Found 35 papers in cond-mat From the perspective of quantum many-body physics, the Floquet code of
Hastings and Haah can be thought of as a measurement-only version of the Kitaev
honeycomb model where a periodic sequence of two-qubit XX, YY, and ZZ
measurements dynamically stabilizes a toric code state with two logical qubits.
However, the most striking feature of the Kitaev model is its intrinsic
fractionalization of quantum spins into an emergent gauge field and itinerant
Majorana fermions that form a Dirac liquid, which is absent in the Floquet
code. Here we demonstrate that by varying the measurement strength of the
honeycomb Floquet code one can observe features akin to the fractionalization
physics of the Kitaev model at finite temperature. Introducing coherent errors
to weaken the measurements we observe three consecutive stages that reveal
qubit fractionalization (for weak measurements), the formation of a Majorana
liquid (for intermediate measurement strength), and Majorana pairing together
with gauge ordering (for strong measurements). Our analysis is based on a
mapping of the imperfect Floquet code to random Gaussian fermionic circuits
(networks) that can be Monte Carlo sampled, exposing two crossover peaks. With
an eye on circuit implementations, our analysis demonstrates that the Floquet
code, in contrast to the toric code, does not immediately break down to a
trivial state under weak measurements, but instead gives way to a long-range
entangled Majorana liquid state.
We present an in-depth study of the competition between skyrmions and a
chiral spin liquid in a model on the kagome lattice that was recently proposed
by some of the authors [H. D. Rosales, et al. Phys. Rev. Lett. 130, 106703
(2023)]. We present an analytical overview of the low-energy states using the
Luttinger-Tisza approximation. Then we add thermal fluctuations thanks to
large-scale Monte-Carlo simulations, and explore the entire parameter space
with a magnetic field $B$, in-plane $D^{xy}$ and out-of-plane $D^z$
Dzyaloshinskii-Moriya interactions, using the ferromagnetic strength as unit of
energy. While skyrmions and the chiral spin liquid live in different regions of
parameter space, we show how to bring them together, stabilizing a skyrmion
fluid in between; a region where the density of well-defined skyrmions can be
tuned from quasi-zero (gas) to saturated (liquid) before ordering of the
skyrmions (solid). In particular, we investigate the two-dimensional melting of
the skyrmion solid. Our analysis also brings to light a long-range ordered
phase with Z$_3$ symmetry. To conclude, when conduction electrons are coupled
to the local spins, different chiral magnetic textures stabilized in this model
(skyrmion solid, liquid and gas \& chiral spin liquid) induce anomalous Quantum
Hall effect in the magnetically disordered skyrmion liquid for specific
band-filling fractions. Landau levels persist even in the skyrmion-liquid
regime in absence of broken translational symmetry and gradually disappear as
the skyrmion density decreases to form a gas.
Engineering of magnetic heterostructures for spintronic applications has
entered a new phase, driven by the recent discoveries of topological materials
and exfoliated van der Waals materials. Their low-dimensional properties can be
dramatically modulated in designer heterostructures via proximity effects from
adjacent materials, thus enabling the realization of diverse quantum states and
functionalities. Here we investigate spin-orbit coupling (SOC) proximity
effects of Pt on the recently discovered quasi-two-dimensional ferromagnetic
state at FeSi surface. Skyrmionic bubbles (SkBs) are formed as a result of the
enhanced interfacial Dzyloshinskii-Moriya interaction. The strong pinning
effects on the SkBs are evidenced from the significant dispersion in size and
shape of the SkBs and are further identified as a greatly enhanced threshold
current density required for depinning of the SkBs. The robust integrity of the
SkB assembly leads to the emergence of higher-order nonlinear Hall effects in
the high current density regime, which originate from nontrivial Hall effects
due to the noncollinearity of the spin texture, as well as from the
current-induced magnetization dynamics via the augmented spin-orbit torque.
The twig edge states in graphene-like structures are viewed as the fourth
states complementary to their zigzag, bearded, and armchair counterparts. In
this work, we study a rod-in-plasma system in honeycomb lattice with twig edges
under external magnetic fields and lattice scaling and show that twig edge
states can exist in different phases of the system, such as quantum Hall phase,
quantum spin Hall phase and insulating phase. The twig edge states in the
quantum Hall phase exhibit robust one-way transmission property immune to
backscattering and thus provide a novel avenue for solving the plasma
communication blackout problem. Moreover, we demonstrate that corner and edge
states can exist within the trivial band gap of the insulating phase by
modulating the on-site potential of the twig edges. Especially, helical edge
states with the unique feature of pseudospin-momentum locking that could be
exited by chiral sources are demonstrated at the twig edges within the trivial
band gap. Our results show that many topological-like behaviors of
electromagnetic waves are not necessarily tied to the exact topology of the
systems and the twig edges and interface engineering can bring new
opportunities for more flexible manipulation of electromagnetic waves.
Bulk-boundary correspondence is a concept for topological insulators and
superconductors that determines the existence of topological boundary states
within the tenfold classification table. Contrary to this belief, we
demonstrate that topological domain-wall states can emerge in all forbidden 1D
classes in the classification table using representative generalized
Su-Schrieffer-Heeger and Kitaev models, which manifests as quantized electric
dipole moments and Majorana zero modes, respectively. We first show that a
zero-energy domain-wall state can possess a quantized polarization, even if the
polarization of individual domains is not inherently quantized. A quantized
Berry phase difference between the domains confirms the non-trivial nature of
the domain-wall states, implying a general-bulk-boundary principle, further
confirmed by the tight-binding, topological field, and low-energy effective
theories. Our methodology is then extended to a superconducting system,
resulting in Majorana zero modes on the domain wall of a generalized Kitaev
model. Finally, we suggest potential systems where our results may be realized,
spanning from condensed matter to optical.
The shock strength dependent formation of diamond represents one of the most
intriguing questions in graphite research. Using ab initio DFT-trained carbon
GNN model, we observe a strength-dependent graphite transition under shock. The
poor sliding caused by scarce sliding time under high-strength shock forms
hexagonal diamond with an orientation of (001)G//(100)HD+[010]G//[010]HD; under
low-strength shock, cubic diamond forms after enough sliding time, unveiling
the strength-dependent graphite transition. We provide computational evidence
of the strength-dependent graphite transition from first principles, clarifying
the long-term shock-induced hexagonal formation and structural
strength-dependent trend source.
The absence of efficient light modulators for extreme ultraviolet (EUV) and
X-ray photons significantly limits their real-life application, particularly
when even slight complexity of the beam patterns is required. Here we report on
a novel approach to reversible imprinting of a holographic mask in an
electronic Wigner crystal material with a sub-90 nm feature size. The structure
is imprinted on a sub-picosecond time-scale using EUV laser pulses and acts as
a high-efficiency diffraction grating that deflects EUV or soft X-ray light.
The imprinted nanostructure is stable after the removal of the exciting beams
at low temperatures but can be easily erased by a single heating beam. Modeling
shows that the efficiency of the device can exceed 1%, approaching
state-of-the-art etched gratings, but with the benefit of being programmable
