Found 35 papers in cond-mat A new mechanism for chiral symmetry restoration at extreme high magnetic
fields is proposed in the context of the Magnetic Catalysis scenario in Weyl
Semimetals. Contrary to previous proposals, here we show that, at very large
magnetic fields, the transverse velocity of the axion field, the phase mode of
the chiral condensate $\langle\bar{\psi}\psi\rangle$, becomes effectively
one-dimensional and its fluctuations destroy a possible nonzero value of this
fermionic condensate. We also show that, despite of the $U(1)$ chiral symmetry
is not broken at extremely large magnetic fields, the spectrum of the system is
comprised by a well defined gapless bosonic excitation, connected to the axion
mode, and a correlated insulating fermionic liquid that is neutral to $U(1)$
chiral transformations. We also discuss some consequences of this theory that
can be contrasted to experiments.
Polyurethane and polyurea-based adhesives are widely used in various
applications, from automotive to electronics to medical. The adhesive
performance depends strongly on its composition, and developing the
formulation-structure-property relationship is crucial to making better
products. Here, we investigate the dependence of the linear viscoelastic
properties of polyurea nanocomposites, with IPDI-based polyurea (PUa) matrix
and exfoliated graphene nanoplatelet (xGnP) fillers, on the hard segment weight
fraction (HSWF) and the xGnP loading. We characterize the material using
scanning electron microscopy (SEM) and dynamical mechanical analysis (DMA). It
is found that changing HSWF leads to a significant variation in the stiffness
of the material, from about 10 MPa for the 20% HSWF to about 100 MPa for the
30% HSWF to about 250 MPa for the 40% HSWF polymer (as measured by the tensile
storage modulus at room temperature). The effect of the xGNP loading is
significantly more limited and is generally within experimental error, except
for the 20% HSWF material where the xGNP addition leads to about 80% increase
in stiffness. To correctly interpret the DMA results, we developed a new
physics-based rheological model for the description of the storage and loss
moduli. The model is based on the fractional calculus approach and successfully
describes the material rheology in a broad range of temperatures (-70{\deg}C to
+70{\deg}C) and frequencies (0.1 to 100 s-1), using only six physically
meaningful fitting parameters for each material. The results provide guidance
for the development of nanocomposite PUa-based materials.
Topological spin textures in magnetic materials such as skyrmions and
hopfions are interesting manifestations of geometric structures in real
materials, concurrently having potential applications as information carriers.
In the crystalline systems, the formation of these topological spin textures is
well understood as a result of the competition between interactions due to
symmetry breaking and frustration. However, in systems without translation
symmetry such as amorphous materials, a fundamental understanding of the
driving mechanisms of non-trivial spin structures is lacking owing to the
structural and interaction complexity in these systems. In this work, we use a
suite of first-principles-based calculations to propose an ab initio spin
Hamiltonian that accurately represents the diversity of structural and magnetic
properties in the exemplar amorphous FeGe. Monte Carlo simulations of our
amorphous Hamiltonian find emergent skyrmions that are driven by frustrated
geometric and magnetic exchange, consistent with those observed in experiment.
Moreover, we find that the diversity of local structural motifs results in a
large range of exchange interactions, far beyond those found in crystalline
materials. Finally, we observe the formation of large-scale emergent structures
in amorphous materials, far beyond the relevant interaction length-scale in the
systems, suggesting a new route to emergent correlated phases beyond the
crystalline limit.
Quantum materials whose atoms are arranged on a lattice of corner-sharing
triangles, $\textit{i.e.}$, the kagome lattice, have recently emerged as a
captivating platform for investigating exotic correlated and topological
electronic phenomena. Here, we combine ultra-low temperature angle-resolved
photoemission spectroscopy (ARPES) with scanning tunneling microscopy and
density functional theory calculations to reveal the fascinating electronic
structure of the bilayer-distorted kagome material
$\textit{Ln}$Ti${_3}$Bi${_4}$, where $\textit{Ln}$ stands for Nd and Yb.
Distinct from other kagome materials, $\textit{Ln}$Ti${_3}$Bi${_4}$ exhibits
two-fold, rather than six-fold, symmetries, stemming from the distorted kagome
lattice, which leads to a unique electronic structure. Combining experiment and
theory we map out the electronic structure and discover double flat bands as
well as multiple van Hove singularities (VHSs), with one VHS exhibiting
higher-order characteristics near the Fermi level. Notably, in the magnetic
version NdTi${_3}$Bi${_4}$, the ultra-low base temperature ARPES measurements
unveil an unconventional band splitting in the band dispersions which is
induced by the ferromagnetic ordering. These findings reveal the potential of
bilayer-distorted kagome metals $\textit{Ln}$Ti${_3}$Bi${_4}$ as a promising
platform for exploring novel emergent phases of matter at the intersection of
strong correlation and magnetism.
Neural networks and neuromorphic computing play pivotal roles in deep
learning and machine vision. Due to their dissipative nature and inherent
limitations, traditional semiconductor-based circuits face challenges in
realizing ultra-fast and low-power neural networks. However, the spiking
behavior characteristic of single flux quantum (SFQ) circuits positions them as
promising candidates for spiking neural networks (SNNs). Our previous work
showcased a JJ-Soma design capable of operating at tens of gigahertz while
consuming only a fraction of the power compared to traditional circuits, as
documented in [1]. This paper introduces a compact SFQ-based synapse design
that applies positive and negative weighted inputs to the JJ-Soma. Using an
RSFQ synapse empowers us to replicate the functionality of a biological neuron,
a crucial step in realizing a complete SNN. The JJ-Synapse can operate at
ultra-high frequencies, exhibits orders of magnitude lower power consumption
than CMOS counterparts, and can be conveniently fabricated using commercial Nb
processes. Furthermore, the network's flexibility enables modifications by
incorporating cryo-CMOS circuits for weight value adjustments. In our endeavor,
we have successfully designed, fabricated, and partially tested the JJ-Synapse
within our cryocooler system. Integration with the JJ-Soma further facilitates
the realization of a high-speed inference SNN.
Using scanning-tunneling-microscopy and theoretical modeling on
heterostructures of twisted bilayer graphene and hexagonal Boron-Nitride, we
show that the emergent super-moire structures display a rich landscape of
moire-crystals and quasicrystals. We reveal a phase-diagram comprised of
commensurate moire-crystals embedded in swaths of moire quasicrystals. The 1:1
commensurate crystal, expected to be a Chern insulator, should only exist at
one point on the phase-diagram, implying that it ought to be practically
undetectable. Surprisingly we find that the commensurate crystals exist over a
much wider than predicted range, providing evidence of an unexpected
self-alignment mechanism that is explained using an elastic-network model. The
remainder of the phase-diagram, where we observe tunable quasicrystals, affords
a new platform for exploring the unique electronic-properties of these rarely
found in nature structures.
We investigate some topological and spectral properties of
Erd\H{o}s-R\'{e}nyi (ER) random digraphs $D(n,p)$. In terms of topological
properties, our primary focus lies in analyzing the number of non-isolated
vertices $V_x(D)$ as well as two vertex-degree-based topological indices: the
Randi\'c index $R(D)$ and sum-connectivity index $\chi(D)$. First, by
performing a scaling analysis we show that the average degree $\langle k
\rangle$ serves as scaling parameter for the average values of $V_x(D)$, $R(D)$
and $\chi(D)$. Then, we also state expressions relating the number of arcs,
spectral radius, and closed walks of length 2 to $(n,p)$, the parameters of ER
random digraphs. Concerning spectral properties, we compute six different graph
energies on $D(n,p)$. We start by validating $\langle k \rangle$ as the scaling
parameter of the graph energies. Additionally, we reformulate a set of bounds
previously reported in the literature for these energies as a function $(n,p)$.
Finally, we phenomenologically state relations between energies that allow us
to extend previously known bounds.
We show that the rotating Rayleigh-Benard convection, where a rotating fluid
is heated from below, exhibits non-Hermitian topological states. Recently,
Favier and Knobloch (JFM 2020) hypothesized that the robust wall modes in
rapidly rotating convection are topologically protected. We study the linear
problem around the conduction profile, and by considering a Berry curvature
defined in the complex wavenumber space, particularly, by introducing a complex
vertical wavenumber, we find that these modes can be characterized by a
non-zero integer Chern number, indicating their topological nature. The
eigenvalue problem is intrinsically non-Hermitian, therefore the definition of
Berry curvature generalizes that of the stably stratified problem. Moreover,
the three-dimensional setup naturally regularizes the eigenvector at the
infinite horizontal wavenumber. Under the hydrostatic approximation, it
recovers a two-dimensional analogue of the one which explains the topological
origin of the equatorial Kelvin and Yanai waves. The existence of the tenacious
wall modes relies only on rotation when the fluid is stratified, no matter
whether it is stable or unstable. However, the neutrally stratified system does
