Found 58 papers in cond-mat Turbulent flows are observed in low-Reynolds active fluids. They are
intrinsically different from the classical inertial turbulence and behave
distinctively in two- and three-dimensions. Understanding the behaviors of this
new type of turbulence and their dependence on the system dimensionality is a
fundamental challenge in non-equilibrium physics. We experimentally measure
flow structures and energy spectra of bacterial turbulence between two large
parallel plates spaced by different heights $H$. The turbulence exhibits three
regimes as H increases, resulting from the competition of bacterial length,
vortex size and H. This is marked by two critical heights ($H_0$ and $H_1$) and
a $H^{0.5}$ scaling law of vortex size in the large-$H$ limit. Meanwhile, the
spectra display distinct universal scaling laws in quasi-two-dimensional (2D)
and three-dimensional (3D) regimes, independent of bacterial activity, length
and $H$, whereas scaling exponents exhibit transitions in the crossover. To
understand the scaling laws, we develop a hydrodynamic model using image
systems to represent the effect of no-slip confining boundaries. This model
predicts universal 1 and -4 scaling on large and small length scales,
respectively, and -2 and -1 on intermediate length scales in 2D and 3D,
respectively, which are consistent with the experimental results. Our study
suggests a framework for investigating the effect of dimensionality on
non-equilibrium self-organized systems.
We present a device architecture of hybrid-edge and dual-gated quantum point
contact. We demonstrate improved electrostatic control over the separation,
position, and coupling of each broken-symmetry compressible strip in graphene.
Via low-temperature magneto-transport measurement, we demonstrate selective
manipulation over the evolution, hybridization, and transmission of arbitrarily
chosen quantum Hall states in the channel. With gate-tunable tunneling
spectroscopy, we characterize the energy gap of each symmetry-broken quantum
Hall state with high resolution on the order of ~0.1 meV.
Magnetic skyrmions and antiskyrmions are topologically protected
quasiparticles exhibiting a whirling spin texture in real space. Antiskyrmions
offer some advantages over skyrmions as they are expected to have higher
stability and can be electrically driven with no transverse motion. However,
unlike the widely investigated skyrmions, antiskyrmions are rarely observed due
to the required anisotropic Dzyaloshinskii-Moriya interaction (DMI). Here we
propose to exploit the recently demonstrated van der Waals (vdW) assembly of
two-dimensional (2D) materials that breaks inversion symmetry and creates
conditions for anisotropic DMI. Using a 2D vdW magnet CrI${}_3$ as an example,
we demonstrate, based on density functional theory (DFT) calculations, that
this strategy is a promising platform to realize antiskyrmions. Polar layer
stacking of two centrosymmetric magnetic monolayers of CrI${}_3$ efficiently
lowers the symmetry, resulting in anisotropic DMI that supports antiskyrmions.
The DMI is reversible by switching the ferroelectric polarization inherited
from the polar layer stacking, offering the control of antiskyrmions by an
electric field. Furthermore, we find that the magnetocrystalline anisotropy and
DMI of CrI${}_3$ can be efficiently modulated by Mn doping, creating a
possibility to control the size of antiskyrmions. Using atomistic spin dynamics
simulations with the parameters obtained from our DFT calculations, we predict
the formation of antiskyrmions in a Cr${}_{0.88}$Mn${}_{0.12}$I${}_3$ bilayer
and switching their spin texture with polarization reversal. Our results open a
new direction to generate and control magnetic antiskyrmions in 2D vdW magnetic
systems.
Superconducting (SC) state has spin and orbital degrees of freedom, and
spin-triplet superconductivity shows multiple SC phases due to the presence of
these degrees of freedom. However, the observation of spin-direction rotation
occurring inside the SC state (SC spin rotation) has hardly been reported.
UTe2, a recently discovered topological superconductor, exhibits various SC
phases under pressure: SC state at ambient pressure (SC1), high-temperature SC
state above 0.5 GPa (SC2), and low-temperature SC state above 0.5 GPa (SC3). We
performed nuclear magnetic resonance and AC susceptibility measurements on
single-crystal UTe2. The b-axis spin susceptibility remains unchanged in SC2,
unlike in SC1, and decreases below the SC2-SC3 transition with spin modulation.
These unique properties in SC3 arise from the coexistence of two SC order
parameters. Our NMR results confirm the spin-triplet superconductivity with SC
spin parallel to b in SC2, and unveil the remaining of spin degrees of freedom
in superconducting UTe2.
We report a study of selenospinel Cu$_{6-x}$Fe$_{4+x}$Sn$_{12}$Se$_{32}$ ($x$
= 0, 1, 2) single crystals, which crystalize in a cubic structure with the
$Fd\overline{3}m$ space group, and show typical semiconducting behavior. The
large discrepancy between the activation energy for electrical conductivity
$E_\rho$ (32.3 $\sim$ 69.8 meV), and for thermopower $E_\textrm{S}$ (3.2 $\sim$
11.5 meV), indicates a polaronic transport mechanism between 350 and 50 K. With
decreasing temperature, it evolves into variable-range hopping conduction.
Furthermore, the heat capacity shows a hump around 25(5) K and diverges from
the Debye $T^3$ law at low temperatures, indicating the observation of
structural glassy features in these crystalline solids.
In this comment, we show that the model introduced in Hess et al. Phys. Rev.
Lett. {\bf 130}, 207001 (2023) fails the topological gap protocol (TGP)
(Pikulin et al., arXiv:2103.12217 and M. Aghaee et al., Phys. Rev. B 107,
245424 (2023)). In addition, we discuss this model in the broader context of
how the TGP has been benchmarked.
Systems with flat bands are ideal for studying strongly correlated electronic
states and related phenomena. Among them, kagome-structured metals such as CoSn
have been recognized as promising candidates due to the proximity between the
flat bands and the Fermi level. A key next step will be to realize epitaxial
kagome thin films with flat bands to enable tuning of the flat bands across the
Fermi level via electrostatic gating or strain. Here we report the band
structures of epitaxial CoSn thin films grown directly on insulating
substrates. Flat bands are observed using synchrotron-based angle-resolved
photoemission spectroscopy (ARPES). The band structure is consistent with
density functional theory (DFT) calculations, and the transport properties are
quantitatively explained by the band structure and semiclassical transport
theory. Our work paves the way to realize flat band-induced phenomena through
fine-tuning of flat bands in kagome materials.
While Landau's Fermi liquid theory provides the standard description for two-
and three-dimensional (2D/3D) conductors, the physics of interacting
one-dimensional (1D) conductors is governed by the distinct Luttinger liquid
(LL) theory. Can a LL-like state, in which electronic excitations are
fractionalized modes, emerge in a 2D system as a stable zero-temperature phase?
This long-standing question, first brought up by Anderson decades ago, is
crucial in the study of non-Fermi liquids but remains unsettled. A recent
experiment identified a moir\'e superlattice of twisted bilayer tungsten
ditelluride (tWTe_2) with a small interlayer twist angle as a 2D host of the LL
physics at temperatures of a few kelvins. Here we report experimental evidence
for a 2D anisotropic LL state in a substantially reduced temperature regime,
down to at least 50 mK, spontaneously formed in a tWTe_2 system with a twist
angle of ~ 3 degree. While the system is metallic-like and nearly isotropic
above 2 K, a dramatically enhanced electronic anisotropy develops in the
millikelvin regime, featuring distinct transport behaviors along two orthogonal
in-plane directions. In the strongly anisotropic phase, we observe transport
characteristics of a 2D LL phase, i.e., the universal power law scaling
behaviors in across-wire conductance and a zero-bias dip in the differential
resistance along the wire direction. Our results represent a step forward in
the search for stable LL physics beyond 1D and related unconventional quantum
matter.
Considering low-energy model of tilted Weyl semimetal, we study the
electronic transmission through a periodically driven quantum well, oriented in
the transverse direction with respect to the tilt. We adopt the formalism of
Floquet scattering theory and investigate the emergence of Fano resonances as
an outcome of matching between the Floquet sidebands and quasi-bound states.
The Fano resonance energy changes linearly with the tilt strength suggesting
the fact that tilt-mediated part of quasi-bound states energies depends on the
above factor. Given a value of momentum parallel (perpendicular) to the tilt,
we find that the energy gap between two Fano resonances, appearing for two
adjacent values of transverse (collinear) momentum with respect to the tilt
direction, is insensitive (sensitive) to the change in the tilt strength. Such
a coupled (decoupled) behavior of tilt strength and the collinear (transverse)
momentum can be understood from the tilt-mediated and normal parts of the
quasi-bound state energies inside the potential well. We vary the other tilt
parameters and chirality of the Weyl points to conclusively verify exact form
of the tilt-mediated part of the quasi-bound state energy that is the same as
the tilt term in the static dispersion. Our work paves the way to probe the
tilt-mediated part of quasi-bound state energy for understanding the complex
interplay between the tilt and Fano resonance.
Scattering kinetics influence the graphene transport properties and inhibits
the charge carrier deterministic behaviour. The intra or inter-band scattering
mechanisms are vital for graphenes optical conductivity response under specific
considerations of doping. Here, we investigated the influence of scattering
systematically on optical conductivity using the multiband semi-classical
Boltzmann equation with inclusion of both electron-electron $\&$
electron-phonon collisions. We found unconventional characteristics of linear
optical response with a significant deviation from the universal conductivity
$\frac{e$^2$}{2$\hbar$}$ in doped monolayer graphene. This is examined through
phenomenological relaxation rates under low doping regimes and found that the
dominance of intraband scattering. Such novel optical responses are vanished at
high temperatures or overdoping conditions due to strong Drude behaviour. With
the aid of approximations around Dirac points we have developed formalism for
many body interactions and found which is in good agreement with the Kubo
approaches.
Based on our first detailed $^{181}$Ta nuclear quadrupole resonance (NQR)
studies from 2017 on the Weyl semimetal TaP, we now extended our NQR studies to
another Ta-based monopnictide TaAs. In the present work, we have determined the
temperature-dependent $^{181}$Ta-NQR spectra, the spin-lattice relaxation time
$T_{1}$, and the spin-spin relaxation time $T_{2}$. We found the following
characteristic features that showed great contrast to what was found in TaP:
(1) The quadrupole coupling constant and asymmetry parameter of EFG, extracted
from three NQR frequencies, have a strong temperature dependence above $\sim$80
K that cannot be explained by the density functional theory calculation
incorporating the thermal expansion of the lattice. (2) The temperature
dependence of the spin-lattice relaxation rate, $1/T_{1} T$, shows a $T^{4}$
power law behavior above $\sim$30 K. This is a great contrast with the $1/T_{1}
T \propto T^{2}$ behavior found in TaP, which was ascribed to the magnetic
excitations at the Weyl nodes with a temperature-dependent orbital hyperfine
coupling. (3) Regarding the nuclear spin-spin interaction, we found the
spin-echo signal decays with the pulse separation simply by a Lorentzian
function in TaAs, but we have observed spin-echo modulations in TaP that is
most likely due to the indirect nuclear spin-spin coupling via virtually
excited Weyl fermions. From our experimental findings, we conclude that the
present NQR results do not show dominant contributions from Weyl fermion
excitations in TaAs.
Ex-so-tic van der Waals heterostructures take advantage of the electrically
tunable layer polarization to swap proximity exchange and spin-orbit coupling
in the electronically active region. Perhaps the simplest example is Bernal
bilayer graphene (BBG) encapsulated by a layered magnet from one side and a
strong spin-orbit material from the other. Taking WS$_2$/BBG/Cr$_2$Ge$_2$Te$_6$
as a representative ex-so-tronic device, we employ realistic \emph{ab
initio}-inspired Hamiltonians and effective electron-electron interactions to
investigate the emergence of correlated phases within the random phase
approximation. We find that for a given doping level, exchange and spin-orbit
coupling induced Stoner and intervalley coherence instabilities can be swapped,
allowing to explore the full spectrum of correlated phases within a single
device.
We employ N-$V$ magnetometry to measure the stray field dynamics of a
