Found 42 papers in cond-mat Modern three-dimensional nanofabrication methods make it possible to generate
arbitrarily shaped nanomagnets, including periodic networks of interconnected
magnetic nanowires. Structurally similar to optical or acoustic metamaterials,
these arrays could represent magnetic variants of such artificial materials.
Using micromagnetic simulations, we investigate a three-dimensional array of
interconnected magnetic nanowires with intersection points corresponding to
atomic positions of a diamond lattice. The high-frequency excitation spectrum
of this artificial magnetic crystal (AMC) is governed by its microstructure
and, to a lesser extent, by the magnetic configuration. The magnetic system
displays characteristics of three-dimensional artificial spin ice. It can
contain Dirac-type magnetic defect structures, which modify the magnonic
spectrum of the AMC similarly as defect sites in a natural diamond crystal
influence optical absorption spectra. Our study opens new perspectives for
applying such materials in high-density magnonic devices and shows that AMCs
represent a promising category of magnonic materials with tunable properties.
A band with a nonzero Chern number cannot be fully localized by weak
disorder. There must remain at least one extended state, which ``carries the
Chern number.'' Here we show that a trivial band can behave in a similar way.
Instead of fully localizing, arbitrarily weak disorder leads to the emergence
of two sets of extended states, positioned at two different energy intervals,
which carry opposite Chern numbers. Thus, a single trivial band can show the
same behavior as two separate Chern bands. We show that this property is
predicted by a topological invariant called a ``localizer index.'' Even though
the band as a whole is trivial as far as the Chern number is concerned, the
localizer index allows access to a topological fine structure. This index
changes as a function of energy within the bandwidth of the trivial band,
causing nontrivial extended states to appear as soon as disorder is introduced.
Our work points to a previously overlooked manifestation of topology, which
impacts the response of systems to impurities beyond the information included
in conventional topological invariants.
Majorana zero modes have gained significant interest due to their potential
applications in topological quantum computing and in the realization of exotic
quantum phases. These zero-energy quasiparticle excitations localize at the
vortex cores of two-dimensional topological superconductors or at the ends of
one-dimensional topological superconductors. Here we describe an alternative
platform: a two-dimensional topological superconductor with inhomogeneous
superconductivity, where Majorana modes localize at the ends of topologically
nontrivial one-dimensional stripes induced by the spatial variations of the
order parameter phase. In certain regimes, these Majorana modes hybridize into
a single highly nonlocal state delocalized over spatially separated points,
with exactly zero energy at finite system sizes and with emergent
quantum-mechanical supersymmetry. We then present detailed descriptions of
braiding and fusion protocols and showcase the versatility of our proposal by
suggesting possible setups which can potentially lead to the realization
Yang-Lee anyons and the Sachdev-Ye-Kitaev model.
We review the physics of monolayer graphene in a strong magnetic field, with
emphasis on highly collective states that emerge from the weakly interacting
system because of correlations (emergent states). After reviewing the general
properties of graphene and of electrons in a magnetic field, we give a brief
introduction to the integer quantum Hall effect (IQHE) and the fractional
quantum Hall effect (FQHE) in a 2D electron gas as foundation to show that
monolayer graphene in a magnetic field exhibits both effects, but with
properties modified by the influence of the graphene crystal. After giving an
introduction to standard methods of dealing with emergent states for this
system, we show that an SO(8) fermion dynamical symmetry governs the emergent
degrees of freedom and that the algebraic and group properties of the dynamical
symmetry provide a new view of strongly correlated states observed in monolayer
graphene subject to a strong magnetic field.
Topological phases stabilized by crystalline point group symmetry protection
are a large class of symmetry-protected topological phases subjected to
considerable experimental scrutiny. Here, we show that the canonical
three-dimensional (3D) crystalline topological insulator protected by
time-reversal symmetry $\mathcal{T}$ and four-fold rotation symmetry
$\mathcal{C}_4$ individually or the product symmetry $\mathcal{C}_4
\mathcal{T}$, generically realizes finite-size crystalline topological phases
in thin film geometry (a quasi-(3-1)-dimensional, or q(3-1)D, geometry):
response signatures of the 3D bulk topology co-exist with
topologically-protected, quasi-(3-2)D and quasi-(3-3)D boundary modes within
the energy gap resulting from strong hybridisation of the Dirac cone surface
states of the underlying 3D crystalline topological phase. Importantly, we find
qualitative distinctions between these gapless boundary modes and those of
strictly 2D crystalline topological states with the same symmetry-protection,
and develop a low-energy, analytical theory of the finite-size topological
magnetoelectric response.
Entanglement entropy is a fundamental concept with rising importance in
different fields ranging from quantum information science, black holes to
materials science. In complex materials and systems, entanglement entropy
provides insight into the collective degrees of freedom that underlie the
systems' complex behaviours. As well-known predictions, the entanglement
entropy exhibits area laws for systems with gapped excitations, whereas it
follows the Gioev-Klich-Widom scaling law in gapless fermion systems.
Furthermore, the entanglement spectrum provides salient characterizations of
topological phases and phase transitions beyond the conventional paradigms.
However, many of these fundamental predictions have not yet been confirmed in
experiments due to the difficulties in measuring entanglement entropy in
physical systems. Here, we report the experimental verification of the above
predictions by probing the nonlocal correlations in phononic systems. From the
pump-probe responses in phononic crystals, we obtain the entanglement entropy
and entanglement spectrum for phononic systems with the fermion filling analog.
With these measurements, we verify the Gioev-Klich-Widom scaling law of
entanglement entropy for various quasiparticle dispersions in one- and
two-dimensions. Moreover, we observe the salient signatures of topological
phases in the entanglement spectrum and entanglement entropy which unveil an
unprecedented probe of topological phases without relying on the bulk-boundary
correspondence. The progress here opens a frontier where entanglement entropy
serves as an important experimental tool in the study of emergent phases and
phase transitions which can be generalized to non-Hermitian and other
unconventional regimes.
Recent reports on machine learning (ML) and machine vision (MV) devices have
demonstrated the potentials of 2D materials and devices. Yet, scalable 2D
devices are being challenged by contact resistance and Fermi Level Pinning
(FLP), power consumption, and low-cost CMOS compatible lithography processes.
To enable CMOS+2D, it is essential to find a proper lithography strategy that
can fulfill these requirements. Here, we explore modified van der Waals (vdW)
deposition lithography and demonstrate a relatively new class of
van-der-Waals-Field-Effect-Transistors (vdW-FETs) based on 2D materials. This
lithography strategy enables us to unlock high performance devices evident by
high current on-off ratio (Ion/Ioff), high turn-on current density (Ion), and
weak Fermi Level Pinning (FLP). We utilize this approach to demonstrate a
gate-tunable near-ideal diode using MoS2/WSe2 heterojunction with an ideality
factor of ~1.65 and current rectification of 102. We finally demonstrate a
highly sensitive, scalable, and ultra-low power phototransistor using MoS2/
WSe2 vdW-FET for Back-End-of-Line (BEOL) integration. Our phototransistor
exhibits the highest gate-tunable photoresponsivity achieved to date for white
light detection with ultra-low power dissipation, enabling ultra-sensitive,
ultra-fast, and efficient optoelectronic applications such as in-sensor
neuromorphic machine vision. Our approach shows the great potential of modified
vdW deposition lithography for back-end-of-line CMOS+2D applications.
We theoretically study first and second-order optical responses in a
transition metal dichalcogenide monolayer with distinct trivial, nodal, and
time-reversal invariant topological superconducting (TRITOPS) phases. We show
that the second-order DC response, also known as the photogalvanic response,
contains signatures for differentiating these phases while the first-order
optical response does not. We find that the high-frequency photogalvanic
response is insensitive to the phase of the system, while the low-frequency
response exhibits features distinguishing the three phases. At zero doping,
corresponding to an electron filling in which the Fermi level lies at nodal
points, there are opposite sign zero-frequency divergences in the response when
approaching the nodal phase boundaries from the trivial and the TRITOPS phases.
In the trivial phase, both the high-frequency and low-frequency response of the
system are negative, but in the TRITOPS phase, the low-frequency response
