Found 28 papers in cond-mat Limits on a system's response to external perturbations inform our
understanding of how physical properties can be shaped by microscopic
characteristics. Here, we derive constraints on the steady-state nonequilibrium
response of physical observables in terms of the topology of the microscopic
state space and the strength of thermodynamic driving. Notably, evaluation of
these limits requires no kinetic information beyond the state-space structure.
When applied to models of receptor binding, we find that sensitivity is bounded
by the steepness of a Hill function with a Hill coefficient enhanced by the
chemical driving beyond the structural equilibrium limit.
Landau's quasiparticle formalism is generalized to describe a wide class of
strongly correlated Fermi systems, in addition to conventional Fermi liquids.
This class includes (i) so-called marginal exemplars and (ii) systems that
harbor interaction-driven flat bands, in both of which manifestations of
non-Fermi-liquid behavior are well documented. Specifically, the advent of such
flat bands is attributed to a spontaneous topological rearrangement of the
Landau state that supplements the conventional Landau quasiparticle picture
with a different set of quasiparticles, the so-called fermion condensate, whose
single-particle spectrum is dispersionless. The celebrated Landau-Luttinger
theorem can then be extended to marginal Fermi liquids, in which the density of
the augmented quasiparticle system is shown to coincide with the particle
density. Moreover, the total density of systems hosting interaction-driven flat
bands is shown to be the sum of the densities of the two quasiparticle
subsystems: the Landau-like component and the fermion condensate. It is
demonstrated that the formalism thus introduced serves to clarify the non-BCS
nature of exotic superconductivity.
We experimentally and theoretically study the dynamics of a one-dimensional
array of pendula with a mild spatial gradient in their self-frequency and where
neighboring pendula are connected with weak and alternating coupling. We map
their dynamics to the topological Su-Schrieffer-Heeger (SSH) model of charged
quantum particles on a lattice with alternating hopping rates in an external
electric field. By directly tracking the dynamics of a wavepacket in the bulk
of the lattice, we observe Bloch oscillations, Landau-Zener transitions, and
coupling between the isospin (i.e. the inner wave function distribution within
the unit cell) and the spatial degrees of freedom (the distribution between
unit cells). We then use Bloch oscillations in the bulk to directly measure the
non-trivial global topological phase winding and local geometric phase of the
band. We measure an overall evolution of 3.1 $\pm$ 0.2 radians for the
geometrical phase during the Bloch period, consistent with the expected Zak
phase of $\pi$. Our results demonstrate the power of classical analogs of
quantum models to directly observe the topological properties of the band
structure, and sheds light on the similarities and the differences between
quantum and classical topological effects.
We clarify the nature of hafnia as a proper ferroelectric and show that there
is a shallow double well involving a single soft polar mode as in well-known
classic ferroelectrics. Using symmetry analysis, density-functional theory
(DFT) structural optimizations with and without epitaxial strain, and density
functional perturbation theory (DFPT), we examine several important possible
hafnia structures derived ultimately from the cubic fluorite structure,
including baddeleyite (P$2_{1}/c$), tetragonal antiferroelectric P4$_2$nmc,
Pbca (nonpolar and brookite), and ferroelectric rhombohedral ($R3m$),
Pmn2$_{1}$ and Pca2$_{1}$ structures. The latter is considered to be the most
likely ferroelectric phase seen experimentally, and has an antiferroelectric
parent with space group Pbcn, with a single unstable polar mode and a shallow
double well with a well depth of 24 meV/atom. Strain is not required for
switching or other ferroelectric properties, nor is coupling of the soft-mode
with any other modes within the ferroelectric Pca2$_{1}$ phase.
Alkali antimonide semiconductor photocathodes provide a promising platform
for the generation of high brightness electron beams, which are necessary for
the development of cutting-edge probes including x-ray free electron lasers and
ultrafast electron diffraction. However, to harness the intrinsic brightness
limits in these compounds, extrinsic degrading factors, including surface
roughness and contamination, must be overcome. By exploring the growth of CsxSb
thin films monitored by in situ electron diffraction, the conditions to
reproducibly synthesize atomically smooth films of CsSb on 3C-SiC (100) and
graphene coated TiO2 (110) substrates are identified, and detailed structural,
morphological, and electronic characterization is presented. These films
combine high quantum efficiency in the visible (up to 1.2% at 400 nm), an
easily accessible photoemission threshold of 550 nm, low surface roughness
(down to 600 pm on a 1 um scale), and a robustness against oxidation up to 15
times greater then Cs3Sb. These properties suggest that CsSb has the potential
to operate as an alternative to Cs$_3$Sb in electron source applications where
the demands of the vacuum environment might otherwise preclude the use of
traditional alkali antimonides.
Despite recent intensive research on topological aspects of open quantum
systems, effects of strong interactions have not been sufficiently explored. In
this paper, we demonstrate that interactions induce the Liouvillian skin effect
by analyzing a one-dimensional correlated model with two-body loss. We show
that, in the presence of interactions, eigenmodes and eigenvalues of the
Liouvillian strongly depend on boundary conditions. Specifically, we find that
interactions induce localization of eigenmodes of the Liouvillian around the
right edge under open boundary conditions. To characterize the Liouvllian skin