ferromagnetic permalloy nanowire driven by spin-orbit torques. Specifically, we
observe the optically detected magnetic resonance (ODMR) signatures of both
spontaneous DC-driven magnetic oscillations and phase-locking to a second
harmonic drive, developing a simple macrospin model that captures the salient
features. We also observe signatures of dynamics beyond the macrospin model,
including an additional ODMR feature (associated with a second SW mode) and one
mode sapping power from another. Our results provide additional insight into
N-$V$-spin wave coupling mechanisms, and represent a new modality for
sub-wavelength N-$V$ scanned probe microscopy of nanoscale magnetic
oscillators.
We analyze the influence of disorder and strong correlations on the topology
in two dimensional Chern insulators. A mean field calculation in the
half-filled Haldane model with extended Hubbard interactions and Anderson
disorder shows that disorder favors topology in the interacting case and
extends the topological phase to a larger region of the Hubbard parameters. In
the absence of a staggered potential, we find a novel disorder-driven
topological phase with Chern number C=1, with co-existence of topology with
long range spin and charge orders. More conventional topological Anderson
insulating phases are also found in the presence of a finite staggered
potential.
Population Annealing, the currently state-of-the-art algorithm for solving
spin-glass systems, sometimes finds hard disorder instances for which its
equilibration quality at each temperature step is severely damaged. In such
cases one can therefore not be sure about having reached the true ground state
without vastly increasing the computational resources. In this work we overcome
this problem by proposing a quantum-inspired modification of Population
Annealing. Here we focus on three-dimensional random plaquette gauge model
which ground state energy problem seems to be much harder to solve than
standard spin-glass Edwards-Anderson model. In analogy to the Toric Code, by
allowing single bond flips we let the system explore non-physical states,
effectively expanding the configurational space by the introduction of
topological defects that are then annealed through an additional field
parameter. The dynamics of these defects allow for the effective realization of
non-local cluster moves, potentially easing the equilibration process. We study
the performance of this new method in three-dimensional random plaquette gauge
model lattices of various sizes and compare it against Population Annealing.
With that we conclude that the newly introduced non-local moves are able to
improve the equilibration of the lattices, in some cases being superior to a
normal Population Annealing algorithm with a sixteen times higher computational
resource investment.
The coexistence of multiple structural phases and field induced short-range
to long-range order transition in ferroelectric materials, leads to a strong
electrocaloric effect (ECE) and electrical energy storage density (Wrec) in the
vicinity of ferroelectric to non-ergodic phase transition in NKBT ceramic.
Structural analysis using X-ray diffraction, Raman spectroscopy and TEM studies
ascertained the coexistence of tetragonal (P4mm) and rhombohedral (R3c) phases.
Dielectric study has revealed a critical slowing down of polar domain dynamics
below a diffuse phase transition. Present investigation reports ECE in
lead-free (Na0.8K0.2)0.5Bi0.5TiO3 (NKBT) ceramic by direct and indirect
methods, which confirm the multifunctional nature of NKBT and its usefulness
for applications in refrigeration and energy storage. A direct method of EC
measurement in NKBT ceramic exhibits significant adiabatic temperature change
({\Delta}T) ~ 1.10 K and electrocaloric strength ({\xi}) ~ 0.55 Kmm/kV near the
ferroelectric to non-ergodic phase transition at an external applied field of
20 kV/cm. A highest recoverable energy (Wrec) ~ 0.78 J/cm3 and electrical
storage efficiency ({\eta}) ~ 86% are achieved at 423 K and an applied field of
20 kV/cm. This behavior is ascribed to the delicate balance between the field
induced order-disordered transition and the thermal energy needed to disrupt
field induced co-operative interaction.
Topology is now securely established as a means to explore and classify
electronic states in crystalline solids. This review provides a gentle but firm
introduction to topological electronic band structure suitable for new
researchers in the field. I begin by outlining the relevant concepts from
topology, then give a summary of the theory of non-interacting electrons in
periodic potentials. Next, I explain the concepts of the Berry phase and Berry
curvature, and derive key formulae. The remainder of the article deals with how
these ideas are applied to classify crystalline solids according to the
topology of the electronic states, and the implications for observable
properties. Among the topics covered are the role of symmetry in determining
band degeneracies in momentum space, the Chern number and Z2 topological
invariants, surface electronic states, two- and three-dimensional topological
insulators, and Weyl and Dirac semimetals
We demonstrate optical reflectivity and Raman responses of graphite
microstructures as a function of light polarization when the incident light is
applied perpendicular to the material's stacking direction (c-axis). For this,
we employed novel graphite nanoribbons with edges polished through ion-beam
etching. In this unique configuration, a strong polarization dependence of the
D, G, and 2D Raman modes is observed. At the same time, polarized reflectivity
measurements demonstrate the potential of such a device as a carbon-based,
on-chip polarizer. We discuss the advantages of the proposed fabrication method
as opposed to the mechanical polishing of bulk crystals.
Carbon nanoribbon or nanographene qubit arrays can facilitate
quantum-to-quantum transduction between light, charge, and spin, making them an
excellent testbed for fundamental science in quantum coherent systems and for
the construction of higher-level qubit circuits. In this work, we study spin
decoherence due to coupling with a surrounding nuclear spin bath of an
electronic molecular spin of a vanadyl phthalocyanine (VOPc) molecule
integrated on an armchair-edged graphene nanoribbon (GNR). Density functional
theory (DFT) is used to obtain ground state atomic configurations. Decay of
spin coherence in Hahn echo experiments is then simulated using the cluster
correlation expansion method with a spin Hamiltonian involving hyperfine and
electric field gradient tensors calculated from DFT. We find that the
decoherence time $T_2$ is anisotropic with respect to magnetic field
orientation and determined only by the hydrogen nuclear spins both on VOPc and
GNR. Large electron spin echo envelope modulation (ESEEM) due to nitrogen and
vanadium nuclear spins is present at specific field ranges and can be
completely suppressed by tuning the magnetic field. The relation between these
field ranges and the hyperfine interactions is analyzed. The effects of
interactions with the nuclear quadrupole moments are also studied, validating
the applicability and limitations of the spin Hamiltonian when they are
disregarded.
Control and detection of antiferromagnetic topological materials are
challenging since the total magnetization vanishes. Here we investigate the
magneto-optical Kerr and Faraday effects in bilayer antiferromagnetic insulator
MnBi$_2$Te$_4$. We find that by breaking the combined mirror symmetries with
either perpendicular electric field or external magnetic moment, Kerr and
Faraday effects occur. Under perpendicular electric field, antiferromagnetic
topological insulators (AFMTI) show sharp peaks at the interband transition
threshold, whereas trivial insulators show small adjacent positive and negative
peaks. Gate voltage and Fermi energy can be tuned to reveal the differences
between AFMTI and trivial insulators. We find that AFMTI with large
antiferromagnetic order can be proposed as a pure magneto-optical rotator due
to sizable Kerr (Faraday) angles and vanishing ellipticity. Under external
magnetic moment, AFMTI and trivial insulators are significantly different in
the magnitude of Kerr and Faraday angles and ellipticity. For the qualitative
behaviors, AFMTI shows distinct features of Kerr and Faraday angles when the
spin configurations of the system change. These phenomena provide new
possibilities to optically detect and manipulate the layered topological
antiferromagnets.
We present a symmetrization routine that optimizes and eases the analysis of
data featuring the anomalous Hall effect. This technique can be transferred to
any hysteresis with (point-)symmetric behaviour. The implementation of the
method is demonstrated exemplarily using intermixed longitudinal and
transversal data obtained from a chromium-doped ternary topological insulator
revealing a clear hysteresis. Furthermore, by introducing a mathematical
description of the anomalous Hall hysteresis based on the error function
precise values of the height and coercive field are determined.
The investigation of twist engineering in easy-axis magnetic systems has
revealed the remarkable potential for generating topological spin textures,
such as magnetic skyrmions. Here, by implementing twist engineering in
easy-plane magnets, we introduce a novel approach to achieve fractional
topological spin textures such as merons. Through atomistic spin simulations on
twisted bilayer magnets, we demonstrate the formation of a stable double meron
pair in two magnetic layers, which we refer to as the "Meron Quartet" (MQ).
Unlike merons in a single pair, which is unstable against pair annihilation,
the merons within the MQ exhibit exceptional stability against pair
annihilation due to the protective localization mechanism induced by the twist
that prevents the collision of the meron cores. Furthermore, we showcase that
the stability of the MQ can be enhanced by adjusting the twist angle, resulting
in increased resistance to external perturbations such as external magnetic
fields. Our findings highlight the twisted magnet as a promising platform for
investigating the intriguing properties of merons, enabling their realization
as stable magnetic quasiparticles in van der Waals magnets.
In isolated nonlinear optical waveguide arrays with bounded energy spectrum,
simultaneous conservation of energy and power of the optical modes enables
study of coupled thermal and particle transport in the negative temperature
regime. Here, based on exact numerical simulation and rationale from Landauer
formalism, we predict generic violation of the Wiedemann-Franz law in such
systems. This is rooted in the spectral decoupling of thermal and power current
of optical modes, and their different temperature dependence. Our work extends
the study of coupled thermal and particle transport into unprecedented regimes,
not reachable in natural condensed matter and atomic gas systems.
Realizing quantum phases of electrons with high critical temperatures (Tc)
has been one of the most important goals in quantum materials research, as
exemplified by the longstanding and sometimes contentious quest for high Tc
superconductors. Recently, 2D moir\'e materials have emerged as the most
versatile platform for the realization of a broad range of quantum phases.
These quantum phases are commonly observed at cryogenic temperatures, but a few
of them exhibit sufficiently high Tc, e.g., ~ 150 K for Mott insulator states
in transition metal dichalcogenide (TMD) moir\'e interfaces. Here, we explore
the origins of the stability of correlated states in WSe2/WS2 moir\'e
superlattices by measuring the time scales of melting and their temperature
dependences. Using exciton sensing and pump-probe reflectance spectroscopy, we
find that ultrafast electronic excitation leads to melting of the Mott states
on a time scale of 3.3 ps (at T = 11 K), which is approximately five times
longer than that predicted from the charge hopping integral between moir\'e
unit cells. We further find that the melting rates are thermally activated,
with activation energies of Ea = 18 meV and 13 meV for the correlated states
with one and two holes (v = -1 and -2) per moir\'e unit cell, respectively,
suggesting significant electron-phonon coupling. The overall temperature
dependences in the exciton oscillator strength, a proxy to the order parameter
for the correlated states, gives estimates of Tc in agreement with the
extracted Ea. Density functional theory (DFT) calculations on the moir\'e scale
confirm polaron formation in the v = -1 Mott state and predict a hole polaron
binding energy of 16 meV, in agreement with experiment. These findings suggest
a close interplay of electron-electron and electron-phonon interactions in the
formation of polaronic Mott insulators at TMD moir\'e interfaces.
Graphene nanoribbons (GNRs) exhibit a broad range of physicochemical
properties that critically depend on their width and edge topology. While the
chemically stable GNRs with armchair edges (AGNRs) are semiconductors with
width-tunable band gap, GNRs with zigzag edges (ZGNRs) host spin-polarized edge
states, which renders them interesting for applications in spintronic and
