Found 60 papers in cond-mat The phase space of a noncanonical Hamiltonian system is partially
inaccessible due to dynamical constraints (Casimir invariants) arising from the
kernel of the Poisson tensor. When an ensemble of noncanonical Hamiltonian
systems is allowed to interact, dissipative processes eventually break the
phase space constraints, resulting in an equilibrium described by a
Maxwell-Boltzmann distribution. However, the time scale required to reach
Maxwell-Boltzmann statistics is often much longer than the time scale over
which a given system achieves a state of thermal equilibrium. Examples include
diffusion in rigid mechanical systems, as well as collisionless relaxation in
magnetized plasmas and stellar systems, where the interval between binary
Coulomb or gravitational collisions can be longer than the time scale over
which stable structures are self-organized. Here, we focus on self-organizing
phenomena over spacetime scales such that particle interactions respect the
noncanonical Hamiltonian structure, but yet act to create a state of
thermodynamic equilibrium. We derive a collision operator for general
noncanonical Hamiltonian systems, applicable to fast, localized interactions.
This collision operator depends on the interaction exchanged by colliding
particles and on the Poisson tensor encoding the noncanonical phase space
structure, is consistent with entropy growth and conservation of particle
number and energy, preserves the interior Casimir invariants, reduces to the
Landau collision operator in the limit of grazing binary Coulomb collisions in
canonical phase space, and exhibits a metriplectic structure. We further show
how thermodynamic equilibria depart from Maxwell-Boltzmann statistics due to
the noncanonical phase space structure, and how self-organization and
collisionless relaxation in magnetized plasmas and stellar systems can be
described through the derived collision operator.
Unusual magnetotransport behaviors such as temperature dependent negative
magnetoresistance(MR) and bowtie-shaped MR have puzzled us for a long time.
Although several mechanisms have been proposed to explain them, the absence of
comprehensive quantitative calculations has made these explanations less
convincing. In our work, we introduce a methodology to study the
magnetotransport behaviors in magnetic materials. This approach integrates
anomalous Hall conductivity induced by Berry curvature, with a multi-band
ordinary conductivity tensor, employing a combination of first-principles
calculations and semi-classical Boltzmann transport theory. Our method
incorporates both the temperature dependency of relaxation time and anomalous
Hall conductivity, as well as the field dependency of anomalous Hall
conductivity. We initially test this approach on two-band models and then apply
it to a Weyl semimetal \CSS. The results, which align well with experimental
observations in terms of magnetic field and temperature dependencies,
demonstrate the efficacy of our approach. Additionally, we have investigated
the distinct behaviors of magnetoresistance (MR) and Hall resistivities across
various types of magnetic materials. This methodology provides a comprehensive
and efficient means to understand the underlying mechanisms of the unusual
behaviors observed in magneto-transport measurements in magnetic materials.
The Hall effect has been a fascinating topic ever since its discovery,
resulting in exploration of entire family of this intriguing phenomena. As the
field of topology develops and novel materials emerge endlessly over the past
few decades, researchers have been passionately debating the origins of various
Hall effects. Differentiating between the ordinary Hall effect and
extraordinary transport properties, like the anomalous Hall effect, can be
quite challenging, especially in high-conductivity materials, including those
with topological origins. In this study, we conduct a systematic and
comprehensive analysis of Hall effects by combining the semiclassical Boltzmann
transport theory with first principles calculations within the relaxation time
approximation. We first highlight some striking similarities between the
ordinary Hall effect and certain anomalous Hall effects, such as nonlinear
dependency on magnetic field and potential sign reversal of the Hall
resistivity. We then demonstrate that the Hall resistivity can be scaled with
temperature and magnetic field as well, analogue to the Kohler's rule which
scales the longitudinal resistivity under the relaxation time approximation. We
then apply this Kohler's rule for Hall resistivity to two representative
materials: ZrSiS and PtTe$_2$ with reasonable agreement with experimental
measurement. Moreover, our methodology has been proven to be applicable to the
planar Hall effects of bismuth, of perfect agreements with experimental
observations. Our research on the scaling behavior of Hall resistivity
addresses a significant gap in this field and provides a comprehensive
framework for a deeper understanding of the Hall resistance family, and thus
has potential to propel the field forward and spark further investigations into
the fascinating world of Hall effects.
The origin of anomalous resistivity peak and accompanied sign reversal of
Hall resistivity of ZrTe$_5$ has been under debate for a long time. Although
various theoretical models have been proposed to account for these intriguing
transport properties, a systematic study from first principles view is still
lacking. In this work, we present a first principles calculation combined with
Boltzmann transport theory to investigate the transport properties in
narrow-gap semiconductors at different temperatures and doping densities within
the relaxation time approximation. Regarding the sensitive
temperature-dependent chemical potential and relaxation time of semiconductors,
we take proper approximation to simulate these two variables, and then
comprehensively study the transport properties of ZrTe$_5$ both in the absence
and presence of an applied magnetic field. Without introducing topological
phases and correlation interactions, we qualitatively reproduced crucial
features observed in experiments, including zero-field resistivity anomaly,
nonlinear Hall resistivity with sign reversal, and non-saturating
magnetoresistance at high temperatures. Our calculation allows a systematic
interpretation of the observed properties in terms of multi-carrier and Fermi
surface geometry. Our method can be extended to other narrow-gap semiconductors
and further pave the way to explore interesting and novel transport properties
of this field.
Single- and two-particle spectra of a single immobile impurity immersed in a
fermionic bath can be computed exactly and are characterized by divergent power
laws (edge singularities). Here, we present the leading lattice correction to
this canonical problem, by embedding both impurity and bath fermions in bands
with non-vanishing Bloch band geometry, with the impurity band being flat. By
analyzing generic Feynman diagrams, we pinpoint how the band geometry reduces
the effective interaction which enters the power laws; we find that for weak
lattice effects or small Fermi momenta, the leading correction is proportional
to the Fermi energy times the sum of the quantum metrics of the bands. When
only the bath fermion geometry is important, the results can be extended to
large Fermi momenta and strong lattice effects. We numerically illustrate our
results on the Lieb lattice and draw connections to ultracold gas experiments.
The deformation mechanism in amorphous solids subjected to external shear
remains poorly understood because of the absence of well-defined topological
defects mediating the plastic deformation. The notion of soft spots has emerged
as a useful tool to characterize the onset of irreversible rearrangements and
plastic flow, but these entities are not well-defined in terms of geometry and
topology. In this study, we unveil the phenomenology of recently discovered,
well-defined topological defects governing the microscopic mechanical and
yielding behavior of a model 3D glass under shear deformation. We identify the
existence of vortex-like and anti-vortex-like topological defects within the 3D
non-affine displacement field. The number density of these defects exhibits a
significant (inverse) correlation with the plastic events, with defect
proliferation-annihilation cycles matching the alternation of elastic-like
segments and catastrophic plastic drops, respectively. Furthermore, we observe
collective annihilation of these point-like defects via plastic events, with
large local topological charge fluctuations in the vicinity of regions that
feature strong non-affine displacements. We unveil that plastic yielding is
driven by very few, but very large, clusters of net negative topological
charge, the massive annihilation of which triggers the onset of plastic flow.
These findings suggest a geometric and topological characterization of soft
spots and pave the way for the mechanistic understanding of topological defects
as mediators of plastic deformation in glassy materials.
We present a theoretical study of an exciton-polariton annular microcavity
with an additional quasiperiodic structure along the ring which is implemented
in the form of a bicosine dependence. We demonstrate that for a sufficiently
strong quasiperiodic modulation, the microcavity features a sharp mobility edge
separating a cluster of localized states from the rest of the spectrum
consisting of states extended over the whole ring. Localized modes can be
excited using a resonant pump whose topological charge determines the phase
distribution of excited patterns. Repulsive polariton interactions make the
resonance peaks distinctively asymmetric and enable the formation of
multistable states which feature the attractor-like dynamical behavior \rev{and
hysteresis}. We also demonstrate that the localized states can be realized in a
biannular cavity that consists of two rings, each having periodic modulation,
such that the periods of two modulations are different.
The present work reports the effect of adding Graphene Oxide (GO) and reduced
Graphene Oxide (rGO) in the corrosion protection provided by a water-borne
resin applied on a galvanized steel substrate. Three concentrations, 0.05, 0.1
and 0.15 (all wt%) were tested. The results were markedly affected not only by
the concentration of particles but also by their nature. Although the zeta
potential values suggested good dispersibility of the particles in the resin,
certain aggregation was observed, mainly in rGO 0.1 wt% and rGO 0.15 wt%
formulations. The electrochemical impedance spectroscopy (EIS) technique
characterised the free films' transport properties. The results suggested that
the aggregation strongly influenced the film morphology. The rGO 0.1 wt% and
rGO 0.15 wt% formulations exhibited percolating pores that facilitated the
electrolyte uptake through the films. The EIS technique was also used to study
the protective performance of the films when applied to the metallic substrate.
The results confirmed the harmful effect of the particle's aggregation. The
results were interesting for the rGO 0.05 wt% system, which displayed
long-lasting protection properties. This performance was explained considering
its good barrier properties and the zinc surface passivation by the generation
of zincite, ZnO.
Nanoscience at times can seem out of reach to the developing world and the
general public, with much of the equipment expensive and knowledge seemingly
esoteric to nonexperts. Using only cheap, everyday household items, accessible
research with real applications can be shown. Here, graphene suspensions were
produced using pencil lead, tap water, kitchen appliances, soaps and coffee
filters, with a childrens glue based graphene nanocomposite for highly
sensitive pulse measurements demonstrated.
The sub-nanometer distance between tip and sample in a scanning tunneling
microscope (STM) enables the application of very large electric fields with a
strength as high as ~ 1 GV/m. This has allowed for efficient electrical driving
of Rabi oscillations of a single spin on a surface at a moderate
radio-frequency (RF) voltage of the order of tens of millivolts. Here, we
demonstrate the creation of dressed states of a single electron spin localized
in the STM tunnel junction by using resonant RF driving voltages. The read-out
of these dressed states was achieved all-electrical by a weakly coupled probe
spin. Our work highlights the strength of the atomic-scale geometry inherent to
the STM that facilitates creation and control of dressed states, which are
promising for a design of atomically well-defined single spin quantum devices
on surfaces.
We grew needle-shaped single crystals of GdAgGe, which crystallizes in a
noncentrosymmetric hexagonal crystal structure with space group
P$\overline{6}$2$m$ (189). The magnetic susceptibility data for $H \perp c$
reveal two pronounced antiferromagnetic transitions at $T_{N1}$ = 20 K and
$T_{N2}$ = 14.5 K. The magnetic susceptibility anomalies are less prominent for
$H \parallel c$. The transition at $T_{N1}$ is accompanied by a pronounced heat
capacity anomaly confirming the bulk nature of the magnetic transition. Below
$T_{N1}$, the electrical resistivity data follows a $T^{3/2}$ dependence. In
the magnetically ordered state, GdAgGe shows positive transverse
magnetoresistance, which increases with decreasing temperature and increasing
field, reaching a value of $\sim$ 27% at 9 T and 10 K. The Hall resistivity
data and electronic band structure calculations suggest that both the hole and
electron charge carriers contribute to the transport properties. The electronic
band structure displays linear band crossings near the Fermi level. The
calculations reveal that GdAgGe has a nodal line with drumhead surface states
coupled with a nonzero Berry phase, making it a nontrivial nodal-line
semimetal.
Spintronic logic devices require efficient spin-charge interconversion:
converting charge current to spin current and spin current to charge current.
In spin-orbit materials that are regarded as the most promising candidate for
spintronic logic devices, one mechanism that is responsible for spin-charge
interconversion is Edelstein and inverse Edelstein effects based on
