Found 30 papers in cond-mat Lieb-Schultz-Mattis (LSM) theorems impose non-perturbative constraints on the
zero-temperature phase diagrams of quantum lattice Hamiltonians (always assumed
to be local in this paper). LSM theorems have recently been interpreted as the
lattice counterparts to mixed 't Hooft anomalies in quantum field theories that
arise from a combination of crystalline and global internal symmetry groups.
Accordingly, LSM theorems have been reinterpreted as LSM anomalies. In this
work, we provide a systematic diagnostic for LSM anomalies in one spatial
dimension. We show that gauging subgroups of the global internal symmetry group
of a quantum lattice model obeying an LSM anomaly delivers a dual quantum
lattice Hamiltonian such that its internal and crystalline symmetries mix
non-trivially through a group extension. This mixing of crystalline and
internal symmetries after gauging is a direct consequence of the LSM anomaly,
i.e., it can be used as a diagnostic of an LSM anomaly. We exemplify this
procedure for a quantum spin-1/2 chain obeying an LSM anomaly resulting from
combining a global internal $\mathbb{Z}^{\,}_{2}\times\mathbb{Z}^{\,}_{2}$
symmetry with translation or reflection symmetry. We establish a triality of
models by gauging a
$\mathbb{Z}^{\,}_{2}\subset\mathbb{Z}^{\,}_{2}\times\mathbb{Z}^{\,}_{2}$
symmetry in two ways, one of which amounts to performing a Kramers-Wannier
duality, while the other implements a Jordan-Wigner duality. We discuss the
mapping of the phase diagram of the quantum spin-1/2 $XYZ$ chains under such a
triality. We show that the deconfined quantum critical transitions between Neel
and dimer orders are mapped to either topological or conventional
Landau-Ginzburg transitions.
Magic-angle twisted bilayer graphene (TBG) exhibits a captivating phase
diagram as a function of doping, featuring superconductivity and a variety of
insulating and magnetic states. The bands host Dirac fermions with a reduced
Fermi velocity; experiments have shown that the Dirac dispersion reappears near
integer fillings of the moir\'e unit cell -- referred to as the $\textit{Dirac
revival}$ phenomenon. The reduced velocity of these Dirac states leads us to
propose a scenario in which the Dirac fermions possess an approximately
quadratic dispersion. The quadratic momentum dependence and particle-hole
degeneracy at the Dirac point results in a logarithmic enhancement of
interaction effects, which does not appear for a linear dispersion. The
resulting non-trivial renormalisation group (RG) flow naturally produces the
qualitative phase diagram as a function of doping -- with nematic and
insulating states near integer fillings, which give way to superconducting
states past a critical relative doping. The RG method further produces
different results to strong-coupling Hartree-Fock treatments: producing T-IVC
insulating states for repulsive interactions, explaining the results of very
recent STM experiments, alongside nodal $A_2$ superconductivity near
half-filling, whose properties explain puzzles in tunnelling studies of the
superconducting state. The model explains a diverse range of additional
experimental observations, unifying many aspects of the phase diagram of TBG.
Highly entangled excitations such as Majorana fermions of Kitaev quantum spin
liquids have been proposed to be utilized for future quantum science and
technology, and a deeper understanding of such excitations has been strongly
desired. Here we demonstrate that Majorana fermion's mass and associated
topological quantum phase transitions in the Kitaev quantum spin liquids may be
manipulated by using electric fields in sharp contrast to the common belief
that an insulator is inert under weak electric fields due to charge energy
gaps. Using general symmetry analysis with perturbation and exact
diagonalization, we uncover the universal phase diagrams with electric and
magnetic fields. We also provide distinctive experimental signatures to
identify Kitaev quantum spin liquids with electric fields, especially in
connection with the candidate materials such as $\alpha$-RuCl3.
The non-Hermitian skin effect is a phenomenon in which an extensive number of
states accumulates at the boundaries of a system. It has been associated to
nontrivial topology, with nonzero bulk invariants predicting its appearance and
its position in real space. Here we demonstrate that the non-Hermitian skin
effect is not a topological phenomenon in general: when translation symmetry is
broken by a single non-Hermitian impurity, skin modes are depleted at the
boundary and accumulate at the impurity site, without changing any bulk
invariant. This may occur even for a fully Hermitian bulk.
We introduce density imbalanced electron-hole bilayers at a commensurate 2 :
1 density ratio as a platform for realizing novel phases involving electrons,
excitons and trions. Three length scales are identified which characterize the
interplay between kinetic energy, intralayer repulsion, and interlayer
attraction. By a combination of theoretical analysis and numerical calculation,
we find a variety of strong-coupling phases in different parameter regions,
including quantum crystals of electrons, excitons, and trions. We also propose
an "excitonic supersolid" phase that features electron crystallization and
exciton superfluidity simultaneously. The material realization and experimental
signature of these phases are discussed in the context of semiconductor
transition metal dichalcogenide bilayers.
Bernal bilayer graphene has recently been discovered to exhibit a wide range
of unique ordered phases resulting from interaction-driven effects and
encompassing spin and valley magnetism, correlated insulators, correlated
metals, and superconductivity. This letter reports on a novel family of
correlated phases characterized by spin and valley ordering, observed in
electron-doped bilayer graphene. The novel correlated phases demonstrate an
intriguing non-linear current-bias behavior at ultralow currents that is
sensitive to the onset of the phases and is accompanied by an insulating
temperature dependence, providing strong evidence for the presence of
unconventional charge carrying degrees of freedom originating from ordering.
These characteristics cannot be solely attributed to any of the previously
reported phases, and are qualitatively different from the behavior seen
previously on the hole-doped side. Instead, our observations align with the
presence of charge- or spin-density-waves state that open a gap on a portion of
the Fermi surface or fully gapped Wigner crystals. The resulting new phases,
quasi-insulators in which part of the Fermi surface remains intact or
valley-polarized and valley-unpolarized Wigner crystals, coexist with
previously known Stoner phases, resulting in an exceptionally intricate phase
diagram.
Superconductor/topological material heterostructures are intensively studied
as a platform for topological superconductivity and Majorana physics. However,