effect, we define the topological invariant by using the Liouvillian
superoperator. Then, we numerically confirm that the topological invariant
captures the Liouvillian skin effect. Furthermore, the presence of the
localization of eigenmodes results in the unique dynamics observed only under
open boundary conditions: particle accumulation at the right edge in transient
dynamics. Our result paves the way to realize topological phenomena in open
quantum systems induced by strong interactions.
A plethora of two-dimensional (2D) materials entered the physics and
engineering scene in the last two decades. Their robust, membrane-like sheet
permit -- mostly require -- deposition, giving rise to solid-solid dry
interfaces whose bodily mobility, pinning, and general tribological properties
under shear stress are currently being understood and controlled,
experimentally and theoretically. In this Colloquium we use simulation case
studies of twisted graphene system as a prototype workhorse tool to demonstrate
and discuss the general picture of 2D material interface sliding. First, we
highlight the crucial mechanical difference, often overlooked, between small
and large incommensurabilities, corresponding e.g., to small and large twist
angles in graphene interfaces. In both cases, focusing on flat, structurally
lubric, "superlubric" geometries, we elucidate and review the generally
separate scaling with area of static friction in pinned states and of kinetic
friction during sliding, tangled as they are with the effects of velocity,
temperature, load, and defects. Including the role of island boundaries and of
elasticity, and corroborating when possible the existing case-by-case results
in literature beyond graphene, the overall picture proposed is meant for
general 2D material interfaces, that are of importance for the physics and
technology of existing and future bilayer and multilayer systems.
Axion insulators are 3D magnetic higher-order topological insulators
protected by inversion-symmetry that exhibit hinge-localized chiral channels
and induce quantized topological magnetoelectric effects. Recent research has
suggested that axion insulators may be capable of detecting dark-matter
axion-like particles by coupling to their axionic excitations. Beyond its
fundamental theoretical interest, designing a photonic AXI offers the potential
to enable the development of magnetically-tunable photonic switch devices
through the manipulation of the axionic modes and their chiral propagation
using external magnetic fields. Motivated by these facts, in this work, we
propose a novel approach to induce axionic band topology in gyrotropic 3D Weyl
photonic crystals gapped by supercell modulation. To quantize an axionic angle,
we create domain-walls across inversion-symmetric photonic crystals,
incorporating a phase-obstruction in the supercell modulation of their
dielectric elements. This allows us to bind chiral channels on
inversion-related hinges, ultimately leading to the realization of an axionic
chiral channel of light. Moreover, by controlling the material gyrotropic
response, we demonstrate a physically accessible way of manipulating the
axionic modes through a small external magnetic bias, which provides an
effective topological switch between different 1D chiral photonic fiber
configurations. Remarkably, the unidirectional axionic hinge states supported
by the photonic axion insulator are buried in a fully connected 3D dielectric
structure, thereby being protected from radiation through the electromagnetic
continuum. As a result, they are highly suitable for applications in
guided-light communication, where the preservation and non-reciprocal
propagation of photonic signals are of paramount importance.
We investigate the non-Hermitian Haldane model on hyperbolic $\{8, 3\}$ and
$\{12, 3\}$ lattices, and showcase its intriguing topological properties in the
simultaneous presence of non-Hermitian effect and hyperbolic geometry. From
bulk descriptions of the system, we calculate the real space non-Hermitian
Chern numbers by generalizing the method from its Hermitian counterpart and
present corresponding phase diagram of the model. For boundaries, we find that
skin-topological modes appear in the range of the bulk energy gap under certain
boundary conditions, which can be explained by an effective one-dimensional
zigzag chain model mapped from hyperbolic lattice boundary. Remarkably, these
skin-topological modes are localized at specific corners of the boundary,
constituting a hybrid higher-order skin-topological effect on hyperbolic
lattices.
Kekul\'e-O order in graphene, which has recently been realized
experimentally, induces Dirac electron masses on the order of $m \sim
100\text{meV}$. We show that twisted bilayer graphene in which one or both
layers have Kekul\'e-O order exhibits nontrivial flat electronic bands on
honeycomb and kagome lattices. When only one layer has Kekul\'e-O order, there
is a parameter regime for which the lowest four bands at charge neutrality form
an isolated two-orbital honeycomb lattice model with two flat bands. The
bandwidths are minimal at a magic twist angle $\theta \approx 0.7^\circ$ and
Dirac mass $m \approx 100\text{meV}$. When both layers have Kekul\'e-O order,
there is a large parameter regime around $\theta\approx 1^\circ$ and $m\gtrsim
100\text{meV}$ in which the lowest three valence and conduction bands at charge
neutrality each realize isolated kagome lattice models with one flat band,
while the next three valence and conduction bands are flat bands on triangular
lattices. These flat band systems may provide a new platform for strongly
correlated phases of matter.
Dirac materials have been proposed as a new class of electron-based detectors
for light dark-matter (DM) scattering or absorption, with predicted
sensitivities far exceeding superconductors and superfluid helium. The
superiority of Dirac materials originates from a significantly reduced
in-medium dielectric response winning over the suppression of DM scattering