and tunable over a large range of wavelengths. The observed effect is based on
the rapid change of lattice constant upon transition between metastable
electronically-ordered phases in a layered transition metal dichalcogenide. The
proposed approach is potentially useful for creating tunable light modulators
in the EUV and soft X-ray spectral ranges.
The onset of the topological phase transition in a two-dimensional model for
a Chern Insulator, namely the Qi-Wu-Zhang(QWZ) model, is illustrated, with
particular emphasis on the appearance of chiral edge-modes. The edge-modes are
studied by analysing the dynamics of the edge-states in an equivalent model for
a one-dimensional charge pump, using a technique known as dimensional
extension. A further real-space analysis allows us to explain the onset of the
topological phase transition in terms of time-reversal symmetry breaking and to
quantitatively study the localisation of the edge-modes.
Hexagonal boron-nitride (h-BN) provides an ideal substrate for supporting
graphene devices to achieve fascinating transport properties, such as Klein
tunneling, electron optics and other novel quantum transport phenomena.
However, depositing graphene on h-BN creates moir\'e superlattices, whose
electronic properties can be significantly manipulated by controlling the
lattice alignment between layers. In this work, the effects of these moir\'e
structures on the transport properties of graphene are investigated using
atomistic simulations. At large misalignment angles (leading to small moir\'e
cells), the transport properties (most remarkably, Klein tunneling) of pristine
graphene devices are conserved. On the other hand, in the nearly aligned cases,
the moir\'e interaction induces stronger effects, significantly affecting
electron transport in graphene. In particular, Klein tunneling is significantly
degraded. In contrast, strong Fabry-P\'erot interference (accordingly, strong
quantum confinement) effects and non-linear I-V characteristics are observed.
P-N interface smoothness engineering is also considered, suggesting as a
potential way to improve these transport features in graphene/h-BN devices.
The 2D semiconducting transition metal dichalcogenides (e.g., WS2) host
strong coupling between various degrees of freedom leading to potential
applications in next-generation device applications including optoelectronics.
Such applications are strongly influenced by defects which can control both the
optical and electronic properties of the material. We demonstrate the
possibility to tailor the defect-related electronic states and the lattice
dynamics properties of WS2 in their heterostructures with h-BN which host a
strong interlayer coupling between the charge carriers in the WS2 layer and the
phonons of h-BN. This coupling is observed to induce modifications to the
interlayer phonons (manifested by their modified Raman-activity) and to the
charge carrier mobilities in the WS2 layer (which results in creation of
mid-gap energy states associated with many-body quasiparticle states). Our
study also includes a detailed characterization of the defects through Raman
measurements revealing an A_1g-type nature with differential resonance behavior
for the modes that are related to defect scattering with respect to the other
normal phonon modes of WS2.
Utilizing an interplay between band topology and intrinsic magnetism, the
two-dimensional van der Waals (vdW) system MnBi_2Te_4 provides an ideal
platform for realizing exotic quantum phenomena and offers great opportunities
in the emerging field of antiferromagnetic spintronic technology. Yet, the
fabrication of MnBi_2Te_4-based nanodevices is hindered by the high sensitivity
of this material, which quickly degrades when exposed to air or to elevated
temperatures. Here, we demonstrate an alternative route of fabricating
vdW-MnBi_2Te_4-based electronic devices using the cryogenic dry transfer of a
printable circuit embedded in an inorganic silicon nitride membrane. The
electrical connections between the thin crystal and the top surface of the
membrane are established through via contacts. Our magnetotransport study
reveals that this innovative via contact approach enables exploring the
MnBi_2Te_4-like sensitive 2D materials and engineering synthetic
heterostructures as well as complex circuits based on the two-dimensional vdW
systems.
Non-Hermitian systems have garnered significant attention due to the
emergence of novel topology of complex spectra and skin modes. However,
investigating transport phenomena in such systems faces obstacles stemming from
the non-unitary nature of time evolution. Here, we establish the continuity
equation for a general non-Hermitian Hamiltonian in the Schr\"odinger picture.
It attributes the universal non-conservativity to the anti-commutation
relationship between particle number and non-Hermitian terms. Our work derives
a comprehensive current formula for non-Hermitian systems using Green's
function, applicable to both time-dependent and steady-state responses. To
demonstrate the validity of our approach, we calculate the local current in
models with one-dimensional and two-dimensional settings, incorporating
scattering potentials. The spatial distribution of local current highlights the
widespread non-Hermitian phenomena, including skin modes, non-reciprocal
quantum dots, and corner states. Our findings offer valuable insights for
advancing theoretical and experimental research in the transport of
non-Hermitian systems.
In our short review, we consider the transport properties of strongly
correlated Fermi systems like heavy fermion metals and high-$T_c$
superconductors. Their transport properties are defined by strong
inter-particle interaction forming flat bands in these compounds. Indeed, in
contrast to the behavior of the transport properties of conventional metals,
the strongly correlated compounds exhibit the linear in temperature
resistivity, $\rho(T)\propto T$. We analyze the magnetoresistance and show that
it under the application of magnetic field becomes negative. It is shown that
near a quantum phase transition, when the density of electronic states
diverges, semiclassical physics remains applicable to describe the resistivity
$\rho$ of strongly correlated metals due to the presence of a transverse
zero-sound collective mode, representing the phonon mode in solids. We
demonstrate that when $T$ exceeds the extremely low Debye temperature $T_D$,
the resistivity $\rho(T)$ changes linearly with $T$, since the mechanism of
formation of the $T$-dependence $\rho(T)$ is similar electron-phonon mechanism,
which predominates at high temperatures in ordinary metals. Thus, in the region
of $T$-linear resistance, electron-phonon scattering leads to a lifetime of
$\tau$ quasiparticles practically independent of the material, which is
expressed as the ratio of the Planck constant $\hbar$ to the Boltzmann constant
constant $k_B$, $T\tau\sim \hbar/k_B$. We explain that due to the
non-Fermi-liquid behavior the real part of the frequency-dependent optical
conductivity $\sigma^R_{opt}(\omega)$ exhibits a scaling behavior, and
demonstrates the unusual power law behavior
$\sigma^R_{opt}(\omega)\propto\omega^{-1}$, rather than the well-known one
shown by conventional metals, $\sigma^R_{opt}(\omega)\propto\omega^{-2}$.
Two dimensional (2D) layered transition-metal-based tellurides (chalcogens)
are known to harness their surface atoms characteristics to enhance
topographical activities for energy conversion, storage, and magnetic
applications. High surface energy due to unsaturated dangling bonds and larger
lateral size than the thickness (volume) makes them a potential candidate for
emerging electronics. Nevertheless, the gradual stacking of each sheet alters
the surface atoms' subtle features, such as lattice expansion, leading to
several phenomena and rendering tunable properties. In the present work, we
have monitored thickness-dependent properties of the 2D CoTe2 sheets from
nanoscale mechanics, tribology, surface potential distributions, interfacial
interaction and magnetism using atomically resolved spectroscopy and different
surface probe techniques, in conjunction with theoretical investigations:
density functional theory (DFT) and molecular dynamics (MD). The variation in
properties observed in theoretical investigation unleashes the crucial role of