the high cost of nanofabrication and the difficulty of preparing high-quality
interfaces between the two dissimilar materials are common obstacles that
hinder the observation of intrinsic physics and the realisation of scalable
topological devices and circuits. Here, we demonstrate an innovative method to
directly draw nanoscale superconducting beta-tin (beta-Sn) patterns of any
shape in the plane of a topological Dirac semimetal (TDS) alpha-tin (alpha-Sn)
thin film by irradiating a focused ion beam (FIB). We utilise the property that
alpha-Sn undergoes a phase transition to superconducting beta-Sn upon heating
by FIB. In beta-Sn nanowires embedded in a TDS alpha-Sn thin film, we observe
giant non-reciprocal superconducting transport, where the critical current
changes by 69% upon reversing the current direction. The superconducting diode
rectification ratio reaches a maximum when the magnetic field is applied
parallel to the current, distinguishing itself from all the previous reports.
Moreover, it oscillates between alternate signs with increasing magnetic field
strength. The angular dependence of the rectification ratio on the magnetic
field and current directions is similar to that of the chiral anomaly effect in
TDS alpha-Sn, suggesting that the non-reciprocal superconducting transport may
occur at the beta-Sn/alpha-Sn interfaces. The ion-beam patterned Sn-based
superconductor/TDS planar structures thus show promise as a universal platform
for investigating novel quantum physics and devices based on topological
superconducting circuits of any shape.
Topological insulators provide great potentials to control diffusion
phenomena as well as waves. Here, we show that the direction of thermal
diffusion can be selected by the contributions of the topologically protected
edge modes via the quantum spin Hall effect in a honeycomb-shaped structure. We
demonstrate that when we set our structure to the temperature corresponding to
the type of edge mode, the direction of thermal diffusion can be tuned.
Moreover, this diffusion system is found to be immune to defects owing to the
robustness of topological states. Our work points to exciting new avenues for
controlling diffusion phenomena.
The unambiguous detection of the Majorana zero mode (MZM), which is essential
for future topological quantum computing, has been a challenge in recent
condensed matter experiments. The MZM is expected to emerge at the vortex core
of topological superconductors as a zero-energy vortex bound state (ZVBS),
amenable to detection using scanning tunneling microscopy/spectroscopy
(STM/STS). However, the typical energy resolution of STM/STS has made it
challenging to distinguish the MZM from the low-lying trivial vortex bound
states. Here, we review the recent high-energy-resolution STM/STS experiments
on the vortex cores of Fe(Se,Te), where the MZM is expected to emerge, and the
energy of the lowest trivial bound states is reasonably high. Tunneling spectra
taken at the vortex cores exhibit a ZVBS well below any possible trivial state,
suggesting its MZM origin. However, it should be noted that ZVBS is a necessary
but not sufficient condition for the MZM; a qualitative feature unique to the
MZM needs to be explored. We discuss the current status and issues in the
pursuit of such Majorananess, namely the level sequence of the vortex bound
states and the conductance plateau of the ZVBS. We also argue for future
experiments to confirm the Majorananess, such as the detection of the doubling
of the shot noise intensity and spin polarization of the MZM.
Graphene flow sensors hold great prospects for applications, but also
encounter many difficulties, such as unwanted electrochemical phenomena, low
measurable signal and limited dependence on the flow direction. This study
proposes a novel approach allowing for the detection of a flow
direction-dependent electric signal in aqueous solutions of salts, acids and
bases. The key element in the proposed solution is the use of a reference
electrode which allows external gating of the graphene structure. Using
external gating enables to enhance substantially the amplitude of the
flow-generated signal. Simultaneous measurement of the reference electrode
current allows us to recover a flow-direction-sensitive component of the
flow-induced voltage in graphene. The obtained results are discussed in terms
of the Coulomb interaction and other phenomena which can be present at the
interface of graphene with the aqueous solution.
Two dimensional topological superconductors with chiral edge modes are
predicted to posses a quantized thermal Hall effect, exactly half that for
chiral topological insulators, which is proportional to the Chern number.
However not much work has been done in identifying this in the standard models
in the literature. Here we introduce a model based on a proximity induced
superconducting Bismuth bilayer, to directly calculate the thermal Hall
conductance based on the lattice model. This model serves as a demonstration of
the state of the art possible in such a calculation, as well as introducing an
interesting paradigmatic topological superconductor with a rich phase diagram.
We demonstrate the quantized thermal Hall plateaus in several different
topological phases, and compare this to numerical calculations of the Chern
number, as well as analytical calculations of the Chern number's parity
invariant. We demonstrate that it is possible to get a reasonable topological
phase diagram from the quantized thermal Hall calculations.
We study the effects of magnetization on the properties of the doped
topological insulator with nematic superconductivity. We found that the
direction of the in-plane magnetization fixes the direction of the nematicity
in the system. The chiral state is more favorable than the nematic state for
large values of out-of-plane magnetization. Overall, the critical temperature
of the nematic state is resilient against magnetization. We explore the
spectrum of the system with the pinned direction of the nematic order parameter
$\Delta_{y}$ in details. Without magnetization, there is a full gap in the
spectrum. At strong enough out-of-plane $m_z$ or orthogonal in-plane $m_x$
magnetization, the spectrum is closed at the nodal points that are split by the
magnetization. Flat Majorana surface states connect such split bulk nodal
points. Parallel magnetization $m_y$ lifts nodal points and opens a full gap in
the spectrum. We discuss relevant experiments and propose experimental
verifications of our theory.
The recent discovery of high-$T_{c}$ superconductivity in bilayer nickelate
La$_{3}$Ni$_{2}$O$_{7}$ under high pressure has stimulated great interest
concerning its pairing mechanism. We argue that the weak coupling model from
the almost fully-filled $d_{z^{2}}$ bonding band cannot give rise to its high
$T_{c}$, and thus propose a strong coupling model based on local inter-layer