spin-momentum locking in materials with Rashba-type spin-orbit coupling. Over
last decade, there has been rapid progresses for increasing interconversion
efficiencies due to the Edelstein effect in a few Rashba-Dresselhaus materials
and topological insulators, making Rashba spin-momentum locking a promising
technological solution for spin-orbit logic devices. However, despite the rapid
progress that leads to high spin-charge interconversion efficiency at cryogenic
temperatures, the room-temperature efficiency needed for technological
applications is still low. This paper presents our understanding on the
challenges and opportunities in searching for Rashba-Dresselhaus materials for
efficient spin-charge interconversion at room temperature by focusing on
materials properties such as Rashba coefficients, momentum relaxation times,
spin-momentum locking relations and electrical conductivities.
Mass is commonly regarded as an intrinsic property of matter, but modern
physics shows that particle masses have complex origins . Elementary particles
acquire mass from couplings to other fields: most fermions and bosons receive
mass from the Higgs field, as well as other interactions (e.g., quarks gain
mass from interactions with gluons). In low-energy physics, quasiparticles
behaving like fundamental particles can arise in crystalline lattices, such as
relativistic Dirac quasiparticles in graphene. Mass can be imparted to these
quasiparticles by various lattice perturbations. By tailoring lattice
properties, we can explore otherwise-inacessible phenomena, such as how
particles behave when Hermiticity, the symmetry responsible for energy
conservation, is violated. Non-Hermiticity has long seemed incompatible with
mass generation; when Dirac points are subjected to energy-nonconserving
perturbations, they typically become exceptional points instead of opening a
mass gap. Here, we show experimentally that Dirac masses can be generated via
non-Hermiticity. We implement a photonic synthetic lattice with gain and loss
engineered to produce Dirac quasiparticles with real mass. By tuning this mass,
we demonstrate a crossover from conical to non-conical diffraction ,
topological boundary states between domains of opposite Dirac mass, and
anomalous tunneling into potential barriers.
The magnetic interactions in the antiferromagnetic (AFM) Dirac semimetal
candidate SrMnSb$_2$ are investigated using \textit{ab initio} linear response
theory and inelastic neutron scattering (INS). Our calculations reveal that the
first two nearest in-plane couplings ($J_1$ and $J_2$) are both AFM in nature,
indicating a significant degree of spin frustration, which aligns with
experimental observations. The orbital resolution of exchange interactions
shows that $J_1$ and $J_2$ are dominated by direct and superexchange,
respectively. In a broader context, a rigid-band model suggests that electron
doping fills the minority spin channel and results in a decrease in the AFM
coupling strength for both $J_1$ and $J_2$. To better compare with INS
experiments, we calculate the spin wave spectra within a linear spin wave
theory framework, utilizing the computed exchange parameters. The calculated
spin wave spectra exhibit overall good agreement with measurements from INS
experiments, although with a larger magnon bandwidth. Introducing additional
electron correlation within the Mn-$3d$ orbitals can promote electron
localization and reduce the magnetic coupling, further improving the agreement
with experiments.
Inspired by recent experimental synthesis of the two-dimensional Janus
material MoSH, we performed extensive first-principles calculations to
investigate the characteristics of all possible Janus two-dimensional
transition metal hydrosulfides (JTMSHs) in both the 2H and 1T phases. Our
investigations revealed that the JTMSHs can form a unique family of
two-dimensional materials with novel physical and chemical properties. We found
that JTMSHs can exist in different crystal states, exhibiting metallic,
semiconducting, and magnetic behaviors. One particularly intriguing finding is
the identification of two-dimensional electrodes with distinct bonding
characteristics in the 2H-JTMSHs (TM=V, Nb, Ta, Mo, W and Tc). Additionally, we
observed evidence of charge density wave (CDW) materials in 1T-JTMSH (TM=Tc,
Re, and W) and 2H-JTMSH (TM = Tc). Importantly, by applying a compressive
strain to these materials, the CDW can be completely suppressed and
superconductivities is hence induced. Specially, we shown that when subjected
to a compressive strain within 10%, the superconducting transition temperature
(Tc) of 1T-WSH, 1T-TcSH and 2H-TcSH can achieve maximum values of 13.8, 16.2
and 24.2 K respectively. Additionally, our investigation also unveiled two
intrinsic phonon-mediated superconductors 2H-WSH and 1T-RuSH with Tc of 17.0 K
and 8K, respectively. Overall, our results demonstrate that the family of
two-dimensional JTMSHs is full of surprises and holds great potential for
future exploration.
Co3Sn2S2 has been reported to be a Weyl semimetal with broken time-reversal
symmetry with c axis ferromagnetism (FM) below a Curie temperature of 177 K.
Despite the large interest in Co3Sn2S2, the magnetic structure is still under
debate and recent studies have challenged our understanding of the magnetic
phase diagram of Co3Sn2S2 by reporting unusual magnetic phases including the
presence of exchange bias. Understanding the magnetism of Co3Sn2S2 is important
since its electronic band structure including the much-celebrated flat bands
and Weyl nodes depend on the magnetic phase. In this work, using X-ray Magnetic
Circular Dichroism (XMCD), we establish that the magnetic moment in Co arises
from the spin, with negligible orbital moment. In addition, we detect an
in-plane AFM minority phase in the sea of a FM phase using spatially-resolved
angle-resolved photoemission spectroscopy ({\mu}-ARPES) combined with density
functional theory (DFT) calculation. Separately, we detect a sharp flat band
precisely at the Fermi level (EF) at some regions in the sample, which we
attribute to a surface state. The AFM phase survives even to the low
temperature of 6 K. This example of entirely different magnetic ground states
in a stoichiometric intermetallic invites further efforts to explore the
observed AFM phase and understand the origin and nature of the magnetic and
electronic inhomogeneity on the mesoscale and the interface between the AFM and
FM phases.
The Moir\'e patterns generated by altering the structural parameters in a two
or more layers of periodic materials, including single-layer structure,
interlayer stacking, and twisting parameters, exhibit prosperous topological
physical properties. However, the intricate characteristics of these Moir\'e
patterns and their relationship with topological transitions remain unclear. In
this Letter, based on the proposed twisted nested photonic crystal (TNPC), we
derive its spatial geometric functions (SGFs), aperiodic-quasiperiodic-periodic
characteristics of Moir\'e patterns, and the SSH{\phi} Hamiltonian. We reveal
the intrinsic correlation between Moir\'e patterns and topological transitions,
obtaining higher-order topological states (HOTSs) with C2z symmetry. This work
will provide theoretical references for the design and application of twisted
topological PC and their devices.
We theoretically investigate the thermal Hall transport of magnon-polarons in
a two-dimensional honeycomb antiferromagnetic insulator under the influence of
a perpendicular magnetic field, varying in strength. The application of a
perpendicular magnetic field induces a magnetic phase transition from the
collinear antiferromagnetic phase to the spin-flop phase, leading to a
significant alteration in Hall transport across the transition point. In this
paper, our focus is on the intrinsic contribution to thermal Hall transport
arising from the magnetoelastic interaction. To facilitate experimental
verification of our theoretical results, we present the dependence of thermal
Hall conductivity on magnetic field strength and temperature.
Criticality and symmetry, studied by the renormalization groups, lie at the
heart of modern physics theories of matters and complex systems. However,
surveying these properties with massive experimental data is bottlenecked by
the intolerable costs of computing renormalization groups on real systems.
Here, we develop a time- and memory-efficient framework, termed as the random
renormalization group, for renormalizing ultra-large systems (e.g., with
millions of units) within minutes. This framework is based on random
projections, hashing techniques, and kernel representations, which support the
renormalization governed by linear and non-linear correlations. For system
structures, it exploits the correlations among local topology in kernel spaces
to unfold the connectivity of units, identify intrinsic system scales, and
verify the existences of symmetries under scale transformation. For system
dynamics, it renormalizes units into correlated clusters to analyze scaling
behaviours, validate scaling relations, and investigate potential criticality.
Benefiting from hashing-function-based designs, our framework significantly
reduces computational complexity compared with classic renormalization groups,
realizing a single-step acceleration of two orders of magnitude. Meanwhile, the
efficient representation of different kinds of correlations in kernel spaces
realized by random projections ensures the capacity of our framework to capture
diverse unit relations. As shown by our experiments, the random renormalization
group helps identify non-equilibrium phase transitions, criticality, and
symmetry in diverse large-scale genetic, neural, material, social, and
cosmological systems.
This work delves into the energy localization in non-Hermitian systems,
particularly focusing on the effects of topological defects in spherical
models. We analyze the mode distribution changes in non-Hermitian
Su-Schrieffer-Heeger (SSH) chains impacted by defects, utilizing the Maximum
Skin Corner Weight (MaxWSC). By introducing an innovative spherical model,
conceptualized through bisecting spheres into one-dimensional chain structures,
we investigate the non-Hermitian skin effect (NHSE) in a new dimensional
context, venturing into the realm of non-Euclidean geometry. Our experimental
validations on Printed Circuit Boards (PCBs) confirm the theoretical findings.
Collectively, these results not only validate our theoretical framework but
also demonstrate the potential of engineered circuit systems to emulate complex
non-Hermitian phenomena, showcasing the applicability of non-Euclidean
geometries in studying NHSE and topological phenomena in non-Hermitian systems.
Vortices and bound states offer an effective means of comprehending the
electronic properties of superconductors. Recently, surface dependent vortex
core states have been observed in the newly discovered kagome superconductors
CsV3Sb5. Although the spatial distribution of the sharp zero energy conductance
peak appears similar to Majorana bound states arising from the superconducting
Dirac surface states, its origin remains elusive. In this study, we present
observations of tunable vortex bound states (VBSs) in two chemically doped
kagome superconductors Cs(V1-xTrx)3Sb5 (Tr=Ta or Ti), using low temperature
scanning tunneling microscopy/spectroscopy. The CsV3Sb5-derived kagome
superconductors exhibit full gap pairing superconductivity accompanied by the
absence of long range charge orders, in contrast to pristine CsV3Sb5. Zero
energy conductance maps demonstrate a field-driven continuous reorientation
transition of the vortex lattice, suggesting multiband superconductivity. The
Ta doped CsV3Sb5 displays the conventional cross shaped spatial evolution of
Caroli de Gennes Matricon bound states, while the Ti doped CsV3Sb5 exhibits a
sharp, non split zero bias conductance peak (ZBCP) that persists over a long
distance across the vortex. The spatial evolution of the non split ZBCP is
robust against surface effects and external magnetic field but is related to
the doping concentrations. Our study reveals the tunable VBSs in multiband
chemically doped CsV3Sb5 system and offers fresh insights into previously
reported Y shaped ZBCP in a non quantum limit condition at the surface of
kagome superconductor.
Deep generative models complement Markov-chain-Monte-Carlo methods for
efficiently sampling from high-dimensional distributions. Among these methods,
explicit generators, such as Normalising Flows (NFs), in combination with the
Metropolis Hastings algorithm have been extensively applied to get unbiased
samples from target distributions. We systematically study central problems in
conditional NFs, such as high variance, mode collapse and data efficiency. We
propose adversarial training for NFs to ameliorate these problems. Experiments
are conducted with low-dimensional synthetic datasets and XY spin models in two
spatial dimensions.
The identification of the topological invariant of a topological system is
crucial in experiments. However, due to the inherent non-Hermitian features,
such determination is notably challenging in non-Hermitian systems. Here, we
propose that the magnetic effect can be utilized to measure the Chern number of
the non-Hermitian Chern insulator. We find that the splitting of non-Hermitian
bands under the magnetic field is Chern number dependent. Consequently, one can
easily identify the Chern number by analyzing these splitting sub-bands. From
the experimental perspective, the measurement of non-Hermitian bands is
demonstrated in LC electric circuits. Furthermore, we find that the
non-Hermiticity can drive open (closed) orbits of sub-bands in the Hermitian
limit closed (open), which can also be identified by our proposal. These
phenomena highlight the distinctive capabilities of non-Hermitian systems. Our
results facilitate the detection of Chern numbers for non-Hermitian systems and
may motivate further studies of their topological properties.
In recent years, synthesis and experimental research of fractalized materials
has evolved in a paradigmatic crossover with topological phases of matter. We
present here a theoretical investigation of the helical edge transport in