crystal planes of the CoTe2. The presented results are beneficial in expanding
the use of 2D telluride family in flexible electronics, piezo sensors,
tribo-generator, and next-generation memory devices.
We investigate the Josephson diode effect in topological Josephson junctions.
We find that while a Josephson junction in the topological phase may exhibit
higher diode efficiency compared to that in the trivial phase, this behavior is
not universal. The presence of Majorana bound states is not a sufficient
condition for a large diode effect. Furthermore, the diode efficiency undergoes
substantial changes only in specific regions along the topological phase
transition boundary, and a significant diode effect does coincide with the
topological phases. Thereby the Josephson diode effect may be serves as a weak
indicator for topological superconductor phase. These results suggest a nuanced
relationship between the topological aspects of Josephson junctions and
Josephson diode effect.
We computationally demonstrate Stoner-ferromagnetic half-metals and
antiferromagnetic Mott-Hubbard insulators in metal-free 2D polymers. Coupling
radicaloid (hetero)triangulene monomers via strong covalent bonds preserving
the in-plane conjugation of the electronic {\pi} system yields 2D crystals with
long-range magnetic order and magnetic couplings above the Landauer limit.
Dual-site honeycomb lattices produce both flat bands and Dirac cones. Depending
on the monomers, electron correlations lead to either a bandgap at the Dirac
points for antiferromagnetic Mott insulators, or Stoner ferromagnetism with
both spin-polarized Dirac cones and flat bands at the Fermi level. These
results pioneer a new type of Stoner and Mott-Hubbard magnetism emerging in the
electronic pi system of crystalline conjugated 2D polymers.
The family of transition metal dipnictides (TMDs) has been of theoretical and
experimental interest because this family hosts topological states and
extremely large magnetoresistance (MR). Recently, TaAs2, a member of this
family, has been predicted to support a topological crystalline insulating
state. Here, by using high resolution. Angle resolved photoemission
spectroscopy (ARPES), we reveal both closed and open pockets in the metallic
Fermi surface and linearly dispersive bands on the (201) surface, along with
the presence of extreme MR observed from magneto-transport measurements. A
comparison of the ARPES results with first-principles computations show that
the linearly dispersive bands on the measured surface of TaAs2 are trivial bulk
bands. The absence of symmetry-protected surface state on the (201) surface
indicates its topologically dark nature. The presence of open Fermi surface
features suggests that the open orbit fermiology could contribute to the
extremely large MR of TaAs.
Recent discovery of ultrathick $\mathrm{MoSi_2N_4(MoN)_n}$ monolayers open up
an exciting platform to engineer 2D material properties via intercalation
architecture. Here we computationally investigate a series of ultrathick
MA$_2$N$_4$(M'N) monolayers (M, M' = Mo, W; A = Si, Ge) under both homolayer
and heterolayer intercalation architectures in which the same and different
species of transition metal nitride inner core layers are intercalated by outer
passivating nitride sublayers, respectively. The MA$_2$N$_4$(M'N) monolayers
are thermally, dynamically and mechanically stable with excellent mechanical
strength and metallic properties. Intriguingly, the metallic states around
Fermi level are localized within the inner core layers. Carrier conduction
mediated by electronic states around the Fermi level is thus spatially
insulated from the external environment by the native outer nitride sublayers,
suggesting the potential of MA$_2$N$_4$(M'N) in back-end-of-line (BEOL) metal
interconnect applications. Nitrogen vacancy defect at the outer sublayers
creates `punch through' states around the Fermi level that bridges the carrier
conduction in the inner core layers and the outer environment, forming a
electrical contact akin to the `vias' structures of metal interconnects. We
further show that MoSi$_2$N$_4$(MoN) can serve as a quasi-Ohmic contact to 2D
WSe$_2$. These findings reveal the promising potential of ultrathick
MA$_2$N$_4$(MN) monolayers as metal electrodes and BEOL interconnect
applications.
The realization of single-pair chiral fermions in Weyl systems remains
challenging in topology physics, especially for the systems with higher chiral
charges $|C|$. In this work, based on the symmetry analysis and low-energy
effective model, we propose that single-pair high-fold topological fermions
with $C$ = $\pm{2}$ can be achieved in chiral space groups P2$_1$3, P4$_3$32,
and P4$_1$32. Here, a single pair of Weyl points with the oppositely chiral
charges of $|C| = 2$ has been proved by the minimal lattice model and shows the
unique characteristics compared to multi-pair Weyl fermionic systems, including
the larger nontrivial energy window and the ultralong double Fermi arcs
extended to the whole Brillouin zone. Furthermore, we show the first ultralight
chiral crystal P4$_3$32-type LiC$_2$ and its inversion enantiomer as
high-quality candidate materials, whose Weyl nodes exhibit the large linear
energy range to surmount the interruption of irrelevant bands, and we observe a
reversal of their Fermi-arc velocities. Our work not only provides a promising
platform for detecting ultralong chiral fermi arcs but also certainly leads to
continued exploration of unconventional fermions.
We report the experimental observation of large spin pumping signals in
YIG/Pt system driven by broad-wavevector spin-wave spin current. 280 nm-wide
microwave inductive antennas offer broad-wavevector excitation which, in
combination with quasi-flatband of YIG, allows a large number of magnons to
participate in spin pumping at a given frequency. Through comparison with
ferromagnetic resonance spin pumping, we attribute the enhancement of the spin
current to the multichromatic magnons. The high efficiency of spin current
generation enables us to uncover nontrivial propagating properties in ultra-low
power regions. Additionally, our study achieves the spatially separated
detection of magnons, allowing the direct extraction of the decay length. The
synergistic combination of the capability of broad-wavevector excitation,
enhanced voltage signals, and nonlocal detection provides a new avenue for the
electrical exploration of spin waves dynamics.
Slowing down light in on-chip photonic devices strongly enhances light-matter
interaction, but typically also leads to increased backscattering and
small-bandwidth operation. It was shown re- cently that, if one modifies the
edge termination of a photonic Chern insulator such that the edge mode wraps
many times around the Brillouin zone, light can be slowed to arbitrarily low
group velocity over a large bandwidth, without being subject to backscattering.
Here we study the robust- ness of these in-gap slow light modes against
fabrication disorder, finding that disorder on scales significantly larger than
the minigaps between edge bands is tolerable. We identify the mechanism for
wavepacket breakup as disorder-induced velocity renormalization and calculate
the associated breakup time.
Recently, layered kagome metals AV$_3$Sb$_5$ (A = K, Rb, and Cs) have emerged
as a fertile platform for exploring frustrated geometry, correlations, and
topology. Here, using first-principles and mean-field calculations, we
demonstrate that AV$_3$Sb$_5$ can crystallize in a mono-layered form, revealing
a range of properties that render the system unique. Most importantly, the
two-dimensional monolayer preserves intrinsically different symmetries from the
three-dimensional layered bulk, enforced by stoichiometry. Consequently, the
van Hove singularities, logarithmic divergences of electronic density of
states, are enriched, leading to a variety of competing instabilities such as
doublets of charge density waves and s-and d-wave superconductivity. We show
that the competition between orders can be fine-tuned in the monolayer via
electron-filling of the van Hove singularities. Thus, our results suggest the
monolayer kagome metal AV$_3$Sb$_5$ as a promising platform for designer
quantum phases.