spin singlets of Ni-$d_{z^{2}}$ electrons due to their strong on-site Coulomb
repulsion. This leads to a minimal effective model that contains local pairing
of $d_{z^{2}}$ electrons and a considerable hybridization with near
quarter-filled itinerant $d_{x^{2}-y^{2}}$ electrons on nearest-neighbor sites.
The strong coupling between two components provides a composite scenario to
achieve high-$T_{c}$ superconductivity. Our theory highlights the importance of
the bilayer structure of superconducting La$_{3}$Ni$_{2}$O$_{7}$ and points out
a potential route for the exploration of more high-$T_{c}$ superconductors.
Quantum coherence of electrons can produce striking behaviors in mesoscopic
conductors, including weak localization and the Aharonov-Bohm effect. Although
magnetic order can also strongly affect transport, the combination of coherence
and magnetic order has been largely unexplored. Here, we examine quantum
coherence-driven universal conductance fluctuations in the antiferromagnetic,
canted antiferromagnetic, and ferromagnetic phases of a thin film of the
topological material MnBi$_2$Te$_4$. In each magnetic phase we extract a charge
carrier phase coherence length of about 100 nm. The conductance
magnetofingerprint is repeatable when sweeping applied magnetic field within
one magnetic phase, but changes when the applied magnetic field crosses the
antiferromagnetic/canted antiferromagnetic magnetic phase boundary.
Surprisingly, in the antiferromagnetic and canted antiferromagnetic phase, but
not in the ferromagnetic phase, the magnetofingerprint depends on the direction
of the field sweep. To explain these observations, we suggest that conductance
fluctuation measurements are sensitive to the motion and nucleation of magnetic
domain walls in MnBi$_2$Te$_4$.
Quantum oscillation (QO), a physical phenomenon that reflects the
characteristics of the Fermi surface and transport fermions, has been
extensively observed in metals and semimetals through various approaches, like
magnetostriction, magnetization, resistivity, and thermoelectric power.
However, only some allowed oscillation frequencies can be revealed by each
individual method, particularly in semimetals with intricate Fermi pockets and
associated magnetic breakdown phenomena. In this paper, we present the
application of an ac composite magnetoelectric (ME) technique to measure the
QOs of a topological nodal-line semimetal, ZrSiS, which possesses six
fundamental QO frequencies. By employing the ME technique with a maximum
magnetic field of 13 T and a minimum temperature of 2 K, we are able to capture
all the fundamental frequencies and most of the permissible magnetic breakdown
frequencies. In comparison, some of the frequencies were missing in the
aforementioned four methods under identical measurement conditions. Remarkably,
a series of magnetic breakdown frequencies around 8000 T were revealed even in
a magnetic field as low as 7.5 T. These findings highlight the ME technique as
an ultrahigh-sensitive tool for studying Dirac Fermions and other topological
semimetals with complex Fermi surfaces.
A hypothetical non-dimerized Cu chain in equilibrium is a spin-\half atom
Mott insulator (AMI), eventhough its band width is high ~ 10 eV. This RVB
reservoir has a large exchange coupling J ~ 2 eV. This idea of, \textit{broad
band Mott localization} was used by us in our earlier works, including
prediction of high Tc superconductivity in doped graphene, silicene and a
theory for hot superconductivity reported in Ag-Au nanostructures (TP 2008). In
the present work we identify possible random AMI subsystems in Cu-Pb Apatite
and develop a model for reported hot superconductivity (LKK 2023). In apatite
structure, network of interstitial columnar spaces run parallel to c-axis and
ab-plane. They accomodate excess copper, as neutral Cu atom clusters, chains
and planar segments. They are our emergent AMI's. Electron transfer from AMI's
to insulating host, generates strong local superconducting correlation, via
phyics of doped Mott insulator. Josephson coupling between doped AMI's,
establishes hot superconductivity. A major Challenge to superconducting order
in real material is competing insulating phases - valence bond solid
(spin-Peirels)-lattice distortions etc. AMI theory points to ways of making the
\textit{elusive superconductivity} palpable. We recommend exploration of hot
superconductivity in the rich world of minerals and insulators, via metal atom
inclusion.
Superconductivity is reformulated as a phenomenon in which a stable velocity
field is created by a $U(1)$ phase neglected by Dirac in the Schroedinger
representation of quantum mechanics. The neglected phase gives rise to a $U(1)$
gauge field expressed as the Berry connection from many-body wave functions.
The inclusion of this gauge field transforms the standard particle-number
non-conserving formalism of superconductivity to a particle-number conserving
one with many results of the former unaltered. In other words, the new
formalism indicates that the current standard one is an approximation that
effectively takes into account this neglected $U(1)$ gauge field by employing
the particle-number non-conserving formalism. Since the standard and new
formalisms are physically different, conflicting results are predicted in some
cases. We reexamine the Josephson relation and show that a capacitance
contribution of the Josephson junction to the $U(1)$ phase is missing in the
standard formalism, and inclusion of it indicates that the standard theory
actually does one agree with the experiment while the new one does. It is also
shown that the dissipative quantum phase transition in Josephson junctions
predicted in the standard theory does not exit in the new one in accordance
with the recent experimental result.
In the past year several constructions of non-invertible symmetries in
Quantum Field Theory in $d\geq 3$ have appeared. In this paper we provide a
unified perspective on these constructions. Central to this framework are
so-called theta defects, which generalize the notion of theta-angles, and allow
the construction of universal and non-universal topological symmetry defects.
We complement this physical analysis by proposing a mathematical framework
(based on higher-fusion categories) that converts the physical construction of
non-invertible symmetries into a concrete computational scheme.
We analyze an analog of the $t$-$J$-$U$ model as applied to the description
of a single moir\'e flat band of twisted WSe$_2$ bilayer. To take into account
the correlation effects induced by a significant strength of the Coulomb
repulsion, we use the Gutzwiller approach and compare it with the results
obtained by the Hartree-Fock method. We discuss in detail the graduate
appearance of a two dome structure of the superconducting state in the phase
diagram by systematically increasing the Coulomb repulsion integral, $U$. The
two superconducting domes residing on both sides of a Mott insulating state can