not support a topological edge state. In addition, we define a winding number
to visualize the topological nature of the fluid.
The concept of non-Hermiticity has expanded the understanding of band
topology leading to the emergence of counter-intuitive phenomena. One example
is the non-Hermitian skin effect (NHSE), which involves the concentration of
eigenstates at the boundary. However, despite the potential insights that can
be gained from high-dimensional non-Hermitian quantum systems in areas like
curved space, high-order topological phases, and black holes, the realization
of this effect in high dimensions remains unexplored. Here, we create a
two-dimensional (2D) non-Hermitian topological band for ultracold fermions in
spin-orbit-coupled optical lattices with tunable dissipation, and
experimentally examine the spectral topology in the complex eigenenergy plane.
We experimentally demonstrate pronounced nonzero spectral winding numbers when
the dissipation is added to the system, which establishes the existence of 2D
skin effect. We also demonstrate that a pair of exceptional points (EPs) are
created in the momentum space, connected by an open-ended bulk Fermi arc, in
contrast to closed loops found in Hermitian systems. The associated EPs emerge
and shift with increasing dissipation, leading to the formation of the Fermi
arc. Our work sets the stage for further investigation into simulating
non-Hermitian physics in high dimensions and paves the way for understanding
the interplay of quantum statistics with NHSE.
We study the dynamics of topological defects in continuum theories governed
by a free energy minimization principle, building on our recently developed
framework [Romano J, Mahault B and Golestanian R 2023 J. Stat. Mech.: Theory
Exp. 083211]. We show how the equation of motion of point defects, domain
walls, disclination lines and any other singularity can be understood with one
unifying mathematical framework. For disclination lines, this also allows us to
study the interplay between the internal line tension and the interaction with
other lines. This interplay is non-trivial, allowing defect loops to expand,
instead of contracting, due to external interaction. We also use this framework
to obtain an analytical description of two long-lasting problems in point
defect motion, namely the scale dependence of the defect mobility and the role
of elastic anisotropy in the motion of defects in liquid crystals. For the
former, we show that this dependence is strongly problem-dependent, but it can
be computed with high accuracy for a pair of annihilating defects. For the
latter, we show that at the first order in perturbation theory anisotropy
causes a non-radial force, making the trajectory of annihilating defects
deviate from a straight line. At higher orders, it also induces a correction in
the mobility, which becomes non-isotropic for the $+1/2$ defect. We argue that,
due to its generality, our method can help to shed light on the motion of
singularities in many different systems, including driven and active
non-equilibrium theories.
Defects in atomically thin materials can drive new functionalities and expand
applications to multifunctional systems that are monolithically integrated. An
ability to control formation of defects during the synthesis process is an
important capability to create practical deployment opportunities. Molybdenum
disulfide (MoS$_2$), a two-dimensional (2D) semiconducting material harbors
intrinsic defects that can be harnessed to achieve tuneable electronic,
optoelectronic, and electrochemical devices. However, achieving precise control
over defect formation within monolayer MoS$_2$, while maintaining the
structural integrity of the crystals remains a notable challenge. Here, we
present a one-step, in-situ defect engineering approach for monolayer MoS$_2$
using a pressure dependent chemical vapour deposition (CVD) process. Monolayer
MoS$_2$ grown in low-pressure CVD conditions (LP-MoS$_2$) produces sulfur
vacancy (Vs) induced defect rich crystals primarily attributed to the kinetics
of the growth conditions. Conversely, atmospheric pressure CVD grown MoS$_2$
(AP-MoS$_2$) passivates these Vs defects with oxygen. This disparity in defect
profiles profoundly impacts crucial functional properties and device
performance. AP-MoS$_2$ shows a drastically enhanced photoluminescence, which
is significantly quenched in LP-MoS$_2$ attributed to in-gap electron donor
states induced by the Vs defects. However, the n-doping induced by the Vs
defects in LP-MoS$_2$ generates enhanced photoresponsivity and detectivity in
our fabricated photodetectors compared to the AP-MoS$_2$ based devices.
Defect-rich LP-MoS$_2$ outperforms AP-MoS$_2$ as channel layers of field-effect
transistors (FETs), as well as electrocatalytic material for hydrogen evolution
reaction (HER). This work presents a single-step CVD approach for in-situ
defect engineering in monolayer MoS$_2$ and presents a pathway to control
defects in other monolayer material systems.
Topological characteristics in quantum systems typically determine the ground
state, while the corresponding quantum phase transition (QPT) can be identified
through quenching dynamics. Based on the exact results of extended Kitaev
chains, we demonstrate that the system dynamics can be comprehended through the
precession of an ensemble of free-pseudo spins under a magnetic field. The
topology of the driven Hamiltonian is determined by the average winding number
of the non-equilibrium state. Furthermore, we establish that the singularity of
the dynamical quantum phase transition (DQPT) arises from two perpendicular
pseudo-spin vectors associated with the preand post-quenched Hamiltonians.
Moreover, we investigate the distinct behaviors of the dynamic pairing order
parameter in both topological and non-topological regions. These findings offer
valuable insights into the non-equilibrium behavior of topological
superconductors, contributing to the understanding of the resilience of
topological properties in driven quantum systems.
The interplay between a magnetic field and the Coulomb potential from a
charged vacancy on the electron states in graphene is investigated within the
tight-binding model. The Coulomb potential removes locally Landau level
degeneracy, while the vacancy introduces a satellite level next to the normal
Landau level. These satellite levels are found throughout the positive energy
region, but in the negative energy region they turn into atomic collapse
resonances. Crossings between Landau levels with different angular quantum
number $m$ are found. Unlike the point impurity system in which an anticrossing
occurs between Landau levels of the same $m$, in this work anticrossing is
found between the normal Landau level and the vacancy induced level. The atomic
collapse resonance hybridize with the Landau levels. The charge at which the
lowest Landau level $m = -1, N = 1$ crosses increases $E = 0$ with enhancing
magnetic field. Landau level scaling anomaly occurs when the charge is larger
than the critical charge $\beta\approx0.6$ and this critical charge is
independent of the magnetic field.
Dynamic magnetic textures may transfer the angular moment from the varying in
time antiferromagnetic order to spins of conduction electrons. Due to the spin
orbit coupling (SOC) these spin excitations can induce the electric current of
conduction electrons. We calculated the electric current and the electromotive
force (EMF) which are produced by a domain wall (DW) moving parallel to the
magnetically compensated interface between an antiferromagnetic insulator
(AFMI) and a two-dimensional spin orbit coupled metal. Spins of conduction
electrons interact with localized spins of a collinear AFMI through the
interface exchange interaction. The Keldysh formalism of nonequilibrium Green
functions was applied for the analysis of this system. It is shown that a Bloch
DW generates the current perpendicular to the DW motion direction. At the same
time a N\'{e}el DW creates the electric potential which builds up across the
wall. The total charge which is pumped by a Bloch DW can be expressed in terms
of a topologically invariant charge quantum. The latter does not depend on
variations of DW's velocity and shape. These effects increase dramatically when
the Fermi energy approaches the van Hove singularity of the Fermi surface. The
obtained results are important for the electrical detection and control of
dynamic magnetic textures in antiferromagnets.
Paramagnetism or diamagnetism of a material are shown by parallel or
antiparallel directions, respectively, of the induced magnetization under the
influence of external magnetic field. Theoretical study of paramagnetic
susceptibility and diamagnetic susceptibility of non-interacting electrons
system are well described by Pauli's spin susceptibility and Landau-Peierls'
orbital susceptibility, respectively. For interacting electron systems, the
paramagnetic susceptibility has been widely studied by using Hubbard's electron
- electron interaction. However, due to its smaller value, the diamagnetic
susceptibility has not been studied. To investigate the enhancement of an
interacting electrons system, we study a generalized space and time-dependent
orbital susceptibility of conduction electron with a repulsive Hubbard's
electron - electron interaction. By using the retarded Green function
expression of the space and time-dependent orbital susceptibility, we found
that the orbital susceptibility is enhanced when Hubbard's electron - electron
interaction is negative.
Due to its extraordinary properties, suspended graphene is a critical element
in a wide range of applications. Preparation methods that preserve the unique
properties of graphene are therefore in high demand. To date, all protocols for
the production of large graphene films have relied on the application of a
polymer film to stabilize graphene during the transfer process. However, this
inevitably introduces contaminations that have proven to be extremely
difficult, if not impossible, to remove entirely. Here we report the