becomes positive while the high-frequency response remains negative.
Furthermore, since phase transitions are controlled by the Rashba spin-orbit
coupling and the ratio of intra-orbital and inter-orbital paring amplitudes,
our results not only help distinguish the phases but can also provide an
estimate of the pairing amplitudes based on the photogalvanic response of the
system.
Wurtzite ferroelectrics hold transformative potential for next-generation
microelectronics. However, fundamental atomic-level understanding of their
intrinsic switching mechanisms and domain energetics remains elusive. By
combining scanning transmission electron microscopy and density functional
theory, we reveal sub-nanometer electric-field-induced domain walls in a
representative wurtzite ferroelectric, ScGaN. We observe vertical domain walls
with side-by-side antiparallel polarization and, significantly, a new type of
horizontal domain wall featuring a novel "2H MoS2-like" configuration. Such
configuration substantiates a buckled hexagonal phase with large polarization
discontinuity and rich dangling bonds, offering a new framework for domain wall
electronics. Our findings mark a pivotal step in understanding ferroelectric
domain switching in this emerging material class and lay the groundwork for
fundamental physics studies and innovative device applications based on
wurtzite ferroelectrics.
To meet the demands for more adaptable and expedient approaches to augment
both research and manufacturing, we report an autonomous system using real-time
in-situ characterization and an autonomous, decision-making processer based on
an active learning algorithm. This system was applied to a plastic film forming
system to highlight its efficiency and accuracy in determining the process
conditions for specified target film dimensions, importantly, without any human
intervention. Application of this system towards nine distinct film dimensions
demonstrated the system ability to quickly determine the appropriate and stable
process conditions (average 11 characterization-adjustment iterations, 19
minutes) and the ability to avoid traps, such as repetitive over-correction.
Furthermore, comparison of the achieved film dimensions to the target values
showed a high accuracy (R2 = 0.87, 0.90) for film width and thickness,
respectively. In addition, the use of an active learning algorithm afforded our
system to proceed optimization with zero initial training data, which was
unavailable due to the complex relationships between the control factors
(material supply rate, applied force, material viscosity) within the plastic
forming process. As our system is intrinsically general and can be applied to
any most material processes, these results have significant implications in
accelerating both research and industrial processes.
The present work puts forward a concept that the thermostable O1s XPS peaks
with energy of about 531 eV in negative charge-transfer SrFeO_{3-\delta}
perovskite are determined by the peroxo-like oxygen species. The peroxo group
forms via coupling two oxygen anions coordinated to iron cations with
d^5\bar-under{L} (\bar-under{L}-oxygen electron hole) configuration. By means
of plane-wave DFT+U approach there have been shown that the peroxo group
represents a metastable state in the absence of oxygen vacancies nearby. The
O-O bonding confines two electron holes freezing the 3+ oxidation state for two
iron cations bridged by peroxide. Increasing the peroxo group numbers makes the
ferrite a semiconductor with charge-transfer gap of about 0.6 eV.
Magnetic topological insulator is a fertile platform to study the interplay
between magnetism and topology. The unique electronic band structure can induce
exotic transport and optical properties. However, a comprehensive optical study
in both near-infrared frequency and terahertz frequency has been lacking. Here,
we report magneto-optical effects from a heterostructure of Cr-incorporated
topological insulator, CBST. We use 800 nm magneto-optical Kerr effect to
reveal a ferromagnetic order in the CBST film with a high transition
temperature at 160 K. We also use time-domain terahertz polarimetry to reveal a
terahertz Faraday rotation of 1.5 mrad and Kerr rotation of 5.1 mrad at 2 K.
The calculated terahertz Hall conductance is 0.42 $e^2/h$. Our work shows the
optical responses of an artificially layered magnetic topological insulator,
paving the way towards high-temperature quantum anomalous Hall effect via
heterostructure engineering.
Measuring the magnetoconductivity induced from impurities may help determine
the impurity distribution and reveal the structure of a Weyl semimetal sample.
To verify this, we utilized the Gaussian random disorder to simulate charged
impurities in a two-node Weyl semimetal model and investigate the impact of
charged impurities on magnetoconductivity in Weyl semimetals. We first compute
the longitudinal magnetic conductivity and find that it is positive and
increases proportionally with the parameter governing the Gaussian distribution
of charged impurities, suggesting the presence of negative longitudinal
magnetoresistivity (NLMR). Then we consider both the intravalley and
inter-valley scattering processes to calculate the induced transverse
magnetoconductivity in the model. Our findings indicate that both inter-valley
and intra-valley scattering processes play important roles in calculating the
transverse magnetoconductivity. The locations of Weyl nodes can also be
determined by magnetoconductivity measurements. This is possible if the
magnetic field strength and the density of charged impurities are known.
Alternatively, the measurement of magnetic conductivity may reveal the
distribution of charged impurites in a given sample once the locations of the
Weyl nodes have been determined. These findings can aid in detecting the
structure of a Weyl semimetal sample, enhancing comprehension of
magnetotransport in Weyl semimetals, and promoting the development of valley
electronics.
We study phase transitions driven by structural disorder in noncrystalline
topological insulators. We introduce a procedural generation algorithm, the
Perlin noise, typically used in computer graphics, to incorporate disorder to a
two-dimensional lattice, allowing a continuous interpolation between a pristine
and a random gas system, going through all different intermediate structural
regimes, such as the paracrystalline and the amorphous phases. We define a
two-band model, including intraorbital and interorbital mixings, on the
structures generated by the algorithm and we find a sequence of
structure-driven topological phase transitions characterized by changes in the
topological Bott index, at which the insulating gap dynamically closes while
evolving from the Bragg planes of the Brillouin zone towards the center. We
interpret our results within the framework of Hosemann's paracrystal theory, in
which distortion is included in the lattice structure factor and renormalizes
the band-splitting parameter. Based on these results, we ultimately demonstrate
the phenomenon of topological protection at its extreme.
Scanning tunnelling microscopy (STM) with a functionalized tip apex reveals
the geometric and electronic structure of a sample within the same experiment.
However, the complex nature of the signal makes images difficult to interpret
and has so far limited most research to planar samples with a known chemical
composition. Here, we present automated structure discovery for STM (ASD-STM),
a machine learning tool for predicting the atomic structure directly from an
STM image, by building upon successful methods for structure discovery in
non-contact atomic force microscopy (nc-AFM). We apply the method on various
organic molecules and achieve good accuracy on structure predictions and
chemical identification on a qualitative level, while highlighting future
development requirements to ASD-STM. This method is directly applicable to
experimental STM images of organic molecules, making structure discovery
available for a wider SPM audience outside of nc-AFM. This work also opens
doors for more advanced machine learning methods to be developed for STM
discovery.
Creating heterostructures with graphene/graphite is a practical method for
charge-doping $\alpha$-RuCl$_3$, but not sufficient to cause the
insulator-to-metal transition. In this study, detailed scanning tunneling
microscopy/spectroscopy measurements on $\alpha$-RuCl$_3$ with various lattice
deformations reveal that both in-plane and out-of-plane lattice distortions may
collapse the Mott-gap in the case of monolayer $\alpha$-RuCl$_3$ in proximity
to graphite, but have little impact on its bulk form alone. In the Mott-Hubbard
framework, the transition is attributed to the lattice distortion-facilitated
substantial modulation of the electron correlation parameter. Observation of
the orbital textures on a highly compressed monolayer $\alpha$-RuCl$_3$ flake
on graphite provides valuable evidence that electrons are efficiently
transferred from the heterointerface into Cl3$p$ orbitals under the lattice
distortion. It is believed that the splitting of Ru $t_{2g}$ bands within the
trigonal distortion of Ru-Cl-Ru octahedra bonds generated the electrons
transfer pathways. The increase of the Cl3$p$ states enhance the hopping
integral in the Mott-Hubbard bands, resulting in the Mott-transition. These
findings suggest a new route for implementing the insulator-to-metal transition
upon doping in $\alpha$-RuCl$_3$ by deforming the lattice in addition to the
formation of heterostructure.
The need for fast and robust quantum state transfer is an essential element
in scalable quantum information processing, leading to widespread interest in
