Found 31 papers in cond-mat Das, Das, and Mandal (PRL 131, 056202, 2023) examine a wavefunction for nu =
5/2 on a sphere including moderate Landau-Level mixing evaluated
perturbatively. The wavefunction they find is not a fractional quantum Hall
(FQH) state as claimed, but rather shows phase separation or bubble/stripe
formation.
We study the scaling of the entanglement entropy in different classes of
one-dimensional fermionic quasiperiodic systems with and without pairing,
focusing on multifractal critical points/phases. We find that the entanglement
entropy scales logarithmically with the subsystem size $N_{A}$ with a
proportionality coefficient $\mathcal{C}$, as in homogeneous critical points,
apart from possible additional small oscillations. In the absence of pairing,
we find that the entanglement entropy coefficient $\mathcal{C}$ is
non-universal and depends significantly and non-trivially both on the model
parameters and electron filling, in multifractal critical points. In some of
these points, $\mathcal{C}$ can take values close to the homogeneous (or
ballistic) system, although it typically takes smaller values. We find a close
relation between the behaviour of the entanglement entropy and the small-$q$
(long-wavelength) dependence of the momentum structure factor $\mathcal{S}(q)$.
$\mathcal{S}(q)$ increases linearly with q as in the homogeneous case, with a
slope that grows with $\mathcal{C}$. In the presence of pairing, we find that
even the addition of small anomalous terms affects very significantly the
scaling of the entanglement entropy compared to the unpaired case. In
particular, we focused on topological phase transitions for which the gap
closes with either extended or critical multifractal states. In the former
case, the scaling of the entanglement entropy mirrors the behaviour observed at
the critical points of the homogeneous Kitaev chain, while in the latter, it
shows only slight deviations arising at small length scales. In contrast with
the unpaired case, we always observe $\mathcal{C}\approx1/6$ for different
critical points, the known value for the homogeneous Kitaev chain with periodic
boundary conditions.
Estimating expectation values is a key subroutine in many quantum algorithms.
However, near-term implementations face two major challenges: a limited number
of samples to learn a large collection of observables, and the accumulation of
errors in devices without quantum error correction. To address these challenges
simultaneously, we develop a quantum error-mitigation strategy which unifies
the group-theoretic structure of classical-shadow tomography with symmetries in
quantum systems of interest. We refer to our protocol as "symmetry-adjusted
classical shadows," as it mitigates errors by adjusting estimators according to
how known symmetries are corrupted under those errors. As a concrete example,
we highlight global $\mathrm{U}(1)$ symmetry, which manifests in fermions as
particle number and in spins as total magnetization, and illustrate their
unification with respective classical-shadow protocols. One of our main results
establishes rigorous error and sampling bounds under readout errors obeying
minimal assumptions. Furthermore, to probe mitigation capabilities against a
more comprehensive class of gate-level errors, we perform numerical experiments
with a noise model derived from existing quantum processors. Our analytical and
numerical results reveal symmetry-adjusted classical shadows as a flexible and
low-cost strategy to mitigate errors from noisy quantum experiments in the
ubiquitous presence of symmetry.
High harmonic generation (HHG) is a powerful probe of electron dynamics on
attosecond to femtosecond timescales and has been successfully used to detect
electronic and structural changes in novel solid-state quantum materials,
including transition metal dichalcogenides (TMDs). Among TMDs, bulk NbSe$_2$
exhibits charge density wave (CDW) order below 33 K and becomes superconducting
below 7.3 K. Monolayer NbSe$_2$ is therefore interesting as a material whose
different structural and electronic properties could be probed via HHG. Here,
we predict the HHG response of the pristine 2H and CDW phases of monolayer
NbSe$_2$ using real-time time-dependent density functional theory under the
application of a simulated laser pulse excitation. We find that due to the lack
of inversion symmetry in both monolayer phases, it is possible to excite even
harmonics and that, importantly, the even harmonics appear strictly as the
transverse (Hall) components of the current response under excitations
polarized along the zigzag direction of the monolayer, while odd harmonics
arise from the longitudinal current response in all excitation directions. This
suggests that the even and odd harmonic response can be controlled via the
polarization of the probing field, opening a new avenue for potentially useful
applications in opto-electronic devices.
Hybrid systems of superconductors and magnets display several intriguing
properties, both from a fundamental physics point of view and with practical
applications. Promising applications in superconducting spintronics motivate a
search for systems where superconductivity can survive larger inplane critical
magnetic fields than the conventional limit. The Chandrasekhar-Clogston (CC)
limit applies to thin-film conventional superconductors with inplane magnetic
fields such that orbital effects may be ignored. For a magnetic field strength
comparable to the superconducting gap at zero temperature and zero field, a
spin-split normal state attains lower free energy than the superconducting
state. A multiband superconductor with a flat band placed just below the Fermi
surface has been shown to surpass the CC limit using weak-coupling theory.
Since the dimensionless coupling determining the critical temperature scales
with the density of states, it is natural to anticipate corrections from
strong-coupling theory in flat-band systems, owing to the large density of
states of the flat bands. We derive Eliashberg equations and the free energy
for a multiband superconductor in a magnetic field. First, we show that the CC
limit can be exceeded by a small amount in one-band strong-coupling
superconductors due to self-energy renormalization of the magnetic field. Next,
we consider a two-band system with one flat band and find that the CC limit can
be exceeded by a large amount also in strong-coupling theory, even when
including hybridization between bands that intersect.
Fluxons in a superconducting loop can be coherently coupled by quantum phase
slips occurring at a weak link such as a Josephson junction. If Cooper pair
tunneling at the junction occurs through a resonant level, $2\pi$ quantum phase
slips are suppressed, and fluxons are predominantly coupled by $4\pi$ quantum
phase slips. We analyze this scenario by computing the coupling between fluxons
as the level is brought into resonance with the superconducting condensate. The
results indicate that the $4\pi$-dominated regime can be observed directly in
the transition spectrum for circuit parameters typical of a fluxonium qubit. We
also show that, if the inductive energy of the loop is much smaller than the
plasma frequency of the junction, the low-energy Hamiltonian of the circuit is