owing to the limited phase space at the point-like Fermi surface. Here we
propose a new route to enhance significantly the DM detection efficiency via
strongly correlated topological semimetals. Specifically, by considering a
strongly correlated Weyl semimetal model system, we demonstrate that the strong
correlation-induced flatband effects can amplify the coupling and detection
sensitivity to light DM particles by expanding the scattering phase space,
while maintaining a weak dielectric in-medium response.
Many recipes for realizing topological superconductivity rely on broken
time-reversal symmetry, which is often attained by applying a substantial
external magnetic field. Alternatively, using magnetic materials can offer
advantages through low-field operation and design flexibility on the nanoscale.
Mechanisms for lifting spin degeneracy include exchange coupling,
spin-dependent scattering, spin injection-all requiring direct contact between
the bulk or induced superconductor and a magnetic material. Here, we implement
locally broken time-reversal symmetry through dipolar coupling from nearby
micromagnets to superconductor-semiconductor hybrid nanowire devices. Josephson
supercurrent is hysteretic due to micromangets switching. At or around zero
external magnetic field, we observe an extended presence of Andreev bound
states near zero voltage bias. We also show a zero-bias peak plateau of a
non-quantized value. Our findings largely reproduce earlier results where
similar effects were presented in the context of topological superconductivity
in a homogeneous wire, and attributed to more exotic time-reversal breaking
mechanisms [1]. In contrast, our stray field profiles are not designed to
create Majorana modes, and our data are compatible with a straightforward
interpretation in terms of trivial states in quantum dots. At the same time,
the use of micromagnets in hybrid superconductor-semiconductor devices shows
promise for future experiments on topological superconductivity.
Thermodynamic irreversibility is a crucial property of living matter.
Irreversible processes maintain spatiotemporally complex structures and
functions characteristic of living systems. Robust and general quantification
of irreversibility remains a challenging task due to nonlinearities and
influences of many coupled degrees of freedom. Here we use deep learning to
reveal tractable, low-dimensional representations of patterns in a canonical
protein signaling process -- the Rho-GTPase system -- as well as complex
Ginzburg-Landau dynamics. We show that our representations recover activity
levels and irreversibility trends for a range of patterns. Additionally, we
find that our irreversibility estimates serve as a dynamical order parameter,
distinguishing stable and chaotic dynamics in these nonlinear systems. Our
framework leverages advances in deep learning to quantify the nonequilibrium
and nonlinear behavior of complex living processes.
Three-dimensional topological Dirac semimetals have recently gained
significant attention, since they possess exotic quantum states. When
constructing Josephson junctions utilizing these materials as the weak link,
the fractional ac Josephson effect emerges in the presence of a topological
supercurrent contribution. We investigate the ac Josephson effect in a Dirac
semimetal Cd$_3$As$_2$ nanowire using two complementary methods: by probing the
radiation spectrum and by measuring Shapiro patterns. With both techniques, we
find that conventional supercurrent dominates at all investigated doping levels
and that any potentially present topological contribution falls below our
detection threshold. The inclusion of thermal noise in a resistively and
capacitively shunted junction (RCSJ) model allows us to reproduce the microwave
characteristics of the junction. With this refinement, we explain how weak
superconducting features can be masked and provide a framework to account for
elevated electronic temperatures present in realistic experimental scenarios.
The emergence of a quantum spin liquid (QSL), a state of matter that can
result when electron spins are highly correlated but do not become ordered, has
been the subject of a considerable body of research in condensed matter
physics. Spin liquid states have been proposed as hosts for high-temperature
superconductivity and can host topological properties with potential
applications in quantum information science. The excitations of most quantum
spin liquids are not conventional spin waves but rather quasiparticles known as
spinons, whose existence is well established experimentally only in
one-dimensional systems; the unambiguous experimental realization of QSL
behavior in higher dimensions remains challenging. Here we investigate the
novel compound YbZn2GaO5, which hosts an ideal triangular lattice of effective
spin-1/2 moments with no inherent chemical disorder. Thermodynamic and
inelastic neutron scattering (INS) measurements performed on high-quality
single crystal samples of YbZn2GaO5 exclude the possibility of long-range
magnetic ordering down to 60 mK, demonstrate a quadratic power law for the heat
capacity and reveal a continuum of magnetic excitations in parts of the
Brillouin zone. Both low-temperature thermodynamics and INS spectra suggest
that YbZn2GaO5 is a U(1) Dirac QSL with gapless spinon excitations concentrated
at certain points in the Brillouin zone, and additional features in INS are
also consistent with theoretical expectations for a Dirac QSL on the triangular
lattice.
By using the constrained-phase quantum Monte Carlo method, we performed a
systematic study of the ground state of the half filled Hubbard model for a
trilayer honeycomb lattice. We analyze the effect of the perpendicular electric
field on the electronic structure, magnetic property and pairing correlations.
It is found that the antiferromagnetism is suppressed by the perpendicular
electric field, especially the long-range parts, and the dominant magnetic
fluctuations are still antiferromagnetic. The electronic correlation drives a