polymer-free fabrication of suspended films consisting of three graphene layers
spanning circular holes of 150 $\mu$m diameter. We find a high fabrication
yield, very uniform properties of the freestanding graphene across all holes as
well across individual holes. A detailed analysis by confocal Raman and THz
spectroscopy reveals that the triple-layer samples exhibit structural and
electronic properties similar to those of monolayer graphene. We demonstrate
their usability as ion-electron converters in time-of-flight mass spectrometry
and related applications. They are two orders of magnitude thinner than
previous carbon foils typically used in these types of experiments, while still
being robust and exhibiting a sufficiently high electron yield. These results
are an important step towards replacing free-standing ultra-thin carbon films
or graphene from polymer-based transfers with much better defined and clean
graphene.
Topological quantum materials can exhibit unconventional surface states and
anomalous transport properties, but their applications to spintronic devices
are restricted as they require the growth of high-quality thin films with
bulk-like properties. Here, we study 10--30 nm thick epitaxial ferromagnetic
Co$_{\rm 2}$MnGa films with high structural order. Very high values of the
anomalous Hall conductivity, $\sigma_{\rm xy}=1.35\times10^{5}$ $\Omega^{-1}
m^{-1}$, and the anomalous Hall angle, $\theta_{\rm H}=15.8\%$, both comparable
to bulk values. We observe a dramatic crystalline orientation dependence of the
Gilbert damping constant of a factor of two and a giant intrinsic spin Hall
conductivity, $\mathit{\sigma_{\rm SHC}}=(6.08\pm 0.02)\times 10^{5}$
($\hbar/2e$) $\Omega^{-1} m^{-1}$, which is an order of magnitude higher than
literature values of single-layer Ni$_{\rm 80}$Fe$_{\rm 20}$, Ni, Co, Fe, and
multilayer Co$_{\rm 2}$MnGa stacks. Theoretical calculations of the intrinsic
spin Hall conductivity, originating from a strong Berry curvature, corroborate
the results and yield values comparable to the experiment. Our results open up
for the design of spintronic devices based on single layers of topological
quantum materials.
We present a study by Scanning Tunneling Microscopy, supported by ab initio
calculations, of the interaction between graphene and monolayer
(semiconducting) PtSe2 as a function of the twist angle {\theta} between the
two layers. We analyze the PtSe2 contribution to the hybrid interface states
that develop within the bandgap of the semiconductor to probe the interaction.
The experimental data indicate that the interlayer coupling increases markedly
with the value of {\theta}, which is confirmed by ab initio calculations. The
moir\'e patterns observed within the gap are consistent with a momentum
conservation rule between hybridized states, and the strength of the
hybridization can be qualitatively described by a perturbative model.
Two-dimensional electron gases(2DEGs)based on KTaO3 are emerging as a
promising platform for spin-orbitronics due to their high Rashba spin-orbit
coupling (SOC) and gate-voltage tunability. The recent discovery of a
superconducting state in KTaO3 2DEGs now expands their potential towards
topological superconductivity. Although the band structure of KTaO3 surfaces of
various crystallographic orientations has already been mapped using
angle-resolved photoemission spectroscopy(ARPES), this is not the case for
superconducting KTaO3 2DEGs. Here, we reveal the electronic structure of
superconducting 2DEGs based on KTaO3 (111) single crystals through ARPES
measurements. We fit the data with a tight-binding model and compute the
associated spin textures to bring insight into the SOC-driven physics of this
fascinating system.
Achieving robust and electrically controlled valley polarization in monolayer
transition metal dichalcogenides (ML-TMDs) is a frontier challenge for
realistic valleytronic applications. Theoretical investigations show that
integration of 2D materials with ferroelectrics is a promising strategy;
however, its experimental demonstration has remained elusive. Here, we
fabricate ferroelectric field-effect transistors using a ML-WSe2 channel and a
AlScN ferroelectric dielectric, and experimentally demonstrate efficient tuning
as well as non-volatile control of valley polarization. We measured a large
array of transistors and obtained a maximum valley polarization of ~27% at 80 K
with stable retention up to 5400 secs. The enhancement in the valley
polarization was ascribed to the efficient exciton-to-trion (X-T) conversion
and its coupling with an out-of-plane electric field, viz. the quantum-confined
Stark effect. This changes the valley depolarization pathway from strong
exchange interactions to slow spin-flip intervalley scattering. Our research
demonstrates a promising approach for achieving non-volatile control over
valley polarization and suggests new design principles for practical
valleytronic devices.
We characterize perovskite TiF_3, a material which displays significant
negative thermal expansion at elevated temperatures above its
cubic-to-rhombohedral structural phase transition at 330 K. We find the optical
response favors an insulating state in both structural phases, which we show
can be produced in density functional theory calculations only through the
introduction of an on-site Coulomb repulsion. Analysis of the magnetic
susceptibility data gives a S=1/2 local moment per Ti+3 ion and an
antiferromagnetic exchange coupling. Together, these results show that TiF_3 is
a strongly correlated electron system, a fact which constrains possible
mechanisms of strong negative thermal expansion in the Sc_1-xTi_xF3 system. We
consider the relative strength of the Jahn-Teller and electric dipole
interactions in driving the structural transition.
Resistance switching in multilayer structures are typically based on
materials possessing ferroic orders. Here we predict an extremely large
resistance switching based on the relative spin-orbit splitting in twisted
transition metal dichalcogenide (TMD) monolayers tunnel junctions. Because of
the valence band spin splitting which depends on the valley index in the
Brillouin zone, the perpendicular electronic transport through the junction
depends on the relative reciprocal space overlap of the spin-dependent Fermi
surfaces of both layers, which can be tuned by twisting one layer. Our quantum
transport calculations reveal a switching resistance of up to $10^6 \%$ when
the relative alignment of TMDs goes from $0^{\circ}$ to $60^{\circ}$ and when
the angle is kept fixed at $60^{\circ}$ and the Fermi level is varied. By
creating vacancies, we evaluate how inter-valley scattering affects the
efficiency and find that the resistance switching remains large ($10^4 \%$) for
typical values of vacancy concentration. Not only this resistance switching
should be observed at room temperature due to the large spin splitting, but our
results show how twist angle engineering and control of van der Waals
heterostructures could be used for next-generation memory and electronic
applications.
We study topological charge pumping (TCP) in the Rice-Mele (RM) model with
irreciprocal hopping. The non-Hermiticity gives rise to interesting pumping
physics, owing to the presence of skin effect and exceptional points. In the
static 1D RM model, we observe two independent tuning knobs that drive the
topological transition, viz., non-Hermitian parameter $\gamma$ and system size
$N$. To elucidate the system-size dependency, we made use of the finite-size
generalized Brillouin zone (GBZ) scheme. This scheme captures the state pumping
of topological edge modes in the static 1D RM model and provides further
insight into engineering novel gapless exceptional edge modes with the help of
adiabatic drive. Finally, we apply three types of adiabatic protocols to study
TCP in the 1+1D RM model. We further explain the number of pumped charges (in
each period) using a non-Bloch topological invariant. This exactly explains the
presence of different pumping phases in the non-Hermitian RM model as we tune
the non-Hermitian parameter $\gamma$. We observe that in a non-Hermitian
system, even a trivial adiabatic protocol can lead to pumping that has no
Hermitian counterpart.
Rings comprising chemically bonded atoms are essential topological motifs for
the structural ordering of network-forming materials. Quantification of such
larger motifs beyond short-range pair correlation is essential for
understanding the linkages between the orderings and macroscopic behaviors.
Here, we propose two quantitative analysis methods based on rings. The first
method quantifies rings by two geometric indicators: roundness and roughness.
These indicators reveal the linkages between highly symmetric rings and crystal
symmetry in silica and that the structure of amorphous silica mainly consists
of distorted rings. The second method quantifies a spatial correlation function
that describes three-dimensional atomic densities around rings. A comparative
analysis among the functions for different degrees of ring symmetries reveals
that symmetric rings contribute to the local structural order in amorphous
silica. Another analysis of amorphous models with different orderings reveals
anisotropy of the local structural ordering around rings; this contributes to
building the intermediate-range ordering.
We compute the transmission coefficients and zero-temperature conductance for
chiral quasiparticles propagating through various geometries, which consist of
junctions of three-dimensional nodal-point semimetals. In the first scenario,
we consider a potential step with two Rarita-Schwinger-Weyl or two birefringent
semimetals, which are tilted with respect to the other on the two sides of the
junction. The second set-up consists of a junction between a doped Dirac
semimetal and a ferromagnetic Weyl semimetal, where an intrinsic magnetization
present in the latter splits the doubly-degenerate Dirac node into a pair of
Weyl nodes. A scalar potential is also applied in the region where the Weyl