Sierpinski carpets (SCs), combining the Bernevig-Hughes-Zhang (BHZ) model and
the Landauer approach. Starting from a pristine two-dimensional topological
insulator (2DTI), according to the BHZ model, our results reveal resonant
transport modes when the SC fractal generation reaches the same scale as the
space discretization; these modes are analyzed within a contour plot mapping of
the local spin-polarized currents, shown spanned and assisted by inner-edge
channels. From such a deeply fractalized SC building block, we introduce a rich
tapestry formed by superior SC hierarchies, enlightening intricate patterns and
unique fingerprints that offer valuable insights into how helical edge
transport occurs in these fractal dimensions.
The local atomic structure and lattice dynamics of two isostructural layered
transition metal dichalcogenides (TMDs), 1T-TiSe$_2$ and 1T-VSe$_2$, were
studied using temperature-dependent X-ray absorption spectroscopy at the Ti, V,
and Se K-edges. Analysis of the extended X-ray absorption fine structure
(EXAFS) spectra, employing reverse Monte Carlo (RMC) simulations, enabled
tracking the temperature evolution of the local environment in the range of
10-300 K. The atomic coordinates derived from the final atomic configurations
were used to calculate the partial radial distribution functions (RDFs) and the
mean-square relative displacement (MSRD) factors for the first ten coordination
shells around the absorbing atoms. Characteristic Einstein frequencies and
effective force constants were determined for Ti-Se, Ti-Ti, V-Se, V-V, and
Se-Se atom pairs from the temperature dependencies of MSRDs. The obtained
results reveal differences in the temperature evolution of lattice dynamics and
the strengths of intralayer and interlayer interactions in TiSe$_2$ and
VSe$_2$.
Ferroelectric materials with switchable electric polarization hold great
promise for a plethora of emergent applications, such as post-Moore's law
nanoelectronics, beyond-Boltzmann transistors, non-volatile memories, and
above-bandgap photovoltaic devices. Recent advances have uncovered an exotic
sliding ferroelectric mechanism, which endows to design atomically thin
ferroelectrics from non-ferroelectric parent monolayers. Although notable
progress has been witnessed in understanding its fundamental properties,
functional devices based on sliding ferroelectrics, the key touchstone toward
applications, remain elusive. Here, we demonstrate the rewritable, non-volatile
memory devices at room-temperature utilizing a two-dimensional (2D) sliding
ferroelectric semiconductor of rhombohedral-stacked bilayer molybdenum
disulfide. The 2D sliding ferroelectric memories (SFeMs) show superior
performances with a large memory window of >8V, a high conductance ratio of
above 106, a long retention time of >10 years, and a programming endurance
greater than 104 cycles. Remarkably, flexible SFeMs are achieved with
state-of-the-art performances competitive to their rigid counterparts and
maintain their performances post bending over 103 cycles. Furthermore,
synapse-specific Hebbian forms of plasticity and image recognition with a high
accuracy of 97.81% are demonstrated based on flexible SFeMs. Our work
demonstrates the sliding ferroelectric memories and synaptic plasticity on both
rigid and flexible substrates, highlighting the great potential of sliding
ferroelectrics for emerging technological applications in brain-inspired
in-memory computing, edge intelligence and energy-efficient wearable
electronics.
Molybdenum disulfide (MoS2) has drawn great interest for tunable photonics
and optoelectronics advancement. Its solution processing, though scalable,
results in randomly networked ensembles of discrete nanosheets with compromised
properties for tunable device fabrication. Here, we show via density-functional
theory calculations that the electronic structure of the individual
solution-processed nanosheets can be modulated by external electric fields
collectively. Particularly, the nanosheets can form Stark ladders, leading to
variations in the underlying optical transition processes and thus, tunable
macroscopic optical properties of the ensembles. We experimentally confirm the
macroscopic electro-optical modulation employing solution-processed thin-films
of MoS2 and ferroelectric P(VDF-TrFE), and prove that the localized
polarization fields of P(VDF-TrFE) can modulate the optical properties of MoS2,
specifically, the optical absorption and photoluminescence on a macroscopic
scale. Given the scalability of solution processing, our results underpin the
potential of electro-optical modulation of solution-processed MoS2 for scalable
tunable photonics and optoelectronics. As an illustrative example, we
successfully demonstrate solution-processed electro-absorption modulators.
We study interaction-mediated magnetism on the surface of ABC-multilayer
graphene driven by its zero-energy topological flat bands. Using the
random-phase approximation we treat onsite Hubbard repulsion and find multiple
competing magnetic states, due to both intra- and inter-valley scattering, with
the latter causing an enlarged magnetic unit cell. At half-filling and when the
Hubbard repulsion is weak, we observe two different ferromagnetic orders. Once
the Hubbard repulsion becomes more realistic, new ferrimagnetic orders arise
with distinct incommensurate intra- or inter-valley scattering vectors
depending on interaction strength and doping, leading to a multitude of
competing magnetic states.
By analogy with the Ginzburg-Landau theory of multi-band superconductors with
inner (interband) Josephson couplings we formulate the three-band
Glashow-Weinberg-Salam model with weak Josephson couplings between strongly
asymmetrical condensates of scalar (Higgs) fields. Unlike usual single-band
model, we found three Higgs bosons corresponding to three generations of
particles, moreover the heaviest of them corresponds to the already discovered
H-boson from the single-band theory and decay into fermions of only the third
generation. The other two decay into fermions of the first and second
generations accordingly, but they are difficult to observe due to very poor
conditions for production. We found two sterile ultra-light Leggett bosons, the
Bose condensates of which form the dark halos of galaxies and their clusters
(i.e so called "dark matter"). The masses of the Leggett bosons are determined
by the coefficient of the interband coupling and can be arbitrarily small
($\sim 10^{-20}\mathrm{eV}$) due to non-perturbativeness of the interband
coupling. Since propagation of Leggett bosons is not accompanied by current,
these bosons are not absorbed by gauge fields unlike the common-mode Goldstone
bosons. Three coupled condensates of the scalar fields causes the existence of
three generations of leptons, where each generation interacts with the
corresponding condensate getting mass. The interflavour mixing between the
generations of active neutrinos and sterile right-handed neutrinos in the
three-band system causes the existence of mass states of neutrino without
interaction with the Higgs condensates.
We present a theoretical study of the intrinsic plasmonic properties of
twisted bilayer graphene (TBG) as a function of the twist angle $\theta$ (and
other microscopic parameters such as temperature and filling factor). Our
calculations, which rely on the random phase approximation, take into account
four crucially important effects, which are treated on equal footing: i) the
layer-pseudospin degree of freedom, ii) spatial non-locality of the
density-density response function, iii) crystalline local field effects, and
iv) Hartree self-consistency. We show that the plasmonic spectrum of TBG
displays a smooth transition from a strongly-coupled regime (at twist angles
$\theta \lesssim 2^{\circ}$), where the low-energy spectrum is dominated by a
weakly dispersive intra-band plasmon, to a weakly-coupled regime (for twist
angles $\theta \gtrsim 2^{\circ}$) where an acoustic plasmon clearly emerges.
This crossover offers the possibility of realizing tunable mid-infrared
sub-wavelength cavities, whose vacuum fluctuations may be used to manipulate
the ground state of strongly correlated electron systems.
A quantized Hall conductance (not conductivity) in three dimensions has been
searched for more than 30 years. Here we explore it in 3D topological
nodal-line semimetals, by using a model capable of describing all essential
physics of a semimetal, in particular the drumhead surface states protected by
a momentum-dependent winding number. We develop a microscopic theory to
demonstrate that the drumhead surface states can host quantized Hall
conductance in this 3D material. We stress that breaking chiral symmetry is
necessary for the quantum Hall effect of the drumhead surface states. The
analytic theory can be verified numerically by the Kubo formula. There may also
be trivial quantum Hall effects from the bulk states. We propose an
experimental setup to distinguish the surface and bulk quantum Hall effects.
The theory will be useful for ongoing explorations on nodal-line semimetals.
Frieze groups are discrete subgroups of the full group of isometries of a
flat strip. We investigate here the dynamics of specific architected materials
generated by acting with a frieze group on a collection of self-coupling seed
resonators. We demonstrate that, under unrestricted reconfigurations of the
internal structures of the seed resonators, the dynamical matrices of the
materials generate the full self-adjoint sector of the stabilized group
$C^\ast$-algebra of the frieze group. As a consequence, in applications where
the positions, orientations and internal structures of the seed resonators are
adiabatically modified, the spectral bands of the dynamical matrices carry a
complete set of topological invariants that are fully accounted by the K-theory
of the mentioned algebra. By resolving the generators of the K-theory, we
produce the model dynamical matrices that carry the elementary topological
charges, which we implement with systems of plate resonators to showcase
several applications in spectral engineering. The paper is written in an
expository style.
In 1992, Kennedy and Tasaki constructed a non-local unitary transformation
that maps between a $\mathbb{Z}_2\times \mathbb{Z}_2$ spontaneously symmetry
breaking phase and the Haldane gap phase, which is a prototypical
Symmetry-Protected Topological phase in modern framework, on an open spin
chain. In this work, we propose a way to define it on a closed chain, by
sacrificing unitarity. The operator realizing such a non-unitary transformation
satisfies non-invertible fusion rule, and implements a generalized gauging of
the $\mathbb{Z}_2\times \mathbb{Z}_2$ global symmetry. These findings connect
the Kennedy-Tasaki transformation to numerous other concepts developed for SPT
phases, and opens a way to construct SPT phases systematically using the
duality mapping.
We study the incoherent transport of bosonic particles through a one
dimensional lattice with different left and right hopping rates, as modelled by
the asymmetric simple inclusion process (ASIP). Specifically, we show that as
the current passing through this system increases, a transition occurs, which
is signified by the appearance of a characteristic zigzag pattern in the
stationary density profile near the boundary. In this highly unusual transport
phase, the local particle distribution alternates on every site between a
thermal distribution and a Bose-condensed state with broken U(1)-symmetry.
Furthermore, we show that the onset of this phase is closely related to the
so-called non-Hermitian skin effect and coincides with an exceptional point in
the spectrum of density fluctuations. Therefore, this effect establishes a
direct connection between quantum transport, non-equilibrium condensation
phenomena and non-Hermitian topology, which can be probed in cold-atom
experiments or in systems with long-lived photonic, polaritonic and plasmonic
excitations.
Type-II Dirac semimetals (DSMs) have a distinct Fermi surface topology, which
allows them to host novel topological superconductivity (TSC) different from
type-I DSMs. Depending on the relationship between intra- and inter-orbital
electron-electron interactions, the phase diagram of superconductivity is
obtained in type-II DSMs. We find that when the inter-orbital attraction is
dominant, an unconventional inter-orbital intra-spin superconducting (SC) state
($B_{1u}$ and $B_{2u}$ pairing channels of $D_{4h}$ point group) is realized,
yielding hybrid TSC, i.e., first- and second-order TSC exists at the same time.
Further analysis reveals the Majorana flat bands on the $z$-directed hinges,
which penetrate through the whole hinge Brillouin zone and link the projections
of the surface helical Majorana cones at time-reversal-invariant momenta. These
higher-order hinge modes are symmetry-protected and can even host strong
stability against finite $C_{4z}$ rotation symmetry-breaking order. We suggest
that experimental realization of these findings can be explored in transition
metal dichalcogenides.
The charge density wave (CDW) state of 2H-NbSe$_2$ features commensurate
domains separated by domain boundaries accompanied by phase slips known as
discommensurations. We have unambiguously visualized the structure of CDW
domains using a displacement-field measurement algorithm on a scanning
tunneling microscopy image. Each CDW domain is delimited by three vertices and
three edges of discommensurations and is designated by a triplet of integers
whose sum identifies the types of commensurate structure. The observed
structure is consistent with the alternating triangular tiling pattern
predicted by a phenomenological Landau theory. The domain shape is affected by
crystal defects and also by topological defects in the CDW phase factor. Our
results provide a foundation for a complete understanding of the CDW state and
its relation to the superconducting state.
Mechanical properties of crystals on curved substrates mix elastic, geometric
and topological degrees of freedom. In order to elucidate properties of such
crystals we formulate the low-energy effective action that combines metric
degrees of freedom with displacement fields and defects. We propose new