$d+id$ superconducting pairing to be dominant over other pairing patterns among
various electric fields and interaction strengths. We also found that the
$d+id$ pairing correlation is greatly enhanced as the on-site Coulomb
interaction is increased. Our intensive numerical results may unveil the nature
of the recently observed superconductivity in rhombohedral trilayer graphene
under an electric field.
The duration of bidirectional transfer protocols in 1D topological models
usually scales exponentially with distance. In this work, we propose transfer
protocols in multidomain SSH chains and Creutz ladders that lose the
exponential dependence, greatly speeding up the process with respect to their
single-domain counterparts, reducing the accumulation of errors and drastically
increasing their performance, even in the presence of symmetry-breaking
disorder. We also investigate how to harness the localization properties of the
Creutz ladder-with two localized modes per domain wall-to choose the two states
along the ladder that will be swapped during the transfer protocol, without
disturbing the states located in the intermediate walls between them. This
provides a 1D network with all-to-all connectivity that can be helpful for
quantum information purposes.
We study why in quantum many-body systems the adiabatic fidelity and the
overlap between the initial state and instantaneous ground states have nearly
the same values in many cases. We elaborate on how the problem may be explained
by an interplay between the two intrinsic limits of many-body systems: the
limit of small values of evolution parameter and the limit of large system
size. In the former case, conventional perturbation theory provides a natural
explanation. In the latter case, a crucial observation is that pairs of vectors
lying in the complementary Hilbert space of the initial state are almost
orthogonal. Our general findings are illustrated with a driven Rice-Mele model
and a driven interacting Kitaev chain model, two paradigmatic models of driven
many-body systems.
On-chip demagnetization refrigeration has recently emerged as a powerful tool
for reaching microkelvin electron temperatures in nanoscale structures. The
relative importance of cooling on-chip and off-chip components and the thermal
subsystem dynamics are yet to be analyzed. We study a Coulomb blockade
thermometer with on-chip copper refrigerant both experimentally and
numerically, showing that dynamics in this device are captured by a
first-principles model. Our work shows how to simulate thermal dynamics in
devices down to microkelvin temperatures, and outlines a recipe for a
low-investment platform for quantum technologies and fundamental nanoscience in
this novel temperature range.
Second-order nonlinear optical responses, including photogalvanic effect
(PGE) and second harmonic generation (SHG), are important physical phenomena in
nonlinear optics. The PGE (SHG) related to linearly and circularly polarized
light are called the linear and circular PGE (LPGE and CPGE) [linear and
circular SHG (LSHG and CSHG)], respectively. In this work, we use the quantum
kinetics under relaxation time approximation to study the dependence of
second-order nonlinear optical responses on Fermi level and frequency under
different out-of-plane electric fields in WTe$_2$ monolayer from radio to
infrared region. We find that the maximum frequency at which the Berry
curvature dipole mechanism for the nonlinear Hall effect plays a major role is
about 1 THz. In radio and microwave regions, two large peaks of nonlinear
conductivities occur when the Fermi level is equal to the energy corresponding
to gap-opening points. In terms of frequency, in radio region, LPGE and SHG
conductivities maintain a large constant while the CPGE conductivity
disappears. In microwave region, LPGE and SHG start to decrease with increasing
frequency while the CPGE is large. In 125-300 THz region and in y direction,
the presence of DC current without the disturbance of second harmonic current
under circularly polarized light may be useful for fabricating new
optoelectronic devices. Moreover, we illustrate that when calculating the
nonlinear optical responses of practical materials, the theories in the clean
limit fail and it is necessary to use a theory that considers scattering
effects. We also point out that for materials with femtosecond-scale relaxation
times and complex energy band structures, the quantum kinetics is more accurate
than the semi-classical Boltzmann equation method. Besides, phenomenological
expressions of PGE and SHG are provided.
Graphene is a promising material for sensing applications because of its
large specific surface area and low noise. In many applications, graphene will
inevitably be in contact with oxygen since it is the second most abundant gas
in the atmosphere. Therefore, it is of interest to understand how this gas
affects the sensor properties. In this work, the effect of oxygen on the
low-frequency noise of suspended graphene is demonstrated. Devices with
suspended graphene nanoribbons with a width (W) and length (L) of 200 nm were
fabricated. The resistance as a function of time was measured in a vacuum and
pure oxygen atmosphere through an ac lock-in method. After signal processing
with wavelet denoising and analysis, it is demonstrated that oxygen causes
random telegraphy signal (RTS) in the millisecond scale, with an average dwell
time of 2.9 milliseconds in the high-resistance state, and 2 milliseconds in
the low-resistance state. It is also shown that this RTS occurs only at some
periods, which indicates that, upon adsorption, the molecules take some time
until they find the most energetically favorable adsorption state. Also, a
slow-down in the RTS time constants is observed, which infers that less active
sites are available as time goes on because of oxygen adsorption. Therefore, it
is very important to consider these effects to guarantee high sensitivity and
high durability for graphene-based sensors that will be exposed to oxygen