shortcuts to adiabaticity for speeding up adiabatic quantum protocols. However,
shortcuts to adiabaticity for systems with more than a few levels is
occasionally challenging to compute in theory and frequently difficult to
implement in experiments. In this work, we develop a protocol for constructing
shortcuts to adiabaticity through the multi-state Landau-Zener approach and a
stricter adiabatic condition. Importantly, our protocol only requires a few
pieces of information about the energy spectrum and adjusts the evolutionary
rate of the system, making it both generic for theoretical models and friendly
for experimental implementation. As examples, we apply our protocol to state
transfer in the non-Hermitian Su-Schrieffer-Heeger (SSH) model and the
topological Thouless pump models and find that it can speed up the manipulation
speed while remaining robust to Hamiltonian errors. Furthermore, our findings
can be realized using current technology and could potentially be extended to
many-body systems, dissipation cases, or Floquet processes. Overall, the
proposed shortcut protocol offers a promising avenue for enhancing the
efficiency and reliability of quantum state transfer protocols.
Grain boundaries in extremely confined colloidal smectics possess a
topological fine structure with coexisting nematic and tetratic symmetry of the
director field. An alternative way to approach the problem of smectic topology
is via the layer structure, which is typically more accessible in experiments
on molecular liquid crystals. Here, we translate the concept of endpoint
defects, which appear as tetratic disclinations of quarter charge in director
topology, to layer topology for two-dimensional smectics. By doing so, we
elaborate on further advantages of a topological concept evolving around the
layer structure rather than the director field, such as providing insight in
the structure of edge dislocations or virtual defects at the confining walls.
Solids undergoing a transition from order to disorder experience the
proliferation of topological defects. The melting process generates transient
quantum states. However, their dynamical nature with femtosecond lifetime
hinders exploration with atomic precision. Here, we suggest an alternative
approach to the dynamical melting process by focusing on the interface created
by competing degenerate quantum states. We use a scanning tunneling microscope
(STM) to visualize the unidirectional charge density wave (CDW) and its spatial
progression ("static melting") across a twin domain boundary (TDB) in the
layered material GdTe$_{3}$. Combining STM with a spatial lock-in technique, we
reveal that the order parameter amplitude attenuates with the formation of
dislocations and thus two different unidirectional CDWs coexist near the TDB,
reducing the CDW anisotropy. Notably, we discover a correlation between this
anisotropy and the CDW gap. Our study provides valuable insight into the
behavior of topological defects and transient quantum states.
Two-dimensional (2D) materials have garnered significant attention in recent
years due to their atomically thin structure and unique electronic and
optoelectronic properties. To harness their full potential for applications in
next-generation electronics and photonics, precise control over the dielectric
environment surrounding the 2D material is critical. The lack of nucleation
sites on 2D surfaces to form thin, uniform dielectric layers often leads to
interfacial defects that degrade the device performance, posing a major
roadblock in the realization of 2D-based devices. Here, we demonstrate a
wafer-scale, low-temperature process (< 250 {\deg}C) using atomic layer
deposition (ALD) for the synthesis of uniform, conformal amorphous boron
nitride (aBN) thin films. ALD deposition temperatures between 125 and 250
{\deg}C result in stoichiometric films with high oxidative stability, yielding
a dielectric strength of 8.2 MV/cm. Utilizing a seed-free ALD approach, we form
uniform aBN dielectric layers on 2D surfaces and fabricate multiple quantum
well structures of aBN/MoS2 and aBN-encapsulated double-gated monolayer (ML)
MoS2 field-effect transistors to evaluate the impact of aBN dielectric
environment on MoS2 optoelectronic and electronic properties. Our work in
scalable aBN dielectric integration paves a way towards realizing the
theoretical performance of 2D materials for next-generation electronics.
Understanding spin wave (SW) damping, and how to control it to the point of
being able to amplify SW-mediated signals, is one of the key requirements to
bring the envisaged magnonic technologies to fruition. Even widely used
magnetic insulators with low magnetization damping in their bulk, such as
yttrium iron garnet, exhibit 100-fold increase in SW damping due to inevitable
contact with metallic layers in magnonic circuits, as observed in very recent
experiments [I. Bertelli et al., Adv. Quantum Technol. 4, 2100094 (2021)]
mapping SW damping in spatially-resolved fashion. Here, we provide microscopic
and rigorous understanding of wavevector-dependent SW damping using extended
Landau-Lifshitz-Gilbert equation with nonlocal damping tensor, instead of
conventional local scalar Gilbert damping, as derived from Schwinger-Keldysh
nonequilibrium quantum field theory. In this picture, the origin of nonlocal
magnetization damping and thereby induced wavevector-dependent SW damping is
interaction of localized magnetic moments of magnetic insulator with conduction
electrons from the examined three different types of metallic overlayers --
normal, heavy, and altermagnetic. Due to spin-split energy-momentum dispersion
of conduction electrons in the latter two cases, the nonlocal damping is
anisotropic in spin and space, and it can be dramatically reduced by changing
the relative orientation of the two layers when compared to the usage of normal
metal overlayer.
We introduce methods of characterizing entanglement, in which entanglement
measures are enriched by the matrix representations of operators for
observables. These observable operator matrix representations can enrich the
partial trace over subsets of a system's degrees of freedom, yielding reduced
density matrices useful in computing various measures of entanglement, which
also preserve the observable expectation value. We focus here on applying these
methods to compute observable-enriched entanglement spectra, unveiling new
bulk-boundary correspondences of canonical four-band models for topological
skyrmion phases and their connection to simpler forms of bulk-boundary
correspondence. Given the fundamental roles entanglement signatures and
observables play in study of quantum many body systems, observable-enriched
entanglement is broadly applicable to myriad problems of quantum mechanics.
Chirality-induced spin selectivity (CISS) is an effect that has recently
attracted a great deal of attention in chiral chemistry and that remains to be
understood. In the CISS effect, electrons passing through chiral molecules
acquire a large degree of spin polarization. In this Letter we show that this
effect can be spectacularly large in atomically-thin chiral crystals created by
van der Waals assembly, provided they are spin-orbit coupled. Its origin stems
from the combined effects of structural chirality and spin-flipping spin-orbit
coupling. We present detailed calculations for twisted homobilayer transition
metal dichalcogenides, showing that the chirality-induced spin polarization can
be giant, e.g. easily exceeding $50\%$ for ${\rm MoTe}_2$. Our results clearly
indicate that twisted quantum materials can operate as a fully tunable platform
for the study and control of the CISS effect in condensed matter physics and
chiral chemistry.
Janus phoretic particles exploit chemical energy stored in their environment
to self-propel. These active particles modify and respond to their hydrodynamic
and chemical environments, thus giving them a sensibility to external flows and
other particles. Furthermore, experimental observations and analysis on
biological or synthetic active suspensions indicate that hydro-chemical
interparticle interactions lead to non-trivial collective behaviour (e.g.,
cluster formation of phoretic particles or bacterial swarming) and that the
response of the suspensions to shear flows is non-trivial. In fact, it can lead
to significant reductions in viscosity due to the energy conversion at
microscopic scales. In this work, using simulations of a continuum kinetic
model, we analyse the dynamics and response to shear and confinement of dilute
suspensions of chemotactic phoretic particles that reorient and drift toward
the chemical solutes released by their neighbours. We show that a 1D transient
steady distribution driven by the effect of confinement is a common feature
considered and analyse its stability for varying confinement strength and shear
rate. In the second step, we consider and discuss, more specifically, the
feedback effect on the flow by the particle and the resulting effective
viscosity of the suspension.
We perform a systematic study of the signatures of fragile topology in a
number of nonmagnetic two-dimensional materials belonging to space group 164,
most of them transition metal dichalcogenides. Using group theory analysis in
the framework of topological quantum chemistry, we find fragile bands near the
Fermi level for all the materials studied. Since stable topological bands are
also present in these systems, the interplay of both phases is discussed,
showing that corner charges appear in nearly three quarters of the materials
and that they are caused by fragile topology. Using first-principles