semimetal phase exists. Finally, we study sandwiches of Weyl/multi-Weyl
semimetals, with the middle region being subjected to both scalar and vector
potentials. Our results show that a nonzero transmission spectrum exists where
the areas, enclosed by the Fermi surface projections (in the plane
perpendicular to the propagation axis) of the incidence and transmission
regions, overlap. Such features can help engineer unidirectional carrier
propagation, topologically protected against impurity backscattering, because
of the chiral nature of the charge carriers.
We investigate the orbital Hall effect through a mesoscopic device with
momentum-space orbital texture that is connected to four semi-infinite
terminals embedded in the Landauer-B\"uttiker configuration for quantum
transport. We present analytical and numerical evidence that the orbital Hall
current exhibits mesoscopic fluctuations, which can be interpreted in the
framework of random matrix theory (RMT) (as with spin Hall current
fluctuations). The mesoscopic fluctuations of orbital Hall current display two
different amplitudes of 0.36 and 0.18 for weak and strong spin-orbit coupling,
respectively. The amplitudes are obtained by analytical calculation via RMT and
are supported by numerical calculations based on the tight-binding model.
Furthermore, the orbital Hall current fluctuations lead to two relationships
between the orbital Hall angle and conductivity. Finally, we confront the two
relations with experimental data of the orbital Hall angle, which shows good
concordance between theory and experiment.
Quantum anomalies are the breakdowns of classical conservation laws that
occur in quantum-field theory description of a physical system. They appear in
relativistic field theories of chiral fermions and are expected to lead to
anomalous transport properties in Weyl semimetals. This includes a chiral
anomaly, which is a violation of the chiral current conservation that takes
place when a Weyl semimetal is subjected to parallel electric and magnetic
fields. A charge pumping between Weyl points of opposite chirality causes the
chiral magnetic effect that has been extensively studied with electrical
transport. On the other hand, if the thermal gradient, instead of the
electrical field, is applied along the magnetic field, then as a consequence of
the gravitational (also called the thermal chiral) anomaly an energy pumping
occurs within a pair of Weyl cones. As a result, this is expected to generate
anomalous heat current contributing to the thermal conductivity. We report an
increase of both the magneto-electric and magneto-thermal conductivities in
quasi-classical regime of the magnetic Weyl semimetal NdAlSi. Our work also
shows that the anomalous electric and heat currents, which occur due to the
chiral magnetic effect and gravitational anomalies respectively, are still
linked by a 170 years old relation called the Wiedemann-Franz law.
Three-dimensional topological insulators support gapless Dirac fermion
surface states whose rich topological properties result from the interplay of
symmetries and dimensionality. Their topological properties have been
extensively studied in systems of integer spatial dimension but the prospect of
these surface electrons arranging into structures of non-integer dimension like
fractals remains unexplored. In this work, we investigate a new class of states
arising from the coupling of surface Dirac fermions to a time-reversal
symmetric fractal potential, which breaks translation symmetry while retaining
self-similarity. Employing large-scale exact diagonalization, scaling analysis
of the inverse participation ratio, and the box-counting method, we establish
the onset of self-similar Dirac fermions with fractal dimension for a
symmetry-preserving surface potential with the geometry of a Sierpinski carpet
fractal with fractal dimension $D \approx 1.89$. Dirac fractal surface states
open a fruitful avenue to explore exotic regimes of transport and quantum
information storage in topological systems with fractal dimensionality.
The recently discovered layered kagome superconductors
$\textit{A}$V$_{3}$Sb$_{5}$ ($\textit{A}$ = K, Rb, Cs) have garnered
significant attention, as they exhibit an intriguing combination of
superconductivity, charge density wave (CDW) order, and nontrivial band
topology. As such, these kagome systems serve as an exceptional quantum
platform for investigating the intricate interplay between electron correlation
effects, geometric frustration, and topological electronic structure. A
comprehensive understanding of the underlying electronic structure is crucial
for unveiling the nature and origin of the CDW order, as well as determining
the electron pairing symmetry in the kagome superconductors. In this review, we
present a concise survey of the electronic properties of
$\textit{A}$V$_{3}$Sb$_{5}$, with a particular focus on the insights derived
from angle-resolved photoemission spectroscopy (ARPES). Through the lens of
ARPES, we shed light on the electronic characteristics of the kagome
superconductors $\textit{A}$V$_{3}$Sb$_{5}$, which will pave the way for
exciting new research frontiers in kagome-related physics.
Bulk-boundary correspondence allows one to probe the bulk topological order
by studying the transport properties of the edge modes. However, edge modes in
a fractional quantum Hall (FQH) state can undergo edge reconstruction;
moreover, they can be unequilibrated or exhibit varying degrees of charge and
thermal equilibration, giving rise to a zoo of intriguing scenarios. Even more
possibilities arise when a quantum point contact (QPC) is introduced and tuned
into a conductance plateau. Distinguishing among the different models and
equilibration regimes is an outstanding problem, which cannot be resolved by dc
electrical conductance measurement. In this work we show that \emph{electrical
shot noise} at a QPC conductance plateau can serve as such diagnostic. As a
prototypical example we consider the $\nu=2/3$ FQH state, and show that
different inequalities between the auto- and cross-correlation electrical shot
noise hold for different edge models. In particular, our results offer several
possible scenarios for the QPC conductance plateaus $e^2/3h$ (observed
previously), $e^2/2h$ (recently observed), and $5e^2/9h$ (our prediction), as
well as how to distinguish among them via shot noise.
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.
Their strong coupling provides a unique two-component 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.
Nanoscale quantum dots in microwave cavities can be used as a laboratory for
exploring electron-electron interactions and their spin in the presence of
quantized light and a magnetic field. We show how a simple theoretical model of
this interplay at resonance predicts complex but measurable effects. New
polariton states emerge that combine spin, relative modes, and radiation. These
states have intricate spin-space correlations and undergo polariton transitions
controlled by the microwave cavity field. We uncover novel topological effects
involving highly correlated spin and charge density that display
singlet-triplet and inhomogeneous Bell-state distributions. Signatures of these
transitions are imprinted in the photon distribution, which will allow for
optical read-out protocols in future experiments and nanoscale quantum
technologies.
The topological properties of the Su-Schrieffer-Heeger (SSH) model in the
presence of nearest-neighbor interaction are investigated by means of a
topological marker, generalized from a noninteracting one by utilizing the
single-particle Green's function of the many-body ground state. We find that
despite the marker not being perfectly quantized in the presence of
interactions, it always remains finite in the topologically nontrivial phase
while converging to zero in the trivial phase when approaching the
thermodynamic limit, and hence correctly judges the topological phases in the
presence of interactions. The marker also correctly captures the
interaction-driven, second-order phase transitions between a topological phase
and a Landau-ordered phase, which is a charge density wave order in our model
with a local order parameter, as confirmed by the calculation of entanglement
entropy and the many-body Zak phase. Our work thus points to the possibility of
generalizing topological markers to interacting systems through Green's
function, which may be feasible for topological insulators in any dimension and
symmetry class.
Heat control is a key issue in nano-electronics, where new efficient energy
transfer mechanisms are highly sought after. In this respect, there is indirect
evidence that high-mobility hexagonal boron nitride (hBN)-encapsulated graphene
exhibits hyperbolic out-of-plane radiative energy transfer when driven
out-of-equilibrium. Here we directly observe radiative energy transfer due to
the hyperbolic phonon polaritons modes of the hBN encapsulant in intrinsic
graphene devices under large bias, using mid-infrared spectroscopy and
pyrometry. By using different hBN crystals of varied crystalline quality, we
engineer the energy transfer efficiency, a key asset for compact thermal
management of electronic circuits.
We reveal properties of global modes of linear buoyancy instability in stars,
characterised by the celebrated Schwarzschild criterion, using non-Hermitian
topology. We identify a ring of Exceptional Points of order 4 that originates
from the pseudo-Hermitian and pseudo-chiral symmetries of the system. The ring
results from the merging of a dipole of degeneracy points in the Hermitian
stablystratified counterpart of the problem. Its existence is related to
spherically symmetric unstable modes. We obtain the conditions for which
convection grows over such radial modes. Those are met at early stages of
low-mass stars formation. We finally show that a topological wave is robust to
the presence of convective regions by reporting the presence of a mode
transiting between the wavebands in the non-Hermitian problem, strengthening
their relevance for asteroseismology.