The Hofstadter energy spectrum of twisted bilayer graphene is found to have
recursive higher-order topological properties. We demonstrate that higher-order
topological insulator (HOTI) phases, characterized by localized corner states,
occur as replicas of the original HOTIs to fulfill the self-similarity of the
Hofstadter spectrum. We show the existence of the exact flux translational
symmetry of twisted bilayer graphene at all commensurate angles. Based on this
result, we carefully identify that the original HOTI phase at zero flux is
re-entrant at a half-flux periodicity, where the effective twofold rotation is
preserved. In addition, numerous replicas of the original HOTIs are found for
fluxes without protecting symmetries. Similar to the original HOTIs, replica
HOTIs feature both localized corner states and edge-localized real-space
topological markers. The replica HOTIs originate from the different interaction
scales, namely, intralayer and interlayer couplings, in twisted bilayer
graphene. The topological aspect of Hofstadter butterflies revealed in our
results highlights symmetry-protected topology in quantum fractals.
Advancements in nanotechnology continue to unearth material vistas that
presage a new age of revolutionary functionalities replete with unparalleled
physical properties and avant-garde chemical capabilities that promise sweeping
paradigm shifts in energy, environment, telecommunications and potentially
healthcare. At the upper echelons of this realm, the pnictogen and chalcogen
class of honeycomb layered oxides have emerged with fascinating crystal
chemistry and exotic electromagnetic and topological phenomena that muster
multifaceted concepts spanning from materials science to condensed matter
physics and potential applications in electrochemistry, quantum mechanics and
electronics. In a bid to shed light on the mechanisms governing these
biomimetic nanostructures, this review highlights the significant milestones
and breakthroughs that have augmented their current fundamental theory,
properties, and utilities. Herein, we elucidate the vast promising crystal
chemistry space against the backdrop of known synthesis and characterisation
techniques employed in the development and optimisation of this class of
honeycomb layered oxides. Further, we highlight key theoretical models that
have reinvigorated the exploration and characterisation of within this class of
materials and are poised to redefine the frontiers of material research and
their applications. We conclude by envisaging future research directions where
fascinating physicochemical, topological and electromagnetic properties could
be lurking and where valiant efforts ought to be inclined, particularly in the
prospective realisation of exotic material compositional space as well as their
utility as testing grounds for emergent two-dimensional (2D) topological
quantum gravity and conformal field theories.
C-H bond activation enables the facile synthesis of new chemicals. While C-H
activation in short-chain alkanes has been widely investigated, it remains
largely unexplored for long-chain organic molecules. Here, we report
light-driven C-H activation in complex organic materials mediated by 2D
transition metal dichalcogenides (TMDCs) and the resultant solid-state
synthesis of luminescent carbon dots in a spatially-resolved fashion. We
unravel the efficient H adsorption and a lowered energy barrier of C-C coupling
mediated by 2D TMDCs to promote C-H activation. Our results shed light on 2D
materials for C-H activation in organic compounds for applications in organic
chemistry, environmental remediation, and photonic materials.
Twisted bilayer MoTe$_2$ is a promising platform to investigate the interplay
between band topology and many-body interaction. We present a theoretical study
of its interaction-driven quantum phase diagrams based on a three-orbital
model, which can be viewed as a generalization of the Kane-Mele-Hubbard model
with one additional orbital and long-range Coulomb repulsion. We predict a
cascade of phase transitions tuned by the twist angle $\theta$. At the hole
filling factor $\nu=1$ (one hole per moir\'e unit cell), the ground state can
be in the multiferroic phase with coexisting spontaneous layer polarization and
magnetism, the quantum anomalous Hall phase, and finally the topologically
trivial magnetic phases, as $\theta$ increases from $1.5^{\circ}$ to
$5^{\circ}$. At $\nu=2$, the ground state can have a second-order phase
transition between an antiferromagnetic phase and the quantum spin Hall phase
as $\theta$ passes through a critical value. The dependence of the phase
boundaries on model parameters such as the gate-to-sample distance, the
dielectric constant, and the moir\'e potential amplitude is examined. The
predicted phase diagrams can guide the search for topological phases in twisted
transition metal dichalcogenide homobilayers.
This letter reports a highly scaled 90 nm gate length beta-Ga2O3 T-gate
MOSFET with no current collapse and record power gain cut off frequency (fMAX).
The epitaxial stack of 60 nm thin channel MOSFET was grown by Molecular Beam
Epitaxy (MBE) and highly doped (n++) contact regrowth was carried out by Metal
Organic Chemical Vapour Deposition (MOCVD) in the source/drain region. Maximum
on current (IDS, MAX) of 160 mA/mm and transconductance (gm) around 36 mS/mm
was measured at VDS= 10 V for LSD= 1.5 micrometer channel length.
Transconductance is limited by higher channel sheet resistance (Rsheet). We
observed no current collapse for both drain and gate lag measurement even at
higher VDG,Q quiescent bias points. This is the first report of Ga2O3 FET
showing no current collapse without any external passivation. Breakdown voltage
around 125 V was reported for LGD= 1.2 micrometer. We extracted 27 GHz current
gain cut off frequency (fT) and 55 GHz fMAX for 20 V drain bias. fMAX value
mentioned here is the highest for Ga2O3 and the first demonstration of 55 GHz
operation. fT. VBR product of 3.375 THz.V has been calculated which is
comparable with state-of-art GaN HEMT. This letter suggests that Ga2O3 can be a
suitable candidate for X-band application.
Over the last decade, substantial progress has been made in understanding the
topology of quasi-2D non-equilibrium fluid flows driven by ATP-powered
microtubules and microorganisms. By contrast, the topology of 3D active fluid
flows still poses interesting open questions. Here, we study the topology of a
spherically confined active flow using 3D direct numerical simulations of
generalized Navier-Stokes (GNS) equations at the scale of typical microfluidic
experiments. Consistent with earlier results for unbounded periodic domains,
our simulations confirm the formation of Beltrami-like bulk flows with
spontaneously broken chiral symmetry in this model. Furthermore, by leveraging
fast methods to compute linking numbers, we explicitly connect this chiral
symmetry breaking to the entanglement statistics of vortex lines. We observe
that the mean of linking number distribution converges to the global helicity,
consistent with the asymptotic result by Arnold. Additionally, we characterize
the rate of convergence of this measure with respect to the number and length
of observed vortex lines, and examine higher moments of the distribution. We
find that the full distribution is well described by a k-Gamma distribution, in
agreement with an entropic argument. Beyond active suspensions, the tools for
the topological characterization of 3D vector fields developed here are
applicable to any solenoidal field whose curl is tangent to or cancels at the
boundaries in a simply connected domain.
We investigate the Casimir-Lifshitz force (CLF) between two identical
graphene strip gratings, laid on finite dielectric substrates, by using the
scattering matrix (S-matrix) approach derived from the Fourier Modal Method
with Local Basis Functions (FMM-LBF). We fully take into account the high-order
electromagnetic diffractions, the multiple scattering and the exact 2D feature
of the graphene strips. We show that the non-additivity, which is one of the
most interesting features of the CLF in general, is significantly high and can
be modulated in situ, without any change in the actual material geometry and
this by varying the graphene chemical potential. We discuss the nature of the
