Found 38 papers in cond-mat Recent findings indicate that orbital angular momentum (OAM) has the
capability to induce the intrinsic orbital Hall effect (OHE), which is
characterized by orbital Chern number in the orbital Hall insulator. Unlike the
spin-polarized channel in Quantum anomalous Hall insulator, the OAM is
valley-locked, posing challenges in manipulating the corresponding edge state.
Here we demonstrate the sign-reversal orbital Chern number through strain
engineering by combing the $k \cdot p$ model and first-principles calculation.
Under the manipulation of strain, we observe the transfer of non-zero OAM from
the valence band to the conduction band, aligning with the orbital contribution
in the electronic structure. Our investigation reveals that electrons and holes
with OAM exhibit opposing trajectories, resulting in a reversal of the orbital
Hall conductivity. Furthermore, we explore the topological quantum state
between the sign-reversible OHE.
The Hofstadter model allows to describe and understand several phenomena in
condensed matter such as the quantum Hall effect, Anderson localization, charge
pumping, and flat-bands in quasiperiodic structures, and is a rare example of
fractality in the quantum world. An apparently unrelated system, the
relativistic Toda lattice, has been extensively studied in the context of
complex nonlinear dynamics, and more recently for its connection to
supersymmetric Yang-Mills theories and topological string theories on
Calabi-Yau manifolds in high-energy physics. Here we discuss a recently
discovered spectral relationship between the Hofstadter model and the
relativistic Toda lattice which has been later conjectured to be related to the
Langlands duality of quantum groups. Moreover, by employing similarity
transformations compatible with the quantum group structure, we establish a
formula parametrizing the energy spectrum of the Hofstadter model in terms of
elementary symmetric polynomials and Chebyshev polynomials. The main tools used
are the spectral duality of tridiagonal matrices and the representation theory
of the elementary quantum group.
The circularly polarized photogalvanic effect (CPGE) is studied in chiral
Weyl semimetals with short-ranged quenched disorder. Without disorder, the
topological properties of chiral Weyl semimetals lead to the quantization of
the CPGE, which is a second-order optical response. Using a combination of
diagrammatic perturbation theory in the continuum and exact numerical
calculations via the kernel polynomial method on a lattice model we show that
disorder perturbatively destabilizes the quantization of the CPGE.
Reports of unconventional superconductivity in UBe13 in 1983 and soon
thereafter of the possible coexistence of bulk superconductivity and spin
fluctuations in UPt3 marked the beginning of a 40-year adventure in the study
of strongly correlated quantum materials and phenomena at Los Alamos. The
subsequent discovery and exploration of heavy-fermion magnetism, cuprates,
Kondo insulators, Ce- and Pu-115 superconductors and, more broadly, quantum
states of narrow-band systems provided challenges for the next 30 years.
Progress was not made in a vacuum but benefitted from significant advances in
the Americas, Asia and Europe as well as from essential collaborations,
visitors and Los Alamos students and postdocs, many subsequently setting their
own course in SCES. As often the case, serendipity played a role in shaping
this history.
We investigate the effects of bacterial activity on the mixing and transport
properties of two-dimensional, time-periodic flows in experiments and in a
simple model. We focus on the interactions between swimming E. coli and the
flow Lagrangian Coherent Structure (LCS), which are computed from
experimentally measured velocity fields. Experiments show that such
interactions are non-trivial and can lead to transport barriers through which
the tracer flux is significantly reduced. Using the Poincar\'e map, we show
that these transport barriers coincide with the outermost members of elliptic
LCSs known as Lagrangian vortex boundaries. Numerical simulations further show
that elliptic LCSs can repel elongated swimmers and lead to swimmer depletion
within Lagrangian coherent vortices. A simple mechanism shows that such
depletion is due to the preferential alignment of elongated swimmers with the
tangents of elliptic LCSs. Our results provide insights into understanding the
transport of microorganisms in complex flows with dynamical topological
features from a Lagrangian viewpoint.
Materials characterization remains a labor-intensive process, with a large
amount of expert time required to post-process and analyze micrographs. As a
result, machine learning has become an essential tool in materials science,
including for materials characterization. In this study, we perform an in-depth
analysis of the prediction of crystal coverage in WSe$_2$ thin film atomic
force microscopy (AFM) height maps with supervised regression and segmentation
models. Regression models were trained from scratch and through transfer
learning from a ResNet pretrained on ImageNet and MicroNet to predict monolayer
crystal coverage. Models trained from scratch outperformed those using features
extracted from pretrained models, but fine-tuning yielded the best performance,
with an impressive 0.99 $R^2$ value on a diverse set of held-out test
micrographs. Notably, features extracted from MicroNet showed significantly
better performance than those from ImageNet, but fine-tuning on ImageNet
demonstrated the reverse. As the problem is natively a segmentation task, the
segmentation models excelled in determining crystal coverage on image patches.