be reproduced for a realistic parameter range in agreement with the available
experimental data. According to our analysis the paired state has a highly
unconventional character with a mixed $d+id$ (singlet) and $p-ip$ (triplet)
symmetry. Both components of the mixed paired state are of comparable
amplitudes. However, as shown here, a transition between pure singlet and pure
triplet pairing should be possible in the considered system by tuning the gate
voltage, which controls the magnitude of the valley-dependent spin-splitting in
the system.
Spins of electrons in CMOS quantum dots combine exquisite quantum properties
and scalable fabrication. In the age of quantum technology, however, the
metrics that crowned Si/SiO2 as the microelectronics standard need to be
reassessed with respect to their impact upon qubit performance. We chart the
spin qubit variability due to the unavoidable atomic-scale roughness of the
Si/SiO$_2$ interface, compiling experiments in 12 devices, and developing
theoretical tools to analyse these results. Atomistic tight binding and path
integral Monte Carlo methods are adapted for describing fluctuations in devices
with millions of atoms by directly analysing their wavefunctions and electron
paths instead of their energy spectra. We correlate the effect of roughness
with the variability in qubit position, deformation, valley splitting, valley
phase, spin-orbit coupling and exchange coupling. These variabilities are found
to be bounded and lie within the tolerances for scalable architectures for
quantum computing as long as robust control methods are incorporated.
Non-Hermitian band theory distinguishes between line gaps and point gaps.
While point gaps can give rise to intrinsic non-Hermitian band topology without
Hermitian counterparts, line-gapped systems can always be adiabatically
deformed to a Hermitian limit. Here we show that line-gap topology and
point-gap topology can be intricately connected: topological line-gapped
systems in $d$ dimensions induce nontrivial point-gap topology on their
$(d-1)$-dimensional boundaries when suitable internal and spatial symmetries
are present. Since line-gapped systems essentially realize Hermitian
topological phases, this establishes a correspondence between Hermitian bulk
topology and intrinsic non-Hermitian boundary topology. For the correspondence
to hold, no non-Hermitian perturbations are required in the bulk itself, so
that the bulk can be purely Hermitian. Concomitantly, the presence of
non-Hermitian perturbations in the bulk does not affect any results as long as
they do not close the bulk line gap. On the other hand, non-Hermitian
perturbations are essential on the boundary to open a point gap. The
non-Hermitian boundary topology then further leads to higher-order skin modes,
as well as chiral and helical hinge modes, that are protected by point gaps and
hence unique to non-Hermitian systems. We identify all the internal symmetry
classes where bulk line-gap topology induces boundary point-gap topology as
long as an additional spatial symmetry is present, and establish the
correspondence between their topological invariants. There also exist some
symmetry classes where the Hermitian edge states remain stable, in the sense
that even a point gap cannot open on the boundary.
The study of quantum state transfer has led to a variety of research efforts
utilizing quantum simulators. By exploiting the tunability of the qubit
frequency and qubit-qubit coupling, a superconducting qubit chain can simulate
various topological band models. In our study, we demonstrate that a spin-up
state can be transported along a topological qubit chain by modulating the
coupling strengths and the qubit frequencies. We show that the Hilbert space of
the qubit chain can be restricted to the subspace of two edge states in this
process, while the Hamiltonian degenerates into a two-state Landau-Zener (LZ)
model. Furthermore, we prove that the state transfer process in this
topological qubit chain is equivalent to the topological adiabatic passage of
the LZ model. With this analysis, we generalize the state transfer approach
from single-qubit Fock states to two-qubit Bell states.
Magnonics or magnon spintronics is an emerging field focusing on generating,
detecting, and manipulating magnons. As charge-neutral quasi-particles, magnons
are promising information carriers because of their low energy dissipation and
long coherence length. In the past decade, topological phases in magnonics have
attracted intensive attention due to their fundamental importance in
condensed-matter physics and potential applications of spintronic devices. In
this review, we mainly focus on recent progress in topological magnonics, such
as the Hall effect of magnons, magnon Chern insulators, topological magnon
semimetals, etc. In addition, the evidence supporting topological phases in
magnonics and candidate materials are also discussed and summarized. The aim of
this review is to provide readers with a comprehensive and systematic
understanding of the recent developments in topological magnonics.
The Arcsine laws of Brownian motion are a collection of results describing
three different statistical quantities of one-dimensional Brownian motion: the
time at which the process reaches its maximum position, the total time the
process spends in the positive half-space and the time at which the process
crosses the origin for the last time. Remarkably the cumulative probabilities
of these three observables all follows the same distribution, the Arcsine
distribution. But in real systems, space is often heterogeneous, and these laws
are likely to hold no longer. In this paper we explore such a scenario and
study how the presence of a spatial heterogeneity alters these Arcsine laws.
Specifically we consider the case of a thin permeable barrier, which is often
employed to represent diffusion impeding heterogeneities in physical and
biological systems such as multilayer electrodes, electrical gap junctions,
cell membranes and fragmentation in the landscape for dispersing animals. Using
the Feynman-Kac formalism and path decomposition techniques we are able to find
the exact time-dependence of the probability distribution of the three
statistical quantities of interest. We show that a permeable barrier has a
large impact on these distributions at short times, but this impact is less
influential as time becomes long. In particular, the presence of a barrier
means that the three distributions are no longer identical with symmetry about
their means being broken. We also study a closely related statistical quantity,
namely, the distribution of the maximum displacement of a Brownian particle and
show that it deviates significantly from the usual half-Gaussian form.
We consider the Brownian SYK, i.e. a system of $N$ Majorana (Dirac) fermions
with a white-noise $q$-body interaction term. We focus on the dynamics of the