geometrical effects and show the relevance of the geometric parameter d/D (i.e.
the ratio between separation and grating period), which allows to explore the
regions of parameters where the additive result is fully acceptable or where
the full calculation is needed. This study can open to deeper experimental
exploration of the non-additive features of the CLF with micro- or
nano-electromechanical graphene-based systems.
Volkov-Pankratov surface bands arise in smooth topological interfaces, i.e.
interfaces between a topological and a trivial insulator, in addition to the
chiral surface state imposed by the bulk-surface correspondence of topological
materials. These two-dimensional bands become Landau-quantized if a magnetic
field is applied perpendicular to the interface. I show that the energy scales,
which are typically in the 10-100 meV range, can be controlled both by the
perpendicular magnetic field and the interface width. The latter can still be
varied with the help of a magnetic-field component in the interface. The Landau
levels of the different Volkov-Pankratov bands are optically coupled, and their
arrangement may allow one to obtain population inversion by resonant optical
pumping. This could serve as the elementary brick of a multi-level laser based
on Landau levels. Moreover, the photons are absorbed and emitted either
parallel or perpendicular to the magnetic field, respectively in the Voigt and
Faraday geometry, depending on the Volkov-Pankratov bands and Landau levels
involved in the optical transitions.
Non-Hermitian quasicrystal constitutes a unique class of disordered open
system with PT-symmetry breaking, localization and topological triple phase
transitions. In this work, we uncover the effect of quantum correlation on
phase transitions and entanglement dynamics in non-Hermitian quasicrystals.
Focusing on two interacting bosons in a Bose-Hubbard lattice with
quasiperiodically modulated gain and loss, we find that the onsite interaction
between bosons could drag the PT and localization transition thresholds towards
weaker disorder regions compared with the noninteracting case. Moreover, the
interaction facilitates the expansion of the critical point of a triple phase
transition in the noninteracting system into a critical phase with mobility
edges, whose domain could be flexibly controlled by tuning the interaction
strength. Systematic analyses of the spectrum, inverse participation ratio,
topological winding number, wavepacket dynamics and entanglement entropy lead
to consistent predictions about the correlation-driven phases and transitions
in our system. Our findings pave the way for further studies of the interplay
between disorder and interaction in non-Hermitian quantum matter.
Frustration in magnetic materials arising from competing exchange
interactions can prevent the system from adopting long-range magnetic order and
can instead lead to a diverse range of novel quantum and topological states
with exotic quasiparticle excitations. Here, we review prominent examples of
such emergent phenomena, including magnetically-disordered and extensively
degenerate spin ices, which feature emergent magnetic monopole excitations,
highly-entangled quantum spin liquids with fractional spinon excitations,
topological order and emergent gauge fields, as well as complex particle-like
topological spin textures known as skyrmions. We provide an overview of recent
advances in the search for magnetically-disordered candidate materials on the
three-dimensional pyrochlore lattice and two-dimensional triangular, kagome and
honeycomb lattices, the latter with bond-dependent Kitaev interactions, and on
lattices supporting topological magnetism. We highlight experimental signatures
of these often elusive phenomena and single out the most suitable experimental
techniques that can be used to detect them. Our review also aims at providing a
comprehensive guide for designing and investigating novel frustrated magnetic
materials, with the potential of addressing some important open questions in
contemporary condensed matter physics.
The Kitaev model on a honeycomb lattice may provide a robust topological
quantum memory platform, but finding a material that realizes the unique spin
liquid phase remains a considerable challenge. We demonstrate that an effective
Kitaev Hamiltonian can arise from a half-filled Fermi-Hubbard Hamiltonian where
each site can experience a magnetic field in a different direction. As such, we
provide a method for realizing the Kitaev spin liquid on a single hexagonal
plaquette made up of twelve quantum dots. Despite the small system size, there
are clear signatures of the Kitaev spin-liquid ground state, and there is a
range of parameters where these signatures are predicted, allowing a potential
platform where Kitaev spin-liquid physics can be explored experimentally in
quantum dot plaquettes.
The complete characterization of a generic $d$-dimensional Floquet
topological phase is usually hard for the requirement of information about the
micromotion throughout the entire driving period. In a recent work [L. Zhang et
al., Phys. Rev. Lett. 125, 183001 (2020)], an experimentally feasible dynamical
detection scheme was proposed to characterize the integer Floquet topological
phases using quantum quenches. However, this theory is still far away from
completion, especially for free-fermion Floquet topological phases, where the
states can also be characterized by $Z_{2}$ invariants. Here we develop the
first full and unified dynamical characterization theory for the $Z_{2}$
Floquet topological phases of different dimensionality and tenfold-way symmetry
classes by quenching the system from a trivial and static initial state to the
Floquet topological regime through suddenly changing the parameters and turning
on the periodic driving. By measuring the minimal information of Floquet bands
via the stroboscopic time-averaged spin polarizations, we show that the
topological spin texture patterns emerging on certain discrete momenta of
Brillouin zone called the $0$ or $\pi$ gap highest-order band-inversion
surfaces provide a measurable dynamical $Z_{2}$ Floquet invariant, which
uniquely determines the Floquet boundary modes in the corresponding quasienergy
gap and characterizes the $Z_{2}$ Floquet topology. The applications of our
theory are illustrated via one- and two-dimensional models that are accessible
in current quantum simulation experiments. Our work provides a highly feasible
way to detect the $Z_{2}$ Floquet topology and completes the dynamical
characterization for the full tenfold classes of Floquet topological phases,
which shall advance the research in theory and experiments.
Controlling excitons at the nanoscale in semiconductor materials represents a
formidable challenge in the fields of quantum photonics and optoelectronics.
Achieving this control holds great potential for unlocking strong
exciton-exciton interaction regimes, enabling exciton-based logic operations,
exploring exotic quantum phases of matter, facilitating deterministic
positioning and tuning of quantum emitters, and designing advanced
optoelectronic devices. Monolayers of transition metal dichalcogenides (TMDs)
offer inherent two-dimensional confinement and possess significant binding
energies, making them particularly promising candidates for achieving
electric-field-based confinement of excitons without dissociation. While
previous exciton engineering strategies have predominantly focused on local
strain gradients, the recent emergence of electrically confined states in TMDs
has paved the way for novel approaches. Exploiting the valley degree of freedom
associated with these confined states further broadens the prospects for
exciton engineering. Here, we show electric control of light polarization
emitted from one-dimensional (1D) quantum confined states in MoSe2. By
employing non-uniform in-plane electric fields, we demonstrate the in-situ
tuning of the trapping potential and reveal how gate-tunable
valley-hybridization gives rise to linearly polarized emission from these
localized states. Remarkably, the polarization of the localized states can be
entirely engineered through either the spatial geometry of the 1D confinement
potential or the application of an out-of-plane magnetic field.

