Found 69 papers in cond-mat In spin-glasses (SG), the relaxation time $\tau$ ($= 1/2{\pi}f$) vs. $T_f$
data at the peak position $T_f$ in the temperature variation of the ac magnetic
susceptibilities at different frequencies f is often fit to the Vogel-Fulcher
Law (VFL): $\tau=\tau_0\exp[E_a/k_b(T_f-T_0)]$ and to the Power Law (PL): $\tau
= \tau_0^*[(T_f-T_{SG}/T_{SG}]^{-z\nu}$. Both these laws have three fitting
parameters each, leaving a degree of uncertainty since the magnitudes of the
evaluated parameters $\tau_0$, $E_a/k_B$, $\tau_{0^*}$ and $z\nu$ depend
strongly on the choice of $T_0$ and $T_{SG}$. Here we report an optimized
procedure for the analysis of $\tau$ vs. $T_f$ data on several SG systems for
which we could extract such data from published sources. In this optimized
method, the data of $\tau$ vs. $T_f$ are fit by varying $T_0$ in the linear
plots of $\ln \tau$ vs $1/ (T_f - T_0)$ for the VFL and by varying $T_{SG}$ in
the linear plot of $\ln \tau$ vs. $\ln (T_f - T_{SG})/ T_{SG}$ for the PL till
optimum fits are obtained. The analysis of the associated magnitudes of
$\tau_0$, $E_a/k_B$, $\tau_{0^*}$ and $z\nu$ for these optimum values of $T_0$
and $T_{SG}$ shows that magnitudes of $\tau_{0^*}$, $\tau_0$ and $z\nu$ fail to
provide a clear distinction between canonical and cluster SG. However, new
results emerge showing $E_a/(k_BT_0) < 1$ in canonical SG whereas $E_a/(k_BT_0)
>1$ for cluster SG systems and the optimized $T_0 <$ optimized $T_{SG}$ in all
cases. Although some interpretation of these new results is presented, a more
rigorous theoretical justification of the boundary near $E_a/(k_BT_0) \sim 1$
is desired along with testing of these criteria in other SG systems.
One-dimensional disordered systems with a random potential of a small
amplitude and short-range correlations are considered near the initial band
edge. The evolution equation is obtained for the mutual ditribution
P(\rho,\psi) of the Landauer resistance \rho and the phase variable
\psi=\theta-\varphi (\theta and \varphi are phases entering the transfer
matrix), when the system length L is increased. In the large L limit, the
equation allows separation of variables, which provides the existence of the
stationary distribution P(\psi), determinative the coefficients in the
evolution equation for P(\rho). The limiting distribution P(\rho) for
L\to\infty is log-normal and does not depend on boundary conditions. It is
determined by the 'internal' phase distribution, whose form is established in
the whole energy range including the forbidden band of the initial crystal. The
random phase approximation is valid in the deep of the allowed band, but
strongly violated for other energies. The phase \psi appears to be a 'bad'
variable, while the 'correct' vaiable is \omega=-ctg (psi/2). The form of the
stationary distribution P(\omega) is determined by the internal properties of
the system and is independent of boundary conditions. Variation of the boundary
conditions leads to the scale transformation \omega\to s\omega and translations
\omega \to \omega+\omega_0 and \psi\to\psi+\psi_0, which determinates the
'external' phase distribution, entering the evolution equations. Independence
of the limiting distribution P(\rho) on the external distribution P(\psi)
allows to say on the hidden symmetry, whose character is revealed below.
Despite a long history of studies of vortex crystals in rotating superfluids,
their melting due to quantum fluctuations is poorly understood. Here we develop
a fracton-elasticity duality to investigate a two-dimensional vortex lattice
within the fast rotation regime, where the Lifshitz model of the collective
Tkachenko mode serves as the leading-order low-energy effective theory. We
incorporate topological defects and discuss several quantum melting scenarios
triggered by their proliferation. Furthermore, we lay the groundwork for a dual
non-linear gravity description of the superfluid vortex crystals.
Motivated by a recent experiment [Kapfer et. al., Science 381, 677 (2023)],
we analyze the low-energy physics of a bent nanoribbon placed on top of
graphene, which creates a gradually changing moir\'e pattern. By means of a
classical elastic model we derive the strains in the ribbon and we obtain its
spectrum with a scaled tight-binding model. In a nanoribbon on a substrate
pushed at one edge, the interplay between elasticity and van der Waals forces
lead to a quasi-universal shape, with a well defined maximum twist angle,
irrespective of the force applied at the end. Near the clamped edge, strong
strains and small angles leads to one-dimensional channels. Near the bent edge,
a long region behaves like magic angle twisted bilayer graphene (TBG), showing
a sharp peak in the density of states, mostly isolated from the rest of the
spectrum. We also calculate the band topology along the ribbon and we find that
it is stable for large intervals of strains an twist angles. Together with the
experimental observations, these results show that the bent nanoribbon geometry
is ideal for exploring superconductivity and correlated phases in TBG in the
very sought-after regime of ultra-low twist angle disorder.
We study an effective field theory of a vortex lattice in a two-dimensional
neutral rotating superfluid. Utilizing particle-vortex dualities we explore its
formulation in terms of a $U(1)$ gauge theory coupled to elasticity, that at
low energies reduces to a Lifshitz theory augmented with a Berry phase term
encoding the vortex dynamics in the presence of a superflow. Utilizing
elasticity- and Lifshitz-gauge theory dualities, we derive dual formulations of
the vortex lattice in terms of a traceless symmetric scalar-charge theory and
demonstrate low-energy equivalence of our dual gauge theory to its
elasticity-gauge theory dual. We further discuss a multipole symmetry of the
vortex lattice and its dual gauge theory's multipole one-form symmetries. We
also study its topological crystalline defects, where the multipole one-form
symmetry plays a prominent role, organizing the defects, explaining their
restricted mobility, and characterizing descendant vortex phases.
Chalcogenide perovskites provide a promising avenue for non-toxic, stable
thermoelectric materials. Here, thermal transport and thermoelectric properties
of BaZrS$_3$ as a typical orthorhombic perovskite are investigated. An
extremely low lattice thermal conductivity $\kappa_L$ of 1.84 W/mK at 300 K is
revealed for BaZrS$_3$, due to the softening effect of Ba atoms on the lattice
and the strong anharmonicity caused by the twisted structure. We demonstrate
that coherence contributions to $\kappa_L$, arising from wave-like phonon
tunneling, leading to a 18 \% thermal transport contribution at 300 K. The
increasing temperature softens the phonons, thus reducing the group velocity of
materials and increasing the scattering phase space. However, it simultaneously
reduces the anharmonicity, which is dominant in BaZrS$_3$ and ultimately
improves the particle-like thermal transport. Further, by replacing S atom with
Se and Ti-alloying strategy, $ZT$ value of BaZrS$_3$ is significantly increased
from 0.58 to 0.91 at 500 K, making it an important candidate for thermoelectric
applications.
Quantised lattice vibrations (i.e., phonons) in solids are robust and
unambiguous fingerprints of crystal structures and of their symmetry
properties. In metals and semimetals, strong electron-phonon coupling may lead
to so-called Kohn anomalies in the phonon dispersion, providing an image of the
Fermi surface in a non-electronic observable. Kohn anomalies become prominent
in low-dimensional systems, in particular in graphene, where they appear as
sharp kinks in the in-plane optical phonon branches. However, in spite of
intense research efforts on electron-phonon coupling in graphene and related
van der Waals heterostructures, little is known regarding the links between the
symmetry properties of optical phonons at and near Kohn anomalies and their
sensitivity towards the local environment. Here, using inelastic light
scattering (Raman) spectroscopy, we investigate a set of custom-designed
graphene-based van der Waals heterostructures, wherein dielectric screening is
finely controlled at the atomic layer level. We demonstrate experimentally and
explain theoretically that, depending exclusively on their symmetry properties,
the two main Raman modes of graphene react differently to the surrounding
environment. While the Raman-active near-zone-edge optical phonons in graphene
undergo changes in their frequencies due to the neighboring dielectric
environment, the in-plane, zone-centre optical phonons are symmetry-protected
from the influence of the latter. These results shed new light on the unique
electron-phonon coupling properties in graphene and related systems and provide
invaluable guidelines to characterise dielectric screening in van der Waals
heterostructures and moir\'e superlattices.
Molecular beam epitaxy (MBE), a workhorse of the semiconductor industry, has
progressed rapidly in the last few decades in the development of novel
materials. Recent developments in condensed matter and materials physics have
seen the rise of many novel quantum materials that require ultra-clean and
high-quality samples for fundamental studies and applications. Novel
oxide-based quantum materials synthesized using MBE have advanced the
development of the field and materials. In this review, we discuss the recent
progress in new MBE techniques that have enabled synthesis of complex oxides
that exhibit "quantum" phenomena, including superconductivity and topological
electronic states. We show how these techniques have produced breakthroughs in
the synthesis of 4d and 5d oxide films and heterostructures that are of
particular interest as quantum materials. These new techniques in MBE offer a
bright future for the synthesis of ultra-high quality oxide quantum materials.
Recent experiments performed the nonreciprocal magneotransport in ZrTe$_5$
and obtained a giant magnetochiral anisotropy (MCA) coefficient $\gamma'$. The
existing theoretical analysis was based on the semiclassical Boltzmann
equation. In this paper, we develop a full quantum theory to calculate
$\gamma'$. We reveal that the $xz$-mirror symmetry breaking term also breaks
the parity symmetry of the system, and leads to the mixed selection rules and a
nonvanishing second-order conductivity $\sigma_{xxx}$. The calculations show
that $\gamma'$ decreases with the magnetic field, survives only to weak
impurity scatterings, and grows almost linearly with the strength of the
$xz$-mirror symmetry breaking. Our paper can provide a deeper insight into the
intrinsic nonreciprocal magnetotransport phenomena in the topological semimetal
material.
Monolayer transition metal dichalcogenides (TMDCs) constitute the core group
of materials in the emerging semiconductor technology of valleytronics. While
the coupled spin-valley physics of pristine TMDC materials and their
heterstructures has been extensively investigated, less attention was given to
TMDC alloys, which could be useful in optoelectronic applications due to the
tunability of their band gaps. We report here our experimental investigations
of the spin-valley physics of the monolayer and bilayer TMDC alloy,
MoS$_{2x}$Se$_{2(1-x)}$, in terms of valley polarization and the generation as
well as electrical control of a photocurrent utilising the circular
photogalvanic effect. Piezoelectric force microscopy provides evidence for an
internal electric field perpendicular to the alloy layer, thus breaking the
out-of-plane mirror symmetry. This feature allows for the generation of a
photocurrent in the alloy bilayer even in the absence of an external electric
field. A comparison of the photocurrent device, based on the alloy material, is
made with similar devices involving other TMDC materials.
We report on scanning tunneling microscopy (STM) topographs of individual
metal phthalocyanines (MPc) on a thin salt (NaCl) film on a gold substrate, at
tunneling energies within the molecule's electronic transport gap. Theoretical
models of increasing complexity are discussed. The calculations for MPcs
adsorbed on a thin NaCl layer on Au(111) demonstrate that the STM pattern
rotates with the molecule's orientations - in excellent agreement with the
experimental data. Thus, even the STM topography obtained for energies in the
transport gap represent the structure of a one atom thick molecule. It is shown
that the electronic states inside the transport gap can be rather accurately
approximated by linear combinations of bound molecular orbitals (MOs). The gap
states include not only the frontier orbitals but also surprisingly large
contributions from energetically much lower MOs. These results will be
essential for understanding processes, such as exciton creation, which can be
induced by electrons tunneling through the transport gap of a molecule.
TlTaSe2 is a non-centrosymmetric quasi-2D crystal semi-metal hosting
nodal-line topological features protected by mirror-reflection symmetry. Here,
we investigated the superconducting properties of TlTaSe2 using the
first-principles anisotropic Migdal-Eliashberg theory. The Fermi surface hosts
well gapped multiband features contributed by the Ta 5d and Tl 6p orbitals.
Moreso, anisotropic superconducting gaps were found to exist at 2.15 and 4.5
meV around the in-plane orbitals, coupling effectively with the in-plane
phonons of the Ta and Tl atoms. Using the Allen-Dynes-modified McMillan
formula, we found a superconducting transition temperature of 6.67 K,
accompanied by a robust electron-phonon coupling constant {\lambda} of 0.970.
This investigation provides valuable insights into the mechanisms underlying
anisotropic superconductivity in TlTaSe2.
Magnetic skyrmions offer promising prospects for constructing future
energy-efficient and high-density information technology, leading to extensive
explorations of new skyrmionic materials recently. The topological Hall effect
has been widely adopted as a distinctive marker of skyrmion emergence.
Alternately, here we propose a novel signature of skyrmion state by
quantitatively investigating the magnetoresistance (MR) induced by skyrmionic
bubbles in CeMn2Ge2. An intriguing finding was revealed: the anomalous MR
measured at different temperatures can be normalized into a single curve,
regardless of sample thickness. This behavior can be accurately reproduced by
the recent chiral spin textures MR model. Further analysis of the MR anomaly
allowed us to quantitatively examine the effective magnetic fields of various
scattering channels. Remarkably, the analyses, combined with the Lorentz
transmission electronic microscopy results, indicate that the in-plane
scattering channel with triplet exchange interactions predominantly governs the
magnetotransport in the Bloch-type skyrmionic bubble state. Our results not
only provide insights into the quantum correction on MR induced by skyrmionic
bubble phase, but also present an electrical probing method for studying chiral
spin texture formation, evolution and their topological properties, which opens
up exciting possibilities for identifying new skyrmionic materials and
advancing the methodology for studying chiral spin textures.
One of the problems concerning topological phases in solid-state systems
which still remains urgent is an issue of many-body effects. In this study we
address it within perturbative theory framework by considering topological
phase transitions related to charge correlations in the extended Kitaev chain
model that belongs to the BDI symmetry class. Obtained corrections to a
zero-frequency quasiparticle Green's function allow to separate the mean-field
and fluctuation contributions to a total winding number. As a result, the phase
transitions caused solely by the latter are unveiled. We thoroughly analyze the
mechanism of such transitions in terms of fluctuation-induced nodal points and
spectrum renormalization. Additionally, features of other quasiparticle
properties such as effective mass and damping are discussed in the context of
topological phase transitions.
The alkali halides are ionic compounds. Each alkali atom donates an electron
to a halogen atom, leading to ions with full shells. The valence band is mainly
located on halogen atoms, while, in a traditional picture, the conduction band
is mainly located on alkali atoms. Scanning tunnelling microscopy of NaCl at 4
K actually shows that the conduction band is located on Cl$^-$ because the
strong Madelung potential reverses the order of the Na$^+$ 3s and Cl$^-$ 4s
levels. We verify this reversal is true for both atomically thin and bulk NaCl,
and discuss implications for II-VI and I-VII compounds.
The obstruction to constructing localized degrees of freedom is a signature
of several interesting condensed matter phases. We introduce a localization