quantum technologies. However, these states significantly increase their
reactivity. For GNRs fabricated via on-surface synthesis under ultrahigh vacuum
conditions on metal substrates, the expected reactivity of zigzag edges is a
serious concern in view of substrate transfer and device integration under
ambient conditions, but corresponding investigations are scarce. Using
10-bromo-9,9':10',9''-teranthracene as a precursor, we have thus synthesized
hexanthene (HA) and teranthene (TA) as model compounds for ultrashort GNRs with
mixed armchair and zigzag edges, characterized their chemical and electronic
structure by means of scanning probe methods, and studied their chemical
reactivity upon air exposure by Raman spectroscopy. We present a detailed
identification of molecular orbitals and vibrational modes, assign their origin
to armchair or zigzag edges, and discuss the chemical reactivity of these edges
based on characteristic Raman spectral features.
Two-dimensional (2D) transition metal dichalcogenides (TMDs) hold great
potential for future low-energy optoelectronics owing to their unique
electronic, optical, and mechanical properties. Chemical vapor deposition (CVD)
is the technique widely used for the synthesis of large-area TMDs. However, due
to high sensitivity to the growth environment, reliable synthesis of monolayer
TMDs via CVD remains challenging. Here we develop a controllable CVD process
for large-area synthesis of monolayer WS2 crystals, films, and in-plane
graphene-WS2 heterostructures by cleaning the reaction tube with hydrochloric
acid, sulfuric acid and aqua regia. The concise cleaning process can remove the
residual contaminates attached to the CVD reaction tube and crucibles, reducing
the nucleation density but enhancing the diffusion length of WS2 species. The
photoluminescence (PL) mappings of a WS2 single crystal and film reveal that
the extraordinary PL around the edges of a triangular single crystal is induced
by ambient water intercalation at the WS2-sapphire interface. The extraordinary
PL can be controlled by the choice of substrates with different wettabilities.
Bacterial biofilms mechanically behave as viscoelastic media consisting of
micron-sized bacteria crosslinked to a selfproduced network of extracellular
polymeric substances (EPS) embedded in water. Structural principles for
numerical modelling aim at describing mesoscopic viscoelasticity without
loosing detail on the underlying interactions existing in wide regimes of
deformation under hydrodynamic stress. Here we approach the computational
challenge to model bacterial biofilms for predictive mechanics in silico under
variable stress conditions. Up-to-date models are not entirely satisfactory due
to the plethora of parameters required to make them functioning under the
effects of stress. As guided by the structural depiction gained in a previous
work with Pseudomonas fluorescens (Jara et al. Front. Microbiol. (2021)), we
propose a mechanical modeling by means of Dissipative Particle Dynamics (DPD),
which captures the essentials of the topological and compositional interactions
between bacteria particles and crosslinked EPS-embedding under imposed shear.
The P. fluorescens biofilms have been modeled under mechanical stress mimicking
shear stresses as undergone in vitro. The predictive capacity for mechanical
features in DPD-simulated biofilms has been investigated by varying the
externally imposed field of shear strain at variable amplitude and frequency.
The parametric map of essential biofilm ingredients has been explored by making
the rheological responses to emerge among conservative mesoscopic interactions
and frictional dissipation in the underlying microscale. The proposed coarse
grained DPD simulation qualitatively catches the rheology of the P. fluorescens
biofilm over several decades of dynamic scaling.
Measuring NT-proBNP biomarker is recommended for preliminary diagnostics of
the heart failure. Recent studies suggest a possibility of early screening of
biomarkers in saliva for non-invasive identification of cardiac diseases at the
point-of-care. However, NT-proBNP concentrations in saliva can be thousand
times lower than in blood plasma, going down to pg/mL level. To reach this
level, we developed a label-free aptasensor based on a liquid-gated field
effect transistor using a film of reduced graphene oxide monolayer (rGO-FET)
with immobilized NT-proBNP specific aptamer. We found that, depending on ionic
strength of tested solutions, there were different levels of correlation in
responses of electrical parameters of the rGO-FET aptasensor, namely, the Dirac
point shift and transconductance change. The correlation in response to
NT-proBNP was high for 1.6 mM phosphate-buffered saline (PBS) and zero for 16
mM PBS in a wide range of analyte concentrations, varied from 1 fg/mL to 10
ng/mL. The effect in transconductance and Dirac point shift in PBS solutions of
different concentrations are discussed. The biosensor exhibited a high
sensitivity for both transconductance (2*10E-6 S/decade) and Dirac point shift
(2.3 mV/decade) in diluted PBS with the linear range from 10 fg/ml to 1 pg/ml.
The aptasensor performance has been also demonstrated in undiluted artificial
saliva with the achieved limit of detection down to 41 fg/mL (~4.6 fM).
Motivated by the recent discovery of superconductivity in La$_3$Ni$_2$O$_7$
under pressure, we discuss the basic ingredients of a model that captures the
evolution of pressure tuning. In particular, we study the effects of electron
correlations of a bilayer Hubbard model including the Ni $3d$ $x^2-y^2$ and
$z^2$ orbitals. By performing the calculation in the bonding-antibonding
molecular orbital basis, we show the ground state of the model crosses over
from a low-spin $S=1/2$ state to a high-spin $S=3/2$ state. In the high-spin
state, the two $x^2-y^2$ and the bonding $z^2$ orbitals are all close to
half-filling. It promotes an orbital-selective Mott phase where the $x^2-y^2$
orbitals are Mott localized while the $z^2$ orbitals are renormalized but
remaining itinernant. Strong orbital selectivity is shown to exist in a broad
crossover regime of the phase diagram. Based on these results, we construct an
effective multiorbital $t$-$J$ model to describe the superconductivity of the
system, and find the leading pairing channel to be an intraorbital spin singlet
with a competition between the extended $s$-wave and $d_{x^2-y^2}$ symmetries.
Our results highlight the role of strong multiorbital correlation effects in
driving the superconductivity of La$_3$Ni$_2$O$_7$.
Photonic and bosonic systems subject to incoherent, wide-bandwidth driving
cannot typically reach stable finite-density phases using only non-dissipative
Hamiltonian nonlinearities; one instead needs nonlinear losses, or a finite
pump bandwidth. We describe here a very general mechanism for circumventing
this common limit, whereby Hamiltonian interactions can cut-off heating from a
Markovian pump, by effectively breaking a symmetry of the unstable, linearized
dynamics. We analyze two concrete examples of this mechanism. The first is a
new kind of $\mathcal{PT}$ laser, where Hermitian Hamiltonian interactions can
move the dynamics between the $\mathcal{PT}$ broken and unbroken phases and
thus induce stability. The second uses onsite Kerr or Hubbard type interactions
to break the chiral symmetry in a topological photonic lattice, inducing exotic
phenomena from topological lasing to the stabilization of Fock states in a
topologically protected edge mode.
As first demonstrated by the characterization of the quantum Hall effect by
the Chern number, topology provides a guiding principle to realize robust
properties of condensed matter systems immune to the existence of disorder. The
bulk-boundary correspondence guarantees the emergence of gapless boundary modes
in a topological system whose bulk exhibits nonzero topological invariants.
Although some recent studies have suggested a possible extension of the notion
of topology to nonlinear systems such as photonics and electrical circuits, the
nonlinear counterpart of topological invariant has not yet been understood.
Here, we propose the nonlinear extension of the Chern number based on the
nonlinear eigenvalue problems in two-dimensional systems and reveal the
bulk-boundary correspondence beyond the weakly nonlinear regime. Specifically,
we find the nonlinearity-induced topological phase transitions, where the
existence of topological edge modes depends on the amplitude of oscillatory
modes. We propose and analyze a minimal model of a nonlinear Chern insulator
whose exact bulk solutions are analytically obtained and indicate the amplitude
dependence of the nonlinear Chern number, for which we confirm the nonlinear
counterpart of the bulk-boundary correspondence in the continuum limit. Thus,
our result reveals the existence of genuinely nonlinear topological phases that
are adiabatically disconnected from the linear regime, showing the promise for
expanding the scope of topological classification of matter towards the
nonlinear regime.
Square-root topology is one of the newest additions to the ever expanding
field of topological insulators (TIs). It characterizes systems that relate to
their parent TI through the squaring of their Hamiltonians. Extensions to
$2^n$-root topology, where $n$ is the number of squaring operations involved in
retrieving the parent TI, were quick to follow. Here, we go one step further
and develop the framework for designing general $n$-root TIs, with $n$ any
positive integer, using the Su-Schrieffer-Heeger (SSH) model as the parent TI
from which the higher-root versions are constructed. The method relies on using
loops of unidirectional couplings as building blocks, such that the resulting
model is non-Hermitian and embedded with a generalized chiral symmetry. Edge
states are observed at the $n$ branches of the complex energy spectrum,
appearing within what we designate as a ring gap, shown to be irreducible to
the usual point or line gaps. We further detail on how such an $n$-root model
can be realistically implemented in photonic ring systems. Near perfect
unidirectional effective couplings between the main rings can be generated via
mediating auxiliary rings with modulated gains and losses. These induce high
imaginary gauge fields that strongly supress couplings in one direction, while
enhancing them in the other. We use these photonic lattices to validate and
benchmark the analytical predictions. Our results introduce a new class of
high-root topological models, as well as a route for their experimental
realization.
We introduce a novel gauge-invariant, quantized interband index in
two-dimensional (2D) multiband systems. It provides a bulk topological
classification of a submanifold of parameter space (e.g., an electron valley in
a Brillouin zone), and therefore overcomes difficulties in characterizing
topology of submanifolds. We confirm its topological nature by numerically
demonstrating a one-to-one correspondence to the valley Chern number in $k\cdot
p$ models (e.g., gapped Dirac fermion model), and the first Chern number in
lattice models (e.g., Haldane model). Furthermore, we derive a band-resolved
topological charge and demonstrate that it can be used to investigate the
nature of edge states due to band inversion in valley systems like multilayer
graphene.
Disordered topological insulator (TI) films have gained intense interest by
benefiting from both the TIs exotic transport properties and the advantage of
mass production by sputtering. Here, we report on the clear evidence of
spin-charge conversion (SCC) in amorphous Gd-alloyed BixSe1-x (BSG)/CoFeB
bilayers fabricated by sputtering, which could be related to the amorphous TI
surface states. Two methods have been employed to study SCC in BSG/CoFeB(5 nm)
bilayers with different BSG thicknesses. Firstly, spin pumping is used to
generate a spin current in CoFeB and to detect SCC by inverse Edelstein effect.
The maximum SCC efficiency (SCE) is measured as large as 0.035 nm in a 6 nm
thick BSG sample, which shows a strong decay when tBSG increases due to the
increase of BSG surface roughness. The second method is the THz time-domain
spectroscopy, which reveals a small tBSG dependence of SCE, validating the
occurrence of a pure interface state related SCC. Furthermore, our
angle-resolved photoemission spectroscopy data show dispersive two-dimensional
surface states that cross the bulk gap until to the Fermi level, strengthening
the possibility of SCC due to the amorphous TI states. Our studies provide a
new experimental direction towards the search for topological systems in the
amorphous solids.
The chiral Hamiltonian for twisted graphene bilayers is written as a
$2\times2$ matrix operator by a renormalization of the Hamiltonian that takes
into account the particle-hole symmetry. This results in an effective
Hamiltonian with an average field plus and effective non-Abelian gauge
potential. The action of the proposed renormalization maps the zero-mode region
into the ground state. Modes near zero energy have an antibonding nature in a
triangular lattice. This leads to a phase-frustration effect associated with
massive degeneration, and makes flat-bands modes similar to confined modes
observed in other bipartite lattices. Suprisingly, the proposed Hamiltonian