However, when applied to full images rather than patches, the performance of
segmentation models degraded considerably, while the regressors did not,
suggesting that regression models may be more robust to scale and dimension
changes compared to segmentation models. Our results demonstrate the efficacy
of computer vision models for automating sample characterization in 2D
materials while providing important practical considerations for their use in
the development of chalcogenide thin films.
Inversion symmetry breaking is critical for many quantum effects and
fundamental for spin-orbit torque, which is crucial for next-generation
spintronics. Recently, a novel type of gigantic intrinsic spin-orbit torque has
been established in the topological van-der-Waals (vdW) magnet iron germanium
telluride. However, it remains a puzzle because no clear evidence exists for
interlayer inversion symmetry breaking. Here, we report the definitive evidence
of broken inversion symmetry in iron germanium telluride directly measured by
the second harmonic generation (SHG) technique. Our data show that the crystal
symmetry reduces from centrosymmetric P63/mmc to noncentrosymmetric polar P3m1
space group, giving the three-fold SHG pattern with dominant out-of-plane
polarization. Additionally, the SHG response evolves from an isotropic pattern
to a sharp three-fold symmetry upon increasing Fe deficiency, mainly due to the
transition from random defects to ordered Fe vacancies. Such SHG response is
robust against temperature, ensuring unaltered crystalline symmetries above and
below the ferromagnetic transition temperature. These findings add crucial new
information to our understanding of this interesting vdW metal, iron germanium
telluride: band topology, intrinsic spin-orbit torque and topological vdW polar
metal states.
We report the topological electronic structure, magnetic, and
magnetotransport properties of a noncentrosymmetric compound GdAlSi. Magnetic
susceptibility shows an antiferromagnetic transition at $T_\mathrm{N}$ = 32 K.
In-plane isothermal magnetization exhibits an unusual hysteresis behavior at
higher magnetic field, rather than near zero field. Moreover, the hysteresis
behavior is asymmetric under positive and negative magnetic fields.
First-principles calculations were performed on various magnetic
configurations, revealing that the antiferromagnetic state is the ground state,
and the spiral antiferromagnetic state is a close competing state. The
calculations also reveal that GdAlSi hosts multiple Weyl points near the Fermi
energy. The band structure measured by angle-resolved photoemission
spectroscopy (ARPES) shows relatively good agreement with the theory, with the
possibility of Weyl nodes slightly above the Fermi energy. Within the magnetic
ordered state, we observe an exceptionally large anomalous Hall conductivity
(AHC) of ~ 1310 $\Omega^{-1}$cm$^{-1}$ at 2 K. Interestingly, the anomalous
Hall effect persists up to room temperature with a significant value of AHC (~
155 $\Omega^{-1}$cm$^{-1}$). Our analysis indicates that the large AHC
originates from the Berry curvature associated with the multiple pairs of Weyl
points near Fermi energy.
We delve into growing open chemical reaction systems (CRSs) characterized by
autocatalytic reactions within a variable volume, which changes in response to
these reactions. Understanding the thermodynamics of such systems is crucial
for comprehending biological cells and constructing protocells, as it sheds
light on the physical conditions necessary for their self-replication. Building
on our recent work, where we developed a thermodynamic theory for growing CRSs
featuring basic autocatalytic motifs with regular stoichiometric matrices, we
now expand this theory to include scenarios where the stoichiometric matrix has
a nontrivial left kernel space. This extension introduces conservation laws,
which limit the variations in chemical species due to reactions, thereby
confining the system's possible states to those compatible with its initial
conditions. By considering both thermodynamic and stoichiometric constraints,
we clarify the environmental and initial conditions that dictate the CRSs'
fate-whether they grow, shrink, or reach equilibrium. We also find that the
conserved quantities significantly influence the equilibrium state achieved by
a growing CRS. These results are derived independently of specific
thermodynamic potentials or reaction kinetics, therefore underscoring the
fundamental impact of conservation laws on the growth of the system.