Date of feed: Thu, 16 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) **Qubit fractionalization and emergent Majorana liquid in the honeycomb Floquet code induced by coherent errors and weak measurements. (arXiv:2311.08450v1 [quant-ph])**

Guo-Yi Zhu, Simon Trebst

**From chiral spin liquids to skyrmion fluids and crystals, and their interplay with itinerant electrons. (arXiv:2311.08468v1 [cond-mat.stat-mech])**

F. A. Gómez Albarracín, H. D. Rosales, Masafumi Udagawa, P. Pujol, Ludovic D. C Jaubert

**Strongly pinned skyrmionic bubbles and higher-order nonlinear Hall resistances at the interface of Pt/FeSi bilayer. (arXiv:2311.08730v1 [cond-mat.str-el])**

T. Hori, N. Kanazawa, K. Matsuura, H. Ishizuka, K. Fujiwara, A. Tsukazaki, M. Ichikawa, M. Kawasaki, F. Kagawa, M. Hirayama, Y. Tokura

**Realization of corner and helical edge states in topologically trivial band gap by twig edge. (arXiv:2311.08733v1 [cond-mat.mes-hall])**

Jianfei Li, Ying Wang, Zhongxiang Zhou, Jingfeng Yao, Zhihao Lan, Chengxun Yuan

**Topological Domain-Wall States Hosting Quantized Polarization and Majorana Zero Modes Without Bulk Boundary Correspondence. (arXiv:2311.08771v1 [cond-mat.mes-hall])**

Sang-Hoon Han, Myungjun Kang, Moon Jip Park, Sangmo Cheon

**Strength-dependent Transition of Graphite Under Shock Condition Resolved by First Principles. (arXiv:2311.08805v1 [cond-mat.mtrl-sci])**

Gu-Wen Chen, Liang Xu, Yao-Ming Li, Zhi-Pan Liu, Sheng-Cai Zhu

**A high-efficiency programmable modulator for extreme ultraviolet light with nm feature size based on an electronic phase transition. (arXiv:2311.08809v1 [physics.optics])**

Igor Vaskivskyi, Anze Mraz, Rok Venturini, Gregor Jecl, Yevhenii Vaskivskyi, Riccardo Mincigrucci, Laura Foglia, Dario De Angelis, Jacopo-Stefano Pelli-Cresi, Ettore Paltanin, Danny Fainozzi, Filippo Bencivenga, Claudio Masciovecchio, Dragan Mihailovic

**The Anatomy of a Topological Phase Transition in a 2D Chern Insulator. (arXiv:2311.08932v1 [cond-mat.mes-hall])**

Arjo Dasgupta, Indra Dasgupta

**Klein tunneling degradation and enhanced Fabry-P\'erot interference in graphene/h-BN moir\'e-superlattice devices. (arXiv:2311.08938v1 [cond-mat.mes-hall])**

Viet-Anh Tran, Viet-Hung Nguyen, Jean-Christophe Charlier

**Tailoring the defects and electronic band structure in WS2/h-BN heterostructure. (arXiv:2311.08948v1 [cond-mat.mes-hall])**

Suvodeep Paul, Saheb Karak, Saswata Talukdar, Devesh Negi, Surajit Saha

**Hall-effect in the MnBi_2Te_4 crystal using silicon nitride nanomembrane via contacts. (arXiv:2311.08953v1 [cond-mat.mtrl-sci])**

Mickey Martini, Tommaso Confalone, Yejin Lee, Bastian Rubrecht, Giuseppe Serpico, Sanaz Shokri, Christian N. Saggau, Domenico Montemurro, Valerii M. Vinokur, Anna Isaeva, Kornelius Nielsch, Nicola Poccia

**Transport theory in non-Hermitian systems. (arXiv:2311.08973v1 [cond-mat.mes-hall])**

Qing Yan, Hailong Li, Qing-Feng Sun, X. C. Xie

**Transport properties of strongly correlated Fermi systems. (arXiv:2311.08974v1 [cond-mat.str-el])**

V.R. Shaginyan, A.Z. Msezane, M.V. Zverev

**Thickness dependent mechanical properties of soft ferromagnetic two-dimensional CoTe2. (arXiv:2311.08994v1 [cond-mat.mtrl-sci])**

Surbhi Slathia, Cencen Wei, Manoj Tripathi, Raphael Tromer, Solomon Demiss Negedu, Conor Boland, Suman Sarkar, Douglas S. Galvao, Alan Dalton, Chandra Sekhar Tiwary

**Josephson Diode Effect in Topological Superconductor. (arXiv:2311.09009v1 [cond-mat.supr-con])**

Zhaochen Liu, Linghao Huang, Jing Wang

**Metal-free Stoner and Mott-Hubbard magnetism in 2D polymers with honeycomb lattice. (arXiv:2311.09026v1 [cond-mat.str-el])**

Hongde Yu, Thomas Heine

**Electronic structure in a transition metal dipnictide TaAs2. (arXiv:2311.09055v1 [cond-mat.mes-hall])**

Sabin Regmi, Cheng-Yi Huang, Mojammel A. Khan, Baokai Wang, Anup Pradhan Sakhya, M. Mofazzel Hosen, Jesse Thompson, Bahadur Singh, Jonathan D. Denlinger, Masahiro Ishigami, J.F. Mitchell, Dariusz Kaczorowski, Arun Bansil, Madhab Neupane

**Ultrathick MA$_2$N$_4$(M'N) Intercalated Monolayers with Sublayer-Protected Fermi Surface Conduction States: Interconnect and Metal Contact Applications. (arXiv:2311.09057v1 [cond-mat.mtrl-sci])**

Che Chen Tho, Xukun Feng, Zhuoling Jiang, Liemao Cao, Chit Siong Lau, San-Dong Guo, Yee Sin Ang

**Single pair of charge-two high-fold fermions in ultralight chiral crystals. (arXiv:2311.09070v1 [cond-mat.mtrl-sci])**

Xiaoliang Xiao, Yuanjun Jin, Da-Shuai Ma, Haoran Wei, Jing Fan, Rui Wang, Xiaozhi Wu

**Broad-Wavevector Spin Pumping of Flat-Band Magnons. (arXiv:2311.09098v1 [cond-mat.mes-hall])**

Jinlong Wang, Hanchen Wang, Jilei Chen, William Legrand, Peng Chen, Lutong Sheng, Jihao Xia, Guibin Lan, Yuelin Zhang, Rundong Yuan, Jing Dong, Xiufeng Han, Jean-Philippe Ansermet, Haiming Yu