calculations, we predict corner states with fractional corner charges protected
by C3 symmetry. Our work aims to broaden the scope of materials with
experimentally accessible fragile bands.
While organic structure directing agents (OSDAs) are well known to have a
directional influence on the topology of a crystallizing zeolite, the
relationship between OSDA charge and siting of aliovalent ions on a primarily
siliceous framework is unclear. Here, we explore the relationship between OSDA
orientation, Al3+ siting, and lattice energy, taking as a model system CHA
zeolite occluded with N,N,N-trimethyl-1-adamantyl ammonium (TMAda+) at an Si/Al
ratio of 11/1. We use density functional theory calculations to parametrize a
fixed-charge classical model describing van der Waals and electrostatic
interactions between framework and OSDA. We enumerate and explore all possible
combinations of OSDA orientation and Al location (attending to Lowenstein's
rule) within a 36 T-site supercell. We find that interaction energies vary over
60 kJ/double-six-ring-unit (d6r). Further, analysis of configurations reveals
that energies are sensitive to Al-Al proximity, such that low energies are
associated with Al3+ pairs in 8-membered rings and higher energies associated
with Al3+ pairs in smaller 6- and 4-membered rings. Comparisons with Al siting
inferred from CHA zeolite crystallized with TMAda+ suggests that these computed
interaction energies are useful reporters of observed Al siting in CHA
synthesized with TMAda+.
Explaining biodiversity is a fundamental issue in ecology. A long-standing
puzzle lies in the paradox of the plankton: many species of plankton feeding on
a limited type of resources coexist, apparently flouting the competitive
exclusion principle (CEP), which holds that the number of predator (consumer)
species cannot exceed that of the resources at steady state. Here, we present a
mechanistic model and show that the intraspecific interference among the
consumers enables a plethora of consumer species to coexist at constant
population densities with only one or a handful of resource species. The
facilitated biodiversity is resistant to stochasticity, either with the
stochastic simulation algorithm or individual-based modeling. Our model
naturally explains the classical experiments that invalidate CEP,
quantitatively illustrates the universal S-shaped pattern of the rank-abundance
curves across a wide range of ecological communities, and can be broadly used
to resolve the mystery of biodiversity in many natural ecosystems.
The Mott insulator provides an excellent foundation for exploring a wide
range of strongly correlated physical phenomena, such as high-temperature
superconductivity, quantum spin liquid, and colossal magnetoresistance. A Mott
insulator with the simplest degree of freedom is an ideal and highly desirable
system for studying the fundamental physics of Mottness. In this study, we have
unambiguously identified such an anticipated Mott insulator in a van der Waals
layered compound Nb3Cl8. In the high-temperature phase, where interlayer
coupling is negligible, density functional theory calculations for the
monolayer of Nb3Cl8 suggest a half-filled flat band at the Fermi level, whereas
angle-resolved photoemission spectroscopy experiments observe a large gap. This
observation is perfectly reproduced by dynamical mean-field theory calculations
considering strong electron correlations, indicating a correlation-driven Mott
insulator state. Since this half-filled band derived from a single 2a1 orbital
is isolated from all other bands, the monolayer of Nb3Cl8 is an ideal
realization of the celebrated single-band Hubbard model. Upon decreasing the
temperature, the bulk system undergoes a phase transition, where structural
changes significantly enhance the interlayer coupling. This results in a
bonding-antibonding splitting in the Hubbard bands, while the Mott gap remains
dominant. Our discovery provides a simple and seminal model system for
investigating Mott physics and other emerging correlated states.
I describe a concrete and efficient real-space renormalization approach that
provides a unifying perspective on interface states in a wide class of
Hermitian and non-Hermitian models, irrespective of whether they obey a
traditional bulk-boundary principle or not. The emerging interface physics are
governed by a flow of microscopic interface parameters, and the properties of
interface states become linked to the fixed-point topology of this flow. In
particular, the quantization condition of interface states converts identically
into the question of the convergence to unstable fixed points. As its key
merit, the approach can be directly applied to concrete models and utilized to
design interfaces that induce states with desired properties, such as states
with a predetermined and possibly symmetry-breaking energy. I develop the
approach in general, and then demonstrate these features in various settings,
including for the design of circular, triangular and square-shaped complex
dispersion bands and associated arcs at the edge of a two-dimensional system.
Furthermore, I describe how this approach transfers to nonlinear settings, and
demonstrate the efficiency, practicability and consistency of this extension
for a paradigmatic model of topological mode selection by distributed saturable
gain and loss.
Recently, the Josephson diode effect (JDE), in which the superconducting
critical current magnitudes differ when the currents flow in opposite
directions, has attracted great interest. In particular, it was demonstrated
that gate-defined Josephson junctions based on magic-angle twisted bilayer
graphene showed a strong nonreciprocal effect when the weak-link region is
gated to a correlated insulating state at half-filling (two holes per moir\'e
cell). However, the mechanism behind such a phenomenon is not yet understood.
In this work, we show that the interaction-driven valley polarization, together
with the trigonal warping of the Fermi surface, induce the JDE. The valley
polarization, which lifts the degeneracy of the states in the two valleys,
induces a relative phase difference between the first and the second harmonics
of supercurrent and results in the JDE. We further show that the nontrivial
current phase relation, which is responsible for the JDE, also generates the
asymmetric Shapiro steps.
We introduce carbon Kagome nanotubes (CKNTs) -- a new allotrope of carbon
formed by rolling up sheets of Kagome graphene, and investigate the properties
of this material using first principles calculations. Based on the direction of
rolling, we identify two principal varieties of CKNTs -- armchair and zigzag,
and find that the bending stiffness associated with rolling Kagome graphene
into either type of CKNT is about a third of that associated with rolling
conventional graphene into carbon nanotubes (CNTs). Ab initio molecular
dynamics simulations indicate that both types of CKNTs are likely to exist as
stable structures at room temperature. Each CKNT explored here is metallic and
features dispersionless states (i.e., flat bands) throughout its Brillouin
zone, along with an associated singular peak in the electronic density of
states, close to the Fermi level. We calculate the mechanical and electronic
response of CKNTs to torsional and axial strains and compare against
conventional CNTs. We show in particular, that upon twisting, degenerate
dispersionless electronic states in CKNTs split, Dirac points and partially
flat bands emerge from the quadratic band crossing point at the Fermi level,
and that these features can be explained using a relatively simple
tight-binding model.
Overall, CKNTs appear to be unique and striking examples of realistic
elemental quasi-one-dimensional (1D) materials that can potentially display
fascinating collective material properties arising from the presence of
strongly correlated electrons. Additionally, distorted CKNTs may provide an
interesting material platform where flat band physics and chirality induced
anomalous transport effects may be studied together.
We consider the transverse field Ising model in $(2+1)$D, putting 12 spins at
the vertices of the regular icosahedron. The model is tiny by the exact
diagonalization standards, and breaks rotation invariance. Yet we show that it
allows a meaningful comparison to the 3D Ising CFT on $\mathbb{R}\times S^2$,
by including effective perturbations of the CFT Hamiltonian with a handful of
local operators. This extreme example shows the power of conformal perturbation
theory in understanding finite $N$ effects in models on regularized $S^2$. Its
ideal arena of application should be the recently proposed models of fuzzy
sphere regularization.
Parafermion zero modes can be trapped in the domain walls of quantum Hall
edges proximitized by superconductors and ferromagnets. The $\nu = 1/3$
fractional quantum Hall side strip arising due to edge reconstruction of a $\nu
= 1$ edge doubles the number of topological sectors such that each of them is
$Z_{2} \times Z_{2}$ degenerate. The many-body spectrum displays a $4\pi$
Josephson periodicity, with the states in each $Z_{2}$ being energetically
decoupled. Signatures of the new states appear in the fractional Josephson
current when the edge velocities are taken to be different.
The coherence length $\xi$ is a fundamental length scale of superconductors
which governs the sizes of Cooper pairs, vortices, Andreev bound states and
more. In existing microscopic theories of superconductivity, it is expected
that as the attractive interaction increases, $\xi$ decreases as the electrons
are bound together more strongly. In BCS theory, for example, the coherence