renormalization suggests that flat-bands at magic angles are akin to
floppy-mode bands in flexible crystals or glasses, making an unexpected
connection between rigidity topological theory and magic angle twisted
two-dimensional heterostructures physics.
The exploration of topologically-ordered states of matter is a long-standing
goal at the interface of several subfields of the physical sciences. Such
states feature intriguing physical properties such as long-range entanglement,
emergent gauge fields and non-local correlations, and can aid in realization of
scalable fault-tolerant quantum computation. However, these same features also
make creation, detection, and characterization of topologically-ordered states
particularly challenging. Motivated by recent experimental demonstrations, we
introduce a new paradigm for quantifying topological states -- locally
error-corrected decoration (LED) -- by combining methods of error correction
with ideas of renormalization-group flow. Our approach allows for efficient and
robust identification of topological order, and is applicable in the presence
of incoherent noise sources, making it particularly suitable for realistic
experiments. We demonstrate the power of LED using numerical simulations of the
toric code under a variety of perturbations. We subsequently apply it to an
experimental realization, providing new insights into a quantum spin liquid
created on a Rydberg-atom simulator. Finally, we extend LED to generic
topological phases, including those with non-abelian order.
We prove a generic spin-statistics relation for the fractional quasiparticles
that appear in abelian quantum Hall states on the disk. The proof is based on
an efficient way for computing the Berry phase acquired by a generic
quasiparticle translated in the plane along a circular path, and on the crucial
fact that once the gauge-invariant generator of rotations is projected onto a
Landau level, it fractionalizes among the quasiparticles and the edge. Using
these results we define a measurable quasiparticle fractional spin that
satisfies the spin-statistics relation. As an application, we predict the value
of the spin of the composite-fermion quasielectron proposed by Jain; our
numerical simulations agree with that value. We also show that Laughlin's
quasielectrons satisfy the spin-statistics relation, but carry the wrong spin
to be the anti-anyons of Laughlin's quasiholes. We continue by highlighting the
fact that the statistical angle between two quasiparticles can be obtained by
measuring the angular momentum whilst merging the two quasiparticles. Finally,
we show that our arguments carry over to the non-abelian case by discussing
explicitly the Moore-Read wavefunction.
We study quantum phase transitions of three-dimensional disordered systems in
the chiral classes (AIII and BDI) with and without weak topological indices. We
show that the systems with a nontrivial weak topological index universally
exhibit an emergent thermodynamic phase where wave functions are delocalized
along one spatial direction but exponentially localized in the other two
spatial directions, which we call the quasi-localized phase. Our extensive
numerical study clarifies that the critical exponent of the Anderson transition
between the metallic and quasi-localized phases, as well as that between the
quasi-localized and localized phases, are different from that with no weak
topological index, signaling the new universality classes induced by topology.
The quasi-localized phase and concomitant topological Anderson transition
manifest themselves in the anisotropic transport phenomena of disordered weak
topological insulators and nodal-line semimetals, which exhibit the metallic
behavior in one direction but the insulating behavior in the other directions.
The development of nanocomposites relies on structure-property relations,
which necessitate multiscale modeling approaches. This study presents a
modelling framework that exploits mesoscopic models to predict the thermal and
mechanical properties of nanocomposites starting from their molecular
structure. In detail, mesoscopic models of polypropylene (PP) and graphene
based nanofillers (Graphene (Gr), Graphene Oxide (GO), and reduced Graphene
Oxide (rGO)) are considered. The newly developed mesoscopic model for the PP/Gr
nanocomposite provides mechanistic information on the thermal and mechanical
properties at the filler-matrix interface, which can be then exploited to
enhance the prediction accuracy of traditional continuum simulations by
calibrating the thermal and mechanical properties of the filler-matrix
interface. Once validated through a dedicated experimental campaign, this
multiscale model demonstrates that with the modest addition of nanofillers (up
to 2 wt.%), the Young's modulus and thermal conductivity show up to 35% and 25%
enhancement, respectively, while the Poisson's ratio slightly decreases. Among
the different combinations tested, PP/Gr nanocomposite shows the best
mechanical properties, whereas PP/rGO demonstrates the best thermal
conductivity. This validated mesoscopic model can contribute to the development
of smart materials with enhanced mechanical and thermal properties based on
polypropylene, especially for mechanical, energy storage, and sensing
applications.
We show that topological characterization and classification in
$D$-dimensional systems, which are thermodynamically large in only $D-\delta$
dimensions and finite in size in $\delta$ dimensions, is fundamentally
different from that of systems thermodynamically large in all $D$-dimensions:
as $(D-\delta)$-dimensional topological boundary states permeate into a
system's $D$ dimensional bulk with decreasing system size, they hybridize to
create novel topological phases characterized by a set of $\delta+1$
topological invariants, ranging from the $D$-dimensional topological invariant
to the $(D-\delta)$-dimensional topological invariant. The system exhibits
topological response signatures and bulk-boundary correspondences governed by
combinations of these topological invariants taking non-trivial values, with
lower-dimensional topological invariants characterizing fragmentation of the
underlying topological phase of the system thermodynamically large in all
$D$-dimensions. We demonstrate this physics for the paradigmatic Chern
insulator phase, but show its requirements for realization are satisfied by a
much broader set of topological systems.
The valence structure of magnetic centers is one of the factors that
determines the characteristics of a magnet. It may pertain to orbital
degeneracy, as for $j_\text{eff}=1/2$ Kitaev magnets, or near-degeneracy, e.g.
$3d$-$4s$, in cuprate superconductors. Here we explore the inner structure of
magnetic moments in group-5 lacunar spinels, fascinating materials featuring
multisite magnetic units in the form of tetrahedral tetramers. Our analysis
reveals a very colorful landscape, much richer than the generic (...)$t_2^1$
single-configuration description applied so far to all group-5 Ga$M_4X_8$
chalcogenides, and clarifies the basic multiorbital correlations on $M_4$
units: while for V ions strong correlations yield a wave-function that can be
well described in terms of four V$^{4+}$V$^{3+}$V$^{3+}$V$^{3+}$ resonant
valence structures, for Nb and Ta a picture of dressed molecular-orbital-like
$j_\text{eff}=3/2$ entities is more appropriate. These internal degrees of
freedom likely shape vibronic couplings, phase transitions, and
magneto-electric properties in each of these systems.
Quantum entanglement is a particularly useful characterization of topological
orders which lack conventional order parameters. In this work, we study the
entanglement in topologically ordered states between two arbitrary spatial
regions, using two distinct mixed-state entanglement measures: the so-called
"computable cross-norm or realignment" (CCNR) negativity, and the more
well-known partial-transpose (PT) negativity. We first generally compute the
entanglement measures: We obtain general expressions both in (2+1)D
Chern-Simons field theories under certain simplifying conditions, and in the
Pauli stabilizer formalism that applies to lattice models in all dimensions.
While the field-theoretic results are expected to be topological and universal,
the lattice results contain nontopological/nonuniversal terms as well. This
raises the important problem of continuum-lattice comparison which is crucial
for practical applications. When the two spatial regions and the remaining
subsystem do not have triple intersection, we solve the problem by proposing a
general strategy for extracting the topological and universal terms in both
entanglement measures. Examples in the (2+1)D $Z_2$ toric code model are also
presented. In the presence of trisection points, however, our result suggests
that the subleading piece in the PT negativity is not topological and depends
on the local geometry of the trisections, which is in harmonics with a
technical subtlety in the field-theoretic calculation.
Non-Hermitian quasicrystal forms a unique class of matter with
symmetry-breaking, localization and topological transitions induced by gain and
loss or nonreciprocal effects. In this work, we introduce a non-Abelian
generalization of the non-Hermitian quasicrystal, in which the interplay
between non-Hermitian effects and non-Abelian quasiperiodic potentials create
mobility edges and rich transitions among extended, critical and localized
phases. These generic features are demonstrated by investigating three
non-Abelian variants of the non-Hermitian Aubry-Andr\'e-Harper model. A unified
characterization is given to their spectrum, localization, entanglement and
topological properties. Our findings thus add new members to the family of
non-Hermitian quasicrystal and uncover unique physics that can be triggered by
non-Abelian effects in non-Hermitian systems.
We consider Lifshitz criticality (LC) with the dynamical critical exponent
$z=2$ in one-dimensional interacting fermions with a filled Dirac Sea. We
report that interactions have crucial effects on Lifshitz criticality. Single
particle excitations are destabilized by interaction and decay into the
particle-hole continuum, which is reflected in the logarithmic divergence in
the imaginary part of one-loop self-energy. We show that the system is
sensitive to the sign of interaction. Random-phase approximation (RPA) shows
that the collective particle-hole excitations emerge only when the interaction
is repulsive. The dispersion of collective modes is gapless and linear.
If the interaction is attractive, the one-loop renormalization group (RG)
shows that there may exist a stable RG fixed point described by two coupling
constants. We also show that the on-site interaction (without any other
perturbations at the UV scale) would always turn on the relevant velocity
perturbation to the quadratic Lagrangian in the RG flow, driving the system
flow to the conformal-invariant criticality. In the numerical simulations of
the lattice model at the half-filling, we find that, for either on-site
positive or negative interactions, the dynamical critical exponent becomes
$z=1$ in the infrared (IR) limit and the entanglement entropy is a logarithmic
function of the system size $L$. The work paves the way to study
one-dimensional interacting LCs.
External magnetic fields conventionally suppress superconductivity, both by
orbital and paramagnetic effects. A recent experiment has shown that in a
Bernal stacked bilayer graphene system, the opposite occurs -- a finite
critical magnetic field is necessary to observe superconducting features
occurring in the vicinity of a magnetic phase transition. We propose an
extraordinary electronic-correlation-driven mechanism by which this anomalous
superconductivity manifests. Specifically, the electrons tend to avoid band
occupations near high density of states regions due to their mutual repulsion.
Considering the nature of spontaneous symmetry breaking involved, we dub this
avoidance Stoner blockade. We show how a magnetic field softens this blockade,
allowing weak superconductivity to take place, consistent with experimental
findings. Our principle prediction is that a small reduction of the Coulomb
repulsion would result in sizable superconductivity gains, both in achieving
higher critical temperatures and expanding the superconducting regime. Within
the theory we present, magnetic field and spin-orbit coupling of the Ising type
have a similar effect on the Bernal stacked bilayer graphene system,
elucidating the emergence of superconductivity when the system is proximitized
to a $\rm WSe_2$ substrate. We further demonstrate in this paper the
sensitivity of superconductivity to disorder in the proposed scenario. We find
that a disorder that does not violate Anderson's theorem may still induce a
reduction of $T_c$ through its effect on the density of states, establishing
the delicate nature of the Bernal bilayer graphene superconductor.
One-dimensional Floquet topological superconductors possess two types of
degenerate Majorana edge modes at zero and $\pi$ quasieneriges, leaving more
room for the design of boundary time crystals and quantum computing schemes
than their static counterparts. In this work, we discover Floquet