dual to that of a topological superconducting island. These findings can inform
experiments on bifluxon qubits as well as the design of novel types of
protected qubits.
Layer number-dependent band structures and symmetry are vital for the
electrical and optical characteristics of two-dimensional (2D) transition metal
dichalcogenides (TMDCs). Harvesting 2D TMDCs with tunable thickness and
properties can be achieved through top-down etching and bottom-up growth
strategies. In this study, we report a pioneering technique that utilizes the
migration of in-situ generated Na-W-S-O droplets to etch out one-dimensional
(1D) nanotrenches in few-layer WS$_2$. 1D WS$_2$ nanotrenches were successfully
fabricated on the optically inert bilayer WS$_2$, showing pronounced
photoluminescence and second harmonic generation signals. Additionally, we
demonstrate the modulation of inkjet-printed Na$_2$WO$_4$-Na$_2$SO$_4$
particles to switch between the etching and growth modes by manipulating the
sulfur supply. This versatile approach enables the creation of 1D nanochannels
on 2D TMDCs. Our research presents exciting prospects for the top-down and
bottom-up fabrication of 1D-2D mixed-dimensional TMDC nanostructures, expanding
their use for photonic and optoelectronic applications.
The concepts of topology provide a powerful tool to tailor the propagation
and localization of light. While electromagnetic waves have only two
polarization states, engineered degeneracies of photonic modes provide novel
opportunities resembling orbital or spin degrees of freedom in condensed
matter. Here, we tailor such degeneracies for the array of femtosecond laser
written waveguides in the optical range exploiting the idea of photonic
molecules -- clusters of strongly coupled waveguides. In our experiments, we
observe the emergence of topological modes caused by the inter-orbital coupling
and track multiple topological transitions in the system with the change of the
lattice spacings and excitation wavelength. This strategy opens an avenue in
designing novel types of photonic topological phases and states.
The stability of magnetic skyrmions has been investigated in the past, but
mostly in the absence of thermal fluctuations. However, thermal spin
fluctuations modify the magnetic properties (exchange stiffness,
Dzyaloshinskii-Moriya interaction (DMI) and anisotropy) that define skyrmion
stability. Thermal magnons also excite internal skrymion dynamics, deforming
the skyrmion shape. Entropy has also been shown to modify skyrmion lifetimes in
experiments, but is absent or approximated in previous studies. Here we use
metadynamics to calculate the free energy surface of a magnetic thin film in
terms of the topological charge and magnetization. We identify the free energy
minima corresponding to different spin textures and the lowest energy paths
between the ferromagnetic and single skyrmion states. We show that at low
temperatures the lowest free energy barrier is a skyrmion collapse process.
However, this energy barrier increases with temperature. An alternative path,
where a singularity forms on the skrymion edge, has a larger free energy
barrier at low temperatures but decreases with increasing temperature and
eventually becomes the lowest energy barrier.
Chalcogenide perovskites, such as BaZrS$_3$, are emerging semiconductors with
potential for high photovoltaic power conversion efficiency. The role of
defects in the efficiency of the generation and collection of photo-excited
carriers has not been experimentally investigated extensively. We study the
effect of processing-induced defects on the photoconductive properties of
single crystals of BaZrS$_3$. We achieved ohmic contacts to single crystals of
BaZrS$_3$ and observed positive surface photovoltage, which is typically
observed in p-type semiconductors. However, mechanical polishing of BaZrS$_3$
to remove the surface oxide leads to dense deformation grain boundaries and
leads to trap-dominated photoconductive response. In comparison, ohmic contacts
achieved in cleaved crystals leave fewer deformation defects and greatly
improve optoelectronic properties. Defect-controlled crystal growth and contact
fabrication are potentially limiting factors for achieving high
photon-to-excited electron conversion efficiency in BaZrS$_3$.
The self-avoiding random walk (SARW) is a stochastic process whose state
variable avoids returning to previously visited states. This non-Markovian
feature has turned SARWs a powerful tool for modelling a plethora of relevant
aspects in network science, such as network navigability, robustness and
resilience. We analytically characterize self-avoiding random walkers that
evolve on complex networks and whose memory suffers stochastic resetting, that
is, at each step, with a certain probability, they forget their previous
trajectory and start free diffusion anew. Several out-of-equilibrium properties
are addressed, such as the time-dependent position of the walker, the
time-dependent degree distribution of the non-visited network and the
first-passage time distribution, and its moments, to target nodes. We examine
these metrics for different resetting parameters and network topologies, both
synthetic and empirical, and find a good agreement with simulations in all
cases. We also explore the role of resetting on network exploration and report
a non-monotonic behavior of the cover time: frequent memory resets induce a
global minimum in the cover time, significantly outperforming the well-known
case of the pure random walk, while reset events that are too spaced apart
become detrimental for the network discovery. Our results provide new insights
into the profound interplay between topology and dynamics in complex networks,
and shed light on the fundamental properties of SARWs in nontrivial
environments.
The planar Hall effect (PHE), the appearance of an in-plane transverse
voltage in the presence of coplanar electric and magnetic fields, has been
ascribed to the chiral anomaly and Berry curvature effects in Weyl semimetals.
In the presence of position- and time-dependent perturbations, such as strain,
Weyl semimetals react as if they would be subjected to emergent electromagnetic
fields, kwnon as pseudo-fields. In this paper we investigate the possibility of
inducing nonlinear phenomena, including the PHE, in strained Weyl semimetals.
Using the chiral kinetic theory in the presence of pseudo-fields, we derive
general expressions for the magnetoconductivity tensor by considering the
simultaneous effects of the Berry curvature and orbital magnetic moment of
carriers, which are indeed of the same order of magnitude. Since pseudo-fields
couple to the Weyl fermions of opposite chirality with opposite signs, we study
chirality-dependent phenomena, including the longitudinal magnetoconductivity
and the planar Hall effect. We discuss our results in terms of the chiral
anomaly with pseudo-fields. These may open new possibilities in
chiralitytronics.
We study the non-Hermitian (NH) Toda model coupled to fermions through
soliton theory techniques and the realizations of the pseudo-chiral and
pseudo-Hermitian symmetries. The interplay of non-Hermiticity, integrability,
nonlinearity, and topology significantly influence the formation and behavior