during their lifetime.
We demonstrate that non-diffusive, fluid-like heat transport, such as heat
backflowing from cooler to warmer regions, can be induced, controlled, and
amplified in extreme thermal conductors such as graphite and hexagonal boron
nitride. We employ the viscous heat equations, i.e. the thermal counterpart of
the Navier-Stokes equations in the laminar regime, to show with
first-principles quantitative accuracy that a finite thermal viscosity yields
steady-state heat vortices, and governs the magnitude of transient temperature
waves. Finally, we devise strategies that exploit devices' boundaries and
resonance to amplify and control heat hydrodynamics, paving the way for novel
experiments and applications in next-generation electronic and phononic
technologies.
Topological indices, such as winding numbers, have been conventionally used
to predict the number of topologically protected edge states (TPESs) in
topological insulators, a signature of the topological phenomenon called
bulk-edge correspondence. In this work, we theoretically and experimentally
demonstrate that the number of TPESs at the domain boundary of a
Su-Schrieffer-Heeger (SSH) model can be higher than the winding number
depending on the strengths of beyond-nearest-neighbors, revealing the breakdown
of the winding number prediction. Hence, we resort to the Berry connection to
accurately count the number of TPESs in an SSH system with a domain boundary.
Moreover, the Berry connection can elucidate wavelengths of the TPESs, which is
further confirmed using the Jackiw Rebbi theory. We analytically prove that
each of the multiple TPES modes at the domain boundary corresponds to a bulk
Dirac cone, asserting the robustness of the Berry connection method, which
offers a generalized paradigm for TPES prediction.
Classical spin liquids (CSL) lack long-range magnetic order and are
characterized by an extensive ground state degeneracy. We propose a
classification scheme of CSLs based on the structure of the flat bands of their
Hamiltonians. Depending on absence or presence of the gap from the flat band,
the CSL are classified as algebraic or fragile topological, respectively. Each
category is further classified: the algebraic case by the nature of the
emergent Gauss's law at the gap-closing point(s), and the fragile topological
case by the homotopy of the eigenvector winding around the Brillouin zone.
Previously identified instances of CSLs fit snugly into our scheme, which finds
a landscape where algebraic CSLs are located at transitions between \fragile
topological ones. It also allows us to present a new, simple family of models
illustrating that landscape, which hosts both fragile topological and algebraic
CSLs, as well as transitions between them.
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.
The newly discovered Ruddlesden-Popper bilayer La$_3$Ni$_2$O$_7$ reaches an
remarkable superconducting transition temperature $T_c$ = 80 K under a pressure
of above 14 GPa. Here we propose a minimal bilayer two-orbital model of the
high-pressure phase of La$_3$Ni$_2$O$_7$. Our model is constructed with the
Ni-3d$_{x^2-y^2}$, 3d$_{3z^2-r^2}$ orbitals by using Wannier downfolding of the
density functional theory calculations, which captures the key ingredients of
the material, such as band structure and Fermi surface topology. There are two
electron pockets $\alpha$, $\beta$ and one hole pocket $\gamma$ on the Fermi
surface, in which the $\alpha$, $\beta$ pockets show mixing of two orbitals,
while the $\gamma$ pocket is associated with Ni-d$_{3z^2-r^2}$ orbital. The RPA
spin susceptibility reveals a magnetic enhancement associating to the
d$_{3z^2-r^2}$ state. A higher energy model with O-p orbitals is also provided
for further study.
Non-Hermitian systems with parity-time (PT) symmetry have been realized using
optical constructs in the classical domain, leading to a plethora of
non-intuitive phenomena. However, PT-symmetry in purely quantum non-Hermitian
systems like microcavity exciton-polaritons has not been realized so far. Here
we show how a pair of nearly orthogonal sets of anisotropic exciton-polaritons
can offer a versatile platform for realizing multiple spectral degeneracies
called Exceptional Points (EPs) and propose a roadmap to achieve a PT-symmetric
system. Polarization-tunable coupling strength creates one class of EPs, while
Voigt EPs are observed for specific orientations where splitting of polariton
modes due to birefringence is compensated by Transverse Electric (TE)
-Transverse Magnetic (TM) mode splitting. Thus, paired sets of polarized
anisotropic microcavity exciton-polaritons can offer a promising platform not
only for fundamental research in non-Hermitian quantum physics and topological
polaritons, but also, we propose that it will be critical for realizing zero
threshold lasers.
Consider a d-dimensional quantum field theory (QFT) $\mathfrak{T}$, with a
generalized symmetry $\mathcal{S}$, which may or may not be invertible. We
study the action of $\mathcal{S}$ on generalized or $q$-charges, i.e.
$q$-dimensional operators. The main result of this paper is that $q$-charges
are characterized in terms of the topological defects of the Symmetry
Topological Field Theory (SymTFT) of $\mathcal{S}$, also known as the
``Sandwich Construction''. The SymTFT is a $(d+1)$-dimensional topological
field theory, which encodes the symmetry $\mathcal{S}$ and the physical theory
in terms of its boundary conditions. Our proposal applies quite generally to
any finite symmetry $\mathcal{S}$, including non-invertible, categorical
symmetries. Mathematically, the topological defects of the SymTFT form the
Drinfeld Center of the symmetry category $\mathcal{S}$. Applied to invertible
symmetries, we recover the result of Part I of this series of papers. After
providing general arguments for the identification of $q$-charges with the
topological defects of the SymTFT, we develop this program in detail for QFTs
in 2d (for general fusion category symmetries) and 3d (for fusion 2-category
symmetries).

