Lohani, P. Mishra, R. Goyal, V.P.S. Awana, B.R. Sekhar

**Stacking Group Structure of Fermionic Symmetry-Protected Topological Phases. (arXiv:2310.19058v1 [cond-mat.str-el])**

Xing-Yu Ren, Shang-Qiang Ning, Yang Qi, Qing-Rui Wang, Zheng-Cheng Gu

**Intrinsic Third Order Nonlinear Transport Responses. (arXiv:2310.19092v1 [cond-mat.mes-hall])**

Debottam Mandal, Sanjay Sarkar, Kamal Das, Amit Agarwal

**Observation of Dirac-like surface state bands on the top surface of BiSe. (arXiv:2310.19150v1 [cond-mat.mtrl-sci])**

H. Lohani, K. Majhi, R. Ganesan, S. Gonzalez, G. Di Santo, L. Petaccia, P. S. Anil Kumar, B. R. Sekhar

**Strain control of band topology and surface states in antiferromagnetic EuCd$_2$As$_2$. (arXiv:2310.19186v1 [cond-mat.str-el])**

Nayra A. Álvarez Pari, V. K. Bharadwaj, R. Jaeschke-Ubiergo, A. Valadkhani, Roser Valentí, L. Šmejkal, Jairo Sinova

**Trions in monolayer transition metal dichalcogenides within the hyperspherical harmonics method. (arXiv:2310.19196v1 [cond-mat.mes-hall])**

Roman Ya. Kezerashvili, Shalva M.Tsiklauri, Andrew Dublin

**Tunable Atomically Wide Electrostatic Barriers Embedded in a Graphene WSe2 Heterostructure. (arXiv:2310.19238v1 [cond-mat.mes-hall])**

Hui-Ying Ren, Yue Mao, Ya-Ning Ren, Qing-Feng Sun, Lin He

**Anomalous boundary correspondence of topological phases. (arXiv:2310.19266v1 [cond-mat.str-el])**

Jian-Hao Zhang, Shang-Qiang Ning

**A Planning-and-Exploring Approach to Extreme-Mechanics Force Fields. (arXiv:2310.19306v1 [cond-mat.mtrl-sci])**

Pengjie Shi, Zhiping Xu

**Work statistics and generalized Loschmidt echo for the Hatano-Nelson model. (arXiv:2310.19310v1 [cond-mat.stat-mech])**

Balázs Dóra, Cătălin Paşcu Moca

**Interlayer Conductance in the Armchair Nanotube -- Zigzag Graphene Ribbon Parallel Contact: Theoretical Proposal of Detection of Wavefunction Growing from the Edge to the Center in the Graphene Ribbon. (arXiv:2310.19361v1 [cond-mat.mes-hall])**

Ryo Tamura

**Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111). (arXiv:2310.19484v1 [cond-mat.mtrl-sci])**

Hung-Hsiang Yang, Louise Desplat, Volodymyr P. Kravchuk, Marie Hervé, Timofey Balashov, Simon Gerber, Markus Garst, Bertrand Dupé, Wulf Wulfhekel

**Anomalous tensile strength and thermal expansion, and low thermal conductivity in wide band gap boron monoxide monolayer. (arXiv:2310.19485v1 [cond-mat.mes-hall])**

Bohayra Mortazavi, Fazel Shojaei, Fei Ding, Xiaoying Zhuang

**Interacting Kitaev Chain with $\mathcal{N}=1$ Supersymmetry. (arXiv:2310.19493v1 [cond-mat.str-el])**

Urei Miura, Kenji Shimomura, Keisuke Totsuka

**Coarse-grained crystal graph neural networks for reticular materials design. (arXiv:2310.19500v1 [cond-mat.mtrl-sci])**

Vadim Korolev, Artem Mitrofanov

**Efficient fabrication of high-density ensembles of color centers via ion implantation on a hot diamond substrate. (arXiv:2310.19526v1 [cond-mat.mtrl-sci])**