length is $\xi_\mathrm{BCS} = \hbar v_{F}/\Delta$, where $v_{F}$ is the Fermi
velocity and $\Delta$ is the pairing gap. It is clear that increasing $\Delta$
will shorten $\xi_\mathrm{BCS}$. However, the situation is puzzling for
superconductors with completely flat bands in which $v_{F}$ goes to zero and
$\xi_\mathrm{BCS}$ is expected to be zero. In this work, we show that the
quantum metric, which is the real part of the quantum geometric tensor, gives
rise to an anomalous contribution to the coherence length. Specifically, $\xi =
\sqrt{\xi_\mathrm{BCS}^2 +\ell_{\mathrm{qm}}^{2}}$ for a superconductor where
$\ell_{\mathrm{qm}}$ is the quantum metric contribution. In the flat band
limit, $\xi$ does not vanish but bound by $\ell_{\mathrm{qm}}$. Incredibly, for
the nontrivial flat bands with Chern number $C$, $\xi$ has a topological bound
of $\xi\geq a\sqrt{\vert C \vert/4\pi}$ where $a$ is the lattice constant.
Physically, the Cooper pair size of a superconductor cannot be squeezed down to
a size smaller than $\ell_{\mathrm{qm}}$ which is a fundamental length scale
determined by the quantum geometry of the bands. Finally, we calculate the
quantum metric contributions for the superconducting moir\'e graphene family
and show that the quantum metric effects are very important in these
superconductors.
In this work, we propose that Majorana zero modes can be realized at the
corners of a topologically trivial insulator with unconventionality. We
demonstrate that 1T-PtSe$_2$ is a symmetry indicator-free (SI-free)
unconventional insulator, originating from orbital hybridization between Pt $d$
and Se $p_{x,y}$ states. The new kind of SI-free unconventionality has no
symmetry eigenvalue indication. Instead, it is diagnosed directly by the
Wannier charge centers by using the one-dimensional Wilson loop method. The
obstructed edge states exhibit strong anisotropy and large Rashba splitting. By
introducing superconducting proximity and external magnetic field, the Majorana
corner modes can be obtained in 1T-PtSe$_2$ monolayer. In the end, we construct
a two-Bernevig-Hughes-Zhang model with anisotropy to capture the Majorana
physics.
We study three aspects of work statistics in the context of the fluctuation
theorem for the quantum spin chains by numerical methods based on
matrix-product states. First, we elaborate that the work done on the spin-chain
by a sudden quench can be used to characterize the quantum phase transitions
(QPT). We further obtain the numerical results to demonstrate its capability of
characterizing the QPT of both Landau-Ginzbrug types, such as the Ising chain,
or topological types, such as the Haldane chain. Second, we propose to use the
fluctuation theorem, such as Jarzynski's equality, which relates the real-time
correlator to the ratio of the thermal partition functions, as a benchmark
indicator for the numerical real-time evolving methods. Third, we study the
passivity of ground and thermal states of quantum spin chains under some cyclic
impulse processes. We show that the passivity of thermal states and ground
states under the hermitian actions are ensured by the second laws and
variational principles, respectively, and also verify it by numerical
calculations. Besides, we also consider the passivity of ground states under
non-hermitian actions, for which the variational principle cannot be applied.
Despite that, we find no violation of passivity from our numerical results for
all the cases considered in both Ising-like and Haldane-like chains.
A topological phase can be engineered in quantum physics from the Bloch
sphere of a spin-1/2 showing an hedgehog structure as a result of a radial
magnetic field. We elaborate on a relation between the formation of an
entangled wavefunction at one pole, in a two-spins model, and an interesting
pair of one-half topological numbers. Similar to Cooper pairs in
superconductors, the Einstein-Podolsky-Rosen pair or Bell state produces a half
flux quantization, which here refers to the halved flux of the Berry curvature
on the surface. These 1/2-numbers also reveal the presence of a free Majorana
fermion at a pole. The topological responses can be measured when driving from
north to south and also from a circularly polarized field at the poles
revealing the quantized or half-quantized nature of the protected transverse
currents. We show applications of entangled wavefunctions in band structures,
introducing a local topological marker in momentum space, to characterize the
topological response of two-dimensional semimetals in bilayer geometries.
Since the discovery of the fascinating properties in magic-angle graphene,
the exploration of moir\'e systems in other two-dimensional materials has
garnered significant attention and given rise to a field known as 'moir\'e
physics'. Within this realm, magnetic van der Waals heterostructure and the
magnetic proximity effect in moir\'e superlattices have also become subjects of
great interest. However, the spin-polarized transport property in this moir\'e
structures is still a problem to be explored. Here, we investigate the
spin-polarized transport properties in a moir\'e superlattices formed by a
two-dimensional ferromagnet CrI_3 stacked on a monolayer BAs, where the spin
degeneracy is lifted because of the magnetic proximity effect associated with
the moir\'e superlattices. We find that the conductance exhibits spin-resolved
miniband transport properties at a small twist angle because of the periodic
moir\'e superlattices. When the incident energy is in the spin-resolved
minigaps, the available states are spin polarized, thus providing a
spin-polarized current from the superlattice. Moreover, only a finite number of
moir\'e period is required to obtain a net spin polarization of 100\%. In
addition, the interlayer distance of the heterojunction is also moir\'e
modifiable, so a perpendicular electric field can be applied to modulate the
intensity and direction of the spin polarization. Our finding points to an
opportunity to realize spin functionalities in magnetic moir\'e superlattices.
Transition out of a topological phase is typically characterized by
discontinuous changes in topological invariants along with bulk gap closings.
However, as a clean system is geometrically punctured, it is natural to ask the
fate of an underlying topological phase. To understand this physics we
introduce and study both short and long-ranged toy models where a one
dimensional topological phase is subjected to bond percolation protocols. We
find that non-trivial boundary phenomena follow competing energy scales even
while global topological response is governed via geometrical properties of the
percolated lattice. Using numerical, analytical and appropriate mean-field
studies we uncover the rich phenomenology and the various cross-over regimes of
these systems. In particular, we discuss emergence of "fractured topological
region" where an overall trivial system contains macroscopic number of
topological clusters. Our study shows the interesting physics that can arise
from an interplay of geometrical disorder within a topological phase.
We analyze the two-body spectrum within the Hofstadter-Hubbard model on a
square lattice through an exact variational ansatz and study the topological
properties of its low-lying two-body bound-state branches. In particular we
discuss how the Hofstadter-Hubbard butterfly of the two-body branches evolves
as a function of onsite interactions and how to efficiently calculate their
Chern numbers using the Fukui-Hatsugai-Suzuki approach. Our numerical results
are fully consistent with the simple picture that appears in the
strong-coupling limit, where the attraction between fermions forms a composite
boson characterized by an effective hopping parameter and an effective
magnetic-flux ratio.
The concept of torsion in geometry, although known since long time, has not
gained considerable attention by the physics community until relatively
recently, due to its diverse and potentially important applications to a
plethora of contexts of physical interest. These range from novel materials,
such as graphene and graphene-like materials, to advanced theoretical ideas,
such as string theory and supersymmetry/supergravity and applications thereof
in understanding the dark sector of our Universe. This work reviews such
applications of torsion at different physical scales.
The intriguing interplay between topology and superconductivity has attracted
significant attention, given its potential for realizing topological
superconductivity. In this study, we investigate the transport properties of
the chiral Josephson effect in the quantum anomalous Hall insulators
(QAHIs)-based junction. We reveal a systematic crossover from edge-state to
bulk-state dominant supercurrents, with a notable $0-\pi$ transition observed
under non-zero magnetic flux through chemical potential adjustments. This
transition underscores the competition between bulk and chiral edge transport.
Furthermore, we identify an evolution among three distinct quantum interference
patterns: from a $2\Phi_0$-periodic oscillation pattern, to a $\Phi_0$-periodic
oscillation pattern, and then to an asymmetric Fraunhofer pattern ($\Phi_0 =
h/2e$ is the flux quantum, $h$ the Planck constant, and $e$ the electron
charge). Subsequently, we examine the influence of domains on quantum
interference patterns. Intriguingly, a distinctive Fraunhofer-like pattern
emerges due to coexistence of chiral edge states and domain wall states, even
when the chemical potential is within gap. These results not only advance the
theoretical understanding but also pave the way for the experimental discovery
of the chiral Josephson effect based on QAHI doped with magnetic impurities.