Date of feed: Thu, 01 Jun 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]+) **Topologically-constrained fluctuations and thermodynamics regulate nonequilibrium response. (arXiv:2305.19348v1 [cond-mat.stat-mech])**

Gabriela Fernandes Martins, Jordan M. Horowitz

**A unified quasiparticle approach to the theory of strongly correlated electron liquids. (arXiv:2305.19385v1 [cond-mat.str-el])**

V. A. Khodel, J. W. Clark, M. V. Zverev

**Bloch Oscillations, Landau-Zener Transition, and Topological Phase Evolution in a Pendula Array. (arXiv:2305.19387v1 [cond-mat.mes-hall])**

Izhar Neder, Chaviva Sirote, Meital Geva, Yoav Lahini, Roni Ilan, Yair Shokef

**Hafnia HfO$_2$ as a Proper Ferroelectric. (arXiv:2305.19446v1 [cond-mat.mtrl-sci])**

Aldo Raeliarijaona, R. E. Cohen

**Atomically smooth films of CsSb: a chemically robust visible light photocathode. (arXiv:2305.19553v1 [physics.acc-ph])**

C. T. Parzyck, C. A. Pennington, W. J. I. DeBenedetti, J. Balajka, E. Echeverria, H. Paik, L. Moreschini, B. D. Faeth, C. Hu, J. K. Nangoi, V. Anil, T. A. Arias, M. A. Hines, D. G. Schlom, A. Galdi, K. M. Shen, J. M. Maxson

**Interaction-induced Liouvillian skin effect in a fermionic chain with two-body loss. (arXiv:2305.19697v1 [cond-mat.str-el])**

Shu Hamanaka, Kazuki Yamamoto, Tsuneya Yoshida

**Sliding and Pinning in Structurally Lubric 2D Material Interfaces. (arXiv:2305.19740v1 [cond-mat.mtrl-sci])**

Jin Wang, Ali Khosravi, Andrea Vanossi, Erio Tosatti

**Axion Topology in Photonic Crystal Domain Walls. (arXiv:2305.19805v1 [physics.optics])**

Chiara Devescovi, Antonio Morales-Pérez, Yoonseok Hwang, Mikel García-Díez, Iñigo Robredo, Juan Luis Mañes, Barry Bradlyn, Aitzol García-Etxarri, Maia G. Vergniory

**Hybrid higher-order skin-topological effect in hyperbolic lattices. (arXiv:2305.19810v1 [cond-mat.mes-hall])**

Junsong Sun, Chang-An Li, Shiping Feng, Huaiming Guo

**Twistronics of Kekul\'e Graphene: Honeycomb and Kagome Flat Bands. (arXiv:2305.19927v1 [cond-mat.mes-hall])**

Michael G. Scheer, Biao Lian

**Dark Matter Detection with Strongly Correlated Topological Materials: Flatband Effect. (arXiv:2305.19967v1 [cond-mat.str-el])**

Zhao Huang, Christopher Lane, Sarah E. Grefe, Snehasish Nandy, Benedikt Fauseweh, Silke Paschen, Qimiao Si, Jian-Xin Zhu

**Zero-bias conductance peaks at zero applied magnetic field due to stray fields from integrated micromagnets in hybrid nanowire quantum dots. (arXiv:2305.19970v1 [cond-mat.mes-hall])**

Y. Jiang, M. Gupta, C. Riggert, M. Pendharkar, C. Dempsey, J.S. Lee, S.D. Harrington, C.J. Palmstrøm, V. S. Pribiag, S.M. Frolov

**Measuring irreversibility from learned representations of biological patterns. (arXiv:2305.19983v1 [cond-mat.stat-mech])**

Junang Li, Chih-Wei Joshua Liu, Michal Szurek, Nikta Fakhri

**AC Josephson effect in a gate-tunable Cd$_3$As$_2$ nanowire superconducting weak link. (arXiv:2305.19996v1 [cond-mat.supr-con])**

Roy Haller, Melissa Osterwalder, Gergő Fülöp, Joost Ridderbos, Minkyung Jung, Christian Schönenberger

**Realization of U(1) Dirac Quantum Spin Liquid in YbZn2GaO5. (arXiv:2305.20040v1 [cond-mat.str-el])**

Sijie Xu, Rabindranath Bag, Nicholas E. Sherman, Lalit Yadav, Alexander I. Kolesnikov, Andrey A. Podlesnyak, Joel E. Moore, Sara Haravifard

**Quantum Monte Carlo study of superconductivity in rhombohedral trilayer graphene under an electric field. (arXiv:2204.06222v2 [cond-mat.str-el] UPDATED)**