**Stability of topologically protected slow light against disorder. (arXiv:2311.09220v1 [physics.optics])**

Jonas F. Karcher, Sarang Gopalakrishnan, Mikael C. Rechtsman

**Monolayer Kagome Metals AV$_3$Sb$_5$. (arXiv:2202.11521v2 [cond-mat.str-el] UPDATED)**

Sun-Woo Kim, Hanbit Oh, Eun-Gook Moon, Youngkuk Kim

**Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene. (arXiv:2204.08087v2 [cond-mat.mes-hall] UPDATED)**

Sun-Woo Kim, Sunam Jeon, Moon Jip Park, Youngkuk Kim

**Advances in honeycomb layered oxides: Part I -- Syntheses and Characterisations of Pnictogen- and Chalcogen-Based Honeycomb Layered Oxides. (arXiv:2207.06499v4 [cond-mat.mtrl-sci] UPDATED)**

Godwill Mbiti Kanyolo, Titus Masese, Abbas Alshehabi, Zhen-Dong Huang

**Light-driven C-H bond activation mediated by 2D transition metal dichalcogenides. (arXiv:2208.07902v2 [cond-mat.mtrl-sci] UPDATED)**

Jingang Li, Di Zhang, Zhongyuan Guo, Xi Jiang, Jonathan M. Larson, Haoyue Zhu, Tianyi Zhang, Yuqian Gu, Brian Blankenship, Min Chen, Zilong Wu, Suichu Huang, Robert Kostecki, Andrew M. Minor, Costas P. Grigoropoulos, Deji Akinwande, Mauricio Terrones, Joan M. Redwing, Hao Li, Yuebing Zheng

**Interaction-driven topological phase diagram of twisted bilayer MoTe$_2$. (arXiv:2305.01006v3 [cond-mat.mes-hall] UPDATED)**

Wen-Xuan Qiu, Bohao Li, Xun-Jiang Luo, Fengcheng Wu

**Sub-100 nm {\beta}-Ga2O3 MOSFET with 55 GHz fMAX and >100 V breakdown. (arXiv:2305.04725v2 [cond-mat.mtrl-sci] UPDATED)**

Chinmoy Nath Saha, Abhishek Vaidya, A F M Anhar Uddin Bhuiyan, Lingyu Meng, Hongping Zhao, Uttam Singisetti

**Vortex line entanglement in active Beltrami flows. (arXiv:2306.01062v2 [physics.flu-dyn] UPDATED)**

Nicolas Romeo, Jonasz Slomka, Jorn Dunkel, Keaton J. Burns

**Tunable non-additivity in Casimir-Lifshitz force between graphene gratings. (arXiv:2306.17640v2 [cond-mat.mes-hall] UPDATED)**

Youssef Jeyar, Minggang Luo, Kevin Austry, Brahim Guizal, Yi Zheng, H. B. Chan, Mauro Antezza

**Topological interface states -- a possible path towards a Landau-level laser in the THz regime. (arXiv:2307.05116v3 [cond-mat.mes-hall] UPDATED)**

Mark O. Goerbig

**Correlation-induced phase transitions and mobility edges in an interacting non-Hermitian quasicrystal. (arXiv:2310.01275v2 [quant-ph] UPDATED)**

Tian Qian, Yongjian Gu, Longwen Zhou

**Experimental signatures of quantum and topological states in frustrated magnetism. (arXiv:2310.15071v2 [cond-mat.str-el] UPDATED)**

J. Khatua, B. Sana, A. Zorko, M. Gomilšek, K. Sethupathi M. S. Ramachandra Rao, M. Baenitz, B. Schmidt, P. Khuntia

**Engineering the Kitaev spin liquid in a quantum dot system. (arXiv:2310.18393v2 [cond-mat.mes-hall] UPDATED)**

Tessa Cookmeyer, Sankar Das Sarma

**Dynamical characterization of $Z_{2}$ Floquet topological phases via quantum quenches. (arXiv:2311.00114v2 [cond-mat.quant-gas] UPDATED)**

Lin Zhang

**Valley-hybridized gate-tunable 1D exciton confinement in MoSe2. (arXiv:2311.05299v2 [cond-mat.mes-hall] UPDATED)**

Maximilian Heithoff, Álvaro Moreno, Iacopo Torre, Matthew S. G. Feuer, Carola M. Purser, Gian Marcello Andolina, Giuseppe Calajo, Kenji Watanabe, Takashi Taniguchi, Dhiren Kara, Patrick Hays, Sefaattin Tongay, Vladimir Falko, Darrick Chang, Mete Atatüre, Antoine Reserbat-Plantey, Frank Koppens

Found 8 papers in prb The cubic perovskite ${\text{SrFeO}}_{\text{3}}$ was recently reported to host hedgehog- and skyrmion-lattice phases in a highly symmetric crystal structure which does not support the Dzyaloshinskii-Moriya interactions commonly invoked to explain such magnetic order. Hints of a complex magnetic phas… We investigate a long-ranged coupled and non-Hermitian two-dimensional array of nanomagnets, fabricated on a thin magnetic substrate and subjected to an in-plane magnetic field. We predict topology-driven edge and corner skin effects of magnetic eigenmodes with the localization position at boundarie… Topological insulators and superconductors have recently attracted considerable attention, and many different theoretical tools have been used to gain insight into their properties. Here we investigate how perturbations can spread through exemplary one-dimensional topological insulators and supercon… The recent discovery of strong spin Hall effects (SHEs) in two-dimensional layered topological semimetals has attracted intensive attention due to their exotic electronic properties and potential applications in spintronic devices. In this paper, we systematically study the topological properties an… We studied the topological features in Kondo insulator $\mathrm{Sm}{\mathrm{B}}_{6}$ by point-contact Andreev reflection spectroscopy with a Nb probe tip. Below the superconducting transition of Nb, the spectra exhibited a narrow dip at around zero bias superposed on a broad asymmetric background ca… We present analytic expressions for the density of states and its consistent derivation for the two-dimensional Qi-Wu-Zhang (QWZ) Hamiltonian—a generic model for the Chern topological insulators of class A. This density of states is expressed in terms of elliptical integrals. We discuss and plot spe… Excitons in van der Waals heterostructures having interlayer or intralayer types are responsible for their optical absorption properties. Here, we systematically investigate the band alignment and excitons in the ${\mathrm{MoSi}}_{2}{\mathrm{N}}_{4}/{\mathrm{WSi}}_{2}{\mathrm{N}}_{4}$ heterostructur… ${\mathrm{GdTe}}_{3}$, a van der Waals–type antiferromagnetic (AFM) metal with high mobility, is gaining a lot of attention for its potential use in high-speed spintronic devices as well as for fundamental physics research. Due to the magnetocrystalline anisotropy of ${\mathrm{GdTe}}_{3}$, exotic ef…

Date of feed: Thu, 16 Nov 2023 04:17:16 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) **Rich magnetic phase diagram of putative helimagnet ${\text{Sr}}_{3}{\text{Fe}}_{2}{\text{O}}_{7}$**

Nikita D. Andriushin, Justus Grumbach, Jung-Hwa Kim, Manfred Reehuis, Yuliia V. Tymoshenko, Yevhen A. Onykiienko, Anil Jain, W. Andrew MacFarlane, Andrey Maljuk, Sergey Granovsky, Andreas Hoser, Vladimir Pomjakushin, Jacques Ollivier, Mathias Doerr, Bernhard Keimer, Dmytro S. Inosov, and Darren C. Peets