E. Nieto Hernandez, G. Andrini, A. Crnjac, M. Brajkovic, F. Picariello, E. Corte, V. Pugliese, M. Matijević, P. Aprà, V. Varzi, J. Forneris, M. Genovese, Z. Siketic, M. Jaksic, S. Ditalia Tchernij

**Self-assembly of the chiral donor-acceptor molecule DCzDCN on Cu(100). (arXiv:2310.19534v1 [cond-mat.mtrl-sci])**

Robert Ranecki, Benedikt Baumann, Stefan Lach, Christiane Ziegler

**Synthetic dimensions for topological and quantum phases: Perspective. (arXiv:2310.19549v1 [quant-ph])**

Javier Argüello-Luengo, Utso Bhattacharya, Alessio Celi, Ravindra W. Chhajlany, Tobias Grass, Marcin Płodzień, Debraj Rakshit, Tymoteusz Salamon, Paolo Stornati, Leticia Tarruell, Maciej Lewenstein

**Quantum spin liquids. (arXiv:2310.19577v1 [cond-mat.str-el])**

T. Lancaster

**Role of Brownian motion and N\'{e}el relaxations in Mossbauer spectra of magnetic liquids. (arXiv:2310.19599v1 [cond-mat.mtrl-sci])**

A. Ya. Dzyublik, V. Yu. Spivak

**Strong in-plane magnetic anisotropy (Co0.15Fe0.85)5GeTe2/graphene van der Waals heterostructure spin-valve at room temperature. (arXiv:2310.19618v1 [cond-mat.mes-hall])**

Roselle Ngaloy, Bing Zhao, Soheil Ershadrad, Rahul Gupta, Masoumeh Davoudiniya, Lakhan Bainsla, Lars Sjöström, Anamul M. Hoque, Alexei Kalaboukhov, Peter Svedlindh, Biplab Sanyal, Saroj P. Dash

**Isolating the Nonlinear Optical Response of a MoS$_2$ Monolayer under Extreme Screening of a Metal Substrate. (arXiv:2310.19657v1 [cond-mat.mes-hall])**

Tao Yang, Stephan Sleziona, Erik Pollmann, Eckart Hasselbrink, Peter Kratzer, Marika Schleberger, R. Kramer Campen, Yujin Tong

**Double-Rashba materials for nanocrystals with bright ground-state excitons. (arXiv:2310.19678v1 [cond-mat.mtrl-sci])**

Michael W. Swift, Peter C. Sercel, Alexander L. Efros, John L. Lyons, David J. Norris

**Lattice Realizations of Topological Defects in the critical (1+1)-d Three-State Potts Model. (arXiv:2310.19703v1 [hep-th])**

Madhav Sinha, Fei Yan, Linnea Grans-Samuelsson, Ananda Roy, Hubert Saleur

**Quantum Oscillation Signatures of Fermi Arcs in Tunnel Magnetoconductance. (arXiv:2310.19720v1 [cond-mat.mes-hall])**

Adam Yanis Chaou, Vatsal Dwivedi, Maxim Breitkrei

**Magnetic Stability, Fermi Surface Topology, and Spin-Correlated Dielectric Response in Monolayer 1T-CrTe2. (arXiv:2310.19735v1 [cond-mat.mtrl-sci])**

Ahmed Elrashidy, Jia-An Yan

**Nanoscale electronic inhomogeneities in 1T-TaS$_2$. (arXiv:2310.19751v1 [cond-mat.mes-hall])**

B. Campbell, J.V. Riffle, A. de la Torre, Q. Wang, K.W. Plumb, S.M. Hollen

**Visualizing structure of correlated ground states using collective charge modes. (arXiv:2310.19771v1 [cond-mat.mes-hall])**

Michał Papaj, Guangxin Ni, Cyprian Lewandowski

**Charge-transfer Contact to a High-Mobility Monolayer Semiconductor. (arXiv:2310.19782v1 [cond-mat.mes-hall])**

Jordan Pack, Yinjie Guo, Ziyu Liu, Bjarke S. Jessen, Luke Holtzman, Song Liu, Matthew Cothrine, Kenji Watanabe, Takashi Taniguchi, David G. Mandrus, Katayun Barmak, James Hone, Cory R. Dean