dualities for elasticity coupled to curved geometry formulated in terms of
tensor gauge theories. We show that the metric degrees of freedom, evolving
akin to linearized gravity are mapped to tensors with three indices. When
coupled to crystals these degrees of freedom become gapped and, in the presence
of dislocations and disclinations, multivalued. The elastic degrees of freedom
remain gapless and mapped to symmetric gauge fields with two indices. In
analogy with elasticity on flat space formulation we assume that the trace of
the total quadrupole moment is conserved. In the dual formulation, topological
defects, which act as sources for the gauge fields, are fractons or excitations
with restricted mobility. This leads to a generalized glide constraints that
restrict both displacement and gravitational defects.
In this work, we study and evaluate the impact of a periodic spin-lattice
coupling in an Ising-like system on a 2D triangular lattice. Our proposed
simple Hamiltonian considers this additional interaction as an effect of
preferential phonon propagation direction augmented by the symmetry ofthe
underline lattice. The simplified analytical description of this new model
brought us consistent information about its ground state and thermal behavior,
and allowed us to highlight a singularity where the model behaves as several
decoupled one-dimensional Ising systems. A thorough analysis was obtained via
entropic simulations based in the Wang-Landau method that estimates the density
of states g(E) to explore the phase diagram and other thermodynamic properties
of interest. Also, we used the finite size scaling technique to characterize
the critical exponents and the nature of the phase transitions that, despite
the strong influence of the spin-lattice coupling, turned out to be within the
same universality class as the original 2D Ising model.
There is a version of the Landau-Lifshitz equation that takes into account
the Coulomb exchange interactions between atoms, expressed by the term
$\sim\bm{s}\times\triangle\bm{s}$. On the other hand, ions in the magnetic
materials have several valence electrons on the $d$-shell, and therefore the
Hamiltonian of many-electron atoms with spins $S>1$ should include a
biquadratic exchange interaction. We first propose a new fundamental
microscopic derivation of the spin density evolution equation with an explicit
form of biquadratic exchange interaction using the method of many-particle
quantum hydrodynamics. The equation for the evolution of the spin density is
obtained from the many-particle Schrodinger-Pauli equation and contains the
contributions of the usual Coulomb exchange interaction and the biquadratic
exchange. Furthermore, the derived biquadratic exchange torque in the spin
density evolution equation is proportional to the nematic tensor for the medium
of atoms with spin $\textit{S = 1}$. Our method may be very attractive for
further studies of the magnetoelectric effect in multiferroics.
Magnetostriction drives a rhombohedral distortion in the cubic rock salt
antiferromagnet MnO at the N\'eel temperature $T_{N}=118$ K. As an unexpected
consequence we show that this distortion acts to localize the site of an
implanted muon due to the accompanying redistribution of electron density. This
lifts the degeneracy between equivalent sites, resulting in a single observed
muon precession frequency. Above $T_{N}$, the muon instead becomes delocalized
around a network of equivalent sites. Our first-principles simulations based on
Hubbard-corrected density-functional theory and molecular dynamics are
consistent with our experimental data and help to resolve a long-standing
puzzle regarding muon data on MnO, as well as having wider applicability to
other magnetic oxides.
We study a Kondo state that is strongly influenced by its proximity to an
w^-1/2 singularity in the metallic host density of states. This singularity
occurs at the bottom of the band of a 1D chain, for example. We first analyze
the non-interacting system: A resonant state e_d, located close to the band
singularity, suffers a strong `renormalization', such that a bound state is
created below the bottom of the band in addition to a resonance in the
continuum. When e_d is positioned right at the singularity, the spectral weight
of the bound state is 2/3, irrespective of its coupling to the conduction
electrons. The interacting system is modeled using the Single Impurity Anderson
Model, which is then solved using the Numerical Renormalization Group method.
We observe that the Hubbard interaction causes the bound state to suffer a
series of transformations, including level splitting, transfer of spectral
weight, appearance of a spectral discontinuity, changes in binding energy (the
lowest state moves farther away from the bottom of the band), and development
of a finite width. When e_d is away from the singularity and in the
intermediate valence regime, the impurity occupancy is lower. As e_d moves
closer to the singularity, the system partially recovers Kondo regime
properties, i.e., higher occupancy and lower Kondo temperature T_K. The
impurity thermodynamic properties show that the local moment fixed point is
also strongly affected by the existence of the bound state. When e_d is close
to the singularity, the local moment fixed point becomes impervious to charge
fluctuations (caused by bringing e_d close to the Fermi energy), in contrast to
the local moment suppression that occurs when e_d is away from the singularity.
We also discuss an experimental implementation that shows similar results to
the quantum wire, if the impurity's metallic host is an armchair graphene
nanoribbon.
Magnetic materials with highly anisotropic chemical bonding can be exfoliated
to realize ultrathin sheets or interfaces with highly controllable optical or
spintronics responses, while also promising novel cross-correlation phenomena
between electric polarization and the magnetic texture. The vast majority of
these van-der-Waals magnets are collinear ferro-, ferri-, or antiferromagnets,
with a particular scarcity of lattice-incommensurate helimagnets of defined
left- or right-handed rotation sense, or helicity. Here we use polarized
neutron scattering to reveal cycloidal, or conical, magnetic structures in
DyTe$_3$, with coupled commensurate and incommensurate order parameters, where
covalently bonded double-slabs of dysprosium square nets are separated by
highly metallic tellurium layers. Based on this ground state and its evolution
in a magnetic field as probed by small-angle neutron scattering (SANS), we
establish a one-dimensional spin model with off-diagonal on-site terms,
spatially modulated by the unconventional charge order in DyTe$_3$. The
CDW-driven term couples to antiferromagnetism, or to the net magnetization in
applied magnetic field, and creates a complex magnetic phase diagram indicative
of competing interactions in an easily cleavable helimagnet. Our work paves the
way for twistronics research, where helimagnetic layers can be combined to form
complex spin textures on-demand, using the vast family of rare earth
chalcogenides and beyond.
The deconfined quantum critical point (DQCP) is an example of phase
transitions beyond the Landau symmetry breaking paradigm that attracts wide
interest. However, its nature has not been settled after decades of study. In
this paper, we apply the recently proposed fuzzy sphere regularization to study
the $\mathrm{SO}(5)$ non-linear sigma model (NL$\sigma$M) with a topological
Wess-Zumino-Witten term, which serves as a dual description of the DQCP with an
exact $\mathrm{SO}(5)$ symmetry. We demonstrate that the fuzzy sphere functions
as a powerful microscope, magnifying and revealing a wealth of crucial
information about the DQCP, ultimately paving the way towards its final answer.
In particular, through exact diagonalization, we provide clear evidence that
the DQCP exhibits approximate conformal symmetry. The evidence includes the
existence of a conserved $\mathrm{SO}(5)$ symmetry current, a stress tensor,
and integer-spaced levels between conformal primaries and their descendants.
Most remarkably, we have identified 23 primaries and 76 conformal descendants.
Furthermore, by examining the renormalization group flow of the lowest symmetry
singlet as well as other primaries, we provide numerical evidence in favour of
DQCP being pseudo-critical, with the approximate conformal symmetry plausibly
emerging from nearby complex fixed points. The primary spectrum we compute also
has important implications, including the conclusion that the $\mathrm{SO}(5)$
DQCP cannot describe a direct transition from the N\'eel to valence bond solid
phase on the honeycomb lattice.
We investigate quantum transport through a rectangular potential barrier in
Weyl semimetals (WSMs) and multi-Weyl semimetals (MSMs), within the framework
of Landauer-B\"uttiker formalism. Our study uncovers the role of nodal topology
imprinted in the electric current and the shot noise. We find that, in contrast
to the finite odd-order conductance and noise power, the even-order
contributions vanish at the nodes. Additionally, depending on the topological
charge ($J$), the linear conductance ($G_1$) scales with the Fermi energy
($E_F$) as $G_1^{E_F>U}\propto E_F^{2/J}$. We demonstrate that the
$E_F$-dependence of the second-order conductance and shot noise power could
quite remarkably distinguish an MSM from a WSM depending on the band topology,
and may induce several smoking gun experiments in nanostructures made out of
WSMs and MSMs. Analyzing shot noise and Fano factor, we show that the transport
across the rectangular barrier follows the sub-Poissonian statistics.
Interestingly, we obtain universal values of Fano factor at the nodes unique to
their topological charges. The universality for a fixed $J$, however, indicates
that only a fixed number of open channels participate in the transport through
evanescent waves at the nodes. The proposed results can serve as a potential
diagnostic tool to identify different topological systems in experiments.
Two recent preprints in the physics archive (arXiv) have called attention as
they claim experimental evidence that a Cu-substituted apatite material (dubbed
LK-99) exhibits superconductivity at room temperature and pressure. If this
proves to be true, LK-99 will be a "holy grail" of superconductors. In this
work, we used Density Functional Theory (DFT+U) calculations to elucidate some
key features of the electronic structure of LK-99. We find two different phases
of this material: (i) a hexagonal lattice featuring metallic half-filled and
spin-split bands, an {apparent nesting} of the Fermi surface, a remarkably
large electron-phonon coupling, but this lattice is vibrationally unstable.
(ii) A triclinic lattice, with the Cu and surrounding O distorted. This lattice
is vibrationally stable and its bands correspond to an insulator. In a crystal,
the Cu atoms should oscillate between equivalent triclinic positions, with an
average close to the hexagonal positions. We discuss the electronic structure
expected from these fluctuations and if it is compatible with
superconductivity.
This paper develops approximate message passing algorithms to optimize
multi-species spherical spin glasses. We first show how to efficiently achieve
the algorithmic threshold energy identified in our companion work, thus
confirming that the Lipschitz hardness result proved therein is tight. Next we
give two generalized algorithms which produce multiple outputs and show all of
them are approximate critical points. Namely, in an $r$-species model we
construct $2^r$ approximate critical points when the external field is stronger
than a "topological trivialization" phase boundary, and exponentially many such
points in the complementary regime. We also compute the local behavior of the
Hamiltonian around each. These extensions are relevant for another companion
work on topological trivialization of the landscape.
We put forth a theoretical framework for engineering a two-dimensional (2D)
second-order topological superconductor (SOTSC) by utilizing a heterostructure:
incorporating noncollinear magnetic textures between an $s$-wave superconductor
and a 2D quantum spin Hall insulator. It stabilizes the higher order
topological superconducting phase, resulting in Majorana corner modes (MCMs) at
four corners of a 2D domain. The calculated non-zero quadrupole moment
characterizes the bulk topology. Subsequently, through a unitary
transformation, an effective low-energy Hamiltonian reveals the effects of
magnetic textures, resulting in an effective in-plane Zeeman field and
spin-orbit coupling. This approach provides a qualitative depiction of the
topological phase, substantiated by numerical validation within exact
real-space model. Analytically calculated effective pairings in the bulk
illuminate the microscopic behavior of the SOTSC. The comprehension of MCM
emergence is supported by a low-energy edge theory, which is attributed to the
interplay between effective pairings of $(p_x + p_y)$-type and $(p_x + i
p_y)$-type. Our extensive study paves the way for practically attaining the
SOTSC phase by integrating noncollinear magnetic textures.
We investigate the elastic energy stored in a filament pair as a function of
applied twist by measuring torque under prescribed end-to-end separation
conditions. We show that the torque increases rapidly to a peak with applied
twist when the filaments are initially separate, then decreases to a minimum as
the filaments cross and come into contact. The torque then increases again
while the filaments form a double helix with increasing twist. A nonlinear
elasto-geometric model that combines the effect of geometrical nonlinearities
with large stretching and self-twist is shown to capture the evolution of the
helical geometry, the torque profile, and the stored energy with twist. We find
that a large fraction of the total energy is stored in stretching the
filaments, which increases with separation distance and applied tension. We
find that only a small fraction of energy is stored in the form of bending
energy, and that the contribution due to contact energy is negligible. Our
study highlights the consequences of stretchablility on filament twisting which