of a continuum of bound state modes (CBM) and extended waves in the localized
continuum (ELC). The non-Hermitian soliton-fermion duality, the complex scalar
field topological charges and winding numbers in the spectral topology are
uncovered. The Hermitian bound states/solitons lie on the unit circle $|z|=1$
defined by the uniformization parameter $z \in \IC \backslash \{0\}$ related to
the complex energy eigenvalue, whereas the non-Hermitian bound states/solitons
lie on the complex plane such that $|z| \neq 1$. The biorthogonal Majorana zero
modes, dual to the NH Toda solitons with topological charges $\pm 1$, appear at
the complex-energy point gap and are pinned at zero energy. Our findings
improve the understanding of exotic quantum states, but also paves the way for
future research in harnessing non-Hermitian phenomena for topological quantum
computation, as well as the exploration of integrability and NH solitons in the
theory of topological phases of matter.
We investigated the single-particle Anderson localization problem for
non-Hermitian systems on directed graphs. Various undirected standard random
graph models were modified by controlling reciprocity and hopping asymmetry
parameters. We found the emergence of left, biorthogonal and right localized
states depending on both parameters and graph structure properties such as node
degree $d$. For directed random graphs, the occurrence of biorthogonal
localization near exceptional points is described analytically and numerically.
The clustering of localized states near the center of the spectrum and the
corresponding mobility edge for left and right states are shown numerically.
Structural features responsible for localization, such as topologically
invariant nodes or drain and sources, were also described. Considering the
diagonal disorder, we observed the disappearance of localization dependence on
reciprocity around $W \sim 20$ for a random regular graph $d=4$. With a small
diagonal disorder, the average biorthogonal fractal dimension drastically
reduces. Around $W \sim 5$ localization scars occur within the spectrum,
alternating as vertical bands of clustering of left and right localized states.
Within the Landau-Ginzburg picture of phase transitions, scalar field
theories can undergo phase separation because of a spontaneous
symmetry-breaking mechanism that makes homogeneous field configurations
unstable. This picture works in thermodynamics but also in the dynamics of
phase separation. Here we show that scalar non-equilibrium field theories
undergo phase separation just because of non-equilibrium fluctuations driven by
a persistent noise. The mechanism is similar to what happens in
Motility-Induced Phase Separation where persistent motion introduces an
effective attractive force. In this work, we observe that Noise-Induced Phase
Separation occurs in a region of the phase diagram where disordered field
configurations would otherwise be stable at equilibrium. Moreover, looking at
the local entropy production rate, we find that the breaking of time-reversal
symmetry is concentrated on the boundary between the two phases.
Interstitial topological objects, such as skyrmions, within a natural 1-D
helix are predicted to be free from ambiguous 'skyrmion Hall effect'. The
helical ambience precipitate an additional potential that counteract the Magnus
force arising from the gyrotropic motion of skyrmion. Here, we present the
observation of $\pm$ $\frac{1}{2}$ topological charge objects (anti)merons
within the 1-D helical stripes in D$_{2d}$ symmetric
Mn$_{1.4}$Pt$_{0.9}$Pd$_{0.1}$Sn$_{1-x}$In$_{x}$ system. With the help of
Lorentz transmission electron microscopy study we demonstrate that the
pair-wise meron and antimeron chains can be spontaneously stabilized for a
critical In concentration in the system. The exchange frustration induced
proportionate fragmentation of the magnetic moment in the in-plane and
easy-axis directions acts as a basic ingredient for the formation of
(anti)merons within the helical stripe. A constrained drift motion of
(anti)merons along the stripe makes this system an ideal platform for the
realization of skyrmion Hall free track motion. Moreover, the observation of
(anti)merons in addition to the skyrmion and antiskyrmion in D$_{2d}$ materials
makes them a suitable horizon for zoo of topology.
Topological insulators have attracted great interest as generators of
spin-orbit torques (SOTs) in spintronic devices.
Bi\textsubscript{1-x}Sb\textsubscript{x} is a prominent topological insulator
that has a high charge-to-spin conversion efficiency. However, the origin and
magnitude of the SOTs induced by current-injection in
Bi\textsubscript{1-x}Sb\textsubscript{x} remain controversial. Here we report
the investigation of the SOTs and spin Hall magnetoresistance resulting from
charge-to-spin conversion in twin-free epitaxial layers of
Bi\textsubscript{0.9}Sb\textsubscript{0.1}(0001) coupled to FeCo, and compare
it with that of amorphous Bi\textsubscript{0.9}Sb\textsubscript{0.1}. We find a
large charge-to-spin conversion efficiency of 1 in the first case and less than
0.1 in the second, confirming crystalline
Bi\textsubscript{0.9}Sb\textsubscript{0.1} as a strong spin injector material.
The SOTs and spin Hall magnetoresistance are independent of the direction of
the electric current, indicating that charge-to-spin conversion in
single-crystal Bi\textsubscript{0.9}Sb\textsubscript{0.1}(0001) is isotropic
despite the strong anisotropy of the topological surface states. Further, we
find that the damping-like SOT has a non-monotonic temperature dependence with
a minimum at 20~K. By correlating the SOT with resistivity and weak
antilocalization measurements, we conclude that charge-spin conversion occurs
via thermally-excited holes from the bulk states above 20~K, and conduction
through the isotropic surface states with increasing spin polarization due to
decreasing electron-electron scattering below 20~K.
The possibility to engineer a Kitaev chain in quantum dots coupled via
superconductors has recently emerged as a promising path toward topological
superconductivity and possibly nonabelian physics. Here, we show that it is
possible to avoid some of the main experimental hurdles on this path by using
only local proximity effect on each quantum dot in a geometry that resembles a
two-dot version of the proposal in New J. Phys. 15 045020 (2013). There is no
need for narrow superconducting couplers, additional Andreev bound states, or
spatially varying magnetic fields; it suffices with spin-orbit interaction and
a constant magnetic field, in combination with control of the superconducting
phase to tune the relative strengths of elastic cotunneling and an effective
crossed-Andreev-reflection-like process generated by higher-order tunneling. We
use a realistic spinful, interacting model and show that high-quality Majorana
bound states can be generated already in a double quantum dot.
The progress in materials science has always been associated with the
development of functional materials systems, which enables us to design
proof-of-concept devices. To advance further, theoretical predictions of new
novel materials and their experimental realization is very important. This
chapter reviews the intriguing properties of rare earth-based materials and