The opening of an energy gap in the electronic structure generally indicates
the presence of interactions. In materials with low carrier density and short
screening length, long-range Coulomb interaction favors the spontaneous
formation of electron-hole pairs, so-called excitons, opening an excitonic gap
at the Fermi level. Excitonic materials host unique phenomenons associated with
pair excitations. However, there is still no generally recognized
single-crystal material with excitonic order, which is, therefore, awaited in
condensed matter physics. Here, we show that excitonic states may exist in the
quasi-one-dimensional material Ta$_2$Pd$_3$Te$_5$, which has an almost ideal
Dirac-like band structure, with Dirac point located exactly at Fermi level. We
find that an energy gap appears at 350 K, and it grows with decreasing
temperature. The spontaneous gap opening is absent in a similar material
Ta$_2$Ni$_3$Te$_5$. Intriguingly, the gap is destroyed by the potassium
deposition on the crystal, likely due to extra-doped carriers. Furthermore, we
observe a pair of in-gap flat bands, which is an analog of the impurity states
in a superconducting gap. All these observations can be properly explained by
an excitonic order, providing Ta$_2$Pd$_3$Te$_5$ as a new and promising
candidate realizing excitonic states.
We presents a new strategy to create a van der Waals-based magnetic tunnel
junction (MTJ) that consists of a three-atom layer thickness of graphene (Gr)
sandwiched with hexagonal boron nitride (hBN) by introducing a monoatomic Boron
vacancy in both hBN layers. The magnetic properties and electronic structure of
the system were investigated using density functional theory (DFT), while the
transmission probability of the MTJ was investigated using the
Landauer-B\"uttiker formalism within the non-equilibrium Green function method.
The Stoner gap was found to be created between the spin-majority channel and
the spin-minority channel on LDOS of the hBN monoatomic boron-vacancy (V$_B$)
near the vicinity of Fermi energy, creating a possible control of the spin
valve by considering two different magnetic allignment of hBN(V$_B$) layers,
anti-parallel and parallel configuration. The results of the transmission
probability calculation showed a high electron transmission in the parallel
configuration of the hBN(V$_B$) layers and a low transmission when the
antiparallel configuration was considered. A high TMR ratio of approximately
400% was observed when comparing the antiparallel and parallel configuration of
hBN(V$_B$) layers in the hBN (V$_B$)/Gr/hBN(V$_B$), giving the highest TMR for
the thinnest MTJ system.
The localized nature of a flat band is understood by the existence of a
compact localized eigenstate. However, the localization properties of a
partially flat band, ubiquitous in surface modes of topological semimetals,
have been unknown. We show that the partially flat band is characterized by a
non-normalizable compact localized state(NCLS). The partially flat band
develops only in a momentum range, where normalizable Bloch wave functions can
be obtained by the linear combination of the NCLSs. Outside this momentum
region, a ghost flat band, unseen from the band structure, is introduced for
the consistent counting argument with the full set of NCLSs. Then, we
demonstrate that the Wannier function corresponding to the partially flat band
exhibits an algebraic($\sim 1/r^{1+\epsilon}$ in 1D and $\sim
1/r^{3/2+\epsilon}$ in 2D) decay behavior, where $\epsilon$ is a positive
number. Namely, one can have the Wannier obstruction even in a topologically
trivial band if it is partially flat. Finally, we develop a construction scheme
of a tight-binding model of the topological semimetal by designing an NCLS.
Technologies enabling passive daytime radiative cooling and daylight
harvesting are highly relevant for energy-efficient buildings. Despite recent
progress demonstrated with passively cooling polymer coatings, however, it
remains challenging to combine also a passive heat gain mechanism into a single
substrate for all-round thermal management. Herein, we developed an optical
wood (OW) with switchable transmittance of solar irradiation enabled by the
hierarchically porous structure, ultralow absorption in solar spectrum and high
infrared absorption of cellulose nanofibers. After delignification, the OW
shows a high solar reflectance (94.9%) in the visible and high broadband
emissivity (0.93) in the infrared region (2.5-25 $\mu$m). Owing to the
exceptional mass transport of its aligned cellulose nanofibers, OW can quickly
switch to a new highly transparent state following phenylethanol impregnation.
The solar transmittance of optical wood (OW-II state) can reach 68.4% from 250
to 2500 nm. The switchable OW exhibits efficient radiative cooling to 4.5
{\deg}C below ambient temperature in summer (81.4 W m$^{-2}$ cooling power),
and daylight heating to 5.6 {\deg}C above the temperature of natural wood in
winter (heating power 229.5 W m$^{-2}$), suggesting its promising role as a
low-cost and sustainable solution to all-season thermal management
applications.