**Nematic excitonic insulator in transition metal dichalcogenide moir\'e heterobilayers. (arXiv:2206.12427v2 [cond-mat.str-el] UPDATED)**

Ming Xie, Haining Pan, Fengcheng Wu, Sankar Das Sarma

**Charge-loop current order and Z3 nematicity mediated by bond-order fluctuations in kagome metal AV3Sb5 (A=Cs,Rb,K). (arXiv:2207.08068v2 [cond-mat.str-el] UPDATED)**

Rina Tazai, Youichi Yamakawa, Hiroshi Kontani

**Braid Protected Topological Band Structures with Unpaired Exceptional Points. (arXiv:2211.05788v2 [cond-mat.mes-hall] UPDATED)**

J. Lukas K. König, Kang Yang, Jan Carl Budich, Emil J. Bergholtz

**Influence of cumulative damage on synchronization of Kuramoto oscillators on networks. (arXiv:2212.08576v2 [cond-mat.stat-mech] UPDATED)**

Leidy Katherin Eraso Hernández, Alejandro P. Riascos

**Interplay between Topological States and Rashba States as Manifested on Surface Steps at Room Temperature. (arXiv:2301.06266v2 [cond-mat.mes-hall] UPDATED)**

Wonhee Ko, Seoung-Hun Kang, Jason Lapano, Hao Chang, Jacob Teeter, Hoyeon Jeon, Matthew Brahlek, Mina Yoon, Robert G. Moore, An-Ping Li

**Entanglement entropy of higher rank topological phases. (arXiv:2302.11468v2 [cond-mat.str-el] UPDATED)**

Hiromi Ebisu

**Categorical Symmetry of the Standard Model from Gravitational Anomaly. (arXiv:2302.14862v2 [hep-th] UPDATED)**

Pavel Putrov, Juven Wang

**Dipole symmetries from the topology of the phase space and the constraints on the low-energy spectrum. (arXiv:2303.04479v2 [hep-th] UPDATED)**

Tomas Brauner, Naoki Yamamoto, Ryo Yokokura

**Transport of bound quasiparticle states in a two-dimensional boundary superfluid. (arXiv:2303.16518v2 [cond-mat.other] UPDATED)**

S. Autti, R. P. Haley, A. Jennings, G. R. Pickett, M. Poole, R. Schanen, A. A. Soldatov, V. Tsepelin, J. Vonka, V. V. Zavjalov, D. E. Zmeev

**Domain Agnostic Fourier Neural Operators. (arXiv:2305.00478v2 [cs.LG] UPDATED)**

Ning Liu, Siavash Jafarzadeh, Yue Yu

**Even spheres as joint spectra of matrix models. (arXiv:2305.12026v2 [math.OA] UPDATED)**

Alexander Cerjan, Terry A. Loring

**Exciton-Sensitized Second-Harmonic Generation in 2D Heterostructures. (arXiv:2305.17512v2 [cond-mat.mtrl-sci] UPDATED)**

Wontaek Kim, Gyouil Jeong, Juseung Oh, Jihun Kim, Kenji Watanabe, Takashi Taniguchi, Sunmin Ryu

**Circular dichroism induction in WS2 by a chiral plasmonic metasurface. (arXiv:2306.03028v2 [physics.optics] UPDATED)**

Fernando Lorén, Cyriaque Genet, Luis Martín-Moreno

**Optical pumping of electronic quantum Hall states with vortex light. (arXiv:2306.03417v2 [cond-mat.mes-hall] UPDATED)**

Deric Session, Mahmoud Jalali Mehrabad, Nikil Paithankar, Tobias Grass, Christian J. Eckhardt, Bin Cao, Daniel Gustavo Suárez Forero, Kevin Li, Mohammad S. Alam, Kenji Watanabe, Takashi Taniguchi, Glenn S. Solomon, Nathan Schine, Jay Sau, Roman Sordan, Mohammad Hafezi