renormalization procedure that harnesses this property, and apply our method to
distinguish between topological and trivial phases in quantum Hall and Chern
insulators. By iteratively removing a fraction of maximally-localized
orthogonal basis states, we find that the localization length in the residual
Hilbert space exhibits a power-law divergence as the fraction of remaining
states approaches zero, with an exponent of $\nu=0.5$. In sharp contrast, the
localization length converges to a system-size-independent constant in the
trivial phase. We verify this scaling using a variety of algorithms to truncate
the Hilbert space, and show that it corresponds to a statistically self-similar
expansion of the real-space projector. This result accords with a
renormalization group picture and motivates the use of localization
renormalization as a versatile numerical diagnostic for quantum Hall
insulators.
The existence of bound states induced by local impurities coupled to an
insulating host depends decisively on the global topological properties of the
host's electronic structure. In this context, we consider magnetic impurities
modelled as classical unit-length spins that are exchange-coupled to the
spinful Haldane model on the honeycomb lattice. We investigate the spectral
flow of bound states with the coupling strength $J$ in both the topologically
trivial and Chern-insulating phases. In addition to conventional $k$-space
topology, an additional, spatially local topological feature is available,
based on the space of impurity-spin configurations forming, in case of $R$
impurities, an $R$-fold direct product of two-dimensional spheres. Global
$k$-space and local $S$-space topology are represented by different topological
invariants, the first ($k$-space) Chern number and the $R$-th ($S$-space)
spin-Chern number. We demonstrate that there is a local $S$-space topological
transition as a function of $J$ associated with a change in the spin Chern
number and work out the implications of this for the $J$-dependent local
electronic structure close to the impurities and, in particular, for in-gap
bound states. The critical exchange couplings' dependence on the parameters of
the Haldane model, and thus on the $k$-space topological state, is obtained
numerically to construct local topological phase diagrams for systems with
$R=1$ and $R=2$ impurity spins.
In this paper we investigate the interplay of the Rashba spin-orbit coupling
(RSOC) and a topological defect, such as a screw dislocation in an {\alpha}-T3
Aharonov-Bohm quantum ring and scrutinized the effect of an external transverse
magnetic field therein. Our study reveals that the energy spectrum follows a
parabolic dependence on the Burgers vector associated with the screw
dislocation. Moreover, its presence results in an effective flux, encompassing
the ramifications due to both the topological flux and that due to the external
magnetic field. Furthermore, we observe periodic oscillations in the persistent
current in both charge and spin sectors, with a period equal to one flux
quantum, which, however suffers a phase shift that is proportional to the
dislocation present in the system. Such tunable oscillations of the spin
persistent current highlights potential application of our system to be used as
spintronic devices. Additionally, we derive and analyse the thermodynamic
properties of the ring via obtaining the canonical partition function through
Euler-Maclaurin formula. In particular, we compute the thermodynamic
potentials, free energies, entropy, and heat capacity and found the latter to
yield the expected Dulong-Petit law at large temperatures.
Bi$_2$Se$_3$ is one of the most promising topological insulators, but it
suffers from intrinsic n-doping due to Se-vacancies, which shifts the Fermi
level into the bulk conduction band, leading to topologically trivial carriers.
Recently it was shown that this Fermi-level shift can be compensated by a
locally controlled surface p-doping process, through water adsorption and XUV
irradiation. Here, the microscopic mechanism of this surface doping is studied
by means of density functional theory (DFT) focusing on the adsorption of
H$_2$O, OH, O, C and CH on Bi$_2$Se$_3$. We find that water adsorption has a
negligible doping effect while hydroxyl groups lead to n-doping. Carbon
adsorption on Se vacancies gives rise to p-doping but it also strongly modifies
the electronic band structure around the Dirac point. Only if the Se vacancies
are filled with atomic oxygen, the experimentally observed p-doping without
change of the topological surface bands is reproduced. Based on the DFT
results, we propose a reaction path where photon absorption gives rise to water
splitting and the produced O atoms fill the Se vacancies. Adsorbed OH groups
appear as intermediate states and carbon impurities may have a catalytic effect
in agreement with experimental observations.
We study multi-charged moments and symmetry-resolved R\'enyi entropy of free
compact boson for multiple disjoint intervals. The R\'enyi entropy evaluation
involves computing the partition function of the theory on Riemann surfaces
with genus g>1. This makes R\'enyi entropy sensitive to the local conformal
algebra of the theory. The free compact boson possesses a global U(1) symmetry
with respect to which we resolve R\'enyi entropy. The multi-charged moments are
obtained by studying the correlation function of flux-generating vertex
operators on the associated Riemann surface. Symmetry-resolved R\'enyi entropy
is then obtained from the Fourier transforms of the charged moments. R\'enyi
entropy is shown to have the familiar equipartition into local charge sectors
up to the leading order. The multi-charged moments are also essential in
studying the symmetry resolution of mutual information. The multi-charged
moments of the self-dual compact boson and massless Dirac fermion are also
shown to match for the cases when the associated reduced density matrix moments
are known to be the same. Finally, we numerically check our results against the
tight-binding model.
NiTe2, a type-II Dirac semimetal with strongly tilted Dirac band, has been
explored extensively to understand its intriguing topological properties. Here,
using density-functional theory (DFT) calculations, we report that the strength
of spin-orbit coupling (SOC) in NiTe2 can be tuned by Se substitution. This
results in negative shifts of the bulk Dirac point (BDP) while preserving the
type-II Dirac band. Indeed, combined studies using scanning tunneling
spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES)
confirm that the BDP in the NiTe2-xSex alloy moves from +0.1 eV (NiTe2) to -0.3
eV (NiTeSe) depending on the Se concentrations, indicating the effective
tunability of type-II Dirac fermions. Our results demonstrate an approach to
tailor the type-II Dirac band in NiTe2 by controlling the SOC strength via
chalcogen substitution. This approach can be applicable to different types of
topological materials.
In this paper, we derive a real-space topological invariant that involves all
energy states in the system. This global invariant, denoted by $Q$, is always
quantized to be 0 or 1, independent of symmetries. In terms of $Q$, we
numerically investigate topological properties of the nonchiral Rice-Mele model
including random onsite potentials to show that nontrivial bulk topology is
sustained for weak enough disorder. In this regime, a finite spectral gap
persists, and then $Q$ is definitely identified. We also consider sublattice
polarization of disorder potentials. In this case, the energy spectrum retains
a gap regardless of disorder strength so that $Q$ is unaffected by disorder.
This implies that bulk topology remains intact as long as the spectral gap
opens.
In situ reflective high-energy electron diffraction (RHEED) is widely used to
monitor the surface crystalline state during thin-film growth by molecular beam
epitaxy (MBE) and pulsed laser deposition. With the recent development of
machine learning (ML), ML-assisted analysis of RHEED videos aids in
interpreting the complete RHEED data of oxide thin films. The quantitative
analysis of RHEED data allows us to characterize and categorize the growth
modes step by step, and extract hidden knowledge of the epitaxial film growth
process. In this study, we employed the ML-assisted RHEED analysis method to
investigate the growth of 2D thin films of transition metal dichalcogenides
(ReSe2) on graphene substrates by MBE. Principal component analysis (PCA) and
K-means clustering were used to separate statistically important patterns and
visualize the trend of pattern evolution without any notable loss of
information. Using the modified PCA, we could monitor the diffraction intensity
of solely the ReSe2 layers by filtering out the substrate contribution. These
findings demonstrate that ML analysis can be successfully employed to examine
and understand the film-growth dynamics of 2D materials. Further, the ML-based
method can pave the way for the development of advanced real-time monitoring
and autonomous material synthesis techniques.
Vanadium diselenide (VSe2) has intriguing physical properties such as
unexpected ferromagnetism at the two-dimensional limit. However, the
experimental results for room temperature ferromagnetism are still
controversial and depend on the detailed crystal structure and stoichiometry.
Here we introduce crystal truncation rod (CTR) analysis to investigate the
atomic arrangement of bilayer VSe2 and bilayer graphene (BLG) hetero-structures
grown on a 6H-SiC(0001) substrate. Using non-destructive CTR analysis, we were
able to obtain electron density profiles and detailed crystal structure of the
VSe2/BLG heterostructures. Specifically, the out-of-plane lattice parameters of
each VSe2 layer were modulated by the interface compared to that of the bulk
VSe2 1T phase. The atomic arrangement of the VSe2/BLG heterostructure provides
deeper understanding and insight for elucidating the magnetic properties of the
van der Waals heterostructure.
The morphing of 3D structures is suitable for i) future tunable material
design for customizing material properties and ii) advanced manufacturing tools
for fabricating 3D structures on a 2D plane. However, there is no inverse
design method for topologically variable and volumetric morphing or morphing
with shape locking, which limits practical engineering applications. In this
study, we construct a general inverse design method for 3D architected
materials for topologically variable and volumetric morphing, whose shapes are
lockable in the morphed states, which can contribute to future tunable
materials, design, and advanced manufacturing. Volumetric mapping of bistable
unit cells onto any 3D morphing target geometry with kinematic and kinetic
modifications can produce flat-foldable and volumetric morphing structures with
shape-locking. This study presents a generalized inverse design method for 3D
metamaterial morphing that can be used for structural applications with shape
locking. Topologically variable morphing enables the manufacture of volumetric
structures on a 2D plane, saving tremendous energy and materials compared with
conventional 3D printing. Volumetric morphing can significantly expand the
design space with tunable physical properties without limiting the selection of
base materials.
The interplay between ferromagnetism and the non-trivial topology has
unveiled intriguing phases in the transport of charges and spins. For example,
it is consistently observed the so-called topological Hall effect (THE)
featuring a hump structure in the curve of the Hall resistance (Rxy) vs. a
magnetic field (H) of a heterostructure consisting of a ferromagnet (FM) and a
topological insulator (TI). The origin of the hump structure is still
controversial between the topological Hall effect model and the multi-component
anomalous Hall effect (AHE) model. In this work, we have investigated a
heterostructure consisting of BixSb2-xTeySe3-y (BSTS) and Cr2Te3 (CT), which
are well-known TI and two-dimensional FM, respectively. By using the so-called
minor-loop measurement, we have found that the hump structure observed in the
CT/BSTS is more likely to originate from two AHE channels. Moreover, by
analyzing the scaling behavior of each amplitude of two AHE with the
longitudinal resistivities of CT and BSTS, we have found that one AHE is
attributed to the extrinsic contribution of CT while the other is due to the
intrinsic contribution of BSTS. It implies that the proximity-induced
ferromagnetic layer inside BSTS serves as a source of the intrinsic AHE,
resulting in the hump structure explained by the two AHE model.
Topological superconductors have drawn significant interest from the
scientific community due to the accompanying Majorana fermions. Here, we report
the discovery of electronic structure and superconductivity in high-entropy
ceramics Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx (x = 1 and 0.8) combined with experiments
and first-principles calculations. The Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx high-entropy
ceramics show bulk type-II superconductivity with Tc about 4.00 K (x = 1) and
2.65 K (x = 0.8), respectively. The specific heat jump is equal to 1.45 (x = 1)
and 1.52 (x = 0.8), close to the expected value of 1.43 for the BCS
superconductor in the weak coupling limit. The high-pressure resistance
measurements show that a robust superconductivity against high physical
pressure in Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2C, with a slight Tc variation of 0.3 K
within 82.5 GPa. Furthermore, the first-principles calculations indicate that
the Dirac-like point exists in the electronic band structures of
Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2C, which is potentially a topological superconductor.
The Dirac-like point is mainly contributed by the d orbitals of transition
metals M and the p orbitals of C. The high-entropy ceramics provide an
excellent platform for the fabrication of novel quantum devices, and our study
may spark significant future physics investigations in this intriguing
material.
The confrontation between percolation processes and superconducting
fluctuations to account for the observed enhanced in-plane electrical
conductivity above but near $T_c$ in cuprates is revisited. The cuprates
studied here, La$_{1.85}$Sr$_{0.15}$CuO$_4$,
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$, and Tl$_2$Ba$_2$Ca$_2$Cu$_3$O$_{10}$, have
a different number of superconducting CuO$_2$ layers per unit-cell length and
different Josephson coupling between them, and are optimally-doped to minimize
$T_c$-inhomogeneities. The excellent chemical and structural quality of these
samples also contribute to minimize the effect of extrinsic
$T_c$-inhomogeneities, a crucial aspect when analyzing the possible presence of
intrinsic percolative processes. Our analyses also cover the so-called high
reduced-temperature region, up to the resistivity rounding onset
$\varepsilon_{onset}$. By using the simplest form of the effective-medium
theory, we show that possible emergent percolation processes alone cannot
account for the measured enhanced conductivity. In contrast, these measurements
can be quantitatively explained using the Gaussian-Ginzburg-Landau (GGL)
approach for the effect of superconducting fluctuations in layered
superconductors, extended to $\varepsilon_{onset}$ by including a total energy
cutoff, which takes into account the limits imposed by the Heisenberg
uncertainty principle to the shrinkage of the superconducting wavefunction. Our
analysis confirms the adequacy of this cutoff, and that the effective
periodicity length is controlled by the relative Josephson coupling between
superconducting layers. These conclusions are reinforced by analyzing one of
the recent works that allegedly discards the superconducting fluctuations
scenario while supporting a percolative scenario for the enhanced conductivity
above $T_c$ in cuprates.
Lightwave-driven terahertz scanning tunnelling microscopy (THz-STM) is
capable of exploring ultrafast dynamics across a wide range of materials with
angstrom resolution. In contrast to scanning near-field optical microscopy,
where photons scattered by the tip apex are analyzed to access the local
dielectric function on the nanoscale, THz-STM uses a strong-field single-cycle
terahertz pulse to drive an ultrafast current across a tunnel junction, thereby
probing the local density of electronic states. Yet, the terahertz field in a
THz-STM junction may also be spectrally modified by the electromagnetic
response of the sample. Here, we demonstrate a reliable and self-consistent
approach for terahertz near-field waveform acquisition in an atomic tunnel
junction that can be generally applied to electrically conductive surfaces. By
combining waveform sampling and tailoring with terahertz scanning tunnelling
spectroscopy (THz-STS), we comprehensively characterize the tunnel junction and