Date of feed: Fri, 15 Dec 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) **Defect-sensitive High-frequency Modes in a Three-Dimensional Artificial Magnetic Crystal. (arXiv:2312.08415v1 [cond-mat.mes-hall])**

Rajgowrav Cheenikundil, Massimiliano d'Aquino, Riccardo Hertel

**Topological fine structure of an energy band. (arXiv:2312.08436v1 [cond-mat.mes-hall])**

Hui Liu, Cosma Fulga, Emil J. Bergholtz, Janos Asboth

**Majorana modes in striped two-dimensional inhomogeneous topological superconductors. (arXiv:2312.08439v1 [cond-mat.mes-hall])**

Pasquale Marra, Daisuke Inotani, Takeshi Mizushima, Muneto Nitta

**Emergent Fermion Dynamical Symmetry for Monolayer Graphene in a Strong Magnetic Field. (arXiv:2312.08475v1 [cond-mat.mes-hall])**

Mike Guidry, Lianao Wu, Fletcher Williams

**Crystalline finite-size topology. (arXiv:2312.08552v1 [cond-mat.str-el])**

Michał J. Pacholski, Ashley M. Cook

**Measuring entanglement entropy and its topological signature for phononic systems. (arXiv:2312.08632v1 [quant-ph])**

Zhi-Kang Lin, Yao Zhou, Bin Jiang, Bing-Quan Wu, Li-Mei Chen, Xiao-Yu Liu, Li-Wei Wang, Peng Ye, Jian-Hua Jiang

**Unlocking High Performance, Ultra-Low Power Van der Waals Transistors: Towards Back-End-of-Line In-Sensor Machine Vision Applications. (arXiv:2312.08634v1 [cond-mat.mtrl-sci])**

Olaiyan Alolaiyan, Shahad Albwardi, Sarah Alsaggaf, Thamer Tabbakh, Frank W. DelRio, Moh. R. Amer

**Nonlinear optical responses in multi-orbital topological superconductors. (arXiv:2312.08638v1 [cond-mat.supr-con])**

Arpit Raj, Abigail Postlewaite, Swati Chaudhary, Gregory A. Fiete

**Electric-Field-Induced Domain Walls in Wurtzite Ferroelectrics. (arXiv:2312.08645v1 [cond-mat.mtrl-sci])**

Ding Wang, Danhao Wang, Mahlet Molla, Yujie Liu, Samuel Yang, Mingtao Hu, Jiangnan Liu, Yuanpeng Wu, Tao Ma, Emmanouil Kioupakis, Zetian Mi

**Real-time Autonomous Control of a Continuous Macroscopic Process as Demonstrated by Plastic Forming. (arXiv:2312.08658v1 [cond-mat.soft])**

Shun Muroga, Takashi Honda, Yasuaki Miki, Hideaki Nakajima, Don N. Futaba, Kenji Hata

**Confinement of electron holes via the peroxo group formation in the negative charge-transfer materials on the example of SrFeO3: plane-wave density functional theory predictions. (arXiv:2312.08665v1 [cond-mat.mtrl-sci])**

Nikita A. Afimchenko, Aleksandr A. Shubin, Igor L. Zilberberg, Alexander P. Nemudry

**Magneto-optical effects of an artificially-layered ferromagnetic topological insulator. (arXiv:2312.08687v1 [cond-mat.mtrl-sci])**

Xingyue Han, Hee Taek Yi, Seongshik Oh, Liang Wu

**Induced magneto-conductivity in a two-node Weyl semimetal under Gaussian random disorder. (arXiv:2312.08716v1 [cond-mat.mes-hall])**

Chuan-Xiong Xu, Hao-Ping Yu, Mei Zhou, Xuanting Ji

**Structure-driven phase transitions in paracrystalline topological insulators. (arXiv:2312.08779v1 [cond-mat.mes-hall])**

Victor Regis, Victor Velasco, Marcello B. Silva Neto, Caio Lewenkopf

**Automated Structure Discovery for Scanning Tunneling Microscopy. (arXiv:2312.08854v1 [cond-mat.mtrl-sci])**

Lauri Kurki, Niko Oinonen, Adam S. Foster

**Insulator-to-metal Mott transition facilitated by lattice deformation in monolayer $\alpha$-RuCl$_3$ on graphite. (arXiv:2312.08918v1 [cond-mat.str-el])**

Xiaohu Zheng, Ogasawara Takuma, Huaxue Zhou, Chongli Yang, Xin Han, Gang Wang, Junhai Ren, Youguo Shi, Katsumi Tanigaki, Rui-Rui Du

**A universal shortcut method for state transfer in quantum spin systems. (arXiv:2312.08920v1 [quant-ph])**

Jian Xu, Feng Mei, Yan-Qing Zhu

**Layer topology of smectic grain boundaries. (arXiv:2312.08964v1 [cond-mat.soft])**

René Wittmann

**Melting of unidirectional charge density waves across twin domain boundaries in GdTe$_{3}$. (arXiv:2312.08986v1 [cond-mat.str-el])**

Sanghun Lee, Eunseo Kim, Junho Bang, Jongho Park, Changyoung Kim, Dirk Wulferding, Doohee Cho

**Tailoring Amorphous Boron Nitride for High-Performance 2D Electronics. (arXiv:2312.09136v1 [cond-mat.mtrl-sci])**

Cindy Y. Chen (1), Zheng Sun (2), Riccardo Torsi (1), Ke Wang (3), Jessica Kachian (4), Bangzhi Liu (3), Gilbert B. Rayner Jr (5), Zhihong Chen (2), Joerg Appenzeller (2), Yu-Chuan Lin (6), Joshua A. Robinson (1, 3, 7) ((1) Department of Materials Science and Engineering, The Pennsylvania State University, (2) School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, (3) Materials Research Institute, The Pennsylvania State University, (4) Intel Corporation, (5) The Kurt J. Lesker Company, (6) Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, (7) Two-Dimensional Crystal Consortium, The Pennsylvania State University)