superconducting phases with large topological invariants and arbitrarily many
Majorana edge modes in periodically driven Kitaev chains. Topological winding
numbers defined for the Floquet operator and Floquet entanglement Hamiltonian
are found to generate consistent predictions about the phase diagram, bulk-edge
correspondence and numbers of zero and $\pi$ Majorana edge modes of the system
under different driving protocols. The bipartite entanglement entropy further
show non-analytic behaviors around the topological transition point between
different Floquet superconducting phases. These general features are
demonstrated by investigating the Kitaev chain with periodically kicked pairing
or hopping amplitudes. Our discovery reveals the rich topological phases and
many Majorana edge modes that could be brought about by periodic driving fields
in one-dimensional superconducting systems. It further introduces a unified
description for a class of Floquet topological superconductors from their
quasienergy bands and entanglement properties.
We study reduced density matrices of the integrable critical RSOS model in a
particular topological sector containing the ground state. Similar as in the
spin-$1/2$ Heisenberg model it has been observed that correlation functions of
this model on short segments can be `factorized': they are completely
determined by a single nearest-neighbour two-point function $\omega$ and a set
of structure functions. While $\omega$ captures the dependence on the system
size and the state of the system the structure functions can be expressed in
terms of the possible operators on the segment, in the present case
representations of the Temperley-Lieb algebra $\text{TL}_n$, and are
independent of the model parameters. We present explicit results for the
function $\omega$ in the infinite system ground state of the model and compute
multi-point local height probabilities for up to four adjacent sites for the
RSOS model and the related three-point correlation functions of non-Abelian
$su(2)_k$ anyons.
Electrochemical energy storage always involves the capacitive process. The
prevailing electrode model used in the molecular simulation of polarizable
electrode-electrolyte systems is the Siepmann-Sprik model developed for perfect
metal electrodes. This model has been recently extended to study the
metallicity in the electrode by including the Thomas-Fermi screening length.
Nevertheless, a further extension to heterogeneous electrode models requires
introducing chemical specificity which does not have any analytical recipes.
Here, we address this challenge by integrating the atomistic machine learning
code (PiNN) for generating the base charge and response kernel and the
classical molecular dynamics code (MetalWalls) dedicated to the modelling of
electrochemical systems, and this leads to the development of the PiNNwall
interface. Apart from the cases of chemically doped graphene and graphene oxide
electrodes as shown in this study, the PiNNwall interface also allows us to
probe polarized oxide surfaces in which both the proton charge and the
electronic charge can coexist. Therefore, this work opens the door for
modelling heterogeneous and complex electrode materials often found in energy
storage systems.
We predict a large in-plane polarization response to bending in a broad class
of trigonal two-dimensional crystals. We define and compute the relevant
flexoelectric coefficients from first principles as linear-response properties
of the undistorted layer, by using the primitive crystal cell. The ensuing
response (evaluated for SnS$_{2}$, silicene, phosphorene and RhI$_{3}$
monolayers and for a hexagonal BN bilayer) is up to one order of magnitude
larger than the out-of-plane components in the same material. We illustrate the
topological implications of our findings by calculating the polarization
textures that are associated with a variety of rippled and bent structures. We
also determine the longitudinal electric fields induced by a flexural phonon at
leading order in amplitude and momentum.
The past few years have witnessed a surge of interest in non-Hermitian
Floquet topological matters due to their exotic properties resulting from the
interplay between driving fields and non-Hermiticity. The present review sums
up our studies on non-Hermitian Floquet topological matters in one and two
spatial dimensions. We first give a bird's-eye view of the literature for
clarifying the physical significance of non-Hermitian Floquet systems. We then
introduce, in a pedagogical manner, a number of useful tools tailored for the
study of non-Hermitian Floquet systems and their topological properties. With
the aid of these tools, we present typical examples of non-Hermitian Floquet
topological insulators, superconductors, and quasicrystals, with a focus on
their topological invariants, bulk-edge correspondences, non-Hermitian skin
effects, dynamical properties, and localization transitions. We conclude this
review by summarizing our main findings and presenting our vision of future
directions.
Phase separation of multicomponent lipid membranes is characterized by the
nucleation and coarsening of circular membrane domains that grow slowly in time
as $\sim t^{1/3}$, following classical theories of coalescence and Ostwald
ripening. In this work, we study the coarsening kinetics of phase-separating
lipid membranes subjected to nonequilibrium forces and flows transmitted by
motor-driven gliding actin filaments. We experimentally observe that the
activity-induced surface flows trigger rapid coarsening of non-circular
membrane domains that grow as $\sim t^{2/3}$, a 2$\times$ acceleration in the
growth exponent compared to passive coalescence and Ostwald ripening. We
analyze these results by developing analytical theories based on the
Smoluchowski coagulation model and the phase field model to predict the domain
growth in the presence of active flows. Our work demonstrates that active
matter forces may be used to control the growth and morphology of membrane
domains driven out of equilibrium.
Despite the extensive studies of topological systems, the experimental
characterizations of strongly nonlinear topological phases have been lagging.
To address this shortcoming, we design and build elliptically geared isostatic
metamaterials. Their nonlinear topological transitions can be realized by
collective soliton motions, which stem from the transition of nonlinear Berry
phase. Endowed by the intrinsic nonlinear topological mechanics, surface polar
elasticity and dislocation-bound zero modes can be created or annihilated as
the topological polarization reverses orientation. Our approach integrates
topological physics with strongly nonlinear mechanics and promises multi-phase
structures at the micro and macro scales.
The superconducting state with the usual 2e-flux quantization formed from a
normal state with 3Q charge density or loop-current order is a linear
combination of 3 different paired states with an overall gauge invariant phase
and two internal phases such that the phases in equilibrium are at $2\pi/3$
with respect to each other. In the fluctuation regime of such a 3-component
superconductor, internal phase fluctuations are of the same class as for
frustrated classical xy-spins on a triangular lattice. The fluctuation region
is known therefore to be abnormally extended below the mean-field or the
Kosterlitz-Thouless transition temperature. A 6e-flux and a 4e-flux quantized
states can be constructed which are also eigenstates of the BCS Hamiltonian and
stationary points of the Ginzburg-Landau free-energy with a transition
temperature above that of the renormalized 2e-flux quantized state. Such states
have no internal phases and so no frustrating internal phase fluctuations.
These state however cannot acquire long-range order because their free-energy
is higher than the co-existing fluctuating state of 2e flux-quantization. 6e-
as well as 4e- flux-quantized Little-Parks oscillations however occur in which
the resistivity increases periodically with field above that of the
2e-fluctuating state in its extended fluctuation regime, as are observed,
followed at low temperatures to a condensation of the time-reversal odd
2e-quantized state
A material called LK-99, a modified-lead apatite crystal structure with the
composition Pb$_{10-x}$Cu$_x$(PO$_4$)$_{6O}$ ($0.9<x<1.1$), has been
synthesized using the solid-state method. The material exhibits the Ohmic metal
characteristic of Pb(6s1) above its superconducting critical temperature,
$T_c$, and the levitation phenomenon as Meissner effect of a superconductor at
room temperature and atmospheric pressure below $T_c$. A LK-99 sample shows
$T_c$ above 126.85$^\circ$C (400 K). We analyze that the possibility of
room-temperature superconductivity in this material is attributed to two
factors: the first being the volume contraction resulting from an
insulator-metal transition achieved by substituting Pb with Cu, and the second
being on-site repulsive Coulomb interaction enhanced by the structural
deformation in the one-dimensional(D) chain (Pb2-O$_{1/2}$-Pb2 along the
c-axis) structure owing to superconducting condensation at $T_c$. The mechanism
of the room-temperature $T_c$ is discussed by 1-D BR-BCS theory.
We describe the interplay between electric-magnetic duality and higher
symmetry in Maxwell theory. When the fine-structure constant is rational, the
theory admits non-invertible symmetries which can be realized as composites of
electric-magnetic duality and gauging a discrete subgroup of the one-form
global symmetry. These non-invertible symmetries are approximate quantum
invariances of the natural world which emerge in the infrared below the mass
scale of charged particles. We construct these symmetries explicitly as
topological defects and illustrate their action on local and extended
operators. We also describe their action on boundary conditions and illustrate
some consequences of the symmetry for Hilbert spaces of the theory defined in
finite volume.
In the paper "Life, the Universe, and everything--42 fundamental questions",
Roland Allen and Suzy Lidstr\"om presented personal selection of the
fundamental questions. Here, based on the condensed matter experience, we
suggest the answers to some questions concerning the vacuum energy, black hole
entropy and the origin of gravity. In condensed matter we know both the
many-body phenomena emerging on the macroscopic level and the microscopic
(atomic) physics, which generates this emergence. It appears that the same
macroscopic phenomenon may be generated by essentially different microscopic
backgrounds. This points to various possible directions in study of the deep
quantum vacuum of our Universe.
Monitored quantum dynamics -- unitary evolution interspersed with
measurements -- has recently emerged as a rich domain for phase structure in
quantum many-body systems away from equilibrium. Here we study monitored
dynamics from the point of view of an eavesdropper who has access to the
classical measurement outcomes, but not to the quantum many-body system. We
show that a measure of information flow from the quantum system to the
classical measurement record -- the informational power -- undergoes a phase
transition in correspondence with the measurement-induced phase transition
(MIPT). This transition determines the eavesdropper's (in)ability to learn
properties of an unknown initial quantum state of the system, given a complete
classical description of the monitored dynamics and arbitrary classical
computational resources. We make this learnability transition concrete by
defining classical shadows protocols that the eavesdropper may apply to this
problem, and show that the MIPT manifests as a transition in the sample
complexity of various shadow estimation tasks, which become harder in the
low-measurement phase. We focus on three applications of interest: Pauli
expectation values (where we find the MIPT appears as a point of optimal
learnability for typical Pauli operators), many-body fidelity, and global
charge in $U(1)$-symmetric dynamics. Our work unifies different manifestations
of the MIPT under the umbrella of learnability and gives this notion a general
operational meaning via classical shadows.
Chaotic dependence on temperature refers to the phenomenon of divergence of
Gibbs measures as the temperature approaches a certain value. Models with
chaotic behaviour near zero temperature have multiple ground states, none of
which are stable. We study the class of uniformly chaotic models, that is,
those in which, as the temperature goes to zero, every choice of Gibbs measures
accumulates on the entire set of ground states. We characterise the possible
sets of ground states of uniformly chaotic finite-range models up to computable
homeomorphisms.
Namely, we show that the set of ground states of every model with
finite-range and rational-valued interactions is topologically closed and
connected, and belongs to the class $\Pi_2$ of the arithmetical hierarchy.
Conversely, every $\Pi_2$-computable, topologically closed and connected set of
probability measures can be encoded (via a computable homeomorphism) as the set
of ground states of a uniformly chaotic two-dimensional model with finite-range
rational-valued interactions.