distinguish local sample properties from effects due to terahertz pulse
coupling and field enhancement. Through modelling, we verify the presence of an
isolated unipolar terahertz-induced current pulse, facilitating straightforward
interpretation for differential THz-STS with high spectral resolution. Finally,
we demonstrate the feasibility of atomic-scale terahertz time-domain
spectroscopy via the extremely localized near-fields in the tunnel junction.
Species' interactions are shaped by their traits. Thus, we expect traits --
in particular, trait (dis)similarity -- to play a central role in determining
whether a particular set of species coexists. Traits are, in turn, the outcome
of an eco-evolutionary process summarized by a phylogenetic tree. Therefore,
the phylogenetic tree associated with a set of species should carry information
about the dynamics and assembly properties of the community. Many studies have
highlighted the potentially complex ways in which this phylogenetic information
is translated into species' ecological properties. However, much less emphasis
has been placed on developing clear, quantitative expectations for community
properties under a particular hypothesis.
To address this gap, we couple a simple model of trait evolution on a
phylogenetic tree with Lotka-Volterra community dynamics. This allows us to
derive properties of a community of coexisting species as a function of the
number of traits, tree topology and the size of the species pool. Our analysis
highlights how phylogenies, through traits, affect the coexistence of a set of
species.
Together, these results provide much-needed baseline expectations for the
ways in which evolutionary history, summarized by phylogeny, is reflected in
the size and structure of ecological communities.
We establish low-temperature resonant inelastic light scattering (RILS)
spectroscopy as a tool to probe the formation of a series of moir\'e-bands in
twisted WSe2 bilayers by accessing collective inter-moir\'e-band excitations
(IMBE). We observe resonances in such RILS spectra at energies in agreement
with inter-moir\'e band (IMB) transitions obtained from an ab-initio based
continuum model. Transitions between the first and second IMB for a twist angle
of about 8{\deg} are reported and between first and second, third and higher
bands for a twist of about 3{\deg}. The signatures from IMBE for the latter
highlight a strong departure from parabolic bands with flat minibands
exhibiting very high density of states in accord with theory. These
observations allow to quantify the transition energies at the K-point where the
states relevant for correlation physics are hosted.
Materials able to rapidly switch between thermally conductive states by
external stimuli such as electric or magnetic fields can be used as
all-solid-state thermal switches and open a myriad of applications in heat
management, power generation and cooling. Here, we show that the large
magnetoresistance that occurs in the highly conducting semimetal
$\alpha$-WSi$_{2}$ single crystals leads to dramatically large changes in
thermal conductivity at temperatures <100 K. At temperatures <20 K, where
electron-phonon scattering is minimized, the thermal conductivity switching
ratio between zero field and a 9T applied field can be >7. We extract the
electronic and lattice components of the from the thermal conductivity
measurements and show that the Lorenz number for this material approximates the
theoretical value of L$_{0}$. From the heat capacity and thermal diffusivity,
the speed of thermal conductivity switching is estimated to range from 1 x
10$^{-4}$ seconds at 5 K to 0.2 seconds at 100 K for a 5-mm long sample. This
work shows that WSi$_{2}$, a highly conducting multi-carrier semimetal, is a
promising thermal switch component for low-temperature applications such
cyclical adiabatic demagnetization cooling, a technique that would enable
replacing $^{3}$He-based refrigerators.
We unveil that the holey graphyne (HGY), a two-dimensional carbon allotrope
where benzene rings are connected by two $-$C$\equiv$C$-$ bonds fabricated
recently in a bottom-up way, exhibits topological electronic states. Using
first-principles calculations and Wannier tight-binding modeling, we discover a
higher-order topological invariant associated with $C_2$ symmetry of the
material, and show that the resultant corner modes appear in nanoflakes
matching to the structure of precursor reported previously, which are ready for
direct experimental observations. In addition, we find that a band inversion
between emergent $g$-like and $h$-like orbitals gives rise to a nontrivial
topology characterized by $\mathbb{Z}_2$ invariant protected by an energy gap
as large as 0.52 eV, manifesting helical edge states mimicking those in the
prominent quantum spin Hall effect, which can be accessed experimentally after
hydrogenation in HGY. We hope these findings trigger interests towards
exploring the topological electronic states in HGY and related future
electronics applications.
In this work, we demonstrate the suitability of Reconfigurable Ferroelectric
Field-Effect- Transistors (Re-FeFET) for designing non-volatile reconfigurable
logic-in-memory circuits with multifunctional capabilities. Modulation of the
energy landscape within a homojunction of a 2D tungsten diselenide (WSe$_2$)
layer is achieved by independently controlling two split-gate electrodes made
of a ferroelectric 2D copper indium thiophosphate (CuInP$_2$S$_6$) layer.
Controlling the state encoded in the Program Gate enables switching between p,
n and ambipolar FeFET operating modes. The transistors exhibit on-off ratios
exceeding 10$^6$ and hysteresis windows of up to 10 V width. The homojunction
can change from ohmic-like to diode behavior, with a large rectification ratio
of 10$^4$. When programmed in the diode mode, the large built-in p-n junction
electric field enables efficient separation of photogenerated carriers, making
the device attractive for energy harvesting applications. The implementation of
the Re-FeFET for reconfigurable logic functions shows how a circuit can be
reconfigured to emulate either polymorphic ferroelectric NAND/AND
logic-in-memory or electronic XNOR logic with long retention time exceeding
10$^4$ seconds. We also illustrate how a circuit design made of just two
Re-FeFETs exhibits high logic expressivity with reconfigurability at runtime to
implement several key non-volatile 2-input logic functions. Moreover, the
Re-FeFET circuit demonstrates remarkable compactness, with an up to 80%
reduction in transistor count compared to standard CMOS design. The 2D van de
Waals Re-FeFET devices therefore exhibit groundbreaking potential for both
More-than-Moore and beyond-Moore future of electronics, in particular for an
energy-efficient implementation of in-memory computing and machine learning
hardware, due to their multifunctionality and design compactness.
Small-angle scattering is a commonly used tool to analyze the dispersion of
nanoparticles in all kinds of matrices. Besides some obvious cases, the
associated structure factor is often complex and cannot be reduced to a simple
interparticle interaction, like excluded volume only. In recent experiments, we
have encountered a surprising absence of structure factors (S(q) = 1) in
scattering from rather concentrated polymer nanocomposites [A.-C. Genix et al,
ACS Appl. Mater. Interfaces 11 (2019) 17863]. In this case, quite pure form
factor scattering is observed. This somewhat ``ideal'' structure is further
investigated here making use of reverse Monte Carlo simulations in order to
shed light on the corresponding nanoparticle structure in space. By fixing the
target ``experimental'' apparent structure factor to one over a given q-range
in these simulations, we show that it is possible to find dispersions with this
property. The influence of nanoparticle volume fraction and polydispersity has
been investigated, and it was found that for high concentrations only a high
polydispersity allows reaching a state of S = 1. The underlying structure in
real space is discussed in terms of the pair-correlation function, which
evidences the importance of attractive interactions between polydisperse
nanoparticles. The calculation of partial structure factors shows that there is
no specific ordering of large or small particles, but that the presence of
attractive interactions together with polydispersity allows reaching an almost
``structureless'' state.
Noncentrosymmetric superconductors can support flat bands of zero-energy
surface states in part of their surface Brillouin zone. This requires that they
obey time-reversal symmetry and have a sufficiently strong
triplet-to-singlet-pairing ratio to exhibit nodal lines in the bulk. These
bands are protected by a winding number that relies on chiral symmetry, which
is realized as the product of time-reversal and particle-hole symmetry. We
reveal a way to stabilize a flat band in the entire surface Brillouin zone,
while the bulk dispersion is fully gapped. This idea could lead to a robust
platform for quantum computation and represents an alternative route to
strongly correlated flat bands in two dimensions, besides twisted bilayer
graphene. The necessary ingredient is an additional spin-rotation symmetry that
forces the direction of the spin-orbit-coupling vector not to depend on the
momentum component normal to the surface. We define a winding number which
leads to flat zero-energy surface bands due to bulk-boundary correspondence. We
discuss under which conditions this winding number is nonzero in the entire
surface Brillouin zone and verify the occurrence of zero-energy surface states
by exact numerical diagonalization of the Bogoliubov-de Gennes Hamiltonian for
a slab. In addition, we consider how a weak breaking of the additional symmetry
affects the surface band, employing first-order perturbation theory and a
quasiclassical approximation. We find that the surface states and the bulk gap
persist for weak breaking of the additional symmetry but that the band does not
remain perfectly flat. The broadening of the band strongly depends on the
deviation of the spin-orbit-coupling vector from its unperturbed direction as
well as on the spin-orbit-coupling strength and the triplet-pairing amplitude.
Covalent Organic Frameworks (COFs) have gained significant popularity in
recent years due to their unique ability to provide a high surface area and
customizable pore geometry and chemistry. These traits make COFs a highly
promising choice for a range of applications. However, with their vast
potential structures, exploring COFs experimentally can be challenging and
time-consuming, yet it remains an attractive avenue for computational
high-throughput studies. However, generating COF structures can be a
time-consuming and challenging task. To address this challenge, here we
introduce the pyCOFBuilder, an open-source Python package designed to
facilitate the generation of COF structures for computational studies. The
pyCOFBuilder software provides an easy-to-use set of functionalities to
generate COF structures following the reticular approach. In this paper, we
describe the implementation, main features, and capabilities of the
pyCOFBuilder demonstrating its utility for generating COF structures with
varying topologies and chemical properties. pyCOFBuilder is freely available on
GitHub at https://github.com/lipelopesoliveira/pyCOFBuilder.
Topology is a fundamental aspect of quantum physics, and it has led to key
breakthroughs and results in various fields of quantum materials. In condensed
matters, this has culminated in the recent discovery of symmetry-protected
topological phases. However, symmetry-based topological characterizations rely
heavily on symmetry analysis and are incapable of detecting the topological
phases in systems where the symmetry is broken, thus missing a large portion of
interesting topological physics. Here, we propose a new approach to
understanding the topological nature of quantum materials, which we call
feature spectrum topology. In this framework, the ground-state is separated
into different partitions by the eigenspectrum of a feature, a particular
chosen internal quantum degree of freedom, such as spin or pseudo-spin, and the
topological properties are determined by analysis of these ground-state
partitions. We show that bulk-boundary correspondence guarantees gapless
spectral flows in either one of the energy or feature spectrum. Most
importantly, such 'feature-energy duality' of gapless spectral flows serves as
a fundamental manifestation of a topological phase, thereby paving a new way
towards topological characterizations beyond symmetry considerations. Our
development reveals the topological nature of a quantum ground state hidden
outside symmetry-based characterizations, hence, providing a platform for a
more refined search of unconventional topological materials.
We theoretically studied the exciton geometric structure in layered
semiconducting transition metal dichalcogenides. Using the well-developed
three-orbital tight-binding models for the electron and hole constituents, an
effective exciton Hamiltonian can be constructed and solved perturbatively. We
show that the electron-hole Coulomb interaction gives rise to a non-trivial
inheritance of the exciton geometric structure from Bloch electrons, which
manifests as a center-of-mass anomalous Hall velocity of the exciton when two
external fields are applied on the electron and hole constituents,
respectively. The form of the center-of-mass anomalous velocity is obtained,
which is found to exhibit a non-trivial dependence on the fields as well as the
exciton wave function.
In the last years, transition metal dichalcogenides (TMDs), especially at the
two-dimensional (2D) limit, gained a large interest due to their unique optical
and electronic properties. Among them, MoS2 received great attention from the
scientific community due to its versatility, workability, and applicability in
a large number of fields such as electronics, optoelectronics and
electrocatalysis. To open the possibility of 2D-MoS2 exploitation, its
synthesis over large macroscopic areas using cost-effective methods is
fundamental. In this study, we report a method for the synthesis of large-area
(~ cm2) few-layers MoS2 via liquid precursor CVD (L-CVD), where the Mo
precursor (i.e. ammonium heptamolybdate AHM) is provided via a solution that is
spin-coated over the substrate. Given the capability of organic and inorganic
molecules, such as alkaline salts, to enhance MoS2 growth, we investigated the
action of different inorganic salts as seed promoters. In particular, by using
visible Raman spectroscopy, we focused on the effect of Na(OH), KCl, KI, and
Li(OH) on the thickness, morphology, uniformity and degree of coverage of the
grown MoS2. We optimized the process tuning parameters such as the volume of
spin-coated solution, the growth temperature, and the seed promoter
concentration, to synthesise the lowest possible thickness which resulted to be
2 layers (2L) of the highest quality. We witnessed that the addition of an
inorganic seed promoter in the solution improves the extension of the grown
MoS2 promoting lateral growth front, and therefore the degree of coverage. From
this study, we conclude that, amongst the investigated seed promoters, K-based
salts proved to grant the growth of high-quality two-layer MoS2 with optimal
and uniform coverage of the SiO2/Si substrate surface.
Recent developments in topological mechanics have demonstrated the ability of
Maxwell lattices to effectively focus stress along domain walls between
differently polarized domains. The focusing ability can be exploited to protect
the lattice bulk from accidental stress concentration -- and eventually onset
and propagation of fracture -- at structural hot spots such as defects and
cracks. A recent study has revisited the problem for structural lattices
featuring non-ideal hinges, showing that the focusing remains robust, albeit
diluted in strength. Realizing that the problem of domain wall localization has
been traditionally framed in the context of linear elasticity, in this work we
extend the study to the realm of soft structures undergoing nonlinear finite
deformation. Through experiments performed on silicone hyperelastic prototypes,
we assess and quantify the robustness of the phenomenon against the macroscopic
shape changes induced by large deformation, with special attention to
deformation levels that alter the topology of the bulk, lifting the topological
protection. Furthermore, we identify a simple geometric indicator for this
transition.
Frustration in magnetic materials arising from competing exchange
interactions can prevent the system from adopting long-range magnetic order and
can instead lead to a diverse range of novel quantum and topological states