**Charge conservation in spin torque oscillators leads to a self-induced torque. (arXiv:2307.05105v2 [cond-mat.mes-hall] UPDATED)**

Pieter M. Gunnink, Tim Ludwig, Rembert A. Duine

**Minimal alternating current injection into carbon nanotubes. (arXiv:2307.11943v4 [cond-mat.mes-hall] UPDATED)**

Kota Fukuzawa, Takeo Kato, Thibaut Jonckheere, Jérôme Rech, Thierry Martin

**Two-dimensional electron hydrodynamics in a random array of impenetrable obstacles: Magnetoresistivity, Hall viscosity, and the Landauer dipole. (arXiv:2308.06876v2 [cond-mat.mes-hall] UPDATED)**

I. V. Gornyi, D. G. Polyakov

**Vortex detection in atomic Bose-Einstein condensates using neural networks trained on synthetic images. (arXiv:2308.08405v2 [cond-mat.quant-gas] UPDATED)**

Myeonghyeon Kim, Junhwan Kwon, Tenzin Rabga, Yong-il Shin

**Anomaly Enforced Gaplessness and Symmetry Fractionalization for $Spin_G$ Symmetries. (arXiv:2308.12999v2 [hep-th] UPDATED)**

T. Daniel Brennan

**Design monolayer iodinenes based on halogen bond and tiling theory. (arXiv:2309.06184v2 [cond-mat.mtrl-sci] UPDATED)**

Kejun Yu, Botao Fu, Runwu Zhang, Da-shuai Ma, Xiao-ping Li, Zhi-Ming Yu, Cheng-Cheng Liu, Yugui Yao

**Topological dualities via tensor networks. (arXiv:2309.13118v2 [cond-mat.str-el] UPDATED)**

C. Wille, J. Eisert, A. Altland

**Structural transformations driven by local disorder at interfaces. (arXiv:2310.11863v2 [cond-mat.mtrl-sci] UPDATED)**

Yanyan Liang, Grisell Díaz Leines, Ralf Drautz, Jutta Rogal

**Multi-moir\'{e} trilayer graphene: lattice relaxation, electronic structure, and magic angles. (arXiv:2310.12961v2 [cond-mat.str-el] UPDATED)**

Charles Yang, Julian May-Mann, Ziyan Zhu, Trithep Devakul

**Layer-by-Layer Assembled Nanowire Networks Enable Graph Theoretical Design of Multifunctional Coatings. (arXiv:2310.15369v2 [physics.app-ph] UPDATED)**

Wenbing Wu, Alain Kadar, Sang Hyun Lee, Bum Chul Park, Jeffery E. Raymond, Thomas K. Tsotsis, Carlos E. S. Cesnik, Sharon C. Glotzer, Valerie Goss, Nicholas A. Kotov

Found 8 papers in prb Two-dimensional materials with a negative Poisson ratio, which exhibit unique mechanical behavior that expands laterally when stretched, have attracted considerable attention for their practical applications in sensors, biomedicine, and other fields. Here, using the elastic solid theory and first-pr… Higher-order topological insulators (HOTIs) are a novel class of materials that exhibit exotic boundary states. The finite size effect induced hybridization between the boundary state HOTIs, however, remains largely unexplored. In this work, we analytically and numerically study the hybridization in… Vacancies are commonly introduced in the preparation of transition metal dichalcogenide (TMD) heterostructures, severely affecting photogenerated carrier dynamics. Herein, we systematically explore the carrier dynamics of TMD heterostructures (metal: Mo, W; chalcogen: S, Se, Te) with the most common… We formulate a general framework to study the flow of the electron liquid in two dimensions past a random array of impenetrable obstacles in the presence of a magnetic field. We derive a linear-response formula for the resistivity tensor $\stackrel{̂}{ρ}$ in hydrodynamics with obstacles, which expre… A ferroelectric distorted (d) 1 The multifunctional manipulation of magnetic topological textures such as skyrmions and bimerons in energy-efficient ways is of great importance for spintronic applications, but it is still a big challenge. Here, by first-principles calculations and atomistic simulations, the creation and annihilati… Semiconductor artificial graphene nanostructures where the Hubbard model parameter $U/t$ can be of the order of 100, provide a highly controllable platform to study strongly correlated quantum many-particle phases. We use accurate variational and diffusion Monte Carlo methods to demonstrate a transi… Quasiparticles with Weyl dispersion can display an abundance of novel topological, thermodynamic, and transport phenomena, which is why novel Weyl materials and platforms for Weyl physics are being intensively looked for in electronic, magnetic, photonic, and acoustic systems. We demonstrate that co…