Date of feed: Wed, 15 Nov 2023 01:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Chiral Symmetry Restoration and the Ultraquantum limit of Axionic Charge Density Waves in Weyl Semimetals. (arXiv:2311.07644v1 [cond-mat.str-el])**

Joan Bernabeu, Alberto Cortijo

**Polyurea-Graphene Nanocomposites -- the Influence of Hard-Segment Content and Nanoparticle Loading on Mechanical Properties. (arXiv:2311.07721v1 [cond-mat.mtrl-sci])**

Demetrios A. Tzelepis, Arman Khoshnevis, Mohsen Zayernouri, Valeriy V. Ginzburg

**Ab initio amorphous spin Hamiltonian for the description of topological spin textures in FeGe. (arXiv:2311.07725v1 [cond-mat.mtrl-sci])**

Temuujin Bayaraa, Sinéad M. Griffin

**Magnetic-coupled electronic landscape in bilayer-distorted titanium-based kagome metals. (arXiv:2311.07747v1 [cond-mat.mtrl-sci])**

Yong Hu, Congcong Le, Long Chen, Hanbin Deng, Ying Zhou, Nicholas C. Plumb, Milan Radovic, Ronny Thomale, Andreas P. Schnyder, Jia-Xin Yin, Gang Wang, Xianxin Wu, Ming Shi

**Hybrid Synaptic Structure for Spiking Neural Network Realization. (arXiv:2311.07787v1 [cond-mat.supr-con])**

Sasan Razmkhah, Mustafa Altay Karamuftuoglu, Ali Bozbey

**Imaging Self-aligned Moir\'e Crystals and Quasicrystals in Magic-angle Bilayer Graphene on hBN Heterostructures. (arXiv:2311.07819v1 [cond-mat.mes-hall])**