with exotic quasiparticle excitations. Here, we review prominent examples of
such emergent phenomena, including magnetically-disordered and extensively
degenerate spin ices, which feature emergent magnetic monopole excitations,
highly-entangled quantum spin liquids with fractional spinon excitations,
topological order and emergent gauge fields, as well as complex particle-like
topological spin textures known as skyrmions. We provide an overview of recent
advances in the search for magnetically-disordered candidate materials on the
three-dimensional pyrochlore lattice and two-dimensional triangular, kagome and
honeycomb lattices, the latter with bond-dependent Kitaev interactions, and on
lattices supporting topological magnetism. We highlight experimental signatures
of these often elusive phenomena and single out the most suitable experimental
techniques that can be used to detect them. Our review also aims at providing a
comprehensive guide for designing and investigating novel frustrated magnetic
materials, with the potential of addressing some important open questions in
contemporary condensed matter physics.
Topological bandstructures interfering with moir\'e superstructures give rise
to a plethora of emergent phenomena, which are pivotal for correlated
insulating and superconducting states of twisttronics materials. While
quasiperiodicity was up to now a notion mostly reserved for solid-state
materials and cold atoms, we here demonstrate the capacity of conventional
superconducting circuits to emulate moir\'e physics in charge space. With two
examples, we show that Hofstadter's butterfly and the magic-angle effect, are
directly visible in spectroscopic transport measurements. Importantly, these
features survive in the presence of harmonic trapping potentials due to
parasitic linear capacitances. Our proposed platform benefits from
unprecedented tuning capabilities, and opens the door to probe incommensurate
physics in virtually any spatial dimension.
We derive semiclassical transport equations for a trapped atomic Fermi gas in
the BCS phase at temperatures between zero and the superfluid transition
temperature. These equations interpolate between the two well-known limiting
cases of superfluid hydrodynamics at zero temperature and the Vlasov equation
at the critical one. The linearized version of these equations, valid for small
deviations from equilibrium, is worked out and applied to two simple examples
where analytical solutions can be found: a sound wave in a uniform medium and
the quadrupole excitation in a spherical harmonic trap. In spite of some
simplifying approximations, the main qualitative results of quantum mechanical
calculations are reproduced, which are the different frequencies of the
quadrupole mode at zero and the critical temperature and strong Landau damping
at intermediate temperatures. In addition we suggest a numerical method for
solving the semiclassical equations without further approximations.
Moir\'e superlattices formed from transition metal dichalcogenides (TMDs)
have been shown to support a variety of quantum electronic phases that are
highly tunable using applied electromagnetic fields. While the valley character
of the low-energy states dramatically affects optoelectronic properties in the
constituent TMDs, this degree of freedom has yet to be fully explored in
moir\'e systems. Here, we establish twisted double bilayer WSe$_2$ as an
experimental platform to study electronic correlations within $\Gamma$-valley
moir\'e bands. Through a combination of local and global electronic
compressibility measurements, we identify charge-ordered phases at multiple
integer and fractional moir\'e band fillings $\nu$. By measuring the magnetic
field dependence of their energy gaps and the chemical potential upon doping,
we reveal spin-polarized ground states with novel spin polaron quasiparticle
excitations. In addition, an applied displacement field allows us to realize a
new mechanism of metal-insulator transition at $\nu = -1$ driven by tuning
between $\Gamma$- and $K$-valley moir\'e bands. Together, our results
demonstrate control over both the spin and valley character of the correlated
ground and excited states in this system.
Thanks to their ease of implementation, multilayer perceptrons (MLPs) have
become ubiquitous in deep learning applications. The graph underlying an MLP is
indeed multipartite, i.e. each layer of neurons only connects to neurons
belonging to the adjacent layer. In contrast, in vivo brain connectomes at the
level of individual synapses suggest that biological neuronal networks are
characterized by scale-free degree distributions or exponentially truncated
power law strength distributions, hinting at potentially novel avenues for the
exploitation of evolution-derived neuronal networks. In this paper, we present
``4Ward'', a method and Python library capable of generating flexible and
efficient neural networks (NNs) from arbitrarily complex directed acyclic
graphs. 4Ward is inspired by layering algorithms drawn from the graph drawing
discipline to implement efficient forward passes, and provides significant time
gains in computational experiments with various Erd\H{o}s-R\'enyi graphs. 4Ward
not only overcomes the sequential nature of the learning matrix method, by
parallelizing the computation of activations, but also addresses the
scalability issues encountered in the current state-of-the-art and provides the
designer with freedom to customize weight initialization and activation
functions. Our algorithm can be of aid for any investigator seeking to exploit
complex topologies in a NN design framework at the microscale.
Given any symmetry acting on a $d$-dimensional quantum field theory, there is
an associated $(d+1)$-dimensional topological field theory known as the
Symmetry TFT (SymTFT). The SymTFT is useful for decoupling the universal
quantities of quantum field theories, such as their generalized global
symmetries and 't Hooft anomalies, from their dynamics. In this work, we
explore the SymTFT for theories with Kramers-Wannier-like duality symmetry in
both $(1+1)$d and $(3+1)$d quantum field theories. After constructing the
SymTFT, we use it to reproduce the non-invertible fusion rules of duality
defects, and along the way we generalize the concept of duality defects to
\textit{higher} duality defects. We also apply the SymTFT to the problem of
distinguishing intrinsically versus non-intrinsically non-invertible duality
defects in $(1+1)$d.
We study the semi-metal/insulator quantum phase transition in
three-dimensional Dirac semi-metals by solving a set of Schwinger-Dyson
equations. We study the effect of an anisotropic fermion velocity on the
critical coupling of the transition. We consider the influence of several
different approximations that are commonly used in the literature and show that
results for the critical coupling change considerably when some of these
approximations are relaxed. Most importantly, the nature of the dependence of
the critical coupling on the anisotropy depends strongly on the approximations
that are used for the photon polarization tensor. On the one hand, this means
that calculations that include full photon dynamics are necessary to answer
even the basic question of whether the critical coupling increases or decreases
with anisotropy. On the other hand, our results mean that it is possible that
anisotropy could provide a mechanism to promote dynamical gap generation in
realistic three-dimensional Dirac semi-metallic materials.
Quantum-mechanical calculations of electron magnetotransport in graphene
Fabry-P\'{e}rot interferometers are presented with a focus on the role of
spatial structure of edge channels. For an interferometer that is made by
removing carbon atoms, which is typically realized in nanolithography
experiments, the constrictions are shown to cause strong inter-channel
scattering that establishes local equilibrium and makes the electron transport
non-adiabatic. Nevertheless, two-terminal conductance reveals a common
Aharonov-Bohm oscillation pattern, independent of crystallographic orientation,
which is accompanied by single-particle states that sweep through the Fermi
energy for the edge channels circulating along the physical boundary of the
device. The interferometer constrictions host the localized states that might
shorten the device or disrupt the oscillation pattern. For an interferometer
that is created by electrostatic confinement, which is typically done in the
split-gate experiments, electron transport is shown to be adiabatic if the
staggered potential is introduced additionally into the model. Interference
visibility decays exponentially with temperature with a weaker dependence at
low temperature.
Me-graphene (MeG) is a novel two-dimensional (2D) carbon allotrope. Due to
its attractive electronic and structural properties, it is important to study
the mechanical behavior of MeG in its monolayer and nanotube topologies. In
this work, we conducted fully atomistic reactive molecular dynamics simulations
using the Tersoff force field to investigate their mechanical properties and
fracture patterns. Our results indicate that Young's modulus of MeG monolayers
is about 414 GPa and in the range of 421-483 GPa for the nanotubes investigated
here. MeG monolayers and MeGNTs directly undergo from elastic to complete
fracture under critical strain without a plastic regime.
We propose a novel analog memory device utilizing the gigantic magnetic Weyl
semimetal (MWSM) domain wall (DW) magnetoresistance. We predict that the
nucleation of domain walls between contacts will strongly modulate the
conductance and allow for multiple memory states, which has been long
sought-after for use in magnetic random access memories or memristive
neuromorphic computing platforms. We motivate this conductance modulation by
analyzing the electronic structure of the helically-magnetized MWSM
Hamiltonian, and report tunable flat bands in the direction of transport in a
helically-magnetized region of the sample for Bloch and Neel-type domain walls
via the onset of a local axial Landau level spectrum within the bulk of the
superlattice. We show that Bloch devices also provide means for the generation
of chirality-polarized currents, which provides a path towards nanoelectronic
utilization of chirality as a new degree of freedom in spintronics.
The theory of topological phases of matter predicts invariants protected only
by crystalline symmetry, yet it has been unclear how to extract these from
microscopic calculations in general. Here we show how to extract a set of
many-body invariants $\{\Theta_{\text{o}}^{\pm}\}$, where ${\text{o}}$ is a
high symmetry point, from partial rotations in (2+1)D invertible fermionic
states. Our results apply in the presence of magnetic field and Chern number $C
\neq 0$, in contrast to previous work. $\{\Theta_{\text{o}}^{\pm}\}$ together
with $C$, chiral central charge $c_-$, and filling $\nu$ provide a complete
many-body characterization of the topological state with symmetry group $G =
\text{U}(1) \times_\phi [\mathbb{Z}^2 \rtimes \mathbb{Z}_M]$. Moreover, all
these many-body invariants can be obtained from a single bulk ground state,
without inserting additional defects. We perform numerical computations on the
square lattice Hofstadter model. Remarkably, these match calculations from
conformal and topological field theory, where $G$-crossed modular $S, T$
matrices of symmetry defects play a crucial role. Our results provide
additional colorings of Hofstadter's butterfly, extending recently discovered
colorings by the discrete shift and quantized charge polarization.
In this study, we explore the impact of network topology on the approximation
capabilities of artificial neural networks (ANNs), with a particular focus on
complex topologies. We propose a novel methodology for constructing complex
ANNs based on various topologies, including Barab\'asi-Albert,
Erd\H{o}s-R\'enyi, Watts-Strogatz, and multilayer perceptrons (MLPs). The
constructed networks are evaluated on synthetic datasets generated from
manifold learning generators, with varying levels of task difficulty and noise,
and on real-world datasets from the UCI suite. Our findings reveal that complex
topologies lead to superior performance in high-difficulty regimes compared to
traditional MLPs. This performance advantage is attributed to the ability of
complex networks to exploit the compositionality of the underlying target
function. However, this benefit comes at the cost of increased forward-pass
computation time and reduced robustness to graph damage. Additionally, we
investigate the relationship between various topological attributes and model
performance. Our analysis shows that no single attribute can account for the
observed performance differences, suggesting that the influence of network
topology on approximation capabilities may be more intricate than a simple
correlation with individual topological attributes. Our study sheds light on
the potential of complex topologies for enhancing the performance of ANNs and
provides a foundation for future research exploring the interplay between
multiple topological attributes and their impact on model performance.
We consider here a dynamic model for a gas in which a variable number of
particles $N \in \mathbb{N}_0 := \mathbb{N} \cup \{0\}$ can be located at a
site. This point of view leads us to the grand-canonical framework and the need
for a chemical potential. The dynamics is played by the shift acting on the set
of sequences $\Omega := \mathcal{A}^\mathbb{N}$, where the alphabet is
$\mathcal{A} := \{1,2,...,r\}$. Introducing new variables like the number of
particles $N$ and the chemical potential $\mu$, we adapt the concept of
grand-canonical partition sum of thermodynamics of gases to a symbolic
dynamical setting considering a Lipschitz family of potentials $% (A_N)_{N \in
\mathbb{N}_0}$, $A_N:\Omega \to \mathbb{R}$. Our main results will be obtained
from adapting well-known properties of the Thermodynamic Formalism for IFS with
weights to our setting. In this direction, we introduce the
grand-canonical-Ruelle operator: $\mathcal{L}_{\beta, \mu}(f)=g$, when,
$\beta>0,\mu<0,$ and
\medskip $\,\,\,\,\,\,\,\,\,\,\,\,\,\,g(x)= \mathcal{L}_{\beta, \mu}(f) (x)
=\sum_{N \in \mathbb{N}_0} e^{\beta \, \mu\, N }\, \sum_{j \in \mathcal{A}}
e^{- \,\beta\, A_N(jx)} f(jx). $ \medskip
We show the existence of the main eigenvalue, an associated eigenfunction,
and an eigenprobability for $\mathcal{L}_{\beta, \mu}^*$. We can show the
analytic dependence of the eigenvalue on the grand-canonical potential.
Considering the concept of entropy for holonomic probabilities on $\Omega\times
\mathcal{A}^{\mathbb{N}_0}$, we relate these items with the variational problem
of maximizing grand-canonical pressure. In another direction, in the appendix,
we briefly digress on a possible interpretation of the concept of topological
pressure as related to the gas pressure of gas thermodynamics.
Recent studies on disorder-induced many-body localization (MBL) in
non-Hermitian quantum systems have attracted great interest. However, the
non-Hermitian disorder-free MBL still needs to be clarified. We consider a
one-dimensional interacting Stark model with nonreciprocal hoppings having
time-reversal symmetry, the properties of which are boundary dependent. Under
periodic boundary conditions (PBCs), such a model exhibits three types of phase
transitions: the real-complex transition of eigenenergies, the topological
phase transition, and the non-Hermitian Stark MBL transition. The real-complex
and topological phase transitions occur at the same point in the thermodynamic
limit, but do not coincide with the non-Hermitian Stark MBL transition, which
is quite different from the non-Hermitian disordered cases. By the level
statistics, the system undergoes from the Ginibre ensemble (GE) to Gaussian
orthogonal ensemble (GOE) to Possion ensemble (PE) transitions with the
increase of the linear tilt potential's strength $\gamma$. The real-complex
transition of the eigenvalues is accompanied by the GE-to-GOE transition in the
ergodic regime. Moreover, the second transition of the level statistics
corresponds to the occurrence of non-Hermitian Stark MBL. We demonstrate that
the non-Hermitian Stark MBL is robust and shares many similarities with
disorder-induced MBL, which several existing characteristic quantities of the
spectral statistics and eigenstate properties can confirm. The dynamical
evolutions of the entanglement entropy and the density imbalance can
distinguish the real-complex and Stark MBL transitions. Finally, we find that
our system under open boundary conditions lacks a real-complex transition, and
the transition of non-Hermitian Stark MBL is the same as that under PBCs.
Recently, models with long-range interactions -- known as Hatsugai-Kohmoto
(HK) models -- have emerged as a promising tool to study the emergence of