their applications in spintronics. Spintronics is an emerging technology, which
exploits spin degree of freedom of an electron along with its charge property.
Discovery of various physical phenomena and their industrial applications in
the field of magnetic sensors, magnetic recording and non-volatile memories
such as magnetic random access memory (MRAM) and spin-transfer torque (STT)
MRAM opens several new directions in this field. Materials with large spin
polarization, strong spin-orbit coupling, and tunable electronic and magnetic
properties offer an excellent platform for the spintronics technology.
Combination of rare earths with other elements such as transition metals show
broad range of structural, electronic, and magnetic properties which make them
excellent candidates for various spintronic applications. This chapter
discusses many such materials ranging from Heusler alloys, topological
insulators to two-dimensional ferromagnets and their potential applications.
The review gives an insight of how rare-earth materials can play a key role in
emerging future technology and have great potential in many new spintronic
related applications.
We investigate the connection between localization of low-lying Dirac modes
and Polyakov-loop ordering in the lattice $\mathrm{SU}(2)$-Higgs model at
finite temperature, probed with static external staggered fermions. After
mapping out the phase diagram of the model at a fixed temporal extension in
lattice units, we study the localization properties of the low-lying modes of
the staggered Dirac operator, how these properties change across the various
transitions, and how these modes correlate with the gauge and Higgs fields. We
find localized low modes in the deconfined and in the Higgs phase, where the
Polyakov loop is strongly ordered, but in both cases they disappear as one
crosses over to the confined phase. Our findings confirm the general
expectations of the "sea/islands" picture, and the more detailed expectations
of its refined version concerning the favorable locations of localized modes,
also in the presence of dynamical scalar matter.
Kagome lattices represent an archetype of intriguing physics, attracting a
great deal of interest in different branches of natural sciences, recently in
the context of topological crystalline insulators. Here, we demonstrate two
distinct classes of corner states in breathing Kagome lattices (BKLs) with
"bearded" edge truncation, unveiling their topological origin. The in-phase
corner states are found to exist only in the topologically nontrivial regime,
characterized by a nonzero bulk polarization. In contrast, the out-of-phase
corner states appear in both topologically trivial and nontrivial regimes,
either as bound states in the continuum or as in-gap states depending on the
lattice dimerization conditions. Furthermore, the out-of-phase corner states
are highly localized, akin to flat-band compact localized states, and they
manifest both real- and momentum-space topology. Experimentally, we observe
both types of corner states in laser-written photonic bearded-edge BKLs,
corroborated by numerical simulations. Our results not only deepen the current
understanding of topological corner modes in BKLs, but also provide new insight
into their physical origins, which may be applied to other topological BKL
platforms beyond optics.
Long-range magnetic textures, such as magnetic skyrmion, give rise to rich
transport properties in magnetic metals, such as the anomalous Hall effect
related to spin chirality, a.k.a. topological Hall effect. In addition to the
topological Hall effect, recent studies on non-centrosymmetric magnets find
that the spin-orbit interaction of itinerant electrons gives rise to novel
contributions related to spin chirality, i.e., the chiral Hall effect. In this
work, we discuss that the spin-orbit interaction has a distinct, yet
significant, effect on the anomalous Hall effect related to spin chirality in
centrosymmetric magnets. Using a scattering theory method, we find that the
anomalous Hall effect related to scalar spin chirality in a two-dimensional
Luttinger model is suppressed by more than one order of magnitude compared to
the quadratic dispersion, and the contributions similar to the chiral Hall
effect in Rashba model vanishes. At the same time, a novel term that gives
different Hall conductivity for the Bloch and Neel skyrmions occurs, thereby
enabling the detection of the skyrmion helicity. The striking differences
demonstrate the rich effect of crystal symmetry on the chirality-related
anomalous Hall effect in materials with strong spin-orbit interaction.
The kagome lattice is very attractive as it can host many novel quantum
states, such as the charge density wave, superconductivity, quantum spin
liquid, etc. Meanwhile, iridates often exhibit a strong spin-orbit coupling
(SOC) effect due to the large atomic mass of 5$d$ elements, which has important
implications for both the energy bands and the pairing symmetry of
superconductors. For the Laves phase superconductor Sc$_2$Ir$_4$ with a kagome
lattice, by doping Si to the Ir sites, we observed a nonmonotonic and two-dome
like doping dependence of the superconducting transition temperature $T_{\rm
c}$, which is typically found in many unconventional superconducting systems.
Interestingly, for some samples, especially Sc$_2$Ir$_{3.5}$Si$_{0.5}$ with the
optimal $T_{\rm c}$, after the suppression of superconductivity, the
normal-state resistivity exhibits a semiconducting behavior; meanwhile, the
specific heat coefficient shows an upturn which follows the relation
$C/T\propto{\rm ln}(T_0/T)$ at low temperatures. Around the optimal doping, the
resistance measurements exhibit strong superconducting fluctuations. And the
superconductivity related specific heat can be fitted by the model of a
$d$-wave gap after subtracting the normal-state background. These strongly
suggest unconventional superconductivity and correlation effect in the samples,
which is mainly induced by a flat band near the Fermi level when considering
the SOC, as supported by the first-principles calculations. Our results reveal
a new unconventional superconducting system Sc$_2$Ir$_{4-x}$Si$_x$ with strong
correlation effects induced by the flat band in the kagome system with strong
SOC.
The physical scalar product between spin-networks has been shown to be a
fundamental tool in the theory of topological quantum neural networks (TQNN),
which are quantum neural networks previously introduced by the authors in the
context of quantum machine learning. However, the effective evaluation of the
scalar product remains a bottleneck for the applicability of the theory. We
introduce an algorithm for the evaluation of the physical scalar product
defined by Noui and Perez between spin-network with hexagonal shape. By means
of recoupling theory and the properties of the Haar integration we obtain an
efficient algorithm, and provide several proofs regarding the main steps. We
investigate the behavior of the TQNN evaluations on certain classes of
spin-networks with the classical and quantum recoupling. All results can be
independently reproduced through the ``idea.deploy"
framework~\href{https://github.com/lullimat/idea.deploy}{\nolinkurl{https://github.com/lullimat/idea.deploy}}