Date of feed: Tue, 01 Aug 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]+) **Scaling transition of active turbulence from two to three dimensions. (arXiv:2307.15720v1 [cond-mat.soft])**

Da Wei, Yaochen Yang, Xuefeng Wei, Ramin Golestanian, Ming Li, Fanlong Meng, Yi Peng

**Selective Manipulation and Tunneling Spectroscopy of Broken-Symmetry Quantum Hall States in a Hybrid-edge Quantum Point Contact. (arXiv:2307.15728v1 [cond-mat.mes-hall])**

Wei Ren, Xi Zhang, Jaden Ma, Xihe Han, Kenji Watanabe, Takashi Taniguchi, Ke Wang

**Magnetic Antiskyrmions in Two-Dimensional van der Waals Magnets Engineered by Layer Stacking. (arXiv:2307.15769v1 [cond-mat.mtrl-sci])**

Kai Huang, Edward Schwartz, Ding-Fu Shao, Alexey A. Kovalev, Evgeny Y. Tsymbal

**Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2. (arXiv:2307.15784v1 [cond-mat.supr-con])**

Katsuki Kinjo, Hiroki Fujibayashi, Hiroki Matsumura, Fumiya Hori, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki

**Electronic transport and thermoelectricity in selenospinel Cu$_{6-x}$Fe$_{4+x}$Sn$_{12}$Se$_{32}$. (arXiv:2307.15797v1 [cond-mat.mtrl-sci])**

Yu Liu, Zhixiang Hu, Xiao Tong, David Graf, C. Petrovic

**Comment on Hess et al. Phys. Rev. Lett. {\bf 130}, 207001 (2023). (arXiv:2307.15813v1 [cond-mat.mes-hall])**

A. Antipov, W. Cole, K. Kalashnikov, F. Karimi, R. Lutchyn, C. Nayak, D. Pikulin, G. Winkler

**Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands. (arXiv:2307.15828v1 [cond-mat.mtrl-sci])**

Shuyu Cheng, M. Nrisimhamurty, Tong Zhou, Nuria Bagues, Wenyi Zhou, Alexander J. Bishop, Igor Lyalin, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, David W. McComb, Igor Zutic, Roland K. Kawakami

**Evidence for Two Dimensional Anisotropic Luttinger Liquids at Millikelvin Temperatures. (arXiv:2307.15881v1 [cond-mat.mes-hall])**

Guo Yu, Pengjie Wang, Ayelet J. Uzan, Yanyu Jia, Michael Onyszczak, Ratnadwip Singha, Xin Gui, Tiancheng Song, Yue Tang, Kenji Watanabe, Takashi Taniguchi, Robert J. Cava, Leslie M. Schoop, Sanfeng Wu

**Fano resonances in tilted Weyl semimetals in an oscillating quantum well. (arXiv:2307.15928v1 [cond-mat.mes-hall])**

Souvik Das, Arnab Maity, Rajib Sarkar, Anirudha Menon, Tanay Nag, Banasri Basu

**Unconventional optical response in monolayer graphene upon dominant intraband scattering. (arXiv:2307.15945v1 [cond-mat.mes-hall])**

Palash Saha, Bala Murali Krishna Mariserla

**Comparative $^{181}$Ta-NQR Study of Weyl Monopnictides TaAs and TaP: Relevance of Weyl Fermion Excitations. (arXiv:2307.16009v1 [cond-mat.str-el])**

Tetsuro Kubo, Hiroshi Yasuoka, Balázs Dóra, Deepa Kasinathan, Yurii Prots, Helge Rosner, Takuto Fujii, Marcus Schmidt, Michael Baenitz

**Swapping exchange and spin-orbit induced correlated phases in ex-so-tic van der Waals heterostructures. (arXiv:2307.16025v1 [cond-mat.mtrl-sci])**

Yaroslav Zhumagulov, Denis Kochan, Jaroslav Fabian

**Single-spin spectroscopy of spontaneous and phase-locked spin torque oscillator dynamics. (arXiv:2307.16049v1 [cond-mat.mes-hall])**

Adrian Solyom, Michael Caouette-Mansour, Brandon Ruffolo, Patrick Braganca, Lilian Childress, Jack Sankey

**Novel Topological Anderson insulating phases in the interacting Haldane model. (arXiv:2307.16053v1 [cond-mat.str-el])**

Joao S. Silva, Eduardo V. Castro, Rubem Mondaini, María A. H. Vozmediano, M. Pilar López-Sancho

**Easing the equilibration of spin systems with quenched disorder in Population Annealing by topological-defect-driven non-local updates. (arXiv:2307.16087v1 [cond-mat.dis-nn])**

David Cirauqui, Miguel Ángel García-March, José Ramón Martínez Saavedra, Maciej Lewenstein, Przemysław R. Grzybowski

**Direct and Indirect methods of electrocaloric effect determination and energy storage calculation in (Na0.8K0.2)0.5Bi0.5TiO3 ceramic. (arXiv:2307.16232v1 [cond-mat.mtrl-sci])**

Pravin Varade, Adityanarayan H. Pandey, N. Shara Sowmya, S. M. Gupta, Abhay Bhisikar, N. Venkataramani, A. R. Kulkarni