superconductivity and topology in strongly correlated systems. Two obstacles,
however, have made it difficult to understand the applicability of these
models, especially to topological features: they have thermodynamically large
ground state degeneracies, and they tacitly assume spin conservation. We show
that neither are essential to HK models and that both can be avoided by
introducing interactions between tight-binding states in the orbital basis,
rather than between energy eigenstates. To solve these "orbital" models, we
introduce a general technique for solving HK models and show that previous
models appear as special cases. We illustrate our method by exactly solving
graphene and the Kane-Mele model with HK interactions. Both realize Mott
insulating phases with finite magnetic susceptibility; the graphene model has a
fourfold degenerate ground state while the Kane-Mele model has a nondegenerate
ground state in the presence of interactions. Our technique then allows us to
study the effect of strong interactions on symmetry-enforced degeneracy in
spin-orbit coupled double-Dirac semimetals. We show that adding HK interactions
to a double Dirac semi-metal leads to a Mott insulating, spin liquid phase. We
then use a Schrieffer-Wolff transformation to express the low-energy
Hamiltonian in terms of the spin degrees of freedom, making the spin-charge
separation explicit. Finally, we enumerate a broader class of
symmetry-preserving HK interactions and show how they can violate insulating
filling constraints derived from space group symmetries. This suggests that new
approaches are needed to study topological order in the presence of long-range
interactions of the HK type.
Universal scaling laws govern the density of topological defects generated
while crossing an equilibrium continuous phase transition. The Kibble-Zurek
mechanism (KZM) predicts the dependence on the quench time for slow quenches.
By contrast, for fast quenches, the defect density scales universally with the
amplitude of the quench. We show that universal scaling laws apply to dynamic
phase transitions driven by an oscillating external field. The difference in
the energy response of the system to a periodic potential field leads to energy
absorption, spontaneous breaking of symmetry, and its restoration. We verify
the associated universal scaling laws, providing evidence that the critical
behavior of non-equilibrium phase transitions can be described by time-average
critical exponents combined with the KZM. Our results demonstrate that the
universality of critical dynamics extends beyond equilibrium criticality,
facilitating the understanding of complex non-equilibrium systems.
We investigate the effects of ellipticity-induced curvature on atomic
Bose-Einstein condensates confined in quasi-one-dimensional closed-loop
waveguides. Our theoretical study reveals intriguing phenomena arising from the
interplay between curvature and interactions. Density modulations are observed
in regions of high curvature, but these modulations are suppressed by strong
repulsive interactions. Additionally, we observe phase accumulation in regions
with the lowest curvature when the waveguide with persistent current is
squeezed. Furthermore, waveguides hosting persistent currents exhibit dynamic
transformations between states with different angular momenta. These findings
provide insights into the behavior of atomic condensates in curved waveguides,
with implications for fundamental physics and quantum technologies. The
interplay between curvature and interactions offers opportunities for exploring
novel quantum phenomena and engineering quantum states in confined geometries.
Controlled charge flows are fundamental to many areas of science and
technology, serving as carriers of energy and information, as probes of
material properties and dynamics, and as a means of revealing or even inducing
broken symmetries. Emerging methods for light-based current control offer
promising routes beyond the speed and adaptability limitations of conventional
voltage-driven systems. However, optical generation and manipulation of
currents at nanometer spatial scales remains a basic challenge and a crucial
step towards scalable optoelectronic systems for microelectronics and
information science. Here, we introduce vectorial optoelectronic metasurfaces
in which ultrafast light pulses induce local directional charge flows around
symmetry-broken plasmonic nanostructures, with tunable responses and arbitrary
patterning down to sub-diffractive nanometer scales. Local symmetries and
vectorial current distributions are revealed by polarization- and
wavelength-sensitive electrical readout and terahertz (THz) emission, while
spatially-tailored global currents are demonstrated in the direct generation of
elusive broadband THz vector beams. We show that in graphene, a detailed
interplay between electrodynamic, thermodynamic, and hydrodynamic degrees of
freedom gives rise to rapidly-evolving nanoscale driving forces and charge
flows under extreme temporal and spatial confinement. These results set the
stage for versatile patterning and optical control over nanoscale currents in
materials diagnostics, THz spectroscopies, nano-magnetism, and ultrafast
information processing.
The claims that a copper-substituted lead apatite, denoted as
CuPb$_9$(PO$_4$)$_6$OH$_2$, could be a room-temperature superconductor have led
to an intense research activity. While other research groups did not confirm
these claims, and the hope of realizing superconductivity in this compound has
all but vanished, other findings have emerged which motivate further work on
this material. In fact, Density Functional Theory (DFT) calculations indicate
the presence of two nearly flat bands near the Fermi level, which are known to
host strongly correlated physics. In order to facilitate the theoretical study
of the intriguing physics associated with these two flat bands, we propose a
minimal tight-binding model which reproduces their main features. We then
calculate the orbital magnetic susceptibility of our two-band model and find a
large diamagnetic response which arises due to the multi-orbital nature of the
bands and which could provide an explanation for the strong diamagnetism
reported in experiments.
We study the appearance of topological Floquet flat bands in
alternating-twist multilayer graphene, which has alternating relative twist
angle $\pm\theta$ near the first magic angle. While the system hosts both flat
bands and a steep Dirac cone in the static case, the circularly polarized laser
beam can open a gap at the Moir\'{e} $K$ point and create Floquet flat bands
carrying nonzero Chern numbers. Considering recent lattice-relaxation results,
we find that the topological flat band is well-isolated for the effective
interlayer tunneling in $n=3, 4, 5$ layers. Such dynamically produced
topological flat bands are potentially observed in the experiment and thus
provide a feasible way to realize the fractional Chern insulator.
We propose a general framework to characterize gapped infra-red (IR) phases
of theories with non-invertible (or categorical) symmetries. In this paper we
focus on (1+1)d gapped phases with fusion category symmetries. The approach
that we propose uses the Symmetry Topological Field Theory (SymTFT) as a key
input: associated to a field theory in d spacetime dimensions, the SymTFT lives
in one dimension higher and admits a gapped boundary, which realizes the
categorical symmetries. It also admits a second, physical, boundary, which is
generically not gapped. Upon interval compactification of the SymTFT by
colliding the gapped and physical boundaries, we regain the original theory. In
this paper, we realize gapped symmetric phases by choosing the physical
boundary to be a gapped boundary condition as well. This set-up provides
computational power to determine the number of vacua, the symmetry breaking
pattern, and the action of the symmetry on the vacua. The SymTFT also
manifestly encodes the order parameters for these gapped phases, thus providing
a generalized, categorical Landau paradigm for (1+1)d gapped phases. We find
that for non-invertible symmetries the order parameters involve multiplets
containing both untwisted and twisted sector local operators, and hence can be
interpreted as mixtures of conventional and string order parameters. We also
observe that spontaneous breaking of non-invertible symmetries can lead to
vacua that are physically distinguishable: unlike the standard symmetries
described by groups, non-invertible symmetries can have different actions on
different vacua of an irreducible gapped phase. This leads to the presence of
relative Euler terms between physically distinct vacua. We also provide a
mathematical description of symmetric gapped phases as 2-functors from
delooping of fusion category characterizing the symmetry to Euler completion of
2-vector spaces.
We propose a unified framework to classify gapped infra-red (IR) phases with
categorical symmetries, leading to a generalized, categorical Landau paradigm.
This is applicable in any dimension and gives a succinct, comprehensive, and
computationally powerful approach to classifying gapped symmetric phases. The
key tool is the symmetry topological field theory (SymTFT), which is a one
dimension higher TFT with two boundaries, which we choose both to be
topological. We illustrate the general idea for (1+1)d gapped phases with
categorical symmetries and suggest higher-dimensional extensions.
The development of two-dimensional (2D) room temperature magnets is of great
significance to the practical application of spintronic devices. However, the
number of synthesized intrinsic 2D magnets is limited and the performances of
them are not satisfactory, e.g. typically with low Curie temperature and poor
environmental stability. Magnetic modulation based on developed 2D materials,
especially non-magnetic 2D materials, can bring us new breakthroughs. Herein,
we report room temperature ferromagnetism in halogenated MoS2 monolayer under
the synergistic effect of strain engineering and charge injection, and the
combined implementation of these two processes is based on the halogenation of
MoS2. The adsorbed halogen atoms X (X = F, Cl, and Br) on the surface leads to
lattice superstretching and hole injection, resulting in MoS2 monolayer
exhibiting half-metallic properties, with one spin channel being gapless in the
band structure. The Curie temperature of halogenated MoS2 monolayer is 513~615
K, which is much higher than the room temperature. In addition, large magnetic
anisotropy energy and good environmental stability make halogenated MoS2
display great advantages in practical spintronic nanodevices.
Superfluidity is a well-characterized quantum phenomenon which entails
frictionless-motion of mesoscopic particles through a superfluid, such as
$^4$He or dilute atomic-gases at very low temperatures. As shown by Landau, the
incompatibility between energy- and momentum-conservation, which ultimately
stems from the spectrum of the elementary excitations of the superfluid,
forbids quantum-scattering between the superfluid and the moving mesoscopic
particle, below a critical speed-threshold. Here we predict that
frictionless-motion can also occur in the absence of a standard superfluid,
i.e. when a He atom travels through a narrow (5,5) carbon-nanotube (CNT). Due
to the quasi-linear dispersion of the plasmon and phonon modes that could
interact with He, the (5,5) CNT embodies a solid-state analog of the
superfluid, thereby enabling straightforward transfer of Landau's criterion of
superfluidity. As a result, Landau's equations acquire broader generality, and
may be applicable to other nanoscale friction phenomena, whose description has
been so far purely classical.
Unlike the spin-1/2 fermions, the Lieb and Dice lattices both host
triply-degenerate low-energy excitations. Here, we discuss Moir\'e structures
involving twisted bilayers of these lattices, which are shown to exhibit a
tunable number of isolated flat bands near the Fermi level. These flat bands
remain isolated from the high-energy bands even in the presence of small
higher-order terms and chiral-symmetry-breaking interlayer tunneling. At small
twist angles, thousands of flat bands can be generated to substantially amplify
flat band physics. We demonstrate that these flat bands carry substantial
quantum weight so that upon adding a BCS-type pairing potential, the associated
superfluid weight would also be large, and the critical superconducting
temperature would be tunable. Our study suggests a new pathway for flat-band
engineering based on twisted bilayer Lieb and Dice lattices.
Graphene zigzag nanoribbons, initially in a topologically ordered state,
undergo a topological phase transition into crossover phases distinguished by
quasi-topological order. We computed mutual information for both the
topologically ordered phase and its crossover phases, revealing the following
results: (i) In the topologically ordered phase, A-chirality carbon lines
strongly entangle with B-chirality carbon lines on the opposite side of the
zigzag ribbon. This entanglement persists but weakens in crossover phases. (ii)
The upper zigzag edge entangles with non-edge lines of different chirality on
the opposite side of the ribbon. (iii) Entanglement increases as more carbon
lines are grouped together, regardless of the lines' chirality. No long-range
entanglement was found in the symmetry-protected phase in the absence of
disorder.
An unconventional bosonization approach that employs a modified Fermi-Bose
correspondence is used to obtain the tunneling density of states (TDOS) of
fractional quantum Hall (FQHE) edges in the vicinity of a point contact. The
chiral Luttinger liquid model is generally used to describe FQHE edge
excitations. We introduce a bosonization procedure to study edge state
transport in Laughlin states at filling $\nu = 1/m$ with $m$ odd (single edge
mode) in the presence of a point contact constriction that brings the top and
bottom edges of the sample into close proximity. The unconventional
bosonization involves modifying the Fermi-Bose correspondence to incorporate
backscattering at the point contact, leaving the action of the theory purely
quadratic even in presence of the inhomogeneity. We have shown convincingly in
earlier works that this procedure correctly reproduces the most singular parts
of the Green functions of the system even when mutual forward scattering
between fermions are included. The most singular part of the density-density
correlation function (DDCF) relevant to TDOS calculation is computed using a
generating functional approach. The TDOS for both the electron tunneling as
well as the Laughlin quasiparticle tunneling cases is obtained and is found to
agree with previous results in the literature. For electron tunneling the
well-known universal power laws for TDOS viz. $ \sim \mbox{ }\omega^{ m-1 }$
and for quasi-particle tunneling the power law $ \sim \mbox{ } \omega^{
\frac{1}{m}-1 } $ are both correctly recovered using our unconventional
bosonization scheme. This demonstrates convincingly the utility of the present
method which unlike conventional approaches, does not treat the point-contact
as an afterthought and yet remains solvable so long as only the most singular
parts of the correlation functions are desired.
Chaotic time series forecasting has been far less understood despite its
tremendous potential in theory and real-world applications. Traditional
statistical/ML methods are inefficient to capture chaos in nonlinear dynamical
systems, especially when the time difference $\Delta t$ between consecutive
steps is so large that a trivial, ergodic local minimum would most likely be
reached instead. Here, we introduce a new long-short-term-memory (LSTM)-based
recurrent architecture by tensorizing the cell-state-to-state propagation
therein, keeping the long-term memory feature of LSTM while simultaneously
enhancing the learning of short-term nonlinear complexity. We stress that the
global minima of chaos can be most efficiently reached by tensorization where
all nonlinear terms, up to some polynomial order, are treated explicitly and
weighted equally. The efficiency and generality of our architecture are
systematically tested and confirmed by theoretical analysis and experimental
results. In our design, we have explicitly used two different many-body
entanglement structures---matrix product states (MPS) and the multiscale
entanglement renormalization ansatz (MERA)---as physics-inspired tensor
decomposition techniques, from which we find that MERA generally performs
better than MPS, hence conjecturing that the learnability of chaos is
determined not only by the number of free parameters but also the tensor
complexity---recognized as how entanglement entropy scales with varying
matricization of the tensor.