Frame potentials, a measure of the scrambling and chaos, given by the moments
of the overlap between two independent realisations of the model. By means of a
Keldysh path-integral formalism, we compute its early and late-time value. We
show that, for $q>2$, the late time path integral saddle point correctly
reproduces the saturation to the value of the Haar frame potential. On the
contrary, for $q=2$, the model is quadratic and consistently we observe
saturation to the Haar value in the restricted space of Gaussian states
(Gaussian Haar). The latter is characterised by larger system size corrections
that we correctly capture by counting the Goldstone modes of the Keldysh saddle
point.
In this lecture note, we give a basic introduction to the rapidly developing
concepts of generalized symmetries, from the perspectives of both high energy
physics and condensed matter physics. In particular, we emphasize on the
(invertible) higher-form and higher-group symmetries. For the physical
applications, we discuss the geometric engineering of QFTs in string theory and
the symmetry-protected topological (SPT) phases in condensed matter physics.
The lecture note is based on a short course on generalized symmetries,
jointly given by Yi-Nan Wang and Qing-Rui Wang in Feb. 2023, which took place
at School of Physics, Peking University
(https://indico.ihep.ac.cn/event/18796/).
Thermal rectifiers are devices that have different thermal conductivities in
opposing directions of heat flow. The realization of practical thermal
rectifiers relies significantly on a sound understanding of the underlying
mechanisms of asymmetric heat transport, and two-dimensional materials offer a
promising opportunity in this regard owing to their simplistic structures
together with a vast possibility of tunable imperfections. However, the
in-plane thermal rectification mechanisms in 2D materials like graphene having
directional gradients of grain sizes have remained elusive. In fact,
understanding the heat transport mechanisms in polycrystalline graphene, which
are more practical to synthesize than large-scale single-crystal graphene,
could potentially allow a unique opportunity to combine with other defects and
designs for effective optimization of the thermal rectification property. In
this work, we investigated the thermal rectification behavior in periodic
atomistic models of polycrystalline graphene whose grain arrangements were
generated semi-stochastically in order to have different gradient grain-density
distributions along the in-plane heat flow direction. We employed the centroid
Voronoi tessellation technique to generate realistic grain boundary structures
for graphene, and the non-equilibrium molecular dynamics simulations method was
used to calculate the thermal conductivities and thermal rectification values.
Additionally, detailed phonon characteristics and propagating phonon spatial
energy densities were analyzed based on the fluctuation-dissipation theory to
elucidate the competitive interplay between two underlying mechanisms that
determine the degree of asymmetric heat flow in graded polycrystalline
graphene.
Chirality is an indispensable concept that pervades fundamental science and
nature, manifesting itself in diverse forms such as chiral quasiparticles and
chiral structures. Of particular interest are Weyl phonons carrying specific
Chern numbers and chiral phonons doing circular motions in crystals. Up to now,
Weyl and chiral phonons have been studied independently and the interpretations
of chirality seem to be different in these two concepts, impeding our
understanding. Here, we demonstrate that Weyl and chiral phonons are entangled
in chiral crystals. Employing a typical chiral crystal of elementary tellurium
(Te) as a case study, we expound on the intrinsic relationship between Chern
number of Weyl phonons and pseudo-angular momentum (PAM) of chiral phonons. In
light of the mutual coupling, we propose Raman scattering as a new technique to
demonstrate the existence of Weyl phonons in Te, by detecting the
chirality-induced energy splitting between the two constituent chiral phonon
branches for Weyl phonons. By using the same experimental approach, we also
observe the obstructed phonon surface states for the first time.
Spins in semiconductor quantum dots hold great promise as building blocks of
quantum processors. Trapping them in SiMOS transistor-like devices eases future
industrial scale fabrication. Among the potentially scalable readout solutions,
gate-based dispersive radiofrequency reflectometry only requires the already
existing transistor gates to readout a quantum dot state, relieving the need
for additional elements. In this effort towards scalability, traveling-wave
superconducting parametric amplifiers significantly enhance the readout
signal-to-noise ratio (SNR) by reducing the noise below typical cryogenic
low-noise amplifiers, while offering a broad amplification band, essential to
multiplex the readout of multiple resonators. In this work, we demonstrate a
3GHz gate-based reflectometry readout of electron charge states trapped in
quantum dots formed in SiMOS multi-gate devices, with SNR enhanced thanks to a
Josephson traveling-wave parametric amplifier (JTWPA). The broad, tunable 2GHz
amplification bandwidth combined with more than 10dB ON/OFF SNR improvement of
the JTWPA enables frequency and time division multiplexed readout of interdot
transitions, and noise performance near the quantum limit. In addition, owing
to a design without superconducting loops and with a metallic ground plane, the
JTWPA is flux insensitive and shows stable performances up to a magnetic field
of 1.2T at the quantum dot device, compatible with standard SiMOS spin qubit
experiments.
A central task in finite-time thermodynamics is to minimize the excess or
dissipated work, $W_{\rm diss}$, when manipulating the state of a system
immersed in a thermal bath. We consider this task for an $N$-body system, whose
constituents are identical and uncorrelated at the beginning and end of the
process. In the regime of slow but finite-time processes, we show that $W_{\rm
diss}$ can be dramatically reduced by considering collective protocols in which
interactions are suitably created along the protocol. This can even lead to a
sub-linear growth of $W_{\rm diss}$ with $N$: $W_{\rm diss}\sim N^x$ with
$x<1$; to be contrasted to the expected $W_{\rm diss}\sim N$ satisfied in any
non-interacting protocol. We derive the fundamental limits to such collective
advantages and show that $x=0$ is in principle possible, which however requires
highly non-local $N$-body interactions. We then explore collective processes
with realistic many-body interacting models, in particular a 1D spin chain and
an all-to-all spin model, achieving noticeable gains under realistic levels of
control. As an application of these results, we focus on the erasure of
information in finite time, and prove a faster convergence to Landauer's
erasure bound.