**Topological electronic bands in crystalline solids. (arXiv:2307.16258v1 [cond-mat.str-el])**

Andrew T. Boothroyd

**Ion-beam-milled graphite nanoribbons as mesoscopic carbon-based polarizers. (arXiv:2307.16340v1 [cond-mat.mes-hall])**

Marcin Muszyński, Igor Antoniazzi, Bruno Camargo

**Spin decoherence in VOPc@graphene nanoribbon complexes. (arXiv:2307.16403v1 [cond-mat.mes-hall])**

Xiao Chen, James N. Fry, H. P. Cheng

**Magneto-optical Kerr and Faraday effects in bilayer antiferromagnetic insulators. (arXiv:2307.16435v1 [cond-mat.mes-hall])**

Wan-Qing Zhu, Wen-Yu Shan

**Fourier transformation based analysis routine for intermixed longitudinal and transversal hysteretic data for the example of a magnetic topological insulator. (arXiv:2307.16450v1 [cond-mat.mes-hall])**

Erik Zimmermann, Michael Schleenvoigt, Alina Rupp, Gerrit Behner, Jan Karthein, Justus Teller, Peter Schüffelgen, Hans Lüth, Detlev Grützmacher, Thomas Schäpers

**Emergence of stable meron quartets in twisted magnets. (arXiv:2307.16505v1 [cond-mat.mes-hall])**

Kyoung-Min Kim, Gyungchoon Go, Moon Jip Park, Se Kwon Kim

**Violation of the Wiedemann-Franz law in coupled thermal and power transport of optical waveguide arrays. (arXiv:2307.16529v1 [cond-mat.mes-hall])**

Meng Lian, Yin-Jie Chen, Yue Geng, Yun-Tian Chen, Jing-Tao Lü

**Two-Dimensional Moir\'e Polaronic Electron Crystals. (arXiv:2307.16563v1 [cond-mat.str-el])**

Eric A. Arsenault, Yiliu Li, Birui Yang, Xi Wang, Heonjoon Park, Edoardo Mosconi, Enrico Ronca, Takashi Taniguchi, Kenji Watanabe, Daniel Gamelin, Andrew Millis, Cory R. Dean, Filippo de Angelis, Xiaodong Xu, X.-Y. Zhu

**On-surface synthesis and characterization of Teranthene and Hexanthene: Ultrashort graphene nanoribbons with mixed armchair and zigzag edges. (arXiv:2307.16596v1 [cond-mat.mtrl-sci])**

Gabriela Borin Barin, Marco Di Giovannantonio, Thorsten G. Lohr, Shantanu Mishra, Amogh Kinikar, Mickael L. Perrin, Jan Overbeck, Michel Calame, Xinliang Feng, Roman Fasel, Pascal Ruffieux

**Reliable Synthesis of Large-Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation. (arXiv:2307.16629v1 [cond-mat.mtrl-sci])**

Qianhui Zhang, Jianfeng Lu, Ziyu Wang, Zhigao Dai, Yupeng Zhang, Fuzhi Huang, Qiaoliang Bao, Wenhui Duan, Michael S. Fuhrer, Changxi Zheng

**Rheology of Pseudomonas fluorescens biofilms: from experiments to predictive DPD mesoscopic modelling. (arXiv:2307.16641v1 [cond-mat.soft])**

Jose Mart.n-Roca, Valentino Bianco, Francisco Alarcon, Ajay K. Monnappa, Paolo Natale, Francisco Monroy, Belen Orgaz, Ivan L.pez-Montero, Chantal Valeriani

**Femtomolar detection of the heart failure biomarker NT-proBNP in artificial saliva using an immersible liquid-gated aptasensor with reduced graphene oxide. (arXiv:2307.16692v1 [cond-mat.mtrl-sci])**

Stefan Jaric, Anastasiia Kudriavtseva, Nikita Nekrasov, Alexey V. Orlov, Ivan A. Komarov, Leonty A. Barsukov, Ivana Gadjanski, Petr I. Nikitin, Ivan Bobrinetskiy

**Electron correlations and superconductivity in La$_3$Ni$_2$O$_7$ under pressure tuning. (arXiv:2307.16697v1 [cond-mat.supr-con])**

Zhiguang Liao, Lei Chen, Guijing Duan, Yiming Wang, Changle Liu, Rong Yu, Qimiao Si

**Stability via symmetry breaking in interacting driven systems. (arXiv:2307.16743v1 [quant-ph])**

Andrew Pocklington, Aashish A. Clerk

**Nonlinearity-induced topological phase transition characterized by the nonlinear Chern number. (arXiv:2307.16827v1 [cond-mat.mes-hall])**

Kazuki Sone, Motohiko Ezawa, Yuto Ashida, Nobuyuki Yoshioka, Takahiro Sagawa

**Topological $n$-root Su-Schrieffer-Heeger model in a non-Hermitian photonic ring system. (arXiv:2307.16855v1 [physics.optics])**

David Viedma, Anselmo M. Marques, Ricardo G. Dias, Verònica Ahufinger

**A Quantized Interband Topological Index in Two-Dimensional Systems. (arXiv:2307.16893v1 [cond-mat.mes-hall])**

Tharindu Fernando, Ting Cao

**Room Temperature Spin to Charge Conversion in Amorphous Topological Insulating Gd-Alloyed BixSe1-x/CoFeB Bilayers. (arXiv:1911.03323v12 [cond-mat.mtrl-sci] UPDATED)**

Protyush Sahu, Yifei Yang, Yihong Fan, Henri Jaffres, Jun-Yang Chen, Xavier Devaux, Yannick Fagot-Revurat, Sylvie Migot, Enzo Rongione, Sukdheep Dhillon, Tongxin Chen, Pambiang Abel Dainone, Jean-Marie George, Yuan Lu, Jian-Ping Wang

**Reduction of the Twisted Bilayer Graphene Chiral Hamiltonian into a $2\times2$ matrix operator and physical origin of flat-bands at magic angles. (arXiv:2102.09473v4 [cond-mat.mes-hall] UPDATED)**

Gerardo G. Naumis, Leonardo A. Navarro-Labastida, Enrique Aguilar-Méndez, Abdiel Espinosa-Champo

**Enhancing Detection of Topological Order by Local Error Correction. (arXiv:2209.12428v2 [quant-ph] UPDATED)**

Iris Cong, Nishad Maskara, Minh C. Tran, Hannes Pichler, Giulia Semeghini, Susanne F. Yelin, Soonwon Choi, Mikhail D. Lukin

**Spin-statistics relation for quantum Hall states. (arXiv:2211.07788v2 [cond-mat.mes-hall] UPDATED)**

Alberto Nardin, Eddy Ardonne, Leonardo Mazza

**Anisotropic Topological Anderson Transitions in Chiral Symmetry Classes. (arXiv:2211.09999v2 [cond-mat.dis-nn] UPDATED)**

Zhenyu Xiao, Kohei Kawabata, Xunlong Luo, Tomi Ohtsuki, Ryuichi Shindou

**Mesoscopic modeling and experimental validation of thermal and mechanical properties of polypropylene nanocomposites reinforced by graphene-based fillers. (arXiv:2211.13148v2 [cond-mat.mtrl-sci] UPDATED)**

Atta Muhammad, Rajat Srivastava, Nikos Koutroumanis, Dionisis Semitekolos, Eliodoro Chiavazzo, Panagiotis-Nektarios Pappas, Costas Galiotis, Pietro Asinari, Costas A. Charitidis, Matteo Fasano

**Finite-size Topology. (arXiv:2212.11300v2 [cond-mat.mes-hall] UPDATED)**

Ashley M. Cook, Anne E. B. Nielsen

**Luxuriant correlation landscape in lacunar spinels: multiconfiguration expansions in molecular-orbital basis vs resonant valence structures. (arXiv:2301.03392v2 [cond-mat.str-el] UPDATED)**

Thorben Petersen, Pritam Bhattacharyya, Ulrich K. Rößler, Liviu Hozoi

**Mixed-State Entanglement Measures in Topological Order. (arXiv:2301.08207v2 [cond-mat.str-el] UPDATED)**

Chao Yin, Shang Liu

**Non-Abelian generalization of non-Hermitian quasicrystal: PT-symmetry breaking, localization, entanglement and topological transitions. (arXiv:2302.05710v2 [quant-ph] UPDATED)**

Longwen Zhou

**Quantum $z=2$ Lifshitz criticality in one-dimensional interacting fermions. (arXiv:2302.13243v2 [cond-mat.str-el] UPDATED)**

Ke Wang

**Inducing superconductivity in bilayer graphene by alleviation of the Stoner blockade. (arXiv:2303.04176v2 [cond-mat.supr-con] UPDATED)**

Gal Shavit, Yuval Oreg

**Floquet topological superconductors with many Majorana edge modes: topological invariants, entanglement spectrum and bulk-edge correspondence. (arXiv:2303.04674v2 [cond-mat.mes-hall] UPDATED)**

Hailing Wu, Shenlin Wu, Longwen Zhou

**Factorization of density matrices in the critical RSOS models. (arXiv:2303.15252v2 [cond-mat.stat-mech] UPDATED)**

Daniel Westerfeld, Maxime Großpietsch, Hannes Kakuschke, Holger Frahm

**PiNNwall: heterogeneous electrode models from integrating machine learning and atomistic simulation. (arXiv:2303.15307v3 [cond-mat.mtrl-sci] UPDATED)**

Thomas Dufils, Lisanne Knijff, Yunqi Shao, Chao Zhang

**In-plane flexoelectricity in two-dimensional $D_{3d}$ crystals. (arXiv:2303.18124v2 [cond-mat.mtrl-sci] UPDATED)**

Matteo Springolo, Miquel Royo, Massimiliano Stengel

**Non-Hermitian Floquet Topological Matter -- A Review. (arXiv:2305.16153v3 [quant-ph] UPDATED)**

Longwen Zhou, Da-Jian Zhang

**Active surface flows accelerate the coarsening of lipid membrane domains. (arXiv:2306.00218v3 [cond-mat.soft] UPDATED)**

Daniel P. Arnold, Aakanksha Gubbala, Sho C. Takatori

**Nonlinear Topological Mechanics in Elliptically Geared Isostatic Metamaterials. (arXiv:2307.00031v2 [cond-mat.mtrl-sci] UPDATED)**