Date of feed: Tue, 24 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) **Optimized Analysis of the AC Magnetic Susceptibility Data in Several Spin-Glass Systems using the Vogel-Fulcher and Power Laws. (arXiv:2310.13706v1 [cond-mat.dis-nn])**

Mouli Roy-Chowdhury, Mohindar S. Seehra, Subhash Thota

**Boundary conditions, phase distribution and hidden symmetry in 1D localization. (arXiv:2310.13726v1 [cond-mat.dis-nn])**

I. M. Suslov (P.L.Kapitza Institute for Physical Problems, 119334 Moscow, Russia)

**On quantum melting of superfluid vortex crystals: from Lifshitz scalar to dual gravity. (arXiv:2310.13741v1 [cond-mat.quant-gas])**

Dung Xuan Nguyen, Sergej Moroz

**Designing Moir\'e Patterns by Bending. (arXiv:2310.13743v1 [cond-mat.mes-hall])**

Pierre A. Pantaleón, Héctor Sainz-Cruz, Francisco Guinea

**Quantum vortex lattice via Lifshitz duality. (arXiv:2310.13794v1 [cond-mat.str-el])**

Yi-Hsien Du, Ho Tat Lam, Leo Radzihovsky

**Ultralow lattice thermal transport and considerable wave-like phonon tunneling in chalcogenide perovskite BaZrS$_3$. (arXiv:2310.13851v1 [cond-mat.mtrl-sci])**

Yu Wu, Ying Chen, Qiaoqiao Li, Kui Xue, Hezhu Shao, Hao Zhang, Liujiang Zhou

**Symmetry-dependent dielectric screening of optical phonons in monolayer graphene. (arXiv:2310.13868v1 [cond-mat.mes-hall])**

Loïc Moczko, Sven Reichardt, Aditya Singh, Xin Zhang, Luis E. Parra López, Joanna L. P. Wolff, Aditi Raman Moghe, Etienne Lorchat, Rajendra Singh, Kenji Watanabe, Takashi Taniguchi, Hicham Majjad, Michelangelo Romeo, Arnaud Gloppe, Ludger Wirtz, Stéphane Berciaud

**Advances in Complex Oxide Quantum Materials Through New Approaches to Molecular Beam Epitaxy. (arXiv:2310.13902v1 [cond-mat.mtrl-sci])**

Gaurab Rimal, Ryan B. Comes

**Quantum theory of the magnetochiral anisotropy coefficient in ZrTe$_5$. (arXiv:2310.13909v1 [cond-mat.mes-hall])**

Yi-Xiang Wang, Fuxiang Li

**Valley polarization and photocurrent generation in transition metal dichalcogenide alloy MoS$_{2x}$Se$_{2(1-x)}$. (arXiv:2310.13924v1 [cond-mat.mes-hall])**

Chumki Nayak, Suvadip Masanta, Sukanya Ghosh, Shubhadip Moulick, Atindra Nath Pal, Indrani Bose, Achintya Singha

**Character of electronic states in the transport gap of molecules on surfaces. (arXiv:2310.13962v1 [cond-mat.mes-hall])**

Abhishek Grewal, Christopher C. Leon, Klaus Kuhnke, Klaus Kern, Olle Gunnarsson

**The Emergence of Anisotropic Superconductivity in the Nodal-line Semi-metal TlTaSe2. (arXiv:2310.13986v1 [cond-mat.supr-con])**

Mukhtar Lawan Adam, Ibrahim Buba Garba, Sulaiman Muhammad Gana, Bala Ismail Adamu, Abba Alhaji Bala, Abdulsalam Aji Suleiman, Ahmad Hamisu, Tijjani Hassan Darma, Auwal Musa, Abdulkadir S. Gidado

**Topological Magnetoresistance of Magnetic Skyrmionic Bubbles. (arXiv:2310.13997v1 [cond-mat.mtrl-sci])**

Fei Li, Hao Nie, Yu Zhao, Zhihe Zhao, Juntao Huo, Hongxian Shen, Sida Jiang, Renjie Chen, Aru Yan, S-W Cheong, Weixing Xia, Lunyong Zhang, Jianfei Sun

**Topological phases induced by charge fluctuations in Majorana wires. (arXiv:2310.14035v1 [cond-mat.mes-hall])**

M. S. Shustin, S. V. Aksenov, I. S. Burmistrov

**Anionic Character of the Conduction Band of Sodium Chloride. (arXiv:2310.14070v1 [cond-mat.mtrl-sci])**

Christopher C. Leon, Abhishek Grewal, Klaus Kuhnke, Klaus Kern, Olle Gunnarsson

**Localization renormalization and quantum Hall systems. (arXiv:2310.14074v1 [cond-mat.mes-hall])**

Bartholomew Andrews, Dominic Reiss, Fenner Harper, Rahul Roy

**Bound states and local topological phase diagram of classical impurity spins coupled to a Chern insulator. (arXiv:2310.14097v1 [cond-mat.mes-hall])**

Simon Michel, Axel Fünfhaus, Robin Quade, Roser Valentí, Michael Potthoff

**Properties of an {\alpha}-T3 Aharonov-Bohm quantum ring: Interplay of Rashba spin-orbit coupling and topological defect. (arXiv:2310.14169v1 [cond-mat.mes-hall])**

Mijanur Islam, Saurabh Basu

**Carrier doping of Bi$_2$Se$_3$ surface by chemical adsorption -- a DFT study. (arXiv:2310.14177v1 [cond-mat.mtrl-sci])**

Cheng Fan, Kazuyuki Sakamoto, Peter Krüger

**Multi-charged moments and symmetry-resolved R\'enyi entropy of free compact boson for multiple disjoint intervals. (arXiv:2310.14186v1 [hep-th])**