is a fundamental topological transformation relevant to making ropes, tying
shoelaces, actuating robots, and the physical properties of entangled polymers.
We study the impact of atomic interactions on an in-situ collimation method
for matter-waves. Building upon an earlier study with $^{87}$Rb, we apply a
lensing protocol to $^{39}$K where the atomic scattering length can be tailored
by means of magnetic Feshbach resonances. Minimizing interactions, we show an
enhancement of the collimation compared to the strong interaction regime
observing a one-dimensional expansion corresponding to (340 $\pm$ 12) pK in our
experiment. Our results are supported by an accurate simulation, describing the
ensemble dynamics, which allows us to extrapolate a 2D ballistic expansion
energy of (438 $\pm$ 77) pK from our measurements. We further use the
simulation to study the behavior of various trap configurations for different
interaction strengths. Based on our findings we propose an advanced scenario
which allows for 3D expansion energies below 16 pK by implementing an
additional pulsed delta-kick collimation directly after release from the
trapping potential. Our results pave the way to realize ensembles with hundreds
of thousands of particles and 3D expansion energies in the two-digit pK range
in typical dipole trap setups required to perform ultra-precise measurements
without the need of complex micro-gravity or long-baseline environments.
Active solids such as cell collectives, colloidal clusters, and active
metamaterials exhibit diverse collective phenomena, ranging from rigid body
motion to shape-changing mechanisms. The nonlinear dynamics of such active
materials remains however poorly understood when they host zero-energy
deformation modes and when noise is present. Here, we show that stress
propagation in a model of active solids induces the spontaneous actuation of
multiple soft floppy modes, even without exciting vibrational modes. By
introducing an adiabatic approximation, we map the dynamics onto an effective
Landau free energy, predicting mode selection and the onset of collective
dynamics. These results open new ways to study and design living and robotic
materials with multiple modes of locomotion and shape-change.
We develop the theoretical formalism and study the formation of valley trions
in transition metal dichalcogenide (TMDC) monolayers within the framework of a
nonrelativistic potential model using the method of hyperspherical harmonics
(HH) in four-dimensional space. We present the solution of the three-body
Schr\"{o}dinger equation with the Rytova-Keldysh (RK) potential by expanding
the wave function of a trion in terms of the HH. The antisymmetrization of
trions wave function is based on the electron and hole spin and valley indices.
We consider a long-range approximation when the RK potential is approximated
by the Coulomb potential and a short-range limit when this potential is
approximated by the logarithmic potential. In a diagonal approximation, the
coupled system of differential equations for the hyperradial functions is
decoupled in both limits. Our approach yields the analytical solution for
binding energy and wave function of trions in the diagonal approximation for
these two limiting cases: the Coulomb and logarithmic potentials. We obtain
exact analytical expressions for eigenvalues and eigenfunctions for negatively
and positively charged trions. The corresponding energy eigenvalues can be
considered as the lower and upper limits for the trions binding energies.
The proposed theoretical approach can describe trions in TMDCs and address
the energy difference between the binding energies of $X^{-}$ and $X^{+}$ in
TMDC. Results of numerical calculations for the ground state energies with the
RK potential are in good agreement with similar calculations and in reasonable
agreement with experimental measurements of trion binding energies.
We study thermodynamics of a heat-conducting ideal gas system, incorporating
a model that has a temperature upper bound. We construct the model based on i)
the first law of thermodynamics from action formulation which shows
heat-dependence of energy density and ii) the existence condition of a (local)
Lorentz boost between an Eckart observer and a Landau-Lifschitz observer--a
condition that extends the stability criterion of thermal equilibrium. The
implications of these conditions include: i) Heat contributes to the energy
density through the combination $q/n\Theta^2$ where $q$, $n$, and $\Theta$
represent heat, the number density, and the temperature, respectively. ii) The
energy density has a unique minimum at $q=0$. iii) The temperature upper bound
suppresses the heat dependence of the energy density inverse quadratically.
This result explains why the expected heat dependence of energy density is
difficult to observe in ordinary situation thermodynamics.
This perspective article reviews arguments that glass-forming liquids are
different from those of standard liquid-state theory, which typically have a
viscosity in the mPa$\cdot$s range and relaxation times of order picoseconds.
These numbers grow dramatically and become $10^{12}-10^{15}$ times larger for
liquids cooled toward the glass transition. This translates into a qualitative
difference, and below the ``solidity length'' which is of order one micron at
the glass transition, a glass-forming liquid behaves much like a solid. Recent
numerical evidence for the solidity of ultraviscous liquids is reviewed, and
experimental consequences are discussed in relation to dynamic heterogeneity,
frequency-dependent linear-response functions, and the temperature dependence
of the average relaxation time.
Weyl semimetal, which does not require any symmetry except translation for
protection, is a robust gapless state of quantum matters in three dimensions.
When translation symmetry is preserved, the only way to destroy a Weyl
semimetal state is to bring two Weyl nodes of opposite chirality close to each
other to annihilate pairwise. An external magnetic field can destroy a pair of
Weyl nodes (which are separated by a momentum space distance $2k_0$) of
opposite chirality, when the magnetic length $l_B$ becomes close to or smaller
than the inverse separation $1/2k_0$. In this work, we investigate pairwise
annihilation of Weyl nodes induced by external magnetic field which ranges all
the way from small to a very large value in the Hofstadter regime $l_B \sim a$.
We show that this pairwise annihilation in a WSM featuring two Weyl nodes leads
to the emergence of either a normal insulator or a layered Chern insulator. In
the case of a Weyl semimetal with multiple Weyl nodes, the potential for
generating a variety of states through external magnetic fields emerges. Our
study introduces a straightforward and intuitive representation of the pairwise
annihilation process induced by magnetic fields, enabling accurate predictions
of the phases that may appear after pairwise annihilation of Weyl nodes.
Adiabatic processes can keep the quantum system in its instantaneous
eigenstate, which is robust to noises and dissipation. However, it is limited
by sufficiently slow evolution. Here, we experimentally demonstrate the
transitionless quantum driving (TLQD) of the shortcuts to adiabaticity in
gate-defined semiconductor quantum dots (QDs) to greatly accelerate the
conventional adiabatic passage for the first time. For a given efficiency of
quantum state transfer, the acceleration can be more than twofold. The dynamic
properties also prove that the TLQD can guarantee fast and high-fidelity
quantum state transfer. In order to compensate for the diabatic errors caused
by dephasing noises, the modified TLQD is proposed and demonstrated in
experiment by enlarging the width of the counter-diabatic drivings. The
benchmarking shows that the state transfer fidelity of 97.8% can be achieved.
This work will greatly promote researches and applications about quantum
simulations and adiabatic quantum computation based on the gate-defined QDs.
We implement circuit quantum electrodynamics (cQED) with quantum dots in
bilayer graphene, a maturing material platform for semiconductor qubits that
can host long-lived spin and valley states. The presented device combines a
high-impedance ($Z_\mathrm{r} \approx 1 \mathrm{k{\Omega}}$) superconducting
microwave resonator with a double quantum dot electrostatically defined in a
graphene-based van der Waals heterostructure. Electric dipole coupling between
the subsystems allows the resonator to sense the electric susceptibility of the
double quantum dot from which we reconstruct its charge stability diagram. We
achieve sensitive and fast detection with a signal-to-noise ratio of 3.5 within
1 ${\mu}\mathrm{s}$ integration time. The charge-photon interaction is
quantified in the dispersive and resonant regimes by comparing the
coupling-induced change in the resonator response to input-output theory,
yielding a maximal coupling strength of $g/2{\pi} = 49.7 \mathrm{MHz}$. Our
results introduce cQED as a probe for quantum dots in van der Waals materials
and indicate a path toward coherent charge-photon coupling with bilayer
graphene quantum dots.
In computer and system sciences, higher-order cellular automata (HOCA) are a
type of cellular automata that evolve over multiple time steps and generate
complex patterns, which have various applications such as secret sharing
schemes, data compression, and image encryption. In this paper, we introduce
HOCA to quantum many-body physics and construct a series of symmetry-protected
topological (SPT) phases of matter, in which symmetries are supported on a
great variety of subsystems embbeded in the SPT bulk. We call these phases
HOCA-generated SPT (HGSPT) phases. Specifically, we show that HOCA can generate
not only well-understood SPTs with symmetries supported on either regular
(e.g., line-like subsystems in the 2D cluster model) or fractal subsystems, but
also a large class of unexplored SPTs with symmetries supported on more choices
of subsystems. One example is mixed-subsystem SPT that has either fractal and
line-like subsystem symmetries simultaneously or two distinct types of fractal
symmetries simultaneously. Another example is chaotic SPT in which
chaotic-looking symmetries are significantly different from and thus cannot
reduce to fractal or regular subsystem symmetries. We also introduce a new
notation system to characterize HGSPTs. As the usual two-point strange
correlators are trivial in most HGSPTs, we find that the nontrivial SPT orders
can be detected by what we call multi-point strange correlators. We propose a
universal procedure to design the spatial configuration of the multi-point
strange correlators for a given HGSPT phase. Our HOCA programs and multi-point
strange correlators pave the way for a unified paradigm to design, classify,
and detect phases of matter with symmetries supported on a great variety of
subsystems, and also provide potential useful perspective in surpassing the
computational irreducibility of HOCA in a quantum mechanical way.
Topology, like symmetry, is a fundamental concept in understanding general
properties of physical systems. In condensed matter systems, non-trivial
topology may manifest itself as singular features in the energy spectrum or the
quantization of observable quantities such as electrical conductance and
magnetic flux. Using microwave spectroscopy, we show that a superconducting
circuit with three Josephson tunnel junctions in parallel can possess energy
degeneracies indicative of $\textrm{\emph{intrinsic}}$ non-trivial topology. We
identify three topological invariants, one of which is related to a hidden
quantum mechanical supersymmetry. Depending on fabrication parameters, devices
are gapless or not, and fall on a simple phase diagram which is shown to be
robust to perturbations including junction imperfections, asymmetry, and
inductance. Josephson tunnel junction circuits, which are readily fabricated
with conventional microlithography techniques, allow access to a wide range of
topological systems which have no condensed matter analog. Notable spectral
features of these circuits, such as degeneracies and flat bands, may be
leveraged for quantum information applications, whereas quantized transport
properties could be useful for metrology applications.
The capability of magnons to hybridize and strongly couple with diverse
excitations offers a promising avenue for realizing and controlling emergent
properties that hold significant potential for applications in devices,
circuits, and information processing. In this letter, we present recent
theoretical and experimental developments in magnon-based hybrid systems,
focusing on the combination of magnon excitation in an antiferromagnet with
other excitations, namely plasmons in a topological insulator, phonons in a 2D
AFM, and photons. The existence of THz frequency magnons, plasmons, and phonons
makes magnon-based hybrid systems particularly appealing for
high-operating-speed devices. In this context, we explore several directions to
advance magnon hybrid systems, including strong coupling between a surface
plasmon and magnon polariton in a TI/AFM bilayer, a giant spin Nernst effect
induced by magnon phonon coupling in 2D AFMs, and control of magnon-photon
coupling using spin torque.
Employing large-scale quantum Monte Carlo simulations, we find in magnetized
interacting Dirac fermion model, there emerges a new and universal collective
Larmor-Silin spin wave mode in the transverse dynamical spin susceptibility.
Such mode purely originates from the interaction among Dirac fermions and
distinguishes itself from the usual particle-hole continuum with finite
lifetime and clear dispersion, both at small and large momenta in a large
portion of the Brillouin zone. Our unbiased numerical results offer the dynamic
signature of this new collective excitations in interacting Dirac fermion
systems, and provide experimental guidance for inelastic neutron scattering,
electron spin resonance and other spectroscopic approaches in the investigation
of such universal collective modes in quantum Moire materials, topological
insulators and quantum spin liquid materials under magnetic field, with
quintessential interaction nature beyond the commonly assumed noninteracting
Dirac fermion or spinon approximations.