Fangyuan Ma, Zheng Tang, Xiaotian Shi, Ying Wu, Jinkyu Yang, Di Zhou, Yugui Yao, Feng Li

**Extended superconducting fluctuation region and 6e and 4e flux-quantization in a Kagome compound with a normal state of 3Q-order. (arXiv:2307.00448v2 [cond-mat.supr-con] UPDATED)**

Chandra M. Varma, Ziqiang Wang

**Superconductor Pb$_{10-x}$Cu$_x$(PO$_4$)$_{6O}$ showing levitation at room temperature and atmospheric pressure and mechanism. (arXiv:2307.12037v2 [cond-mat.supr-con] UPDATED)**

Sukbae Lee, Jihoon Kim, Hyun-Tak Kim, Sungyeon Im, SooMin An, Keun Ho Auh

**Quantum Duality in Electromagnetism and the Fine-Structure Constant. (arXiv:2307.12927v2 [hep-th] UPDATED)**

Clay Cordova, Kantaro Ohmori

**Views on gravity from condensed matter physics. (arXiv:2307.14370v2 [cond-mat.other] UPDATED)**

G.E. Volovik

**Learnability transitions in monitored quantum dynamics via eavesdropper's classical shadows. (arXiv:2307.15011v2 [quant-ph] UPDATED)**

Matteo Ippoliti, Vedika Khemani

**Characterisation of the Set of Ground States of Uniformly Chaotic Finite-Range Lattice Models. (arXiv:2302.07326v2 [math-ph] CROSS LISTED)**

Léo Gayral, Mathieu Sablik, Siamak Taati

Found 10 papers in prb Charge transfer in type-II heterostructures plays important roles in determining device performance for photovoltaic and photocatalytic applications. However, current theoretical studies of charge transfer process do not consider the effects of operating conditions such as illuminations and yield sy… We report the emergence of time-crystalline behavior in the $π$-Berry phase protected edge states of a Heisenberg ferromagnet in the presence of an external driving field. The magnon amplification due to the external field spontaneously breaks the discrete time-translational symmetry, resulting in a… We report the magnetic and magnetoelectric properties of two isostructural polar compounds $\mathrm{Lu}M\mathrm{W}{\mathrm{O}}_{6}\phantom{\rule{4pt}{0ex}}(M=\mathrm{Fe}$ and Cr) that were synthesized at high pressure and high temperatures. Both compounds have a polar orthorhombic aeschynite-type st… A spin-1/2 triangular-lattice antiferromagnet is a prototypical frustrated quantum magnet, which exhibits remarkable quantum many-body effects that arise from the synergy between geometric spin frustration and quantum fluctuations. It can host quantum frustrated magnetic topological phenomena such a… We study the energy spectrum of tight-binding Hamiltonians for regular hyperbolic tilings. More specifically, we compute the density of states using the continued-fraction expansion of the Green's function on finite-size systems with more than ${10}^{9}$ sites and open boundary conditions. The coeff… We theoretically discuss electronic transport via Majorana states in magnetic topological insulator-superconductor junctions with an asymmetric split of the applied bias voltage. We study normal-superconductor-normal (NSN) junctions made of narrow (wirelike) or wide (filmlike) magnetic topological i… The high-quality structures containing semiconducting transition-metal dichalcogenide (S-TMD) monolayers (MLs) required for optical and electrical studies are achieved by their encapsulation in hexagonal BN (hBN) flakes. To examine the effect of hBN thickness in these systems, we consider a model wi… We present a prediction of chiral topological metals with several classes of unconventional quasiparticle fermions in a family of SrGePt-type materials in terms of first-principles calculations. In these materials, fourfold spin-3/2 Rarita-Schwinger-Weyl (RSW) fermion, sixfold excitation, and Weyl f… It is now widely recognized that the toric code is a pure gauge-theory model governed by a projective Hamiltonian with topological orders. In this paper, we extend the interplay between quantum information system and gauge-theory model from the viewpoint of subsystem code, which is suitable for We studied the growth of an indium triple-atomic-layer film and the two-dimensional free-electron-like electronic states on Si(111) by low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), and angle-resolved photoelectron spectroscopy (ARPES). By depositing In on the In/Si(111…

Date of feed: Tue, 01 Aug 2023 03:17:06 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]+) **Photoaccelerated hot carrier transfer at ${\mathrm{MoS}}_{2}/{\mathrm{WS}}_{2}$: A first-principles study**

Zhi-Guo Tao, Guo-Jun Zhu, Weibin Chu, Xin-Gao Gong, and Ji-Hui Yang

Author(s): Zhi-Guo Tao, Guo-Jun Zhu, Weibin Chu, Xin-Gao Gong, and Ji-Hui Yang

[Phys. Rev. B 108, 014312] Published Mon Jul 31, 2023

**Discrete time crystal made of topological edge magnons**

Dhiman Bhowmick, Hao Sun, Bo Yang, and Pinaki Sengupta

Author(s): Dhiman Bhowmick, Hao Sun, Bo Yang, and Pinaki Sengupta

[Phys. Rev. B 108, 014434] Published Mon Jul 31, 2023

**Contrasting magnetic and magnetoelectric properties of $\mathrm{Lu}M\mathrm{W}{\mathrm{O}}_{6}\phantom{\rule{4pt}{0ex}}(M=\mathrm{Fe}$ and Cr): Role of spin frustration and noncollinear magnetic structure**

Swarnamayee Mishra, Premakumar Yanda, Fabio Orlandi, Pascal Manuel, Hyun-Joo Koo, Myung-Hwan Whangbo, and A. Sundaresan

Author(s): Swarnamayee Mishra, Premakumar Yanda, Fabio Orlandi, Pascal Manuel, Hyun-Joo Koo, Myung-Hwan Whangbo, and A. Sundaresan

[Phys. Rev. B 108, 014435] Published Mon Jul 31, 2023

**Disorder-induced excitation continuum in a spin-$\frac{1}{2}$ cobaltate on a triangular lattice**

Bin Gao, Tong Chen, Chien-Lung Huang, Yiming Qiu, Guangyong Xu, Jesse Liebman, Lebing Chen, Matthew B. Stone, Erxi Feng, Huibo Cao, Xiaoping Wang, Xianghan Xu, Sang-Wook Cheong, Stephen M. Winter, and Pengcheng Dai

Author(s): Bin Gao, Tong Chen, Chien-Lung Huang, Yiming Qiu, Guangyong Xu, Jesse Liebman, Lebing Chen, Matthew B. Stone, Erxi Feng, Huibo Cao, Xiaoping Wang, Xianghan Xu, Sang-Wook Cheong, Stephen M. Winter, and Pengcheng Dai

[Phys. Rev. B 108, 024431] Published Mon Jul 31, 2023

**Density of states of tight-binding models in the hyperbolic plane**

Rémy Mosseri and Julien Vidal

Author(s): Rémy Mosseri and Julien Vidal

[Phys. Rev. B 108, 035154] Published Mon Jul 31, 2023

**Conductance asymmetry in proximitized magnetic topological insulator junctions with Majorana modes**

Daniele Di Miceli, Eduárd Zsurka, Julian Legendre, Kristof Moors, Thomas L. Schmidt, and Llorenç Serra

Author(s): Daniele Di Miceli, Eduárd Zsurka, Julian Legendre, Kristof Moors, Thomas L. Schmidt, and Llorenç Serra

[Phys. Rev. B 108, 035424] Published Mon Jul 31, 2023

**Exciton spectrum in atomically thin monolayers: The role of hBN encapsulation**

Artur O. Slobodeniuk and Maciej R. Molas

Author(s): Artur O. Slobodeniuk and Maciej R. Molas

[Phys. Rev. B 108, 035427] Published Mon Jul 31, 2023

**Chiral topological metals with multiple types of quasiparticle fermions and large spin Hall effect in the SrGePt family materials**

Yi Shen, Yahui Jin, Yongheng Ge, Mingxing Chen, and Ziming Zhu

Author(s): Yi Shen, Yahui Jin, Yongheng Ge, Mingxing Chen, and Ziming Zhu

[Phys. Rev. B 108, 035428] Published Mon Jul 31, 2023

**Interplay between lattice gauge theory and subsystem codes**

Yoshihito Kuno and Ikuo Ichinose

Author(s): Yoshihito Kuno and Ikuo Ichinose*gaug…*

[Phys. Rev. B 108, 045150] Published Mon Jul 31, 2023

**Moiré superlattice and two-dimensional free-electron-like states of indium triple-layer structure on Si(111)**

Shinichiro Hatta, Kenta Kuroishi, Keisuke Yukawa, Tomoka Murata, Hiroshi Okuyama, and Tetsuya Aruga

Author(s): Shinichiro Hatta, Kenta Kuroishi, Keisuke Yukawa, Tomoka Murata, Hiroshi Okuyama, and Tetsuya Aruga

[Phys. Rev. B 108, 045427] Published Mon Jul 31, 2023

Found 2 papers in pr_res We use quantum entanglement witnesses derived from Gaussian operators to study the separable criteria of continuous variable states. For bipartite system, we transform the validity of a Gaussian witness to a bosonic Gaussian channel problem. It follows that the maximal means of two-mode and some fou… Simulating Hamiltonian dynamics is one of the most fundamental and significant tasks for characterizing quantum materials. Recently, a series of quantum algorithms employing block encoding of Hamiltonians have succeeded in providing efficient simulation of time-evolution operators on quantum compute…

Date of feed: Tue, 01 Aug 2023 03:17:06 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]+) **Bosonic Gaussian channel and Gaussian witness entanglement criterion of continuous variables**

Xiao-yu Chen, Maoke Miao, Rui Yin, and Jiantao Yuan

Author(s): Xiao-yu Chen, Maoke Miao, Rui Yin, and Jiantao Yuan

[Phys. Rev. Research 5, 033066] Published Mon Jul 31, 2023

**Optimal and nearly optimal simulation of multiperiodic time-dependent Hamiltonians**

Kaoru Mizuta

Author(s): Kaoru Mizuta

[Phys. Rev. Research 5, 033067] Published Mon Jul 31, 2023

Found 1 papers in comm-phys Communications Physics, Published online: 31 July 2023; doi:10.1038/s42005-023-01316-8**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]+) **Topological magnon-photon interaction for cavity magnonics**

Hyun-Woo Lee