Date of feed: Thu, 03 Aug 2023 00:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **Lieb-Schultz-Mattis anomalies and web of dualities induced by gauging in quantum spin chains. (arXiv:2308.00743v1 [cond-mat.str-el])**

Ömer M. Aksoy, Christopher Mudry, Akira Furusaki, Apoorv Tiwari

**Quadratic Dirac fermions and the competition of ordered states in twisted bilayer graphene. (arXiv:2308.00748v1 [cond-mat.str-el])**

Julian Ingham, Tommy Li, Mathias S. Scheurer, Harley D. Scammell

**Manipulating Topological Quantum Phase Transitions of Kitaev's Quantum Spin Liquids with Electric Fields. (arXiv:2308.00760v1 [cond-mat.str-el])**

Pureum Noh, Kyusung Hwang, Eun-Gook Moon

**Lack of near-sightedness principle in non-Hermitian systems. (arXiv:2308.00776v1 [cond-mat.mes-hall])**

Helene Spring, Viktor Könye, Anton R. Akhmerov, Ion Cosma Fulga

**Strong-coupling phases of trions and excitons in electron-hole bilayers at commensurate densities. (arXiv:2308.00825v1 [cond-mat.str-el])**

David D. Dai, Liang Fu

**Interaction-driven (quasi-) insulating ground states of gapped electron-doped bilayer graphene. (arXiv:2308.00827v1 [cond-mat.str-el])**

Anna M. Seiler, Martin Statz, Isabell Weimer, Nils Jacobsen, Kenji Watanabe, Takashi Taniguchi, Zhiyu Dong, Leonid S. Levitov, R. Thomas Weitz

**Giant superconducting diode effect in ion-beam patterned Sn-based superconductor nanowire / topological Dirac semimetal planar heterostructures. (arXiv:2308.00893v1 [cond-mat.supr-con])**

Keita Ishihara, Le Duc Anh, Tomoki Hotta, Kohdai Inagaki, Masaki Kobayashi, Masaaki Tanaka

**Selectable diffusion direction with topologically protected edge modes. (arXiv:2308.00902v1 [cond-mat.mes-hall])**

Keita Funayama, Jun Hirotani, Atsushi Miura, Hiroya Tanaka

**Searching for Majorana quasiparticles at vortex cores in iron-based superconductors. (arXiv:2308.00930v1 [cond-mat.supr-con])**

Tadashi Machida, Tetsuo Hanaguri

**Direction-sensitive graphene flow sensor. (arXiv:2308.00965v1 [physics.app-ph])**

P. Kaźmierczak, J. Binder, K. Boryczko, T. Ciuk, W. Strupiński, R. Stępniewski, A. Wysmołek

**Quantized Thermal Hall Conductance and the Topological Phase Diagram of a Superconducting Bismuth Bilayer. (arXiv:2308.01021v1 [cond-mat.mes-hall])**

Szczepan Głodzik, Nicholas Sedlmayr

**Magnetization control of the nematicity direction and nodal points in a superconducting doped topological insulator. (arXiv:2308.01081v1 [cond-mat.supr-con])**

D. A. Khokhlov, R. S. Akzyanov, A. V. Kapranov

**Minimal effective model and possible high-$T_{c}$ mechanism for superconductivity of La$_{3}$Ni$_{2}$O$_{7}$ under high pressure. (arXiv:2308.01176v1 [cond-mat.supr-con])**

Yi-feng Yang, Guang-Ming Zhang, Fu-Chun Zhang

**Universal conductance fluctuations in a MnBi$_2$Te$_4$ thin film. (arXiv:2308.01183v1 [cond-mat.mes-hall])**

Molly P. Andersen, Evgeny Mikheev, Ilan T. Rosen, Lixuan Tai, Peng Zhang, Kang L. Wang, Marc A. Kastner, David Goldhaber-Gordon

**Comprehensive investigation of Quantum Oscillations in Semimetal Using an ac Composite Magnetoelectric Technique with Ultrahigh Sensitivity. (arXiv:2308.01212v1 [cond-mat.str-el])**

Long Zhang, Tianyang Wang, Yugang Zhang, Shuang Liu, Yuping Sun, Xiaoyuan Zhou, Young Sun, Mingquan He, Aifeng Wang, Xuan Luo, Yisheng Chai