Himanshu Gaur, Urjit A. Yajnik

**Controlling spin-orbit coupling to tailor type-II Dirac bands. (arXiv:2310.14202v1 [cond-mat.mtrl-sci])**

Nguyen Huu Lam, Phuong Lien Nguyen, Byoung Ki Choi, Trinh Thi Ly, Ganbat Duvjir, Tae Gyu Rhee, Yong Jin Jo, Tae Heon Kim, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Younghun Hwang, Young Jun Chang, Jaekwang Lee, Jungdae Kim

**Real-space formulation of topology for disordered Rice-Mele chains without chiral symmetry. (arXiv:2310.14204v1 [cond-mat.mes-hall])**

Kiminori Hattori, Ata Yamaguchi

**Machine-learning-assisted analysis of transition metal dichalcogenide thin-film growth. (arXiv:2310.14205v1 [cond-mat.mtrl-sci])**

Hyuk Jin Kim, Minsu Chong, Tae Gyu Rhee, Yeong Gwang Khim, Min-Hyoung Jung, Young-Min Kim, Hu Young Jeong, Byoung Ki Choi, Young Jun Chang

**Atomic arrangement of van der Waals heterostructures using X-ray scattering and crystal truncation rod analysis. (arXiv:2310.14207v1 [cond-mat.mtrl-sci])**

Ryung Kim, Byoung Ki Choi, Kyeong Jun Lee, Hyuk Jin Kim, Hyun Hwi Lee, Tae Gyu Rhee, Yeong Gwang Khim, Young Jun Chang, Seo Hyoung Chang

**Topologically Variable and Volumetric Morphing of 3D Architected Materials with Shape Locking. (arXiv:2310.14220v1 [cond-mat.mtrl-sci])**

Kai Xiao, Yuhao Wang, Chao Song, Bihui Zou, Zihe Liang, Heeseung Han, Yilin Du, Hanqing Jiang, Jaehyung Ju

**Investigation of the mechanism of the anomalous Hall effects in Cr2Te3/(BiSb)2(TeSe)3 heterostructure. (arXiv:2310.14259v1 [cond-mat.mtrl-sci])**

Seong Won Cho, In Hak Lee, Youngwoong Lee, Sangheon Kim, Yeong Gwang Khim, Seung-Young Park, Younghun Jo, Junwoo Choi, Seungwu Han, Young Jun Chang, Suyoun Lee

**Superconductivity in the high-entropy ceramics Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx with possible nontrivial band topology. (arXiv:2310.14271v1 [cond-mat.supr-con])**

Lingyong Zeng, Xunwu Hu, Yazhou Zhou, Mebrouka Boubeche, Ruixin Guo, Yang Liu, Si-Chun Luo, Shu Guo, Kuan Li, Peifeng Yu, Chao Zhang, Wei-Ming Guo, Liling Sun, Dao-Xin Yao, Huixia Luo

**On the dilemma between percolation processes and fluctuating pairs as the origin of the enhanced conductivity above the superconducting transition in cuprates. (arXiv:2310.14284v1 [cond-mat.supr-con])**

I. F. Llovo, J. Mosqueira, F. Vidal

**Atomic-Scale Terahertz Near Fields for Ultrafast Tunnelling Spectroscopy. (arXiv:2310.14335v1 [cond-mat.mes-hall])**

Vedran Jelic, Stefanie Adams, Mohamed Hassan, Kaedon Cleland-Host, S. Eve Ammerman, Tyler L. Cocker

**Effects of phylogeny on coexistence in model communities. (arXiv:2310.14392v1 [q-bio.PE])**

Carlos A. Servan, Jose A. Capitan, Zachary R. Miller, Stefano Allesina

**Collective charge excitations between moir\'e-minibands in twisted WSe2 bilayers from resonant inelastic light scattering. (arXiv:2310.14417v1 [cond-mat.str-el])**

Nihit Saigal, Lennart Klebl, Hendrik Lambers, 1Sina Bahmanyar, Veljko Antić, Dante M. Kennes, Tim O. Wehling, Ursula Wurstbauer

**Giant Magnetothermal Conductivity Switching in Semimetallic WSi$_{2}$ Single Crystals. (arXiv:2310.14467v1 [cond-mat.mtrl-sci])**

Karl G. Koster, Jackson Hise, Joseph P. Heremans, Joshua E. Goldberger

**Topological electronic states in holey graphyne. (arXiv:2310.14625v1 [cond-mat.mes-hall])**

Yong-Cheng Jiang, Toshikaze Kariyado, Xiao Hu

**Reconfigurable Multifunctional van der Waals Ferroelectric Devices and Logic Circuits. (arXiv:2310.14648v1 [cond-mat.mes-hall])**

Ankita Ram, Krishna Maity, Cédric Marchand, Aymen Mahmoudi, Aseem Rajan Kshirsagar, Mohamed Soliman, Takashi Taniguchi, Kenji Watanabe, Bernard Doudin, Abdelkarim Ouerghi, Sven Reichardt, Ian O'Connor, Jean-Francois Dayen

**On the absence of structure factors in concentrated colloidal suspensions and nanocomposites. (arXiv:2310.14682v1 [cond-mat.soft])**

Anne-Caroline Genix (L2C), Julian Oberdisse (L2C)

**Complete zero-energy flat bands of surface states in fully gapped chiral noncentrosymmetric superconductors. (arXiv:2310.14800v1 [cond-mat.supr-con])**

Clara J. Lapp, Julia M. Link, Carsten Timm

**pyCOFBuilder: A python package for automated assembly of Covalent Organic Framework structures. (arXiv:2310.14822v1 [cond-mat.mtrl-sci])**

Felipe Lopes Oliveira, Pierre Mothé Esteves

**Feature Spectrum Topology. (arXiv:2310.14832v1 [cond-mat.mtrl-sci])**

Baokai Wang, Yi-Chun Hung, Xiaoting Zhou, Tzen Ong, Hsin Lin

**Inheritance of the exciton geometric structure from Bloch electrons in two-dimensional layered semiconductors. (arXiv:2310.14856v1 [cond-mat.mes-hall])**

Jianju Tang, Songlei Wang, Hongyi Yu

**Effects of inorganic seed promoters on MoS2 few-layers grown via chemical vapor deposition. (arXiv:2310.14923v1 [cond-mat.mtrl-sci])**

Alessandro Cataldo (1 2), Pinaka Pani Tummala (1 3 4), Christian Martella (1), Carlo Spartaco Casari (5), Alessandro Molle (1), Alessio Lamperti (1) ((1) CNR-IMM, Agrate Brianza Unit, via C. Olivetti 2, Agrate Brianza, I-20864, Italy (2) Dipartimento di Chimica, Materiali e Ingegneria Chimica, Politecnico di Milano, P.zza Leonardo da Vinci 32, edificio 6, I-20133 Milano, Italy (3) Department of Physics and Astronomy, University of Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium (4) Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP), Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, via della Garzetta 48, 25133 Brescia, Italy (5) Dipartimento di Energia, Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy)

**Robustness of stress focusing in soft lattices under topology-switching deformation. (arXiv:2310.14972v1 [cond-mat.soft])**

Caleb Widstrand, Xiaoming Mao, Stefano Gonella

**Experimental signatures of quantum and topological states in frustrated magnetism. (arXiv:2310.15071v1 [cond-mat.str-el])**

J. Khatua, B. Sana, A. Zorko, M. Gomilsek, K. Sethupathi M. S. Ramachandra Rao, M. Baenitz, B. Schmidt, P. Khuntia

**Emulating moir\'e materials with quasiperiodic circuit quantum electrodynamics. (arXiv:2310.15103v1 [cond-mat.mes-hall])**

Tobias Herrig, Christina Koliofoti, Jedediah H. Pixley, Elio J. König, Roman-Pascal Riwar

**Dynamics of a trapped Fermi gas in the BCS phase. (arXiv:cond-mat/0509373v3 [cond-mat.other] UPDATED)**

M. Urban, P. Schuck

**Tunable spin and valley excitations of correlated insulators in $\Gamma$-valley moir\'e bands. (arXiv:2206.10631v3 [cond-mat.mes-hall] UPDATED)**

Benjamin A. Foutty, Jiachen Yu, Trithep Devakul, Carlos R. Kometter, Yang Zhang, Kenji Watanabe, Takashi Taniguchi, Liang Fu, Benjamin E. Feldman

**4Ward: a Relayering Strategy for Efficient Training of Arbitrarily Complex Directed Acyclic Graphs. (arXiv:2209.02037v2 [cs.NE] UPDATED)**

Tommaso Boccato, Matteo Ferrante, Andrea Duggento, Nicola Toschi

**Symmetry TFTs for Non-Invertible Defects. (arXiv:2209.11062v3 [hep-th] UPDATED)**

Justin Kaidi, Kantaro Ohmori, Yunqin Zheng

**Phase transitions in 3-dimensional Dirac semi-metals using Schwinger-Dyson equations. (arXiv:2210.08563v2 [cond-mat.str-el] UPDATED)**

Margaret E. Carrington, Wade N. Cowie, Brett A. Meggison

**Edge channels in a graphene Fabry-Perot interferometer. (arXiv:2210.15036v3 [cond-mat.mes-hall] UPDATED)**

S. Ihnatsenka

**Exploring the Elastic Properties and Fracture Patterns of Me-Graphene Monolayers and Nanotubes through Reactive Molecular Dynamics Simulations. (arXiv:2303.07518v2 [cond-mat.mtrl-sci] UPDATED)**

Marcelo L. Pereira Junior, José. M. De Sousa, Wjefferson H. S. Brandão, Douglas. S. Galvão, Alexandre F. Fonseca, Luiz A. Ribeiro Junior

**Flat bands and multi-state memory devices from chiral domain wall superlattices in magnetic Weyl semimetals. (arXiv:2303.16918v3 [cond-mat.mes-hall] UPDATED)**

Vivian Rogers, Swati Chaudhary, Richard Nguyen, Jean Anne Incorvia

**Complete crystalline topological invariants from partial rotations in (2+1)D invertible fermionic states and Hofstadter's butterfly. (arXiv:2303.16919v2 [cond-mat.str-el] UPDATED)**

Yuxuan Zhang, Naren Manjunath, Ryohei Kobayashi, Maissam Barkeshli

**Beyond Multilayer Perceptrons: Investigating Complex Topologies in Neural Networks. (arXiv:2303.17925v2 [cs.NE] UPDATED)**

Tommaso Boccato, Matteo Ferrante, Andrea Duggento, Nicola Toschi

**Grand-canonical Thermodynamic Formalism via IFS: volume, temperature, gas pressure and grand-canonical topological pressure. (arXiv:2305.01590v3 [math.DS] UPDATED)**

A. O. Lopes, E. R. Oliveira, W. de S. Pedra, V. Vargas

**From Ergodicity to Many-Body Localization in a One-Dimensional Interacting Non-Hermitian Stark System. (arXiv:2305.13636v2 [cond-mat.dis-nn] UPDATED)**

Jinghu Liu, Zhihao Xu

**Ground state stability, symmetry, and degeneracy in Mott insulators with long range interactions. (arXiv:2306.00221v2 [cond-mat.str-el] UPDATED)**

Dmitry Manning-Coe, Barry Bradlyn

**Universal defect density scaling in an oscillating dynamic phase transition. (arXiv:2306.03803v2 [cond-mat.stat-mech] UPDATED)**

Wei-can Yang, Makoto Tsubota, Adolfo del Campo, Hua-Bi Zeng

**Engineering phase and density of Bose-Einstein condensates in curved waveguides with toroidal topology. (arXiv:2306.11873v4 [cond-mat.quant-gas] UPDATED)**

Yelyzaveta Nikolaieva, Luca Salasnich, Alexander Yakimenko

**Light-Driven Nanoscale Vectorial Currents. (arXiv:2307.11928v2 [cond-mat.mes-hall] UPDATED)**

Jacob Pettine, Prashant Padmanabhan, Teng Shi, Lauren Gingras, Luke McClintock, Chun-Chieh Chang, Kevin W. C. Kwock, Long Yuan, Yue Huang, John Nogan, Jon K. Baldwin, Peter Adel, Ronald Holzwarth, Abul K. Azad, Filip Ronning, Antoinette J. Taylor, Rohit P. Prasankumar, Shi-Zeng Lin, Hou-Tong Chen

**Minimal model for the flat bands in copper-substituted lead phosphate apatite: Strong diamagnetism from multi-orbital physics. (arXiv:2308.01315v3 [cond-mat.supr-con] UPDATED)**

Omid Tavakol, Thomas Scaffidi

**Topological Floquet Flat Bands in Irradiated Alternating Twist Multilayer Graphene. (arXiv:2309.11685v2 [cond-mat.mes-hall] UPDATED)**