**Nonlocal damping of spin waves in a magnetic insulator induced by normal, heavy, or altermagnetic metallic overlayer: a Schwinger-Keldysh field theory approach. (arXiv:2312.09140v1 [cond-mat.mes-hall])**

Felipe Reyes-Osorio, Branislav K. Nikolic

**Observable-enriched entanglement. (arXiv:2312.09153v1 [quant-ph])**

Joe H. Winter, Reyhan Ay, Bernd Braunecker, A. M. Cook

**Giant chirality-induced spin polarization in twisted transition metal dichalcogenides. (arXiv:2312.09169v1 [cond-mat.mes-hall])**

Guido Menichetti, Lorenzo Cavicchi, Leonardo Lucchesi, Fabio Taddei, Giuseppe Iannaccone, Pablo Jarillo-Herrero, Frank H. L. Koppens, Marco Polini

**Self-organisation of auto-phoretic suspensions in confined shear flows. (arXiv:2312.09178v1 [cond-mat.soft])**

Prathmesh Vinze, Sebastien Michelin

**Fractional corner charges induced by fragile topology in threefold symmetric two-dimensional materials. (arXiv:2312.09240v1 [cond-mat.mes-hall])**

Olga Arroyo-Gascon, Sergio Bravo, Leonor Chico, Monica Pacheco

**Influence of N,N,N-trimethyl-1-adamantyl ammonium (TMAda+) Structure Directing Agent on Al Pair Distributions and Features in Chabazite Zeolite. (arXiv:2110.12523v5 [cond-mat.mtrl-sci] UPDATED)**

Xiaoyu Wang, Yujia Wang, Ahmad Moini, Rajamani Gounder, Edward J. Maginn, William F. Schneider

**Intraspecific predator interference promotes biodiversity in ecosystems. (arXiv:2112.05098v4 [q-bio.PE] UPDATED)**

Ju Kang, Shijie Zhang, Xin Wang

**Discovery of a Single-Band Mott Insulator in a van der Waals Flat-Band Compound. (arXiv:2205.11462v3 [cond-mat.str-el] UPDATED)**

Shunye Gao, Shuai Zhang, Cuixiang Wang, Shaohua Yan, Xin Han, Xuecong Ji, Wei Tao, Jingtong Liu, Tiantian Wang, Shuaikang Yuan, Gexing Qu, Ziyan Chen, Yongzhao Zhang, Jierui Huang, Mojun Pan, Shiyu Peng, Yong Hu, Hang Li, Yaobo Huang, Hui Zhou, Sheng Meng, Liu Yang, Zhiwei Wang, Yugui Yao, Zhiguo Chen, Ming Shi, Hong Ding, Huaixin Yang, Kun Jiang, Yunliang Li, Hechang Lei, Youguo Shi, Hongming Weng, Tian Qian

**Renormalization approach to the analysis and design of Hermitian and non-Hermitian interfaces. (arXiv:2208.14626v2 [cond-mat.mes-hall] UPDATED)**

Henning Schomerus

**Josephson Diode Effect Induced by Valley Polarization in Twisted Bilayer Graphene. (arXiv:2211.14846v4 [cond-mat.supr-con] UPDATED)**

Jin-Xin Hu, Zi-Ting Sun, Ying-Ming Xie, K. T. Law

**Carbon Kagome Nanotubes -- quasi-one-dimensional nanostructures with flat bands. (arXiv:2301.10200v3 [cond-mat.mtrl-sci] UPDATED)**

Hsuan Ming Yu, Shivam Sharma, Shivang Agarwal, Olivia Liebman, Amartya S. Banerjee

**3D Ising CFT and Exact Diagonalization on Icosahedron: The Power of Conformal Perturbation Theory. (arXiv:2307.02540v4 [hep-th] UPDATED)**

Bing-Xin Lao, Slava Rychkov

**Can Majorana zero modes in quantum Hall edges survive edge reconstruction?. (arXiv:2308.01980v2 [cond-mat.mes-hall] UPDATED)**

Kishore Iyer, Amulya Ratnakar, Sumathi Rao, Sourin Das

**Anomalous Coherence Length in Superconductors with Quantum Metric. (arXiv:2308.05686v2 [cond-mat.supr-con] UPDATED)**

Jin-Xin Hu, Shuai A. Chen, K. T. Law

**Majorana corner modes in unconventional monolayers of 1T-PtSe2 family. (arXiv:2308.12055v2 [cond-mat.mtrl-sci] UPDATED)**

Haohao Sheng, Yue Xie, Quansheng Wu, Hongming Weng, Xi Dai, B. Andrei Bernevig, Zhong Fang, Zhijun Wang

**Work statistics for Quantum Spin Chains: characterizing quantum phase transitions, benchmarking time evolution, and examining passivity of quantum states. (arXiv:2308.13366v3 [cond-mat.stat-mech] UPDATED)**

Feng-Li Lin, Ching-Yu Huang

**One-Half Topological Number in Entangled Quantum Physics. (arXiv:2308.14062v2 [cond-mat.mes-hall] UPDATED)**

Karyn Le Hur

**Spin-polarized transport properties in magnetic moir\'e superlattices. (arXiv:2308.14342v2 [cond-mat.mes-hall] UPDATED)**

Zhao Gong, Qing-Qing Zhang, Hui-Ying Mu, Xing-Tao An, Jian-Jun Liu

**Percolation Transition in a Topological Phase. (arXiv:2309.06483v2 [cond-mat.dis-nn] UPDATED)**

Saikat Mondal, Subrata Pachhal, Adhip Agarwala

**Chern numbers for the two-body Hofstadter-Hubbard butterfly. (arXiv:2310.09565v2 [cond-mat.quant-gas] UPDATED)**

D. C. Alyuruk, M. Iskin

**Torsion at different scales: from materials to the Universe. (arXiv:2310.13150v2 [gr-qc] UPDATED)**

Nick E. Mavromatos, Pablo Pais, Alfredo Iorio

**Effects of domain walls and chiral supercurrent in quantum anomalous Hall Josephson junctions. (arXiv:2312.00331v2 [cond-mat.mes-hall] UPDATED)**

Junjie Qi, Haiwen Liu, Jie Liu, Hua Jiang, Dong E. Liu, Chui-Zhen Chen, Ke He, X. C. Xie

Found 9 papers in prb Su-Schrieffer-Heeger (SSH) chains are paradigmatic examples of one-dimensional topological insulators hosting zero-energy edge modes when the bulk of the system has a nonzero topological winding invariant. Recently, high-harmonic spectroscopy has been suggested as a tool for detecting the topologica… Here, the authors determine thermodynamic properties of pyrochlore spin-ice compounds at subkelvin temperatures. In particular, the magnetic field dependence of the heat capacity and magnetic entropy of Ho${}_{2}$Ti${}_{2}$O${}_{7}$ and Pr${}_{2}$Hf${}_{2}$O${}_{7}$ shows the existence of additional states beyond the electronic spin and orbital degrees of freedom. One can understand the data through the presence of hyperfine states and complex hyperfine-coupled term schemes. Nonreciprocal gyrotropic materials have attracted significant interest recently in material physics, nanophotonics, and topological physics. Most of the well-known nonreciprocal materials, however, only show nonreciprocity under a strong external magnetic field and within a small segment of the elec… A magnetic insulator is an ideal platform to propagate spin information by exploiting magnon currents. However, until now, most studies have focused on ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (YIG) and a few other ferri- and antiferromagnetic insulators, but not on pure ferromagnets. In… Using large-scale quantum Monte Carlo simulations, we determine the ground state phase diagram of the spin-1/2 antiferromagnetic Heisenberg model on the honeycomb lattice for the most generic case of three varying interaction strengths along the different lattice directions. We identify continuous q… Superconductors (SCs) with nontrivial topological band structures in the normal state have been discovered recently in bulk materials. When such SCs are made into thin films, quantum tunneling and Cooper pairing take place between the topological surface states (TSSs) on the opposing surfaces. Here,… We propose a class of graphene-based moiré systems hosting flat bands on kagome and honeycomb moiré superlattices. These systems are formed by stacking a graphene layer on a 2D substrate with lattice constant approximately $\sqrt{3}$ times that of graphene. When the moiré potentials are induced by a… High-performance batteries, heterogeneous catalysts, and next-generation photovoltaics often centrally involve transition metal oxides (TMOs) that undergo charge or spin-state changes. Demand for accurate DFT modeling of TMOs has increased in recent years, driving improved quantification and correct… We explore the transformation of a surface plasmon on dynamic graphene with a periodic modulation of carrier density. We treat the stages of carrier density increases and decreases by using different constitutive relations, which are adequate to the physical mechanisms of carrier injection and remov…