An intense low-energy broad luminescence peak (L-peak) is usually observed in
2D transition metal dichalcogenides (TMDs) at low temperatures. L-peak has
earlier been attributed to bound excitons, but its origins are widely debated
with direct consequences on optoelectronic properties. To decouple the
contributions of physisorbed and chemisorbed oxygen, organic adsorbates, and
strain on L-peak, we measured a series of monolayer (ML) MoS2 samples
(mechanically exfoliated (ME), synthesized by oxygen-assisted chemical vapour
deposition (O-CVD), hexagonal boron nitride (hBN) covered and hBN
encapsulated). Emergence of L-peak below 150 K and saturation of
photoluminescence (PL) intensity with laser power confirm bound nature of
L-peak. Anomalously at room temperature, O-CVD samples show high A-exciton PL
(c.f. ME), but reduced PL at low temperatures, which is attributed to
strain-induced direct-to-indirect bandgap change in low defect O-CVD MoS2.
Further, L-peak redshifts dramatically ~ 130 meV for O-CVD samples (c.f. ME).
These observations are fully consistent with our predictions from density
functional theory (DFT) calculations, considering effects of both strain and
defects, and supported by Raman spectroscopy. In ME samples, charged oxygen
adatoms are identified as thermodynamically favourable defects which can create
in-gap states, and contribute to the L-peak. The useful effect of hBN is found
to originate from reduction of charged oxygen adatoms and hydrocarbon
complexes. This combined experimental-theoretical study allows an enriched
understanding of L-peak and beneficial impact of hBN, and motivates collective
studies of strain and defects with direct impact on optoelectronics and quantum
technologies.
Magnetic droplets are nanoscale, non-topological, dynamical solitons that can
be nucleated in different spintronic devices, such as spin torque
nano-oscillators (STNOs) and spin Hall nano-oscillators (SHNOs). This chapter
first briefly discusses the theory of spin current driven dissipative magnetic
droplets in ferromagnetic thin films with uniaxial anisotropy. We then
thoroughly review the research literature on magnetic droplets and their
salient features, as measured using electrical, microwave, and synchrotron
techniques, and as envisaged by micromagnetic simulations. We also touch upon a
closely related soliton, the dynamical skyrmion. Finally, we present an outlook
of new routes in droplet science.
We implement circuit quantum electrodynamics (cQED) with quantum dots in
bilayer graphene, a maturing material platform for semiconductor qubits that
can host long-lived spin and valley states. The presented device combines a
high-impedance ($Z_\mathrm{r} \approx 1 \mathrm{k{\Omega}}$) superconducting
microwave resonator with a double quantum dot electrostatically defined in a
graphene-based van der Waals heterostructure. Electric dipole coupling between
the subsystems allows the resonator to sense the electric susceptibility of the
double quantum dot from which we reconstruct its charge stability diagram. We
achieve sensitive and fast detection with a signal-to-noise ratio of 3.5 within
1 ${\mu}\mathrm{s}$ integration time. The charge-photon interaction is
quantified in the dispersive and resonant regimes by comparing the
coupling-induced change in the resonator response to input-output theory,
yielding a maximal coupling strength of $g/2{\pi} = 49.7 \mathrm{MHz}$. Our
results introduce cQED as a probe for quantum dots in van der Waals materials
and indicate a path toward coherent charge-photon coupling with bilayer
graphene quantum dots.
The TiSiCO-family monolayer $X_2Y$CO$_2$($X$=Ti, Zr, Hf; $Y$=Si, Ge) is a
two-dimensional second-order topological insulator with unique valley-layer
coupling in equilibrium condition. In this work, based on the four-band
tight-binding (TB) model of monolayer Ti$_2$SiCO$_2$ (ML-TiSiCO) and the
Floquet theory, we study the non-equilibrium properties of the ML-TiSiCO under
a periodic field of laser and a gate-electric field. We find the interaction
between the time-periodic polarized light and the electric field can lead to a
variety of intriguing topological phase transitions. By driving the system with
only circularly polarized light (CPL), a photoinduced topological phase
transition occurs from a second-order topological insulator to a Chern
insulator with a Chern number of $C=\pm$2, and the sign of the Chern number $C$
is determined by the chirality of the incident light. Further adding a
perpendicular electric field, we find that the ML-TiSiCO exhibits a rich phase
diagram, consisting of Chern insulators with different Chern numbers and
various topological semimetals. In contrast, since the linearly polarized light
(LPL) does not break time-reversal symmetry, the Chern number of the system
would not be changed under the irradiation of LPL. However, there still exist
many topological phases, including second-order topological insulator,
topological semi-Dirac, Dirac and valley-polarized Dirac semimetals under the
interaction between the LPL and the electric field. Our results not only
enhance the understanding of the fundamental properties of ML-TiSiCO but also
broaden the potential applications of such materials in optoelectronic devices.