Huijia Dai, Runyu Ma, Xiao Zhang, Ting Guo, Tianxing Ma

**Fast quantum transfer mediated by topological domain walls. (arXiv:2208.00797v3 [quant-ph] UPDATED)**

Juan Zurita, Charles E. Creffield, Gloria Platero

**Quantum adiabaticity in many-body systems and almost-orthogonality in complementary subspace. (arXiv:2208.02620v2 [quant-ph] UPDATED)**

Jyong-Hao Chen, Vadim Cheianov

**Thermal transport in nanoelectronic devices cooled by on-chip magnetic refrigeration. (arXiv:2209.07099v2 [cond-mat.mes-hall] UPDATED)**

S. Autti, F. C. Bettsworth, K. Grigoras, D. Gunnarsson, R. P. Haley, A. T. Jones, Yu. A. Pashkin, J. R. Prance, M. Prunnila, M. D. Thompson, D. E. Zmeev

**Photogalvanic effect and second harmonic generation from radio to infrared region in WTe$_2$ monolayer. (arXiv:2302.08103v2 [cond-mat.mes-hall] UPDATED)**

Yuan Liu, Zhen-Gang Zhu, Gang Su

**Anomalous Random Telegraphy Signal in Suspended Graphene with Oxygen Adsorption. (arXiv:2303.01649v2 [cond-mat.mes-hall] UPDATED)**

Alexandro de Moraes Nogueira, Afsal Kareekunnan, Masashi Akabori, Hiroshi Mizuta, Manoharan Muruganathan

**Viscous heat backflow and temperature resonances in extreme thermal conductors. (arXiv:2303.12777v3 [cond-mat.mtrl-sci] UPDATED)**

Jan Dragašević, Michele Simoncelli

**Breakdown of Conventional Winding Number Calculation in One-Dimensional Lattices with Interactions Beyond Nearest Neighbors. (arXiv:2304.04080v2 [cond-mat.mtrl-sci] UPDATED)**

Amir Rajabpoor Alisepahi, Siddhartha Sarkar, Kai Sun, Jihong Ma

**Classification of Classical Spin Liquids: Typology and Resulting Landscape. (arXiv:2305.00155v2 [cond-mat.str-el] UPDATED)**

Han Yan, Owen Benton, Roderich Moessner, Andriy H. Nevidomskyy

**Magnetostriction-driven muon localisation in an antiferromagnetic oxide. (arXiv:2305.12237v2 [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

**Bilayer two-orbital model of La$_3$Ni$_2$O$_7$ under pressure. (arXiv:2305.15564v2 [cond-mat.supr-con] UPDATED)**

Zhihui Luo, Xunwu Hu, Meng Wang, Wéi Wú, Dao-Xin Yao

**Anisotropic exciton polariton pairs as a platform for PT-symmetric non-Hermitian physics. (arXiv:2305.17472v2 [cond-mat.mes-hall] UPDATED)**

Devarshi Chakrabarty, Avijit Dhara, Pritam Das, Kritika Ghosh, Ayan Roy Chaudhuri, Sajal Dhara

**Generalized Charges, Part II: Non-Invertible Symmetries and the Symmetry TFT. (arXiv:2305.17159v1 [hep-th] CROSS LISTED)**

Lakshya Bhardwaj, Sakura Schafer-Nameki

Found 5 papers in prb The control of the valley degree of freedom in Bloch electrons has opened up new avenues for information processing. The synthesis of ferrovalley materials, however, has been limited due to the stringent requirements for breaking both time and space inversion symmetries. To address this challenge, w… The authors study the orbital magnetic field induced Landau quantization of a quantum spin liquid with spinon Fermi surface. In the electronic density of states of the quantum spin liquid, the Landau quantization is found to induce a set of band-edge steps, band-edge resonance peaks, or in-gap bound states when the gauge-field fluctuations are negligible, weak, or strong, respectively. The results indicate that the Landau quantization of the spinon Fermi surface can be detected through scanning tunneling microscope measurements. Layered materials are the most important class of solid lubricants. Friction on their surfaces has complex origins. Most experimental methods so far only give total friction force and cannot separate contributions from different origins. Here, we report a method to separate anisotropic and isotropic… The search for novel topological states of matter remains to be a research focus in the past several decades. While a topology theory based on Bloch bands is thoroughly investigated in systems with finite-range hopping, mostly in the context of condensed matter physics, here we study a generalized o… We calculate the polarization-controlled Rayleigh scattering response of twisted bilayer graphene (tBLG) based on the continuum electronic band model developed by Bistritzer and MacDonald while considering its refinements which address the effects of structural corrugation, doping-dependent Hartree …

Date of feed: Thu, 01 Jun 2023 03:17:09 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]+) **Anomalous valley Hall effect induced by mirror symmetry breaking in transition metal dichalcogenides**

Shilei Ji, Ruijia Yao, Chuye Quan, Jianping Yang, Fabio Caruso, and Xing'ao Li

Author(s): Shilei Ji, Ruijia Yao, Chuye Quan, Jianping Yang, Fabio Caruso, and Xing'ao Li

[Phys. Rev. B 107, 174434] Published Wed May 31, 2023

**Electronic density of states of a $U(1)$ quantum spin liquid with spinon Fermi surface. I. Orbital magnetic field effects**