Date of feed: Tue, 30 Jan 2024 01:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **A Collision Operator for Describing Dissipation in Noncanonical Phase Space. (arXiv:2401.15086v1 [cond-mat.stat-mech])**

Naoki Sato, Philip J. Morrison

**First-principles Methodology for studying magnetotransport in magnetic materials. (arXiv:2401.15146v1 [cond-mat.mtrl-sci])**

Zhihao Liu, Shengnan Zhang, Zhong Fang, Hongming Weng, Quansheng Wu

**New perspectives of Hall effects from first-principles calculations. (arXiv:2401.15150v1 [cond-mat.mtrl-sci])**

ShengNan Zhang, Hanqi Pi, Zhong Fang, Hongming Weng, QuanSheng Wu

**First-principles methodology for studying magnetotransport in narrow-gap semiconductors: an application to Zirconium Pentatelluride ZrTe5. (arXiv:2401.15151v1 [cond-mat.mtrl-sci])**

Hanqi Pi, Shengnan Zhang, Yang Xu, Zhong Fang, Hongming Weng, Quansheng Wu

**Polaron spectra and edge singularities for correlated flat bands. (arXiv:2401.15155v1 [cond-mat.str-el])**

Dimitri Pimenov

**Soft spots of net negative topological charge directly cause the plasticity of 3D glasses. (arXiv:2401.15359v1 [cond-mat.soft])**

Arabinda Bera, Matteo Baggioli, Timothy C. Petersen, Timothy W. Sirk, Amelia C. Y. Liu, Alessio Zaccone

**Multistable localized states in highly photonic polariton rings with a quasiperiodic modulation. (arXiv:2401.15396v1 [cond-mat.mes-hall])**

Andrei V. Nikitin, Dmitry A. Zezyulin

**Corrosion resistance of a water-borne resin doped with graphene derivatives applied on galvanized steel. (arXiv:2401.15410v1 [cond-mat.mtrl-sci])**

A. Collazo, B. Díaz, R. Figueroa, X.R. Nóvoa, C. Pérez

**Hometronics: Accessible production of graphene suspensions for health sensing applications using only household items. (arXiv:2401.15418v1 [cond-mat.mtrl-sci])**

Adel K.A. Aljarid, Jasper Winder, Cencen Wei, Arvind Venkatraman, Oliver Tomes, Aaron Soul, Dimitrios G. Papageorgiou, Matthias E. Möbius, Conor S. Boland

**All-electrical driving and probing of dressed states in a single spin. (arXiv:2401.15440v1 [cond-mat.mes-hall])**

Hong T. Bui, Christoph Wolf, Yu Wang, Masahiro Haze, Arzhang Ardavan, Andreas J. Heinrich, Soo-hyon Phark

**Electronic structure and physical properties of candidate topological material GdAgGe. (arXiv:2401.15464v1 [cond-mat.str-el])**

D. Ram, J. Singh, M. K. Hooda, O. Pavlosiuk, V. Kanchana, Z. Hossain, D. Kaczorowski

**Challenges and Opportunities in Searching for Rashba-Dresselhaus Materials for Efficient Spin-Charge Interconversion at Room Temperature. (arXiv:2401.15524v1 [cond-mat.mtrl-sci])**

Zixu Wang, Zhizhong Chen, Rui Xu, Hanyu Zhu, Ravishankar Sundararaman, Jian Shi

**Dirac mass induced by optical gain and loss. (arXiv:2401.15528v1 [cond-mat.mes-hall])**

Letian Yu, Haoran Xue, Ruixiang Guo, Eng Aik Chan, Yun Yong Terh, Cesare Soci, Baile Zhang, Y. D. Chong

**Magnetic interactions and excitations in SrMnSb$_2$. (arXiv:2401.15572v1 [cond-mat.mtrl-sci])**

Zhenhua Ning, Bing Li, Arnab Banerjee, Victor Fanelli, Doug Abernathy, Yong Liu, Benjamin G Ueland, Robert J. McQueeney, Liqin Ke

**Predicting Novel Properties in Two-Dimensional Janus Transition Metal Hydrosulfides with 2H and 1T Phases: Electrodes, Charge Density Waves, and Superconductivity. (arXiv:2401.15577v1 [cond-mat.mtrl-sci])**

Dawei Zhoua, Zhuo Wangb, Pan Zhanga, Chunying Pua

**In-plane Antiferromagnetism in Ferromagnetic Kagome Semimetal Co3Sn2S2. (arXiv:2401.15602v1 [cond-mat.mtrl-sci])**

Sandy Adhitia Ekahana, Satoshi Okamoto, Jan Dreiser, Loïc Roduit, Gawryluk Dariusz Jakub, Andrew Hunter, Anna Tamai, Y. Soh

**Aperiodic-quasiperiodic-periodic characteristics in twisted nested Moir\'e patterns and topological transitions. (arXiv:2401.15849v1 [cond-mat.mes-hall])**

Peng Peng, Yuchen Peng, Aoqian Shi, Xiaogen Yi, Yizhou Wei, Jianjun Liu

**Topological magnon-polarons in honeycomb antiferromagnets with spin-flop transition. (arXiv:2401.15888v1 [cond-mat.mes-hall])**

Gyungchoon Go, Heejun Yang, Je-Geun Park, Se Kwon Kim

**Fast renormalizing the structures and dynamics of ultra-large systems via random renormalization group. (arXiv:2401.15899v1 [cond-mat.stat-mech])**

Yang Tian, Yizhou Xu, Pei Sun

**Energy Localization and Topological Defect in Spherical Non-Hermitian Topolectrical Circuits. (arXiv:2401.15908v1 [physics.app-ph])**

Xizhou Shen, Xiumei Wang, Haotian Guo, Xingping Zhou

**Tunable vortex bound states in multiband CsV3Sb5-derived kagome superconductors. (arXiv:2401.15918v1 [cond-mat.supr-con])**

Zihao Huang, Xianghe Han, Zhen Zhao, Jinjin Liu, Pengfei Li, Hengxin Tan, Zhiwei Wang, Yugui Yao, Haitao Yang, Binghai Yan, Kun Jiang, Jiangping Hu, Ziqiang Wang, Hui Chen, Hong-Jun Gao

**AdvNF: Reducing Mode Collapse in Conditional Normalising Flows using Adversarial Learning. (arXiv:2401.15948v1 [cs.LG])**

Vikas Kanaujia, Mathias S. Scheurer, Vipul Arora

**Measurement of the Chern Number for Non-Hermitian Chern Insulators. (arXiv:2401.15991v1 [cond-mat.mes-hall])**

Hongfang Liu, Ming Lu, Shengdu Chai, Zhi-Qiang Zhang, Hua Jiang

**Resonant helical multi-edge transport in Sierpi\'nski carpets. (arXiv:2401.16014v1 [cond-mat.mtrl-sci])**

M. A. Toloza Sandoval, A. L. Araújo, F. Crasto de Lima, A. Fazzio

**Temperature-dependent local structure and lattice dynamics of 1T-TiSe$_2$ and 1T-VSe$_2$ probed by X-ray absorption spectroscopy. (arXiv:2401.16118v1 [cond-mat.mtrl-sci])**