**Broad Band Mott Localization is all you need for Hot Superconductivity: Atom Mott Insulator Theory for Cu-Pb Apatite. (arXiv:2308.01307v1 [cond-mat.supr-con])**

G. Baskaran

**Neglected $U(1)$ phase in the Schroedinger representation of quantum mechanics and particle number conserving formalisms for superconductivity. (arXiv:2211.08759v3 [cond-mat.supr-con] UPDATED)**

Hiroyasu Koizumi

**Unifying Constructions of Non-Invertible Symmetries. (arXiv:2212.06159v2 [hep-th] UPDATED)**

Lakshya Bhardwaj, Sakura Schafer-Nameki, Apoorv Tiwari

**Mixed singlet-triplet superconducting state within the moir\'e $t$-$J$-$U$ model as applied to the description of twisted WSe$_2$ bilayer. (arXiv:2302.13841v2 [cond-mat.str-el] UPDATED)**

M. Zegrodnik, A. Biborski

**Bounds to electron spin qubit variability for scalable CMOS architectures. (arXiv:2303.14864v2 [quant-ph] UPDATED)**

Jesús D. Cifuentes, Tuomo Tanttu, Will Gilbert, Jonathan Y. Huang, Ensar Vahapoglu, Ross C. C. Leon, Santiago Serrano, Dennis Otter, Daniel Dunmore, Philip Y. Mai, Frédéric Schlattner, MengKe Feng, Kohei Itoh, Nikolay Abrosimov, Hans-Joachim Pohl, Michael Thewalt, Arne Laucht, Chih Hwan Yang, Christopher C. Escott, Wee Han Lim, Fay E. Hudson, Rajib Rahman, Andrew S. Dzurak, Andre Saraiva

**Hermitian Bulk -- Non-Hermitian Boundary Correspondence. (arXiv:2304.03742v2 [cond-mat.mes-hall] UPDATED)**

Frank Schindler, Kaiyuan Gu, Biao Lian, Kohei Kawabata

**Topological edge state transfer via topological adiabatic passage. (arXiv:2305.14529v3 [quant-ph] UPDATED)**

Chong Wang, Xiu Gu, Shu Chen, Yu-xi Liu

**Topological Phases in Magnonics. (arXiv:2305.14861v2 [cond-mat.mes-hall] UPDATED)**

Fengjun Zhuo, Jian Kang, Aurélien Manchon, Zhenxiang Cheng

**Extreme Value Statistics and Arcsine Laws of Brownian Motion in the Presence of a Permeable Barrier. (arXiv:2306.03157v2 [cond-mat.stat-mech] UPDATED)**

Toby Kay, Luca Giuggioli

**Frame potential of Brownian SYK model of Majorana and Dirac fermions. (arXiv:2306.11160v2 [cond-mat.dis-nn] UPDATED)**

Anastasiia Tiutiakina, Andrea De Luca, Jacopo De Nardis

**Lecture Notes on Generalized Symmetries and Applications. (arXiv:2307.09215v2 [hep-th] UPDATED)**

Ran Luo, Qing-Rui Wang, Yi-Nan Wang

**Competing mechanisms govern the thermal rectification behavior in semi-stochastic polycrystalline graphene with graded grain-density distribution. (arXiv:2307.12940v2 [cond-mat.mtrl-sci] UPDATED)**

Simanta Lahkar, Raghavan Ranganathan

**Weyl phonons in chiral crystals. (arXiv:2307.13378v2 [cond-mat.mtrl-sci] UPDATED)**

Tiantian Zhang, Zhiheng Huang, Zitian Pan, Luojun Du, Guangyu Zhang, Shuichi Murakami

**Broadband parametric amplification for multiplexed SiMOS quantum dot signals. (arXiv:2307.14717v2 [cond-mat.mes-hall] UPDATED)**

Victor Elhomsy, Luca Planat, David J. Niegemann, Bruna Cardoso-Paz, Ali Badreldin, Bernhard Klemt, Vivien Thiney, Renan Lethiecq, Eric Eyraud, Matthieu C. Dartiailh, Benoit Bertrand, Heimanu Niebojewski, Christopher Bäuerle, Maud Vinet, Tristan Meunier, Nicolas Roch, Matias Urdampilleta

**Collective advantages in finite-time thermodynamics. (arXiv:2306.16534v2 [quant-ph] CROSS LISTED)**

Alberto Rolandi, Martí Perarnau-Llobet

Found 8 papers in prb We report magnetic and transport properties of single-crystalline ${\mathrm{EuZn}}_{2}{\mathrm{P}}_{2}$, which has trigonal ${\mathrm{CaAl}}_{2}{\mathrm{Si}}_{2}$-type crystal structure and orders antiferromagnetically at $≈23\phantom{\rule{4pt}{0ex}}\mathrm{K}$. Easy $ab$-plane magneto-crystalline … We discuss the macroscopic behavior of the superfluid $^{3}\mathrm{He}$ phase (pair density wave phase) with a spatially modulated pair density wave recently observed experimentally. As an order parameter we assume, based on the experimental results and a Landau-type model, a variation of the phase … We study the low-energy physics of the critical ($2+1$)-dimensional random transverse-field Ising model. The one-dimensional version of the model is a paradigmatic example of a system governed by an infinite-randomness fixed point, for which many results on the distributions of observables are known… We use stochastic expansion and exact diagonalization to study magic-angle twisted bilayer graphene (TBG) on a disordered substrate. We show that the substrate-induced strong Coulomb disorder in TBG with the chemical potential at the level of the flat bands drives the system to a network of weakly c… Two global symmetries are The implementation of topology on photonics has opened new functionalities of photonic systems, such as the topologically protected boundary photonic modes. In this study, we investigate topological plasmonics in a graphene lattice arrayed with metal nanoparticles and irradiated by a polarized light… Topological phases are greatly enriched by including non-Hermiticity. While most works focus on the topology of the eigenvalues and eigenstates, how topologically nontrivial non-Hermitian systems behave in dynamics has only drawn limited attention. Here, we consider a breathing honeycomb lattice kno… The speed of sound and flexural phonons in two-dimensional materials depends strongly on the tension in these ultraflexible membranes. Here, the authors experimentally demonstrate that freestanding graphene membranes cool down 33% faster when increasing tension by electrostatic gating. They attribute this effect mainly to improved acoustic impedance match of flexural phonons at the boundaries of the membrane and thus provide a route towards electronic devices and circuits for high-speed control of nanoscale heat transport.