Wen-Yu He and Patrick A. Lee

Author(s): Wen-Yu He and Patrick A. Lee

[Phys. Rev. B 107, 195155] Published Wed May 31, 2023

**Separating anisotropic and isotropic friction between atomic force microscope tips and atomically flat surfaces**

Mengzhou Liao, Paolo Nicolini, and Tomas Polcar

Author(s): Mengzhou Liao, Paolo Nicolini, and Tomas Polcar

[Phys. Rev. B 107, 195442] Published Wed May 31, 2023

**Non-Bloch topological phases in a Hermitian system**

Kaiye Shi, Mingsheng Tian, Feng-Xiao Sun, and Wei Zhang

Author(s): Kaiye Shi, Mingsheng Tian, Feng-Xiao Sun, and Wei Zhang

[Phys. Rev. B 107, 205154] Published Wed May 31, 2023

**Interference effects in polarization-controlled Rayleigh scattering in twisted bilayer graphene**

Disha Arora, Deepanshu Aggarwal, Sankalpa Ghosh, and Rohit Narula

Author(s): Disha Arora, Deepanshu Aggarwal, Sankalpa Ghosh, and Rohit Narula

[Phys. Rev. B 107, 205423] Published Wed May 31, 2023

Found 5 papers in prl Close to the demixing transition, the degree of freedom associated with relative density fluctuations of a two-component Bose-Einstein condensate is described by a nondissipative Landau-Lifshitz equation. In the quasi-one-dimensional weakly immiscible case, this mapping surprisingly predicts that a … If dark matter interacts too strongly with nuclei, it could be slowed to undetectable speeds in Earth’s crust or atmosphere before reaching a detector. For sub-GeV dark matter, approximations appropriate for heavier dark matter fail, necessitating the use of computationally expensive simulations. We… A new calculation shows that any region of space with the topology of a ball has a standard Bekenstein-Hawking entropy. Top quarks have been recently shown to be a promising system to study quantum information at the highest-energy scale available. The current lines of research mostly discuss topics such as entanglement, Bell nonlocality or quantum tomography. Here, we provide the full picture of quantum correlations… Polar skyrmions are topologically stable, swirling polarization textures with particlelike characteristics, which hold promise for next-generation, nanoscale logic and memory. However, the understanding of how to create ordered polar skyrmion lattice structures and how such structures respond to app…

Date of feed: Thu, 01 Jun 2023 03:17:08 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]+) **Oscillating Solitons and ac Josephson Effect in Ferromagnetic Bose-Bose Mixtures**

S. Bresolin, A. Roy, G. Ferrari, A. Recati, and N. Pavloff

Author(s): S. Bresolin, A. Roy, G. Ferrari, A. Recati, and N. Pavloff

[Phys. Rev. Lett. 130, 220403] Published Wed May 31, 2023

**Analytic Approach to Light Dark Matter Propagation**

Christopher V. Cappiello

Author(s): Christopher V. Cappiello

[Phys. Rev. Lett. 130, 221001] Published Wed May 31, 2023

**Partition Function for a Volume of Space**

Ted Jacobson and Manus R. Visser

Author(s): Ted Jacobson and Manus R. Visser

[Phys. Rev. Lett. 130, 221501] Published Wed May 31, 2023

**Quantum Discord and Steering in Top Quarks at the LHC**

Yoav Afik and Juan Ramón Muñoz de Nova

Author(s): Yoav Afik and Juan Ramón Muñoz de Nova

[Phys. Rev. Lett. 130, 221801] Published Wed May 31, 2023

**Hexagonal Close-Packed Polar-Skyrmion Lattice in Ultrathin Ferroelectric ${\mathrm{PbTiO}}_{3}$ Films**

Shuai Yuan, Zuhuang Chen, Sergei Prokhorenko, Yousra Nahas, Laurent Bellaiche, Chenhan Liu, Bin Xu, Lang Chen, Sujit Das, and Lane W. Martin

Author(s): Shuai Yuan, Zuhuang Chen, Sergei Prokhorenko, Yousra Nahas, Laurent Bellaiche, Chenhan Liu, Bin Xu, Lang Chen, Sujit Das, and Lane W. Martin

[Phys. Rev. Lett. 130, 226801] Published Wed May 31, 2023

Found 1 papers in pr_res Quantum walks underlie an important class of quantum computing algorithms, and represent promising approaches in various simulations and practical applications. Here we design stroboscopically monitored quantum walks and their subsequent graphs that can naturally boost target searches. We show how t…

Date of feed: Thu, 01 Jun 2023 03:17:08 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]+) **Designing exceptional-point-based graphs yielding topologically guaranteed quantum search**

Quancheng Liu, David A. Kessler, and Eli Barkai

Author(s): Quancheng Liu, David A. Kessler, and Eli Barkai

[Phys. Rev. Research 5, 023141] Published Wed May 31, 2023

Found 1 papers in scipost **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]+) **Restoration of the non-Hermitian bulk-boundary correspondence via topological amplification, by Matteo Brunelli, Clara C. Wanjura, Andreas Nunnenkamp**

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Submitted on 2023-05-31, refereeing deadline 2023-07-06.