Inga Pudza, Boris Polyakov, Kaspars Pudzs, Edmund Welter, Alexei Kuzmin

**Sliding ferroelectric memories and synapses. (arXiv:2401.16150v1 [cond-mat.mes-hall])**

Xiuzhen Li, Biao Qin, Yaxian Wang, Yue Xi, Zhiheng Huang, Mengze Zhao, Yalin Peng, Zitao Chen, Zitian Pan, Jundong Zhu, Chenyang Cui, Rong Yang, Wei Yang, Sheng Meng, Dongxia Shi, Xuedong Bai, Can Liu, Na Li, Jianshi Tang, Kaihui Liu, Luojun Du, Guangyu Zhang

**Macroscopic electro-optical modulation of solution-processed molybdenum disulfide. (arXiv:2401.16194v1 [cond-mat.mtrl-sci])**

Songwei Liu, Yingyi Wen, Jingfang Pei, Xiaoyue Fan, Yongheng Zhou, Yang Liu, Ling-Kiu Ng, Yue Lin, Teng Ma, Panpan Zhang, Xiaolong Chen, Gang Wang, Guohua Hu

**Competing magnetic states on the surface of multilayer ABC-stacked graphene. (arXiv:2401.16345v1 [cond-mat.mes-hall])**

Lauro B. Braz, Tanay Nag, Annica M. Black-Schaffer

**Three-band extension for the Glashow-Weinberg-Salam model. (arXiv:2401.16346v1 [cond-mat.supr-con])**

Konstantin V. Grigorishin

**Theory of intrinsic acoustic plasmons in twisted bilayer graphene. (arXiv:2401.16384v1 [cond-mat.mes-hall])**

Lorenzo Cavicchi, Iacopo Torre, Pablo Jarillo-Herrero, Frank H. L. Koppens, Marco Polini

**Quantized Hall conductance in 3D topological nodal-line semimetals without chiral symmetry. (arXiv:2004.01386v2 [cond-mat.mes-hall] UPDATED)**

Guang-Qi Zhao, W. B. Rui, C. M. Wang, Hai-Zhou Lu, X. C. Xie

**Topological Spectral Bands with Frieze Groups. (arXiv:2209.12306v2 [cond-mat.mtrl-sci] UPDATED)**

Fabian R. Lux, Tom Stoiber, Shaoyun Wang, Guoliang Huang, Emil Prodan

**Non-Invertible Duality Transformation Between SPT and SSB Phases. (arXiv:2301.07899v3 [cond-mat.str-el] UPDATED)**

Linhao Li, Masaki Oshikawa, Yunqin Zheng

**The bosonic skin effect: boundary condensation in asymmetric transport. (arXiv:2301.11339v2 [quant-ph] UPDATED)**

Louis Garbe, Yuri Minoguchi, Julian Huber, Peter Rabl

**Hinge Majorana Flat Band in Type-II Dirac Semimetals. (arXiv:2303.11729v3 [cond-mat.supr-con] UPDATED)**

Yue Xie, Xianxin Wu, Zhong Fang, Zhijun Wang

**Visualization of alternating triangular domains of charge density waves in 2H-NbSe$_2$ by scanning tunneling microscopy. (arXiv:2304.00846v2 [cond-mat.str-el] UPDATED)**

Shunsuke Yoshizawa, Keisuke Sagisaka, Hideaki Sakata

**Fracton-elasticity duality on curved manifolds. (arXiv:2304.12242v2 [hep-th] UPDATED)**

Lazaros Tsaloukidis, José J. Fernández-Melgarejo, Javier Molina-Vilaplana, Piotr Surówka

**2D triangular Ising model with bond phonons: An entropic simulation study. (arXiv:2305.03127v2 [cond-mat.stat-mech] UPDATED)**

R. M. L. Nascimento, Claudio J. DaSilva, L. S. Ferreira, A. A. Caparica

**A new microscopic representation of the spin dynamics in quantum systems with the Coulomb exchange interactions. (arXiv:2305.03826v3 [cond-mat.mtrl-sci] UPDATED)**

Mariya Iv. Trukhanova, Pavel Andreev

**Magnetostriction-Driven Muon Localization in an Antiferromagnetic Oxide. (arXiv:2305.12237v3 [cond-mat.str-el] UPDATED)**

Pietro Bonfà, Ifeanyi John Onuorah, Franz Lang, Iurii Timrov, Lorenzo Monacelli, Chennan Wang, Xiao Sun, Oleg Petracic, Giovanni Pizzi, Nicola Marzari, Stephen J. Blundell, Roberto De Renzi

**Quantum impurity with 2/3 local moment in 1D quantum wires: an NRG study. (arXiv:2305.18121v2 [cond-mat.str-el] UPDATED)**

P. A. Almeida, M. A. Manya, M. S. Figueira, S. E. Ulloa, E. V. Anda, G. B. Martins

**Non-coplanar helimagnetism in the layered van-der-Waals metal DyTe$_3$. (arXiv:2306.04854v2 [cond-mat.mtrl-sci] UPDATED)**

Shun Akatsuka, Sebastian Esser, Shun Okumura, Ryota Yambe, Rinsuke Yamada, Moritz M. Hirschmann, Seno Aji, Jonathan S. White, Shang Gao, Yoshichika Onuki, Taka-hisa Arima, Taro Nakajima, Max Hirschberger

**The $\mathrm{SO}(5)$ Deconfined Phase Transition under the Fuzzy Sphere Microscope: Approximate Conformal Symmetry, Pseudo-Criticality, and Operator Spectrum. (arXiv:2306.16435v3 [cond-mat.str-el] UPDATED)**

Zheng Zhou, Liangdong Hu, W. Zhu, Yin-Chen He

**Signature of nodal topology in nonlinear quantum transport across junctions in Weyl and multi-Weyl semimetals. (arXiv:2307.11737v3 [cond-mat.mes-hall] UPDATED)**

Suvendu Ghosh, Snehasish Nandy, Jian-Xin Zhu, A. Taraphder

**Electronic Structure and Vibrational Stability of Copper-substituted Lead Apatite (LK-99). (arXiv:2308.01135v3 [cond-mat.supr-con] UPDATED)**

J. Cabezas-Escares, N. F. Barrera, R. H. Lavroff, A. N. Alexandrova, C. Cardenas, F. Munoz

**Optimization Algorithms for Multi-Species Spherical Spin Glasses. (arXiv:2308.09672v3 [math.PR] UPDATED)**

Brice Huang, Mark Sellke

**Second-order topological superconductor via noncollinear magnetic texture. (arXiv:2308.12703v2 [cond-mat.mes-hall] UPDATED)**

Pritam Chatterjee, Arnob Kumar Ghosh, Ashis K. Nandy, Arijit Saha

**Energetics of twisted elastic filament pairs. (arXiv:2309.11344v2 [cond-mat.soft] UPDATED)**

Julien Chopin, Animesh Biswas, Arshad Kudrolli

**Matter-wave collimation to picokelvin energies with scattering length and potential shape control. (arXiv:2310.04383v2 [physics.atom-ph] UPDATED)**

Alexander Herbst, Timothé Estrampes, Henning Albers, Robin Corgier, Knut Stolzenberg, Sebastian Bode, Eric Charron, Ernst M. Rasel, Naceur Gaaloul, Dennis Schlippert

**Active Solids Model: Rigid Body Motion and Shape-changing Mechanisms. (arXiv:2310.12879v2 [cond-mat.soft] UPDATED)**

Claudio Hernández-López (1 and 4), Paul Baconnier (2), Corentin Coulais (3), Olivier Dauchot (2), Gustavo Düring (4) ((1) École Normale Supérieure Paris, (2) Gulliver ESPCI Paris, (3) Institute of Physics Universiteit van Amsterdam, (4) Instituto de Física Pontificia Universidad Católica de Chile)

**Trions in two-dimensional monolayers within the hyperspherical harmonics method. Application to transition metal dichalcogenides. (arXiv:2310.19196v2 [cond-mat.mes-hall] UPDATED)**

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

**Temperature upper bound of an ideal gas. (arXiv:2311.06994v3 [cond-mat.stat-mech] UPDATED)**

Hyeong-Chan Kim

**Solid-that-flows picture of glass-forming liquids. (arXiv:2311.14460v4 [cond-mat.soft] UPDATED)**

Jeppe C. Dyre

**Pairwise annihilation of Weyl nodes induced by magnetic fields in the Hofstadter regime. (arXiv:2312.02463v2 [cond-mat.mes-hall] UPDATED)**

Faruk Abdulla

**Accelerated adiabatic passage of a single electron spin qubit in quantum dots. (arXiv:2312.13135v2 [cond-mat.mes-hall] UPDATED)**

Xiao-Fei Liu, Yuta Matsumoto, Takafumi Fujita, Arne Ludwig, Andreas D. Wieck, Akira Oiwa

**Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator. (arXiv:2312.14629v2 [cond-mat.mes-hall] UPDATED)**

Max J. Ruckriegel, Lisa M. Gächter, David Kealhofer, Mohsen Bahrami Panah, Chuyao Tong, Christoph Adam, Michele Masseroni, Hadrien Duprez, Rebekka Garreis, Kenji Watanabe, Takashi Taniguchi, Andreas Wallraff, Thomas Ihn, Klaus Ensslin, Wei Wister Huang

**Higher-Order Cellular Automata Generated Symmetry-Protected Topological Phases and Detection Through Multi-Point Strange Correlators. (arXiv:2401.00505v2 [cond-mat.str-el] UPDATED)**

Jie-Yu Zhang, Meng-Yuan Li, Peng Ye

**Spectral signatures of non-trivial topology in a superconducting circuit. (arXiv:2401.10876v2 [cond-mat.mes-hall] UPDATED)**

L. Peyruchat (1 and 2), R. H. Rodriguez (1 and 2), J.-L. Smirr (2), R. Leone (3), Ç. Ö. Girit (1 and 2) ((1) Quantronics Group, Université Paris Saclay, CEA, CNRS, SPEC, (2) JEIP, USR 3573 CNRS, Collège de France, PSL University, (3) Laboratoire de Physique et Chimie Théoriques, Université de Lorraine, CNRS)

**Hybridized magnonic materials for THz frequency applications. (arXiv:2401.11010v2 [cond-mat.mtrl-sci] UPDATED)**

D.-Q. To, A. Rai, J. M. O. Zide, S. Law, J. Q. Xiao, M. B. Jungfleisch, M. F. Doty

**Universal collective Larmor-Silin mode emerging in magnetized correlated Dirac fermions. (arXiv:2401.14358v2 [cond-mat.str-el] UPDATED)**