Date of feed: Thu, 03 Aug 2023 03:17:07 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **Superexchange interaction in insulating ${\mathrm{EuZn}}_{2}{\mathrm{P}}_{2}$**

Karan Singh, Shovan Dan, A. Ptok, T. A. Zaleski, O. Pavlosiuk, P. Wiśniewski, and D. Kaczorowski

Author(s): Karan Singh, Shovan Dan, A. Ptok, T. A. Zaleski, O. Pavlosiuk, P. Wiśniewski, and D. Kaczorowski

[Phys. Rev. B 108, 054402] Published Wed Aug 02, 2023

**Macroscopic dynamics of superfluid $^{3}\mathrm{He}$ with a spatially modulated pair density wave**

Harald Pleiner and Helmut R. Brand

Author(s): Harald Pleiner and Helmut R. Brand

[Phys. Rev. B 108, 054502] Published Wed Aug 02, 2023

**Random geometry at an infinite-randomness fixed point**

Akshat Pandey, Aditya Mahadevan, and Aditya Cowsik

Author(s): Akshat Pandey, Aditya Mahadevan, and Aditya Cowsik

[Phys. Rev. B 108, 064201] Published Wed Aug 02, 2023

**Strange metal phase of disordered magic-angle twisted bilayer graphene at low temperatures: From flat bands to weakly coupled Sachdev-Ye-Kitaev bundles**

Chenan Wei (魏晨岸) and Tigran A. Sedrakyan

Author(s): Chenan Wei (魏晨岸) and Tigran A. Sedrakyan

[Phys. Rev. B 108, 064202] Published Wed Aug 02, 2023

**Holographic theory for continuous phase transitions: Emergence and symmetry protection of gaplessness**

Arkya Chatterjee and Xiao-Gang Wen

Author(s): Arkya Chatterjee and Xiao-Gang Wen*holoequivalent* if their algebras of local symmetric operators are isomorphic. A holoequivalent class of global symmetries is described by a topological order (TO) in one higher dimension (called symmetry TO), which leads to a symmetry/topological-order (Symm/TO) corresponde…

[Phys. Rev. B 108, 075105] Published Wed Aug 02, 2023

**Light controlled topological plasmonics in a graphene lattice arrayed by metal nanoparticles**

Lu Zhang, Xi-Ming Wang, Xin-Miao Qiu, Zhigang Wang, and Jie-Yun Yan

Author(s): Lu Zhang, Xi-Ming Wang, Xin-Miao Qiu, Zhigang Wang, and Jie-Yun Yan

[Phys. Rev. B 108, 085402] Published Wed Aug 02, 2023

**Spin-dependent gain and loss in photonic quantum spin Hall systems**

Tian-Rui Liu, Kai Bai, Jia-Zheng Li, Liang Fang, Duanduan Wan, and Meng Xiao

Author(s): Tian-Rui Liu, Kai Bai, Jia-Zheng Li, Liang Fang, Duanduan Wan, and Meng Xiao

[Phys. Rev. B 108, L081101] Published Wed Aug 02, 2023

**Tuning heat transport in graphene by tension**

H. Liu, M. Lee, M. Šiškins, H. S. J. van der Zant, P. G. Steeneken, and G. J. Verbiest

Author(s): H. Liu, M. Lee, M. Šiškins, H. S. J. van der Zant, P. G. Steeneken, and G. J. Verbiest

[Phys. Rev. B 108, L081401] Published Wed Aug 02, 2023

Found 1 papers in nano-lett

Date of feed: Wed, 02 Aug 2023 13:13:53 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **[ASAP] Hierarchically Plied Mechano-Electrochemical Energy Harvesting Using a Scalable Kinematic Sensing Textile Woven from a Graphene-Coated Commercial Cotton Yarn**

Juwan Kim, Jun Ho Noh, Sungwoo Chun, Seon Jeong Kim, Hyeon Jun Sim, and Changsoon ChoiNano LettersDOI: 10.1021/acs.nanolett.3c02221

Found 1 papers in science-adv

Date of feed: Wed, 02 Aug 2023 19:08:54 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **Determination of the preferred epitaxy for III-nitride semiconductors on wet-transferred graphene**

Fang Liu, Tao Wang, Xin Gao, Huaiyuan Yang, Zhihong Zhang, Yucheng Guo, Ye Yuan, Zhen Huang, Jilin Tang, Bowen Sheng, Zhaoying Chen, Kaihui Liu, Bo Shen, Xin-Zheng Li, Hailin Peng, Xinqiang Wang

Science Advances, Volume 9, Issue 31, August 2023.

Found 2 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]+) **Adiabatic topological photonic interfaces**

< author missing >

**Unraveling surface structures of gallium promoted transition metal catalysts in CO2 hydrogenation**

< author missing >