Date of feed: Tue, 31 Oct 2023 04:16:51 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) **Strain-tunable topological antiferromagnetism of two-dimensional magnets with negative Poisson ratio**

Yingmei Zhu, Qirui Cui, Bo Liu, Tiejun Zhou, and Hongxin Yang

Author(s): Yingmei Zhu, Qirui Cui, Bo Liu, Tiejun Zhou, and Hongxin Yang

[Phys. Rev. B 108, 134438] Published Mon Oct 30, 2023

**Tuning three-dimensional higher-order topological insulators by surface state hybridization**

Hao-Jie Lin, Hai-Peng Sun, Tianyu Liu, and Peng-Lu Zhao

Author(s): Hao-Jie Lin, Hai-Peng Sun, Tianyu Liu, and Peng-Lu Zhao

[Phys. Rev. B 108, 165427] Published Mon Oct 30, 2023

**Work function dependent photogenerated carrier dynamics of defective transition metal dichalcogenide heterostructures**

Tingbo Zhang, Yehui Zhang, Xianghong Niu, Qian Chen, and Jinlan Wang

Author(s): Tingbo Zhang, Yehui Zhang, Xianghong Niu, Qian Chen, and Jinlan Wang

[Phys. Rev. B 108, 165428] Published Mon Oct 30, 2023

**Two-dimensional electron hydrodynamics in a random array of impenetrable obstacles: Magnetoresistivity, Hall viscosity, and the Landauer dipole**

I. V. Gornyi and D. G. Polyakov

Author(s): I. V. Gornyi and D. G. Polyakov

[Phys. Rev. B 108, 165429] Published Mon Oct 30, 2023

**Ferroelectric phase transition in a $1T$ monolayer of ${\mathrm{MoTe}}_{2}$: A first-principles study**

Li-Bin Wan, Bin Xu, Peng Chen, and Jin-Zhu Zhao

Author(s): Li-Bin Wan, Bin Xu, Peng Chen, and Jin-Zhu Zhao*T* (d1*T*)-phase characterized by out-of-plane (OOP) polarization was previously predicted in monolayer transition-metal dichalcogenides, such as ${\mathrm{MoS}}_{2}$. A phenomenological model was proposed to explain the centrosymmetric 1*T* (c1*T*)-to-d1*T* transition; however…

[Phys. Rev. B 108, 165430] Published Mon Oct 30, 2023

**Manipulation of magnetic topological textures via perpendicular strain and polarization in van der Waals magnetoelectric heterostructures**