Chuang Chen, Yuan Da Liao, Chengkang Zhou, Gaopei Pan, Zi Yang Meng, Yang Qi

Found 12 papers in prb With increasing performance of actual qubit devices, even subtle effects in the interaction between qubits and environmental degrees of freedom become progressively relevant and experimentally visible. This applies particularly to the timescale separations that are at the basis of the most commonly … Using first-principles calculations we investigate the intrinsic origins of the anomalous Hall effect (AHE) and the anomalous Nernst effect (ANE) in antiperovskite ferrimagnet ${\mathrm{Mn}}_{4}\mathrm{N}$. We predict that the AHE is significantly enhanced under both compressive and tensile strain; … ${\mathrm{Eu}}_{5}{\mathrm{In}}_{2}{\mathrm{Sb}}_{6}$ is an orthorhombic nonsymmorphic small band gap semiconductor with three distinct ${\mathrm{Eu}}^{2+}$ sites and two low-temperature magnetic phase transitions. The material displays one of the greatest (negative) magnetoresistances of known stoi… ${\mathrm{TbMn}}_{6}{\mathrm{Sn}}_{6}$ is a correlated topological magnet with a Mn-based kagome lattice, in which a Chern gap opens at the Dirac point at low temperatures. The magnetic moment direction of the ferrimagnetic order changes from in the kagome plane to out-of-plane upon cooling, which i… Corner-localized states represent intriguing aspects of higher-order topological systems. Despite their importance, the topological invariant that distinguishes between zero-energy and non-zero-energy corner states has received limited attention in the literature. Therefore, we introduce “modified m… The effects of 2.5-MeV electron irradiation were studied in the superconducting phase of single crystals of ${\mathrm{LaNiGa}}_{2}$, using measurements of electrical transport and radio-frequency magnetic susceptibility. The London penetration depth is found to vary exponentially with temperature, s… When an electron beam hits an interface at a point, the reflection beam comes back from another interface point and a reflection shift occurs in real space. We investigate the reflection shift evolution and Fermi arcs on the interface between two Multifold Weyl semimetals by changing the system para… Understanding the interaction mechanics between graphene layers and coaxial carbon nanotubes (CNTs) is essential for modeling graphene and CNT-based nanoelectromechanical systems. This work proposes a new continuum contact model to study interlayer interactions between curved graphene sheets. The co… Fractionally filled Chern bands with strong interactions may give rise to fractional Chern insulator (FCI) states, the zero-field analog of the fractional quantum Hall effect. Recent experiments have demonstrated the existence of FCIs in twisted bilayer ${\mathrm{MoTe}}_{2}$ without external magneti… The fascination with semimetals, especially Dirac and Weyl semimetals, is given by their surprisingly strong response to magnetic fields. In particular, the extremely large magnetoresistance (XMR), i.e., the change in electrical resistivity as a function of the applied magnetic field, has attracted … Although the topological properties of type-II Weyl semimetal ${\mathrm{WP}}_{2}$ have been widely studied by both the experiments and the theoretical calculations, the dominant electron-phonon scattering and the effect of Fermi pockets on the electronic transport still remain elusive. In this work,… We propose how to create, control, and read out real-space localized spin qubits in proximitized finite graphene nanoribbon (GNR) systems using purely electrical methods. Our proposed

Date of feed: Tue, 30 Jan 2024 04:17:04 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) **Qubit dynamics beyond Lindblad: Non-Markovianity versus rotating wave approximation**

Kiyoto Nakamura and Joachim Ankerhold

Author(s): Kiyoto Nakamura and Joachim Ankerhold

[Phys. Rev. B 109, 014315] Published Mon Jan 29, 2024

**Intrinsic origin and enhancement of topological responses in ferrimagnetic antiperovskite ${\mathrm{Mn}}_{4}\mathrm{N}$**

Temuujin Bayaraa, Vsevolod Ivanov, Liang Z. Tan, and Sinéad M. Griffin

Author(s): Temuujin Bayaraa, Vsevolod Ivanov, Liang Z. Tan, and Sinéad M. Griffin

[Phys. Rev. B 109, 014430] Published Mon Jan 29, 2024

**Noncollinear $2\mathrm{k}$ antiferromagnetism in the Zintl semiconductor ${\mathrm{Eu}}_{5}{\mathrm{In}}_{2}{\mathrm{Sb}}_{6}$**

Vincent C. Morano, Jonathan Gaudet, Nicodemos Varnava, Tanya Berry, Thomas Halloran, Chris J. Lygouras, Xiaoping Wang, Christina M. Hoffman, Guangyong Xu, Jeffrey W. Lynn, Tyrel M. McQueen, David Vanderbilt, and Collin L. Broholm

Author(s): Vincent C. Morano, Jonathan Gaudet, Nicodemos Varnava, Tanya Berry, Thomas Halloran, Chris J. Lygouras, Xiaoping Wang, Christina M. Hoffman, Guangyong Xu, Jeffrey W. Lynn, Tyrel M. McQueen, David Vanderbilt, and Collin L. Broholm

[Phys. Rev. B 109, 014432] Published Mon Jan 29, 2024

**Microscopic origin of the spin-reorientation transition in the kagome topological magnet ${\mathrm{TbMn}}_{6}{\mathrm{Sn}}_{6}$**

Zhentao Huang, Wei Wang, Huiqing Ye, Song Bao, Yanyan Shangguan, Junbo Liao, Saizheng Cao, Ryoichi Kajimoto, Kazuhiko Ikeuchi, Guochu Deng, Michael Smidman, Yu Song, Shun-Li Yu, Jian-Xin Li, and Jinsheng Wen

Author(s): Zhentao Huang, Wei Wang, Huiqing Ye, Song Bao, Yanyan Shangguan, Junbo Liao, Saizheng Cao, Ryoichi Kajimoto, Kazuhiko Ikeuchi, Guochu Deng, Michael Smidman, Yu Song, Shun-Li Yu, Jian-Xin Li, and Jinsheng Wen

[Phys. Rev. B 109, 014434] Published Mon Jan 29, 2024

**Characterization of zero-energy corner states in higher-order topological systems with chiral symmetry**

Wen-Jie Yang, Shi-Feng Li, Xin-Ye Zou, and Jian-Chun Cheng

Author(s): Wen-Jie Yang, Shi-Feng Li, Xin-Ye Zou, and Jian-Chun Cheng

[Phys. Rev. B 109, 024114] Published Mon Jan 29, 2024

**Electron irradiation reveals robust fully gapped superconductivity in ${\mathrm{LaNiGa}}_{2}$**

S. Ghimire, K. R. Joshi, E. H. Krenkel, M. A. Tanatar, Yunshu Shi, M. Kończykowski, R. Grasset, V. Taufour, P. P. Orth, M. S. Scheurer, and R. Prozorov

Author(s): S. Ghimire, K. R. Joshi, E. H. Krenkel, M. A. Tanatar, Yunshu Shi, M. Kończykowski, R. Grasset, V. Taufour, P. P. Orth, M. S. Scheurer, and R. Prozorov

[Phys. Rev. B 109, 024515] Published Mon Jan 29, 2024

**Creation and annihilation of reflection shift vortices on the interface between multifold Weyl semimetals**

Qiao He, Rui-Qiang Wang, Ming-Xun Deng, and Mou Yang

Author(s): Qiao He, Rui-Qiang Wang, Ming-Xun Deng, and Mou Yang

[Phys. Rev. B 109, 035434] Published Mon Jan 29, 2024

**Continuum contact model for friction between graphene sheets that accounts for surface anisotropy and curvature**

Aningi Mokhalingam, Shakti S. Gupta, and Roger A. Sauer

Author(s): Aningi Mokhalingam, Shakti S. Gupta, and Roger A. Sauer

[Phys. Rev. B 109, 035435] Published Mon Jan 29, 2024

**Fractional Chern insulators versus nonmagnetic states in twisted bilayer ${\mathrm{MoTe}}_{2}$**

Jiabin Yu, Jonah Herzog-Arbeitman, Minxuan Wang, Oskar Vafek, B. Andrei Bernevig, and Nicolas Regnault

Author(s): Jiabin Yu, Jonah Herzog-Arbeitman, Minxuan Wang, Oskar Vafek, B. Andrei Bernevig, and Nicolas Regnault

[Phys. Rev. B 109, 045147] Published Mon Jan 29, 2024

**Origin of the extreme and anisotropic magnetoresistance in the Weyl semimetal NbP**

F. Balduini, A. Molinari, L. Rocchino, V. Hasse, C. Felser, C. Zota, H. Schmid, and B. Gotsmann

Author(s): F. Balduini, A. Molinari, L. Rocchino, V. Hasse, C. Felser, C. Zota, H. Schmid, and B. Gotsmann

[Phys. Rev. B 109, 045148] Published Mon Jan 29, 2024

**Effect of electron-phonon scattering on the electronic transport of Weyl semimetal ${\mathrm{WP}}_{2}$**

Kai-Cheng Zhang, Chen Shen, Hong-Bin Zhang, Yong-Feng Li, and Yong Liu

Author(s): Kai-Cheng Zhang, Chen Shen, Hong-Bin Zhang, Yong-Feng Li, and Yong Liu

[Phys. Rev. B 109, 045149] Published Mon Jan 29, 2024

**Ultrafast all-electrical universal nanoqubits**

David T. S. Perkins and Aires Ferreira

Author(s): David T. S. Perkins and Aires Ferreira*nanoqubits* are formed of in-gap singlet-triplet states that emerge through the interplay of Coulomb and relativistic…

[Phys. Rev. B 109, L041411] Published Mon Jan 29, 2024

Found 2 papers in prl The charge density wave (CDW) state of $2H\text{−}{\mathrm{NbSe}}_{2}$ features commensurate domains separated by domain boundaries accompanied by phase slips known as discommensurations. We have unambiguously visualized the structure of CDW domains using a displacement-field measurement algorithm o… Laser-induced shift of atomic states due to the ac Stark effect has played a central role in cold-atom physics and facilitated their emergence as analog quantum simulators. Here, we explore this phenomenon in an atomically thin layer of semiconductor ${\mathrm{MoSe}}_{2}$, which we embedded in a het…

Date of feed: Tue, 30 Jan 2024 04:17:01 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) **Visualization of Alternating Triangular Domains of Charge Density Waves in $2H\text{−}{\mathrm{NbSe}}_{2}$ by Scanning Tunneling Microscopy**

Shunsuke Yoshizawa, Keisuke Sagisaka, and Hideaki Sakata

Author(s): Shunsuke Yoshizawa, Keisuke Sagisaka, and Hideaki Sakata

[Phys. Rev. Lett. 132, 056401] Published Mon Jan 29, 2024

**Interaction-Induced ac Stark Shift of Exciton-Polaron Resonances**

T. Uto, B. Evrard, K. Watanabe, T. Taniguchi, M. Kroner, and A. İmamoğlu

Author(s): T. Uto, B. Evrard, K. Watanabe, T. Taniguchi, M. Kroner, and A. İmamoğlu

[Phys. Rev. Lett. 132, 056901] Published Mon Jan 29, 2024

Found 2 papers in acs-nano

Date of feed: Mon, 29 Jan 2024 14:03:52 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] Graphene Magnetoresistance Control by Photoferroelectric Substrate**

Krishna Maity, Jean-François Dayen, Bernard Doudin, Roman Gumeniuk, and Bohdan KundysACS NanoDOI: 10.1021/acsnano.3c07277

**[ASAP] Ultrahigh Photosensitivity Based on Single-Step Lay-on Integration of Freestanding Two-Dimensional Transition-Metal Dichalcogenide**

Hyun Jeong, Komla Nomenyo, Hye Min Oh, Agnieszka Gwiazda, Seok Joon Yun, Clotaire Chevalier César, Rafael Salas-Montiel, Sibiri Wourè-Nadiri Bayor, Mun Seok Jeong, Young Hee Lee, and Gilles LérondelACS NanoDOI: 10.1021/acsnano.3c10721

Found 1 papers in nat-comm **Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Supercurrent mediated by helical edge modes in bilayer graphene**

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