Author(s): Nikita D. Andriushin, Justus Grumbach, Jung-Hwa Kim, Manfred Reehuis, Yuliia V. Tymoshenko, Yevhen A. Onykiienko, Anil Jain, W. Andrew MacFarlane, Andrey Maljuk, Sergey Granovsky, Andreas Hoser, Vladimir Pomjakushin, Jacques Ollivier, Mathias Doerr, Bernhard Keimer, Dmytro S. Inosov, and Darren C. Peets

[Phys. Rev. B 108, 174420] Published Wed Nov 15, 2023

**Edge and corner skin effects of chirally coupled magnons characterized by a topological winding tuple**

Chengyuan Cai, Dante M. Kennes, Michael A. Sentef, and Tao Yu

Author(s): Chengyuan Cai, Dante M. Kennes, Michael A. Sentef, and Tao Yu

[Phys. Rev. B 108, 174421] Published Wed Nov 15, 2023

**Information trapping by topologically protected edge states: Scrambling and the butterfly velocity**

Martyna Sedlmayr, Hadi Cheraghi, and Nicholas Sedlmayr

Author(s): Martyna Sedlmayr, Hadi Cheraghi, and Nicholas Sedlmayr

[Phys. Rev. B 108, 184303] Published Wed Nov 15, 2023

**Layer number dependent spin Hall effects in transition metal monocarbides ${M}_{2}\mathrm{C} (M=\mathrm{V},\mathrm{Nb},\mathrm{Ta})$**

Xi Zuo, Yulin Feng, Na Liu, Bing Huang, Meifeng Liu, Desheng Liu, and Bin Cui

Author(s): Xi Zuo, Yulin Feng, Na Liu, Bing Huang, Meifeng Liu, Desheng Liu, and Bin Cui

[Phys. Rev. B 108, 195129] Published Wed Nov 15, 2023

**Kondo breakdown in the topological Kondo insulator $\mathrm{Sm}{\mathrm{B}}_{6}$ studied by point-contact Andreev reflection spectroscopy**

Masanobu Shiga, Tsubasa Teramoto, Takurou Harada, Takuya Takahashi, Fumitoshi Iga, and Tatsuya Kawae

Author(s): Masanobu Shiga, Tsubasa Teramoto, Takurou Harada, Takuya Takahashi, Fumitoshi Iga, and Tatsuya Kawae

[Phys. Rev. B 108, 195130] Published Wed Nov 15, 2023

**Analytic density of states of a tight-binding model for a two-dimensional Chern insulator**

Vera Uzunova and Krzysztof Byczuk

Author(s): Vera Uzunova and Krzysztof Byczuk

[Phys. Rev. B 108, 195131] Published Wed Nov 15, 2023

**Exciton spectra and layer decomposition in ${\mathrm{MoSi}}_{2}{\mathrm{N}}_{4}/{\mathrm{WSi}}_{2}{\mathrm{N}}_{4}$ heterostructures**

Hongxia Zhong, Shiyuan Gao, Guangyong Zhang, Zhengyu Xu, Jianmeng Zhou, Xingbing Li, Cheng Lu, and Yunhua Wang

Author(s): Hongxia Zhong, Shiyuan Gao, Guangyong Zhang, Zhengyu Xu, Jianmeng Zhou, Xingbing Li, Cheng Lu, and Yunhua Wang

[Phys. Rev. B 108, 205131] Published Wed Nov 15, 2023

**Magnetic field induced Weyl state in the van der Waals–type antiferromagnet ${\mathrm{GdTe}}_{3}$**

Y. M. Wan, E.-J. Cheng, H.-Y. Ma, X. F. Yang, X. F. Hou, X. J. Chen, X. Zhang, C. Y. Xi, Z. C. Zhong, J. P. Liu, Y. F. Guo, and S. Y. Li

Author(s): Y. M. Wan, E.-J. Cheng, H.-Y. Ma, X. F. Yang, X. F. Hou, X. J. Chen, X. Zhang, C. Y. Xi, Z. C. Zhong, J. P. Liu, Y. F. Guo, and S. Y. Li

[Phys. Rev. B 108, 205132] Published Wed Nov 15, 2023

Found 3 papers in prl A phase diagram of gold is proposed in the [0; 1000] GPa and [0; 10 000] K ranges of pressure and temperature, respectively, topologically modified with respect to previous predictions. Using finite-temperature Despite its simple crystal structure, layered boron nitride features a surprisingly complex variety of phonon-assisted luminescence peaks. We present a combined experimental and theoretical study on ultraviolet-light emission in hexagonal and rhombohedral bulk boron nitride crystals. Emission spectr… Recent studies of non-Hermitian periodic lattices unveiled the non-Hermitian skin effect (NHSE), in which the bulk modes under the periodic boundary conditions (PBC) become skin modes under open boundary conditions. The NHSE is a topological effect owing to the nontrivial spectral winding, and such …

Date of feed: Thu, 16 Nov 2023 04:17:18 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) *Ab Initio* Phase Diagram of Gold in Extreme Conditions

P. Richard, A. Castellano, R. Béjaud, L. Baguet, J. Bouchet, G. Geneste, and F. Bottin

Author(s): P. Richard, A. Castellano, R. Béjaud, L. Baguet, J. Bouchet, G. Geneste, and F. Bottin*ab initio* simulations and nonequilibirum thermodynamic integration, both accelerated by m…

[Phys. Rev. Lett. 131, 206101] Published Wed Nov 15, 2023

**Distinguishing Different Stackings in Layered Materials via Luminescence Spectroscopy**

Matteo Zanfrognini, Alexandre Plaud, Ingrid Stenger, Frédéric Fossard, Lorenzo Sponza, Léonard Schué, Fulvio Paleari, Elisa Molinari, Daniele Varsano, Ludger Wirtz, François Ducastelle, Annick Loiseau, and Julien Barjon

Author(s): Matteo Zanfrognini, Alexandre Plaud, Ingrid Stenger, Frédéric Fossard, Lorenzo Sponza, Léonard Schué, Fulvio Paleari, Elisa Molinari, Daniele Varsano, Ludger Wirtz, François Ducastelle, Annick Loiseau, and Julien Barjon

[Phys. Rev. Lett. 131, 206902] Published Wed Nov 15, 2023

**Experimental Realization of Geometry-Dependent Skin Effect in a Reciprocal Two-Dimensional Lattice**

Wei Wang, Mengying Hu, Xulong Wang, Guancong Ma, and Kun Ding

Author(s): Wei Wang, Mengying Hu, Xulong Wang, Guancong Ma, and Kun Ding

[Phys. Rev. Lett. 131, 207201] Published Wed Nov 15, 2023

Found 1 papers in comm-phys Communications Physics, Published online: 14 November 2023; doi:10.1038/s42005-023-01444-1**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) **An atomically tailored chiral magnet with small skyrmions at room temperature**

Roland K. Kawakami