Xinyuan Lai, Daniele Guerci, Guohong Li, Kenji Watanabe, Takashi Taniguchi, Justin Wilson, Jedediah H. Pixley, Eva Y. Andrei

**Topological and spectral properties of random digraphs. (arXiv:2311.07854v1 [cond-mat.dis-nn])**

C. T. Martínez-Martínez, J. A. Méndez-Bermúdez, José M. Sigarreta

**Non-Hermitian topological wall modes in rotating Rayleigh-Benard convection. (arXiv:2311.07866v1 [physics.flu-dyn])**

Furu Zhang, Jin-Han Xie

**Two-dimensional non-Hermitian skin effect in an ultracold Fermi gas. (arXiv:2311.07931v1 [cond-mat.quant-gas])**

Entong Zhao, Zhiyuan Wang, Chengdong He, Ting Fung Jeffrey Poon, Ka Kwan Pak, Yu-Jun Liu, Peng Ren, Xiong-Jun Liu, Gyu-Boong Jo

**Dynamical theory of topological defects II: Universal aspects of defect motion. (arXiv:2311.07970v1 [cond-mat.soft])**

Jacopo Romano, Benoît Mahault, Ramin Golestanian

**Intrinsic defect engineering of CVD grown monolayer MoS$_2$ for tuneable functional nanodevices. (arXiv:2311.07984v1 [physics.app-ph])**

Irfan H. Abidi, Sindhu Priya Giridhar, Jonathan O. Tollerud, Jake Limb, Aishani Mazumder, Edwin LH Mayes, Billy J. Murdoch, Chenglong Xu, Ankit Bhoriya, Abhishek Ranjan, Taimur Ahmed, Yongxiang Li, Jeffrey A. Davis, Cameron L. Bentley, Salvy P. Russo, Enrico Della Gaspera, Sumeet Walia

**Emerging topological characterization in non-equilibrium states of quenched Kitaev chains. (arXiv:2311.08056v1 [cond-mat.str-el])**

Y. B. Shi, X. Z. Zhang, Z. Song

**Charged vacancy in graphene: interplay between Landau levels and atomic collapse resonances. (arXiv:2311.08064v1 [cond-mat.mes-hall])**

Jing Wang, Wen-Sheng Zhao, Yue Hu, R. N. Costa Filho, Francois M. Peeters

**Generation of electric current and electromotive force by an antiferromagnetic domain wall. (arXiv:2311.08067v1 [cond-mat.mes-hall])**

A. G. Mal'shukov

**Diamagnetic Susceptibility of Interacting Electrons System. (arXiv:2311.08127v1 [cond-mat.str-el])**

Adam B. Cahaya

**Ultra-large polymer-free suspended graphene films. (arXiv:2311.08137v1 [physics.app-ph])**

L. Kalkhoff, S. Matschy, A.S. Meyer, L. Lasnig, N. Junker, M. Mittendorff, L. Breuer, M. Schleberger

**Berry curvature induced giant intrinsic spin-orbit torque in single layer magnetic Weyl semimetal thin films. (arXiv:2311.08145v1 [cond-mat.mes-hall])**

Lakhan Bainsla, Yuya Sakuraba, Keisuke Masuda, Akash Kumar, Ahmad A. Awad, Nilamani Behera, Roman Khymyn, Saroj Prasad Dash, Johan Åkerman

**Angular dependence of the interlayer coupling at the interface between two dimensional materials 1T-PtSe2 and graphene. (arXiv:2311.08165v1 [cond-mat.mes-hall])**

P. Mallet, F. Ibrahim, K. Abdukayumov, A. Marty, C. Vergnaud, F. Bonell, M. Chshiev, M. Jamet, J-Y Veuillen

**Electronic bandstructure of superconducting KTaO3 (111) interfaces. (arXiv:2311.08230v1 [cond-mat.mtrl-sci])**

Srijani Mallik, Börge Göbel, Hugo Witt, Luis M.Vicente-Arche, Sara Varotto, Julien Bréhin, Gerbold Ménard, Guilhem Saïz, Dyhia Tamsaout, Andrés Felipe Santander-Syro, Franck Fortuna, François Bertran, Patrick Le Fèvre, Julien Rault, Isabella Boventer, Ingrid Mertig, Agnès Barthélémy, Nicolas Bergeal, Annika Johansson, Manuel Bibes

**Non-Volatile Control of Valley Polarized Emission in 2D WSe2-AlScN Heterostructures. (arXiv:2311.08275v1 [cond-mat.mes-hall])**

Simrjit Singh, Kwan-Ho Kim, Kiyoung Jo, Pariasadat Musavigharavi, Bumho Kim, Jeffrey Zheng, Nicholas Trainor, Chen Chen, Joan M. Redwing, Eric A Stach, Roy H Olsson III, Deep Jariwala

**Mott insulating negative thermal expansion perovskite TiF3. (arXiv:2311.08382v1 [cond-mat.str-el])**

Donal Sheets, Kaitlin Lyszak, Menka Jain, Gayanath W. Fernando, Ilya Sochnikov, Jacob Franklin, R. Mattias Geilhufe, Jason N. Hancock

**Giant Resistance Switch in Twisted Transition Metal Dichalcogenide Tunnel Junctions. (arXiv:2311.08397v1 [cond-mat.mes-hall])**

Marc Vila

**Anomalous pumping in the non-Hermitian Rice-Mele model. (arXiv:2110.06797v2 [cond-mat.mes-hall] UPDATED)**

Abhishek Kumar, Sarbajit Mazumdar, S D Mahanti, Kush Saha

**Ring-originated anisotropy of local structural ordering in amorphous and crystalline silicon dioxide. (arXiv:2209.12116v2 [cond-mat.mtrl-sci] UPDATED)**

Motoki Shiga, Akihiko Hirata, Yohei Onodera, Hirokazu Masai

**Transmission and conductance across junctions of isotropic and anisotropic three-dimensional semimetals. (arXiv:2302.10078v2 [cond-mat.mes-hall] UPDATED)**

Ipsita Mandal

**Orbital Hall effect in mesoscopic devices. (arXiv:2305.01640v2 [cond-mat.mes-hall] UPDATED)**

Diego B. Fonseca, Lucas L. A. Pereira, Anderson L. R. Barbosa

**Gravitational anomaly in the ferrimagnetic topological Weyl semimetal NdAlSi. (arXiv:2305.04650v2 [cond-mat.mes-hall] UPDATED)**

Pardeep Kumar Tanwar, Mujeeb Ahmad, Md Shahin Alam, Xiaohan Yao, Fazel Tafti, Marcin Matusiak

**Quantum Fractality on the Surface of Topological Insulators. (arXiv:2306.11793v2 [cond-mat.mes-hall] UPDATED)**

Lakshmi Pullasseri, Daniel Shaffer, Luiz H. Santos

**Electronic Landscape of Kagome Superconductors $\textit{A}$V$_{3}$Sb$_{5}$ ($\textit{A}$ = K, Rb, Cs) from Angle-Resolved Photoemission Spectroscopy. (arXiv:2306.16343v2 [cond-mat.supr-con] UPDATED)**