Date of feed: Fri, 15 Dec 2023 04:17:06 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Topological phase detection through high-harmonic spectroscopy in extended Su-Schrieffer-Heeger chains**

Mohit Lal Bera, Jessica O. de Almeida, Marlena Dziurawiec, Marcin Płodzień, Maciej M. Maśka, Maciej Lewenstein, Tobias Grass, and Utso Bhattacharya

Author(s): Mohit Lal Bera, Jessica O. de Almeida, Marlena Dziurawiec, Marcin Płodzień, Maciej M. Maśka, Maciej Lewenstein, Tobias Grass, and Utso Bhattacharya

[Phys. Rev. B 108, 214104] Published Thu Dec 14, 2023

**Impact of hyperfine contributions on the ground state of spin-ice compounds**

J. Gronemann, S. Chattopadhyay, T. Gottschall, E. Osmic, A. T. M. N. Islam, V. K. Anand, B. Lake, H. Kaneko, H. Suzuki, J. Wosnitza, and T. Herrmannsdörfer

Author(s): J. Gronemann, S. Chattopadhyay, T. Gottschall, E. Osmic, A. T. M. N. Islam, V. K. Anand, B. Lake, H. Kaneko, H. Suzuki, J. Wosnitza, and T. Herrmannsdörfer

[Phys. Rev. B 108, 214412] Published Thu Dec 14, 2023

**First-principles study of large gyrotropy in MnBi for infrared thermal photonics**

Md Roknuzzaman, Sathwik Bharadwaj, Yifan Wang, Chinmay Khandekar, Dan Jiao, Rajib Rahman, and Zubin Jacob

Author(s): Md Roknuzzaman, Sathwik Bharadwaj, Yifan Wang, Chinmay Khandekar, Dan Jiao, Rajib Rahman, and Zubin Jacob

[Phys. Rev. B 108, 224307] Published Thu Dec 14, 2023

**Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films**

M. Xochitl Aguilar-Pujol, Sara Catalano, Carmen González-Orellana, Witold Skowroński, Juan M. Gomez-Perez, Maxim Ilyn, Celia Rogero, Marco Gobbi, Luis E. Hueso, and Fèlix Casanova

Author(s): M. Xochitl Aguilar-Pujol, Sara Catalano, Carmen González-Orellana, Witold Skowroński, Juan M. Gomez-Perez, Maxim Ilyn, Celia Rogero, Marco Gobbi, Luis E. Hueso, and Fèlix Casanova

[Phys. Rev. B 108, 224420] Published Thu Dec 14, 2023

**Anomalous scaling corrections and quantum phase diagram of the Heisenberg antiferromagnet on the spatially anisotropic honeycomb lattice**

Alexander Sushchyev and Stefan Wessel

Author(s): Alexander Sushchyev and Stefan Wessel

[Phys. Rev. B 108, 235146] Published Thu Dec 14, 2023

**Intrinsic chiral topological superconductor thin films**

Xi Luo, Yu-Ge Chen, Ziqiang Wang, and Yue Yu

Author(s): Xi Luo, Yu-Ge Chen, Ziqiang Wang, and Yue Yu

[Phys. Rev. B 108, 235147] Published Thu Dec 14, 2023

**Kagome and honeycomb flat bands in moiré graphene**

Michael G. Scheer and Biao Lian

Author(s): Michael G. Scheer and Biao Lian

[Phys. Rev. B 108, 245136] Published Thu Dec 14, 2023

**Optimization strategies developed on NiO for Heisenberg exchange coupling calculations using projector augmented wave based first-principles DFT+U+J**

Lórien MacEnulty and David D. O'Regan

Author(s): Lórien MacEnulty and David D. O'Regan

[Phys. Rev. B 108, 245137] Published Thu Dec 14, 2023

**Surface plasmon transformation on dynamic graphene with a periodic modulation of carrier density**

A. V. Shirokova, A. V. Maslov, and M. I. Bakunov

Author(s): A. V. Shirokova, A. V. Maslov, and M. I. Bakunov

[Phys. Rev. B 108, 245139] Published Thu Dec 14, 2023

Found 2 papers in prl Valleytronics is a research field utilizing a valley degree of freedom of electrons for information processing and storage. A strong valley polarization is critical for realistic valleytronic applications. Here, we predict a tunneling valley Hall effect (TVHE) driven by tilted Dirac fermions in all-… The topology of electronic and phonon band structures of graphene is well studied and known to exhibit a Dirac cone at the $K$ point of the Brillouin zone. Here, we applied inelastic x-ray scattering (IXS) along with

Date of feed: Fri, 15 Dec 2023 04:17:03 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) **Tunneling Valley Hall Effect Driven by Tilted Dirac Fermions**

Shu-Hui Zhang, Ding-Fu Shao, Zi-An Wang, Jin Yang, Wen Yang, and Evgeny Y. Tsymbal

Author(s): Shu-Hui Zhang, Ding-Fu Shao, Zi-An Wang, Jin Yang, Wen Yang, and Evgeny Y. Tsymbal

[Phys. Rev. Lett. 131, 246301] Published Thu Dec 14, 2023

**Phonon Topology and Winding of Spectral Weight in Graphite**

N. D. Andriushin, A. S. Sukhanov, A. N. Korshunov, M. S. Pavlovskii, M. C. Rahn, and S. E. Nikitin

Author(s): N. D. Andriushin, A. S. Sukhanov, A. N. Korshunov, M. S. Pavlovskii, M. C. Rahn, and S. E. Nikitin*ab initio* calculations to investigate phonon topology in graphite, the 3D analog of…

[Phys. Rev. Lett. 131, 246601] Published Thu Dec 14, 2023

Found 1 papers in prx Combining two ultrafast spectroscopy techniques allows for measurements of the electron-phonon coupling in two prototypical topological materials.

Date of feed: Fri, 15 Dec 2023 04:17:04 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Ultrafast Measurements of Mode-Specific Deformation Potentials of ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$ and ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$**

Yijing Huang *et al.*

Author(s): Yijing Huang *et al.*

[Phys. Rev. X 13, 041050] Published Thu Dec 14, 2023

Found 1 papers in pr_res We investigate deep-learning-unique first-order and second-order phase transitions, whose phenomenology closely follows that in statistical physics. In particular, we prove that the competition between prediction error and model complexity in the training loss leads to the second-order phase transit…

Date of feed: Fri, 15 Dec 2023 04:17:03 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) **Zeroth, first, and second-order phase transitions in deep neural networks**

Liu Ziyin and Masahito Ueda

Author(s): Liu Ziyin and Masahito Ueda

[Phys. Rev. Research 5, 043243] Published Thu Dec 14, 2023