We investigate the quasi-particle and transport properties of a model
describing interacting Dirac and Weyl semimetals in the presence of local
Hubbard repulsion $U$, where we explicitly include a deviation from the
linearity of the energy-momentum dispersion through an intermediate-energy
scale $\Lambda$. Our focus lies on the correlated phase of the semimetal. At
the nodal point, the renormalization of spectral weight at a fixed temperature
$T$ exhibits a weak dependence on $\Lambda$ but is sensitive to the proximity
to the Mott transition. Conversely, the scattering rate of quasi-particles and
the resistivity display high-temperature exponents that crucially rely on
$\Lambda$, leading to a crossover towards a conventional Fermi-liquid behaviour
at finite T. Finally, by employing the Nernst-Einstein relation for
conductivity, we identify a corresponding density crossover as a function of
the chemical potential.
A Fermi gas of non-interacting electrons, or ultra-cold fermionic atoms, has
a quantum ground state defined by a region of occupancy in momentum space known
as the Fermi sea. The Euler characteristic $\chi_F$ of the Fermi sea serves to
topologically classify these gapless fermionic states. The topology of a $D$
dimensional Fermi sea is physically encoded in the $D+1$ point equal time
density correlation function. In this work, we first present a simple proof of
this fact by showing that the evaluation of the correlation function can be
formulated in terms of a triangulation of the Fermi sea with a collection of
points, links and triangles and their higher dimensional analogs. We then make
use of the topological $D+1$ point density correlation to reveal universal
structures of the more general $M$ point density correlation functions in a $D$
dimensional Fermi gas. Two experimental methods are proposed for observing
these correlations in $D=2$. In cold atomic gases imaged by quantum gas
microscopy, our analysis supports the feasibility of measuring the third order
density correlation, from which $\chi_F$ can be reliably extracted in systems
with as few as around 100 atoms. For solid-state electron gases, we propose
measuring correlations in the speckle pattern of intensity fluctuations in
nonlinear X-ray scattering experiments.
The intensive pursuit for quantum advantage in terms of computational
complexity has further led to a modernized crucial question: {\it When and how
will quantum computers outperform classical computers?} The next milestone is
undoubtedly the realization of quantum acceleration in practical problems. Here
we provide a clear evidence and arguments that the primary target is likely to
be condensed matter physics. Our primary contributions are summarized as
follows: 1) Proposal of systematic error/runtime analysis on state-of-the-art
classical algorithm based on tensor networks; 2) Dedicated and high-resolution
analysis on quantum resource performed at the level of executable logical
instructions; 3) Clarification of quantum-classical crosspoint for ground-state
simulation to be within runtime of hours using only a few hundreds of thousand
physical qubits for 2d Heisenberg and 2d Fermi-Hubbard models, assuming that
logical qubits are encoded via the surface code with the physical error rate of
$p=10^{-3}$. To our knowledge, we argue that condensed matter problems offer
the earliest platform for demonstration of practical quantum advantage that is
order-of-magnitude more feasible than ever known candidates, in terms of both
qubit counts and total runtime.
Clifford quantum circuits are elementary invertible transformations of
quantum systems that map Pauli operators to Pauli operators. We study periodic
one-parameter families of Clifford circuits, called loops of Clifford circuits,
acting on $\mathsf{d}$-dimensional lattices of prime $p$-dimensional qudits. We
propose to use the notion of algebraic homotopy to identify topologically
equivalent loops. We calculate homotopy classes of such loops for any odd $p$
and $\mathsf{d}=0,1,2,3$, and $4$. Our main tool is the Hermitian K-theory,
particularly a generalization of the Maslov index from symplectic geometry. We
observe that the homotopy classes of loops of Clifford circuits in
$(\mathsf{d}+1)$-dimensions coincide with the quotient of the group of Clifford
Quantum Cellular Automata modulo shallow circuits and lattice translations in
$\mathsf{d}$-dimensions.
The classical $J_1$-$J_2$ Ising model on the square lattice is a minimal
model of frustrated magnetism whose phase boundary is not yet completely
understood. The current consensus is that the phase transitions are continuous
when $J_2/|J_1|\gtrsim0.67$, while strong evidence is lacking for the order of
the transitions at $0<J_2/|J_1|\lesssim0.67$. We point out a loop hole in the
argument for the current consensus, and we find strong evidence that the phase
boundary is (mostly weak) first-order at $0.5<J_2/|J_1|<\infty$ such that it
asymptotically becomes second-order when $J_2/|J_1|\rightarrow\infty$. We also
find suggestive evidence that when $J_2/|J_1|\rightarrow0.5^+$, the phase
boundary becomes of a novel first-order type that is neither strong nor weak.
We establish these results by combining adiabatic evolution of tensor networks
directly in the thermodynamic limit with the theory of finite entanglement
scaling.
Due to their non-trivial topology, skyrmions describe deflected trajectories,
which hinders their straight propagation in nanotracks and can lead to their
annihilation at the track edges. This deflection is caused by a gyrotropic
force proportional to the topological charge and the angular momentum density
of the host film. In this article we present clear evidence of the reversal of
the topological deflection angle of skyrmions with the sign of angular momentum
density. We measured the skyrmion trajectories across the angular momentum
compensation temperature (TAC) in GdCo thin films, a rare earth/transition
metal ferrimagnetic alloy. The sample composition was used to engineer the
skyrmion stability below and above the TAC. A refined comparison of their
dynamical properties evidenced a reversal of the skyrmions deflection angle
with the total angular momentum density. This reversal is a clear demonstration
of the possibility of tuning the skyrmion deflection angle in ferrimagnetic
materials and paves the way for deflection-free skyrmion devices.
We study theoretically the effect of electronic interactions in 1d systems on
electron injection using periodic Lorentzian pulses, known as Levitons. We
consider specifically a system composed of a metallic single-wall carbon
nanotube, described with the Luttinger liquid formalism, a scanning tunneling
microscope (STM) tip, and metallic leads. Using the out-of-equilibrium Keldysh
Green function formalism, we compute the current and current noise in the
system. We prove that the excess noise vanishes when each Leviton injects an
integer number of electrons from the STM tip into the nanotube. This extends
the concept of minimal injection with Levitons to strongly correlated,
uni-dimensional non-chiral systems. We also study the time-dependent current
profile, and show how it is the result of interferences between pulses
non-trivially reflected at the nanotube-lead interface.