Yong Hu, Xianxin Wu, Andreas P. Schnyder, Ming Shi

**Shot Noise as a Diagnostic in the Fractional Quantum Hall Edge Zoo. (arXiv:2307.05173v2 [cond-mat.mes-hall] UPDATED)**

Sourav Manna, Ankur Das, Moshe Goldstein

**Inter-layer valence bonds and two-component theory for high-$T_c$ superconductivity of La$_{3}$Ni$_{2}$O$_{7}$ under pressure. (arXiv:2308.01176v2 [cond-mat.supr-con] UPDATED)**

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

**Cavity-induced switching between Bell-state textures in a quantum dot. (arXiv:2308.08722v2 [cond-mat.mes-hall] UPDATED)**

S. S. Beltrán-Romero, F. J. Rodríguez, L. Quiroga, N. F. Johnson

**Topological marker approach to an interacting Su-Schrieffer-Heeger model. (arXiv:2308.14534v2 [cond-mat.str-el] UPDATED)**

Pedro B. Melo, Sebastião A. S. Júnior, Wei Chen, Rubem Mondaini, Thereza Paiva

**Direct observation and control of near-field radiative energy transfer in a natural hyperbolic material. (arXiv:2310.08351v3 [cond-mat.mes-hall] UPDATED)**

L. Abou-Hamdan, A. Schmitt, R. Bretel, S. Rossetti, M. Tharrault, D. Mele, A. Pierret, M. Rosticher, T. Taniguchi, K. Watanabe, C. Maestre, C. Journet, B. Toury, V. Garnier, P. Steyer, J. H. Edgar, E. Janzen, J-M. Berroir, G. Fève, G. Ménard, B. Plaçais, C. Voisin, J-P. Hugonin, E. Bailly, B. Vest, J-J. Greffet, P. Bouchon, Y. De Wilde, E. Baudin

**The Exceptional Ring of buoyancy instability in stars. (arXiv:2311.05944v1 [astro-ph.SR] CROSS LISTED)**

Armand Leclerc, Lucien Jezequel, Nicolas Perez, Asmita Bhandare, Guillaume Laibe, Pierre Delplace

Found 6 papers in prb Chiral superconductors spontaneously break time-reversal symmetry and host topologically protected edge modes, supposedly generating chiral edge currents which are typically taken as a characteristic fingerprint of chiral superconductivity. However, recent studies have shown that the total edge curr… Pair density waves (PDWs) are superconducting states formed by Cooper pairs of electrons containing a nonzero center-of-mass momentum. They are characterized by a spatially modulated order parameter and may occur in a variety of emerging quantum materials such as cuprates, transition-metal dichalcog… We study the Andreev and normal reflection processes—retro as well as specular—in a bilayer graphene–superconductor junction where equal and opposite displacement fields are applied for the top and bottom layers to induce a band gap. By employing the Dirac-Bogoliubov–de Gennes equation for the gappe… A neural network is a powerful tool that can uncover hidden laws beyond human intuition. However, it often appears as a black box due to its complicated nonlinear structures. By drawing upon the Gutzwiller mean-field theory, we can showcase a principle of sign rules for ordered states in qubit latti… Three-dimensional higher-order topological semimetals in crystalline systems exhibit higher-order Fermi arcs on one-dimensional hinges, challenging the conventional bulk-boundary correspondence. However, the existence of higher-order Fermi arc states in aperiodic quasicrystalline systems remains unc… The existence of a curved graphene sheet with the geometry of a Bour surface ${B}_{n}$ is supposed, such as the catenoid (or helicoid), ${B}_{0}$, and the classical Enneper surface, ${B}_{2}$, among others. In particular, in this paper, the propagation of the electronic degrees of freedom on these s…

Date of feed: Wed, 15 Nov 2023 04:17:24 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Enhanced chiral edge currents and orbital magnetic moment in chiral $d$-wave superconductors from mesoscopic finite-size effects**

P. Holmvall and A. M. Black-Schaffer

Author(s): P. Holmvall and A. M. Black-Schaffer

[Phys. Rev. B 108, 174505] Published Tue Nov 14, 2023

**Exact solution for finite center-of-mass momentum Cooper pairing**

Chandan Setty, Jinchao Zhao, Laura Fanfarillo, Edwin W. Huang, Peter J. Hirschfeld, Philip W. Phillips, and Kun Yang

Author(s): Chandan Setty, Jinchao Zhao, Laura Fanfarillo, Edwin W. Huang, Peter J. Hirschfeld, Philip W. Phillips, and Kun Yang

[Phys. Rev. B 108, 174506] Published Tue Nov 14, 2023

**Andreev and normal reflections in gapped bilayer graphene–superconductor junctions**

Panch Ram, Detlef Beckmann, Romain Danneau, and Wolfgang Belzig

Author(s): Panch Ram, Detlef Beckmann, Romain Danneau, and Wolfgang Belzig

[Phys. Rev. B 108, 184510] Published Tue Nov 14, 2023

**Principle of learning sign rules by neural networks in qubit lattice models**

Jin Cao, Shijie Hu, Zhiping Yin, and Ke Xia

Author(s): Jin Cao, Shijie Hu, Zhiping Yin, and Ke Xia

[Phys. Rev. B 108, 195127] Published Tue Nov 14, 2023

**Quasicrystalline second-order topological semimetals**

Rui Chen, Bin Zhou, and Dong-Hui Xu

Author(s): Rui Chen, Bin Zhou, and Dong-Hui Xu

[Phys. Rev. B 108, 195306] Published Tue Nov 14, 2023

**Klein tunneling on Bour surfaces with $N$ topological defects**

Víctor A. González-Domínguez, Juan A. Reyes-Nava, and Pavel Castro-Villarreal

Author(s): Víctor A. González-Domínguez, Juan A. Reyes-Nava, and Pavel Castro-Villarreal

[Phys. Rev. B 108, 195421] Published Tue Nov 14, 2023

Found 1 papers in prl We show through nonequilibrium nonadiabatic electron-spin-lattice simulations that above a critical current in magnetic atomic wires with a narrow domain wall (DW), a couple of atomic spaces in width, the electron flow triggers violent stimulated emission of phonons and magnons with an almost comple…

Date of feed: Wed, 15 Nov 2023 04:17:26 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Phonon and Magnon Jets above the Critical Current in Nanowires with Planar Domain Walls**

Maria Stamenova, Plamen Stamenov, and Tchavdar Todorov

Author(s): Maria Stamenova, Plamen Stamenov, and Tchavdar Todorov

[Phys. Rev. Lett. 131, 206302] Published Tue Nov 14, 2023

Found 1 papers in pr_res The optical properties of metallic nanoparticles are most often considered in terms of plasmons, the coupled states of light and quasifree electrons. Confinement of electrons inside the nanostructure leads to another, very different type of resonances. We demonstrate that these confinement-induced r…

Date of feed: Wed, 15 Nov 2023 04:17:25 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Metallic nanostructures as electronic billiards for nonlinear terahertz photonics**

Ihar Babushkin, Liping Shi (石理平), Ayhan Demircan, Uwe Morgner, Joachim Herrmann, and Anton Husakou

Author(s): Ihar Babushkin, Liping Shi (石理平), Ayhan Demircan, Uwe Morgner, Joachim Herrmann, and Anton Husakou