Yingyi Huang

**Gapped Phases with Non-Invertible Symmetries: (1+1)d. (arXiv:2310.03784v2 [hep-th] UPDATED)**

Lakshya Bhardwaj, Lea E. Bottini, Daniel Pajer, Sakura Schafer-Nameki

**Categorical Landau Paradigm for Gapped Phases. (arXiv:2310.03786v2 [cond-mat.str-el] UPDATED)**

Lakshya Bhardwaj, Lea E. Bottini, Daniel Pajer, Sakura Schafer-Nameki

**Turning non-magnetic two-dimensional molybdenum disulfide into room temperature magnets by the synergistic effect of strain engineering and charge injection. (arXiv:2310.03995v2 [cond-mat.mtrl-sci] UPDATED)**

Jing Wu, Ruyi Guo, Daoxiong Wu, Xiuling Li, Xiaojun Wu

**Superfluidity meets the solid-state: frictionless mass-transport through a (5,5) carbon-nanotube. (arXiv:2310.07476v2 [cond-mat.mtrl-sci] UPDATED)**

Alberto Ambrosetti, Pier Luigi Silvestrelli, Luca Salasnich

**Generation of isolated flat bands with tunable numbers through Moir\'e engineering. (arXiv:2310.07647v2 [cond-mat.mes-hall] UPDATED)**

Xiaoting Zhou, Yi-Chun Hung, Baokai Wang, Arun Bansil

**Mutual information and correlations across topological phase transitions in topologically ordered graphene zigzag nanoribbons. (arXiv:2310.08970v2 [cond-mat.mes-hall] UPDATED)**

In-Hwan Lee, Hoang-Anh Le, S.-R. Eric Yang

**Tunneling density of states of fractional quantum Hall edges: an unconventional bosonization approach. (arXiv:2310.10319v3 [cond-mat.mes-hall] UPDATED)**

Nikhil Danny Babu, Girish S. Setlur

**Entanglement-Embedded Recurrent Network Architecture: Tensorized Latent State Propagation and Chaos Forecasting. (arXiv:2006.14698v1 [math.NA] CROSS LISTED)**

Xiangyi Meng (Boston University), Tong Yang (Boston College)

Found 12 papers in prb With rapid progress, the current study of topological properties in condensed matter systems has been further extended from the electronic scope to the phononic perspective. Based on first-principles calculations, we present a systematic investigation on topological phononic states in a series of bi… Recent years have seen a number of instances where magnetism and superconductivity intrinsically coexist. Our focus is on the case where spin-triplet superconductivity arises out of ferromagnetism, and we make a hydrodynamic analysis of the effect of a charge supercurrent on magnetic topological def… Magnetic chains on superconductors hosting Majorana zero modes (MZMs) have attracted a great deal of interest due to their possible applications in fault-tolerant quantum computing. However, this is hindered by the lack of a detailed, quantitative understanding of these systems. As a significant ste… Recent advances in electron spin resonance techniques have allowed the manipulation of the spin of individual atoms, making magnetic atomic chains on superconducting hosts one of the most promising platform where topological superconductivity can be engineered. Motivated by this progress, we provide… Fragile and delicate topological phases of noninteracting fermions can be trivialized under addition of trivial bands, in contrast to strong topological phases. Here, the authors describe a classification procedure based on homotopy theory for topological insulators with a fixed number of bands. They thereby classify band structures symmetric under discrete rotations and time-reversal at the highest possible level of granularity and identify instances of “representation-protected stable topology”, which is robust to addition of trivial bands with a fixed orbital type. We propose a procedure that characterizes free-fermion or interacting classes of higher-order topological phases via their bulk entanglement structure. To this end, we construct Immersed in external magnetic fields $(B)$, buckled graphene constitutes an ideal tabletop setup, manifesting a confluence of time-reversal symmetry $(\mathcal{T})$ breaking Abelian $(B)$ and $\mathcal{T}$-preserving strain-induced internal axial $(b)$ magnetic fields. In such a system, here we nume… We numerically study the Seebeck and Nernst effects of pseudospin-1 fermions in the $α−{T}_{3}$ model under magnetic fields by combining the nonequilibrium Green's function and the Landauer-Büttiker formalism with the Stréda formula. In the $α=0$ limit under strong magnetic fields, our results are i… Recent experiments on nonmagnetic Weyl semimetals have seen separate bulk and surface superconductivity in Weyl semimetals, which raises the question of whether the surface Fermi arcs can support intrinsic superconductivity while the bulk stays in the normal state. A theoretical answer to this quest… We study the similarities and differences in the shift photocurrent contribution to the bulk photovoltaic effect between transition-metal dichalcogenide monolayers and nanotubes. Our analysis is based on density functional theory in combination with the Wannier interpolation technique for the calcul… A peculiar charge-density wave (CDW) phase, absent in the bulk, has been widely studied in monolayer $1T\text{−}{\mathrm{TiTe}}_{2}$ and newly observed in monolayer $1T\text{−}{\mathrm{ZrTe}}_{2}$, while its origin and physical properties remain unclear. Here, we study the distorted lattice and asso… Electrons on honeycomb or pi-flux lattices obey the effective massless Dirac equation at low energies and at the neutrality point, and should suffer quantum phase transitions into various Mott insulators and superconductors at strong two-body interactions. We show that 35 out of 36 such order parame…

Date of feed: Tue, 24 Oct 2023 03:17:01 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) **Cladded phononic nodal frame state in biatomic alkali-metal sulfides**

Tie Yang, Yang Gao, Liyu Hao, Haopeng Zhang, Xingwen Tan, Peng Wang, Zhenxiang Cheng, and Weikang Wu

Author(s): Tie Yang, Yang Gao, Liyu Hao, Haopeng Zhang, Xingwen Tan, Peng Wang, Zhenxiang Cheng, and Weikang Wu

[Phys. Rev. B 108, 134310] Published Mon Oct 23, 2023

**Current-driven motion of magnetic topological defects in ferromagnetic superconductors**

Se Kwon Kim and Suk Bum Chung

Author(s): Se Kwon Kim and Suk Bum Chung

[Phys. Rev. B 108, 134509] Published Mon Oct 23, 2023

**Topological superconductivity from first principles. I. Shiba band structure and topological edge states of artificial spin chains**

Bendegúz Nyári, András Lászlóffy, Gábor Csire, László Szunyogh, and Balázs Újfalussy

Author(s): Bendegúz Nyári, András Lászlóffy, Gábor Csire, László Szunyogh, and Balázs Újfalussy

[Phys. Rev. B 108, 134512] Published Mon Oct 23, 2023

**Topological superconductivity from first principles. II. Effects from manipulation of spin spirals: Topological fragmentation, braiding, and quasi-Majorana bound states**

András Lászlóffy, Bendegúz Nyári, Gábor Csire, László Szunyogh, and Balázs Újfalussy

Author(s): András Lászlóffy, Bendegúz Nyári, Gábor Csire, László Szunyogh, and Balázs Újfalussy

[Phys. Rev. B 108, 134513] Published Mon Oct 23, 2023

**Homotopic classification of band structures: Stable, fragile, delicate, and stable representation-protected topology**

Piet W. Brouwer and Vatsal Dwivedi

Author(s): Piet W. Brouwer and Vatsal Dwivedi

[Phys. Rev. B 108, 155137] Published Mon Oct 23, 2023

**Entanglement signatures of multipolar higher-order topological phases**

Oleg Dubinkin and Taylor L. Hughes

Author(s): Oleg Dubinkin and Taylor L. Hughes*nested* entanglement Hamiltonians by first applying an entanglement cut to the ordinary many-body ground state, and then it…

[Phys. Rev. B 108, 155138] Published Mon Oct 23, 2023

**Transport in strained graphene: Interplay of Abelian and axial magnetic fields**

Aqeel Ahmed, Sanjib Kumar Das, and Bitan Roy

Author(s): Aqeel Ahmed, Sanjib Kumar Das, and Bitan Roy

[Phys. Rev. B 108, 155426] Published Mon Oct 23, 2023

**Seebeck and Nernst effects of pseudospin-1 fermions in the $α−{T}_{3}$ model under magnetic fields**

Wenye Duan

Author(s): Wenye Duan

[Phys. Rev. B 108, 155428] Published Mon Oct 23, 2023

**Intrinsic surface superconducting instability in type-I Weyl semimetals**

Aymen Nomani and Pavan Hosur

Author(s): Aymen Nomani and Pavan Hosur

[Phys. Rev. B 108, 165144] Published Mon Oct 23, 2023

**Understanding the large shift photocurrent of ${\mathrm{WS}}_{2}$ nanotubes: A comparative analysis with monolayers**

Jyoti Krishna, Peio Garcia-Goiricelaya, Fernando de Juan, and Julen Ibañez-Azpiroz

Author(s): Jyoti Krishna, Peio Garcia-Goiricelaya, Fernando de Juan, and Julen Ibañez-Azpiroz

[Phys. Rev. B 108, 165418] Published Mon Oct 23, 2023

**Emergent charge density wave order in the monolayer limit of $1T\text{−}{\mathrm{TiTe}}_{2}$ and $1T\text{−}{\mathrm{ZrTe}}_{2}$**

Jiayuan Zhang, Fei Wang, and Chao-Sheng Lian

Author(s): Jiayuan Zhang, Fei Wang, and Chao-Sheng Lian

[Phys. Rev. B 108, 165421] Published Mon Oct 23, 2023

**$SO(8)$ unification and the large-$N$ theory of superconductor-insulator transition of two-dimensional Dirac fermions**

Igor F. Herbut and Subrata Mandal

Author(s): Igor F. Herbut and Subrata Mandal

[Phys. Rev. B 108, L161108] Published Mon Oct 23, 2023

Found 2 papers in prl Coating thermal noise is one of the dominant noise sources in current gravitational wave detectors and ultimately limits their ability to observe weaker or more distant astronomical sources. This Letter presents investigations of ${\mathrm{TiO}}_{2}$ mixed with ${\mathrm{SiO}}_{2}$ (${\mathrm{TiO}}_… The theory of topological phases of matter predicts invariants protected only by crystalline symmetry, yet it has been unclear how to extract these from microscopic calculations in general. Here, we show how to extract a set of many-body invariants ${{\mathrm{Θ}}_{o}^{±}}$, where $o$ is a high symme…

Date of feed: Tue, 24 Oct 2023 03:16:59 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) **Titania Mixed with Silica: A Low Thermal-Noise Coating Material for Gravitational-Wave Detectors**

Graeme I. McGhee, Viola Spagnuolo, Nicholas Demos, Simon C. Tait, Peter G. Murray, Martin Chicoine, Paul Dabadie, Slawek Gras, Jim Hough, Guido Alex Iandolo, Ross Johnston, Valérie Martinez, Oli Patane, Sheila Rowan, François Schiettekatte, Joshua R. Smith, Lukas Terkowski, Liyuan Zhang, Matthew Evans, Iain W. Martin, and Jessica Steinlechner

Author(s): Graeme I. McGhee, Viola Spagnuolo, Nicholas Demos, Simon C. Tait, Peter G. Murray, Martin Chicoine, Paul Dabadie, Slawek Gras, Jim Hough, Guido Alex Iandolo, Ross Johnston, Valérie Martinez, Oli Patane, Sheila Rowan, François Schiettekatte, Joshua R. Smith, Lukas Terkowski, Liyuan Zhang, Matthew Evans, Iain W. Martin, and Jessica Steinlechner

[Phys. Rev. Lett. 131, 171401] Published Mon Oct 23, 2023

**Complete Crystalline Topological Invariants from Partial Rotations in $(2+1)\mathrm{D}$ Invertible Fermionic States and Hofstadter’s Butterfly**

Yuxuan Zhang, Naren Manjunath, Ryohei Kobayashi, and Maissam Barkeshli

Author(s): Yuxuan Zhang, Naren Manjunath, Ryohei Kobayashi, and Maissam Barkeshli

[Phys. Rev. Lett. 131, 176501] Published Mon Oct 23, 2023

Found 2 papers in pr_res Skyrmions are topological solitons in two-dimensional systems and have been observed in various physical systems. Generating and controlling skyrmions in artificial resonator arrays lead to novel acoustic, photonic, and electric devices, but it is a challenge to implement a vector variable with the … Quantum phase transitions between different topologically ordered phases exhibit rich structures and are generically challenging to study in microscopic lattice models. In this paper, we propose a tensor-network solvable model that allows us to tune between different symmetry enriched topological (S…

Date of feed: Tue, 24 Oct 2023 03:17:00 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) **Quadrature skyrmions in two-dimensionally arrayed parametric resonators**

Hiroshi Yamaguchi, Daiki Hatanaka, and Motoki Asano

Author(s): Hiroshi Yamaguchi, Daiki Hatanaka, and Motoki Asano

[Phys. Rev. Research 5, 043076] Published Mon Oct 23, 2023

**Quantum phase transition between symmetry enriched topological phases in tensor-network states**

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

Author(s): Lukas Haller, Wen-Tao Xu, Yu-Jie Liu, and Frank Pollmann

[Phys. Rev. Research 5, 043078] Published Mon Oct 23, 2023