Zhong Shen, Shuai Dong, and Xiaoyan Yao

Author(s): Zhong Shen, Shuai Dong, and Xiaoyan Yao

[Phys. Rev. B 108, L140412] Published Mon Oct 30, 2023

**Quantum Monte Carlo study of semiconductor artificial graphene nanostructures**

Gökhan Öztarhan, E. Bulut Kul, Emre Okcu, and A. D. Güçlü

Author(s): Gökhan Öztarhan, E. Bulut Kul, Emre Okcu, and A. D. Güçlü

[Phys. Rev. B 108, L161114] Published Mon Oct 30, 2023

**Weyl excitations via helicon-phonon mixing in conducting materials**

Dmitry K. Efimkin and Sergey Syzranov

Author(s): Dmitry K. Efimkin and Sergey Syzranov

[Phys. Rev. B 108, L161411] Published Mon Oct 30, 2023

Found 2 papers in prl The Fe intercalated transition metal dichalcogenide (TMD), ${\mathrm{Fe}}_{1/3}{\mathrm{NbS}}_{2}$, exhibits remarkable resistance switching properties and highly tunable spin ordering phases due to magnetic defects. We conduct synchrotron x-ray scattering measurements on both underintercalated ($x=… Transition metal dichalcogenide heterostructures have been extensively studied as a platform for investigating exciton physics. While heterobilayers such as ${\mathrm{WSe}}_{2}/{\mathrm{MoSe}}_{2}$ have received significant attention, there has been comparatively less research on heterotrilayers, wh…

Date of feed: Tue, 31 Oct 2023 04:16:49 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) **Discovery of Charge Order in the Transition Metal Dichalcogenide ${\mathrm{Fe}}_{x}{\mathrm{NbS}}_{2}$**

Shan Wu, Rourav Basak, Wenxin Li, Jong-Woo Kim, Philip J. Ryan, Donghui Lu, Makoto Hashimoto, Christie Nelson, Raul Acevedo-Esteves, Shannon C. Haley, James G. Analytis, Yu He, Alex Frano, and Robert J. Birgeneau

Author(s): Shan Wu, Rourav Basak, Wenxin Li, Jong-Woo Kim, Philip J. Ryan, Donghui Lu, Makoto Hashimoto, Christie Nelson, Raul Acevedo-Esteves, Shannon C. Haley, James G. Analytis, Yu He, Alex Frano, and Robert J. Birgeneau

[Phys. Rev. Lett. 131, 186701] Published Mon Oct 30, 2023

**Bright and Dark Quadrupolar Excitons in the ${\mathrm{WSe}}_{2}/{\mathrm{MoSe}}_{2}/{\mathrm{WSe}}_{2}$ Heterotrilayer**

Yongzhi Xie, Yuchen Gao, Fengyu Chen, Yunkun Wang, Jun Mao, Qinyun Liu, Saisai Chu, Hong Yang, Yu Ye, Qihuang Gong, Ji Feng, and Yunan Gao

Author(s): Yongzhi Xie, Yuchen Gao, Fengyu Chen, Yunkun Wang, Jun Mao, Qinyun Liu, Saisai Chu, Hong Yang, Yu Ye, Qihuang Gong, Ji Feng, and Yunan Gao

[Phys. Rev. Lett. 131, 186901] Published Mon Oct 30, 2023

Found 1 papers in prx A framework to quantify the computational capacity of arbitrary physical systems in the presence of sampling noise provides a tool for best harnessing them for machine learning.

Date of feed: Tue, 31 Oct 2023 04:16:49 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) **Tackling Sampling Noise in Physical Systems for Machine Learning Applications: Fundamental Limits and Eigentasks**

Fangjun Hu, Gerasimos Angelatos, Saeed A. Khan, Marti Vives, Esin Türeci, Leon Bello, Graham E. Rowlands, Guilhem J. Ribeill, and Hakan E. Türeci

Author(s): Fangjun Hu, Gerasimos Angelatos, Saeed A. Khan, Marti Vives, Esin Türeci, Leon Bello, Graham E. Rowlands, Guilhem J. Ribeill, and Hakan E. Türeci

[Phys. Rev. X 13, 041020] Published Mon Oct 30, 2023

Found 1 papers in pr_res Graph states are special entangled states advantageous for many quantum technologies, including quantum error correction, multiparty quantum communication, and measurement-based quantum computation. Yet, their fidelity is often disrupted by various errors, most notably qubit loss. In general, given …

Date of feed: Tue, 31 Oct 2023 04:16:51 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) **Robustness of Bell violation of graph states to qubit loss**

Shahar Silberstein and Rotem Arnon-Friedman

Author(s): Shahar Silberstein and Rotem Arnon-Friedman

[Phys. Rev. Research 5, 043099] Published Mon Oct 30, 2023

Found 1 papers in nat-comm **Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Localization and interaction of interlayer excitons in MoSe2/WSe2 heterobilayers**

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