Date of feed: Fri, 06 Oct 2023 00:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Comment on "Anomalous Reentrant 5/2 Quantum Hall Phase at Moderate Landau-Level-Mixing Strength''. (arXiv:2310.03041v1 [cond-mat.mes-hall])**

Steven H. Simon

**Entanglement entropy scaling in critical phases of 1D quasiperiodic systems. (arXiv:2310.03060v1 [cond-mat.str-el])**

Miguel Gonçalves

**Group-theoretic error mitigation enabled by classical shadows and symmetries. (arXiv:2310.03071v1 [quant-ph])**

Andrew Zhao, Akimasa Miyake

**Theoretical prediction of giant Hall high harmonic generation in monolayer NbSe$_2$. (arXiv:2310.03080v1 [cond-mat.mtrl-sci])**

Daniel A. Rehn, Towfiq Ahmed, Jinkyoung Yoo, Rohit Prasankumar, Jian-Xin Zhu

**Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach. (arXiv:2310.03082v1 [cond-mat.supr-con])**

Kristian Mæland, Asle Sudbø

**Tunneling of fluxons via a Josephson resonant level. (arXiv:2310.03102v1 [cond-mat.mes-hall])**

T. Vakhtel, P. D. Kurilovich, M. Pita-Vidal, A. Bargerbos, V. Fatemi, B. van Heck

**One-Dimensional Crystallographic Etching of Few-Layer WS$_2$. (arXiv:2310.03143v1 [physics.app-ph])**

Shisheng Li, Yung-Chang Lin, Yiling Chiew, Yunyun Dai, Zixuan Ning, Hideaki Nakajima, Hong En Lim, Jing Wu, Yasuhisa Naito, Toshiya Okazaki, Zhipei Sun, Kazu Suenaga, Yoshiki Sakuma, Kazuhito Tsukagoshi, Takaaki Taniguchi

**Photonic molecule approach to multi-orbital topology. (arXiv:2310.03160v1 [physics.optics])**

Maxim Mazanov, Diego Román-Cortés, Gabriel Cáceres-Aravena, Christofer Cid, Maxim A. Gorlach, Rodrigo A. Vicencio

**Metadynamics calculations of the effect of thermal spin fluctuations on skyrmion stability. (arXiv:2310.03169v1 [cond-mat.mtrl-sci])**

Ioannis Charalampidis, Joseph Barker

**Photoconductive Effects in Single Crystals of BaZrS$_3$. (arXiv:2310.03198v1 [physics.app-ph])**

Boyang Zhao, Huandong Chen, Ragib Ahsan, Fei Hou, Eric R Hoglund, Shantanu Singh, Huan Zhao, Han Htoon, Andrey Krayev, Maruda Shanmugasundaram, Patrick E Hopkins, Jan Seidel, Rehan Kapadia, Jayakanth Ravichandran