[Phys. Rev. Research 5, 043151] Published Tue Nov 14, 2023

Found 14 papers in nano-lett

Date of feed: Tue, 14 Nov 2023 14:16:46 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] Magnetotransport Signatures of Superconducting Cooper Pairs Carried by Topological Surface States in Bismuth Selenide**

Raj Kumar, Cristian V. Ciobanu, Somilkumar J. Rathi, Joseph E. Brom, Joan M. Redwing, and Frank HunteNano LettersDOI: 10.1021/acs.nanolett.3c02795

**[ASAP] Giant and Controllable Valley Currents in Graphene by Double Pumped THz Light**

Sangeeta Sharma, Deepika Gill, and Samuel ShallcrossNano LettersDOI: 10.1021/acs.nanolett.3c02874

**[ASAP] Modulating the Electrochemical Intercalation of Graphene Interfaces with α-RuCl3 as a Solid-State Electron Acceptor**

Jonathon Nessralla, Daniel T. Larson, Takashi Taniguchi, Kenji Watanabe, Efthimios Kaxiras, and D. Kwabena BediakoNano LettersDOI: 10.1021/acs.nanolett.3c02877

**[ASAP] Gate-Tuning Hybrid Polaritons in Twisted α-MoO3/Graphene Heterostructures**

Zhou Zhou, Renkang Song, Junbo Xu, Xiang Ni, Zijia Dang, Zhichen Zhao, Jiamin Quan, Siyu Dong, Weida Hu, Di Huang, Ke Chen, Zhanshan Wang, Xinbin Cheng, Markus B. Raschke, Andrea Alù, and Tao JiangNano LettersDOI: 10.1021/acs.nanolett.3c03769

**[ASAP] Nanoparticle Deep-Subwavelength Dynamics Empowered by Optical Meron–Antimeron Topology**

Chengfeng Lu, Bo Wang, Xiang Fang, Din Ping Tsai, Weiming Zhu, Qinghua Song, Xiao Deng, Tao He, Xiaoyun Gong, Hong Luo, Zhanshan Wang, Xinhua Dai, Yuzhi Shi, and Xinbin ChengNano LettersDOI: 10.1021/acs.nanolett.3c03351

**[ASAP] Graphene Oxide-Mediated Regulation of Volume Exclusion and Wettability in Biomimetic Phosphorylation-Responsive Ionic Gates**

Liu Shi, Beibei Nie, Lingjun Sha, Keqin Ying, Jinlong Li, and Genxi LiNano LettersDOI: 10.1021/acs.nanolett.3c02924

**[ASAP] PZT-Enabled MoS2 Floating Gate Transistors: Overcoming Boltzmann Tyranny and Achieving Ultralow Energy Consumption for High-Accuracy Neuromorphic Computing**

Jing Chen, Ye-Qing Zhu, Xue-Chun Zhao, Zheng-Hua Wang, Kai Zhang, Zheng Zhang, Ming-Yuan Sun, Shuai Wang, Yu Zhang, Lin Han, Xiaoming Wu, and Tian-Ling RenNano LettersDOI: 10.1021/acs.nanolett.3c02721

**[ASAP] Topological Transitions and Surface Umklapp Scattering in Weakly Modulated Periodic Metasurfaces**

Kobi Cohen, Shai Tsesses, Shimon Dolev, Yael Blechman, Guy Ankonina, and Guy BartalNano LettersDOI: 10.1021/acs.nanolett.3c02759

**[ASAP] High-Performance WSe2 Top-Gate Devices with Strong Spacer Doping**

Po-Hsun Ho, Yu-Ying Yang, Sui-An Chou, Ren-Hao Cheng, Po-Heng Pao, Chao-Ching Cheng, Iuliana Radu, and Chao-Hsin ChienNano LettersDOI: 10.1021/acs.nanolett.3c02757

**[ASAP] Robustness of Trion State in Gated Monolayer MoSe2 under Pressure**

Zeya Li, Feng Qin, Chin Shen Ong, Junwei Huang, Zian Xu, Peng Chen, Caiyu Qiu, Xi Zhang, Caorong Zhang, Xiuxiu Zhang, Olle Eriksson, Angel Rubio, Peizhe Tang, and Hongtao YuanNano LettersDOI: 10.1021/acs.nanolett.3c02812

**[ASAP] Unveiling Local Optical Properties Using Nanoimaging Phase Mapping in High-Index Topological Insulator Bi2Se3 Resonant Nanostructures**

Sukanta Nandi, Shany Z. Cohen, Danveer Singh, Michal Poplinger, Pilkhaz Nanikashvili, Doron Naveh, and Tomer LewiNano LettersDOI: 10.1021/acs.nanolett.3c03128

**[ASAP] Electric Potential at the Interface of Membraneless Organelles Gauged by Graphene**

Christian Hoffmann, Gennadiy Murastov, Johannes Vincent Tromm, Jean-Baptiste Moog, Muhammad Awais Aslam, Aleksandar Matkovic, and Dragomir MilovanovicNano LettersDOI: 10.1021/acs.nanolett.3c02915

**[ASAP] Semiconducting Transition Metal Dichalcogenide Heteronanotubes with Controlled Outer-Wall Structures**

Yohei Yomogida, Mai Nagano, Zheng Liu, Kan Ueji, Md. Ashiqur Rahman, Abdul Ahad, Akane Ihara, Hiroyuki Nishidome, Takashi Yagi, Yusuke Nakanishi, Yasumitsu Miyata, and Kazuhiro YanagiNano LettersDOI: 10.1021/acs.nanolett.3c01761

**[ASAP] Submillimeter-Long WS2 Nanotubes: The Pathway to Inorganic Buckypaper**

Vojtěch Kundrát, Rita Rosentsveig, Kristýna Bukvišová, Daniel Citterberg, Miroslav Kolíbal, Shachar Keren, Iddo Pinkas, Omer Yaffe, Alla Zak, and Reshef TenneNano LettersDOI: 10.1021/acs.nanolett.3c02783

Found 3 papers in acs-nano

Date of feed: Tue, 14 Nov 2023 14:12:16 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] Analysis of Strain and Defects in Tellurium-WSe2 Moiré Heterostructures Using Scanning Nanodiffraction**

Bengisu Sari, Steven E. Zeltmann, Chunsong Zhao, Philipp M. Pelz, Ali Javey, Andrew M. Minor, Colin Ophus, and Mary C. ScottACS NanoDOI: 10.1021/acsnano.3c04283

**[ASAP] Strain-Induced 2H to 1T′ Phase Transition in Suspended MoTe2 Using Electric Double Layer Gating**

Shubham Sukumar Awate, Ke Xu, Jierui Liang, Benjamin Katz, Ryan Muzzio, Vincent H. Crespi, Jyoti Katoch, and Susan K. Fullerton-ShireyACS NanoDOI: 10.1021/acsnano.3c04701

**[ASAP] Graphene-In2Se3 van der Waals Heterojunction Neuristor for Optical In-Memory Bimodal Operation**

Subhrajit Mukherjee, Debopriya Dutta, Anurag Ghosh, and Elad KorenACS NanoDOI: 10.1021/acsnano.3c03820

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

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