**Efficient network exploration by means of resetting self-avoiding random walkers. (arXiv:2310.03203v1 [cond-mat.stat-mech])**

Gaia Colombani, Giulia Bertagnolli, Oriol Artime

**Planar Hall effect in Weyl semimetals induced by pseudoelectromagnetic fields. (arXiv:2310.03209v1 [cond-mat.mes-hall])**

L. Medel Onofre, A. Martín-Ruiz

**Biorthogonal Majorana zero modes, extended waves in continuum of bound states and non-Hermitian Toda soliton-fermion duality. (arXiv:2310.03215v1 [hep-th])**

Harold Blas

**Localization transition in non-Hermitian systems depending on reciprocity and hopping asymmetry. (arXiv:2310.03412v1 [cond-mat.dis-nn])**

Daniil Kochergin, Vasilii Tiselko, Arsenii Onuchin

**Noise-Induced Phase Separation and Local Entropy Production Rate in Scalar Field Theories Driven by Persistent Noise. (arXiv:2310.03423v1 [cond-mat.stat-mech])**

Matteo Paoluzzi, Demian Levis, Andrea Crisanti, Ignacio Pagonabarraga

**Spontaneous interstitial (anti)merons in D$_{2d}$ symmetric Mn-Pt(Pd)-Sn-In system. (arXiv:2310.03427v1 [cond-mat.mtrl-sci])**

Bimalesh Giri, Dola Chakrabartty, S. S. P. Parkin, Ajaya K. Nayak

**Spin-orbit torques and spin Hall magnetoresistance generated by twin-free and amorphous Bi0.9Sb0.1 topological insulator films. (arXiv:2310.03487v1 [cond-mat.mtrl-sci])**

Federico Binda, Stefano Fedel, Santos Francisco Alvarado, Paul Noël, Pietro Gambardella

**A minimal quantum dot-based Kitaev chain with only local superconducting proximity effect. (arXiv:2310.03536v1 [cond-mat.mes-hall])**

William Samuelson, Viktor Svensson, Martin Leijnse

**Exotic rare earth-based materials for emerging spintronic technology. (arXiv:2310.03541v1 [cond-mat.mtrl-sci])**

Sachin Gupta

**Localization of Dirac modes in the $\mathrm{SU}(2)$-Higgs model at finite temperature. (arXiv:2310.03542v1 [hep-lat])**

György Baranka, Matteo Giordano

**Observation of topologically distinct corner states in "bearded" photonic Kagome lattices. (arXiv:2310.03558v1 [physics.optics])**

Limin Song, Domenico Bongiovanni, Zhichan Hu, Ziteng Wang, Shiqi Xia, Liqin Tang, Daohong Song, Roberto Morandotti, Zhigang Chen

**Anomalous Hall effect by chiral spin textures in two-dimensional Luttinger model. (arXiv:2310.03576v1 [cond-mat.mes-hall])**

Ryunosuke Terasawa, Hiroaki Ishizuka

**Unconventional superconductivity in Sc$_2$Ir$_{4-x}$Si$_x$ by spin-orbit coupling driven flat band. (arXiv:2310.03609v1 [cond-mat.supr-con])**

Zhengyan Zhu, Yuxiang Wu, Shengtai Fan, Yiliang Fan, Yiwen Li, Yongze Ye, Xiyu Zhu, Haijun Zhang, Hai-Hu Wen

**The exact evaluation of hexagonal spin-networks and topological quantum neural networks. (arXiv:2310.03632v1 [quant-ph])**

Matteo Lulli, Antonino Marciano, Emanuele Zappala

**Interacting nodal semimetals with non-linear bands. (arXiv:2310.03653v1 [cond-mat.str-el])**

Arianna Poli, Niklas Wagner, Max Fischer, Alessandro Toschi, Giorgio Sangiovanni, Sergio Ciuchi

**Topological Density Correlations in a Fermi Gas. (arXiv:2310.03737v1 [cond-mat.quant-gas])**

Pok Man Tam, Charles L. Kane

**Hunting for quantum-classical crossover in condensed matter problems. (arXiv:2210.14109v2 [quant-ph] UPDATED)**

Nobuyuki Yoshioka, Tsuyoshi Okubo, Yasunari Suzuki, Yuki Koizumi, Wataru Mizukami

**Homotopy Classification of loops of Clifford unitaries. (arXiv:2306.09903v2 [math-ph] UPDATED)**

Roman Geiko, Yichen Hu

**Weak first-order phase transitions in the frustrated square lattice J1-J2 classical Ising model. (arXiv:2306.12021v3 [cond-mat.stat-mech] UPDATED)**

Adil A. Gangat

**Reversal of the skyrmion topological deflection across ferrimagnetic angular momentum compensation. (arXiv:2307.04669v2 [cond-mat.mtrl-sci] UPDATED)**

L. Berges, R. Weil, A. Mougin, J. Sampaio

**Minimal alternating current injection into carbon nanotubes. (arXiv:2307.11943v3 [cond-mat.mes-hall] UPDATED)**

Kota Fukuzawa, Takeo Kato, Thibaut Jonckheere, Jérôme Rech, Thierry Martin

Found 6 papers in prb Dzyaloshinskii-Moriya interaction (DMI) is of particular interest as it plays a primary role in stabilizing topological chiral magnetism such as skyrmions and has been intensively studied due to its potential applications for next-generation information storage technologies. For two-dimensional (2D)… Neutron scattering is used to study spin waves in the three-dimensional Heisenberg ferromagnet ${\mathrm{YTiO}}_{3}$, with spin-spin exchange disorder introduced via La substitution at the Y site. No significant changes are observed in the spin-wave dispersion up to a La concentration of 20%. Howeve… Conductivity in a multiband system can be divided into intra- and interband contributions, and the latter further into symmetric and antisymmetric parts. In a flat band, intraband conductivity vanishes and the antisymmetric interband contribution, proportional to the Berry curvature, corresponds to … Dirac semimetals (DSMs) have demonstrated many exotic properties, such as high carrier mobility, 3D quantum spin Hall effect, and topologically protected spin transport. However, their spin degeneracy has inhibited widespread applications in spintronics and quantum devices. Using a helicity-dependent photocurrent (HDPC), the authors demonstrate here spin generation in strain-free DSM Cd${}_{3}$As${}_{2}$ nanobelt field effect transistors at room temperature. The observed HDPC is attributed to spin-polarized Fermi arcs at the surface. This work provides key insights on light-controlled spin manipulation in Dirac materials. Topological excitations or defects such as solitons are ubiquitous throughout physics, supporting numerous interesting phenomena like zero-energy modes with exotic statistics and fractionalized charges. In this paper, we study such objects through the lens of symmetry-resolved entanglement entropy. … Deviation from perfect conical dispersion in Dirac materials, such as the presence of mass or tilting, enhances the control and directionality of electronic transport. To identify these signatures, we analyze the thermal derivative spectra of optical reflectivity in doped massive tilted Dirac system…

Date of feed: Fri, 06 Oct 2023 03:17:05 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) **Strong Dzyaloshinskii-Moriya interaction in two-dimensional magnets via lithium absorption**

Cheng Ma, Kuijuan Jin, Chen Ge, Er-Jia Guo, Can Wang, and Xiulai Xu

Author(s): Cheng Ma, Kuijuan Jin, Chen Ge, Er-Jia Guo, Can Wang, and Xiulai Xu

[Phys. Rev. B 108, 134405] Published Thu Oct 05, 2023

**Effect of random antiferromagnetic exchange on the spin waves in a three-dimensional Heisenberg ferromagnet**

S. Hameed, Z. Wang, D. M. Gautreau, J. Joe, K. P. Olson, S. Chi, P. M. Gehring, T. Hong, D. M. Pajerowski, T. J. Williams, Z. Xu, M. Matsuda, T. Birol, R. M. Fernandes, and M. Greven

Author(s): S. Hameed, Z. Wang, D. M. Gautreau, J. Joe, K. P. Olson, S. Chi, P. M. Gehring, T. Hong, D. M. Pajerowski, T. J. Williams, Z. Xu, M. Matsuda, T. Birol, R. M. Fernandes, and M. Greven

[Phys. Rev. B 108, 134406] Published Thu Oct 05, 2023

**Conductivity in flat bands from the Kubo-Greenwood formula**

Kukka-Emilia Huhtinen and Päivi Törmä

Author(s): Kukka-Emilia Huhtinen and Päivi Törmä

[Phys. Rev. B 108, 155108] Published Thu Oct 05, 2023

**Spatially dispersive helicity-dependent photocurrent in Dirac semimetal ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ nanobelts**

Bob Minyu Wang, Yuqing Zhu, Henry Clark Travaglini, Renzhi Sun, Sergey Y. Savrasov, William Hahn, Klaus van Benthem, and Dong Yu

Author(s): Bob Minyu Wang, Yuqing Zhu, Henry Clark Travaglini, Renzhi Sun, Sergey Y. Savrasov, William Hahn, Klaus van Benthem, and Dong Yu

[Phys. Rev. B 108, 165405] Published Thu Oct 05, 2023

**Charge-resolved entanglement in the presence of topological defects**

Dávid X. Horváth, Shachar Fraenkel, Stefano Scopa, and Colin Rylands

Author(s): Dávid X. Horváth, Shachar Fraenkel, Stefano Scopa, and Colin Rylands

[Phys. Rev. B 108, 165406] Published Thu Oct 05, 2023

**Thermal difference reflectivity of tilted two-dimensional Dirac materials**

M. A. Mojarro, R. Carrillo-Bastos, and Jesús A. Maytorena

Author(s): M. A. Mojarro, R. Carrillo-Bastos, and Jesús A. Maytorena

[Phys. Rev. B 108, L161401] Published Thu Oct 05, 2023

Found 1 papers in prl Gapped superconductivity emerging via intervalley coherence in bilayer graphene or monolayer WSe${}_{2}$ can lead to formation of Majorana zero modes.

Date of feed: Fri, 06 Oct 2023 03:17:06 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) **Gate-Defined Topological Josephson Junctions in Bernal Bilayer Graphene**

Ying-Ming Xie, Étienne Lantagne-Hurtubise, Andrea F. Young, Stevan Nadj-Perge, and Jason Alicea

Author(s): Ying-Ming Xie, Étienne Lantagne-Hurtubise, Andrea F. Young, Stevan Nadj-Perge, and Jason Alicea

[Phys. Rev. Lett. 131, 146601] Published Thu Oct 05, 2023

Found 1 papers in acs-nano

Date of feed: Thu, 05 Oct 2023 13:07:20 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] Laser-Induced MXene-Functionalized Graphene Nanoarchitectonics-Based Microsupercapacitor for Health Monitoring Application**

Sujit Deshmukh, Kalyan Ghosh, Martin Pykal, Michal Otyepka, and Martin PumeraACS NanoDOI: 10.1021/acsnano.3c07319

Found 1 papers in sci-rep Scientific Reports, Published online: 05 October 2023; doi:10.1038/s41598-023-43985-z**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)

Found 1 papers in comm-phys Communications Physics, Published online: 05 October 2023; doi:10.1038/s42005-023-01374-y**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) **Dynamical and topological properties of the spin angular momenta in general electromagnetic fields**

Xiaocong Yuan