It has been known that the large-$q$ complex SYK model falls under the same
universality class as that of van der Waals (mean-field) which is also shared
by a variety of black holes. At the same time, it also saturates the
Maldacena-Shenker-Stanford (MSS) bound and is thus maximally chaotic. This work
establishes the robustness of shared universality class and quantum chaos for
SYK-like models by extending to a system of coupled large-$q$ complex SYK
models of different orders. We provide a detailed derivation of thermodynamic
(critical exponents) properties observing a phase transition and dynamic
(Lyapunov exponent) properties via the out-of-time correlator (OTOC)
calculations. Our analysis reveals that, despite the introduction of an
additional scaling parameter through interaction strength ratios, the system
undergoes a continuous phase transition at low temperatures, similar to that of
a single SYK model. The critical exponents align with the Landau-Ginzburg
(mean-field) universality class, shared with van der Waals gases and various
AdS black holes. Furthermore, we demonstrate that the coupled SYK system
remains maximally chaotic in the large-$q$ limit at low temperatures, adhering
to the Maldacena-Shenker-Stanford (MSS) bound, a feature consistent with single
large-$q$ complex SYK model. These findings open avenues for broader inquiries
into the universality and chaos in complex quantum systems by showing that our
coupled SYK system belong to the same universality class as that of van der
Waals and various AdS black holes while saturating the MSS bound of quantum
chaos.
We investigate the transport properties of Dirac fermions in ABC trilayer
graphene {(ABC-TLG)} superlattices. Based on the transfer matrix method and
using the continuity conditions of the system, we calculate the transmission
probabilities {and the corresponding conductance}. In the context of two-band
tunneling, Klein tunneling is observed, but it decreases with an increase in
the number of cells. An interlayer bias opens a gap when the number of cells is
increased. Furthermore, increasing the barrier/well width and the cell number
results in an increase in the number of gaps and oscillations in both two-band
and six-band cases. Asymmetry is found in the scattered transmission due to the
presence of the interlayer bias. The conductance decreases when the number of
cells increases and a gap region is found. Our results indicate that adjusting
the number of cells, the width of the barrier/well, and the barrier heights
makes it possible to control electron tunneling and the gap number in ABC-TLG.
These findings provide valuable insights for the development of electronic
devices using graphene materials.
Topological defects are a ubiquitous phenomenon in diverse physical systems.
In nematic liquid crystals (LCs), they are dynamic, physicochemically distinct,
sensitive to stimuli, and are thereby promising for a range of applications.
However, our current understanding of the mechanics and dynamics of defects in
nematic LCs remain limited and are often overwhelmed by the intricate details
of the specific systems. Here, we unify singular and nonsingular line defects
as superelastic rods and combine theory, simulation, and experiment to
quantitatively measure their effective elastic moduli, including line tension,
torsional rigidity, and twist--stretch coefficient. Interestingly, we found
that line defects exhibit a negative twist--stretch coupling, meaning that
twisted line defects tend to unwind under stretching, which is reminiscent of
DNA molecules. A patterned nematic cell experiment further confirmed the above
findings. Taken together, we have established an effective elasticity theory
for nematic defects, paving the way towards understanding and engineering their
deformation and transformation in driven and active nematic materials.
When subject to measurements, quantum systems evolve along stochastic quantum
trajectories that can be naturally equipped with a geometric phase observable
via a post-selection in a final projective measurement. When post-selecting the
trajectories to form a close loop, the geometric phase undergoes a topological
transition driven by the measurement strength. Here, we study the geometric
phase of a subset of self-closing trajectories induced by a continuous Gaussian
measurement of a single qubit system. We utilize a stochastic path integral
that enables the analysis of rare self-closing events using action methods and
develop the formalism to incorporate the measurement-induced geometric phase
therein. We show that the geometric phase of the most likely trajectories
undergoes a topological transition for self-closing trajectories as a function
of the measurement strength parameter. Moreover, the inclusion of Gaussian
corrections in the vicinity of the most probable self-closing trajectory
quantitatively changes the transition point in agreement with results from
numerical simulations of the full set of quantum trajectories.
Pairing of electrons is ubiquitous in electronic systems featuring attractive
inter-electron interactions, as exemplified in superconductors.
Counter-intuitively, it can also be mediated in certain circumstances by the
repulsive Coulomb interaction alone. Quantum Hall (QH) Fabry-P\'erot
interferometers (FPIs) tailored in two-dimensional electron gas under a
perpendicular magnetic field has been argued to exhibit such unusual electron
pairing seemingly without attractive interaction. Here, we show evidence in
graphene QH FPIs revealing not only a similar electron pairing at bulk filling
factor nu=2 but also an unforeseen emergence of electron tripling characterized
by a fractional Aharonov-Bohm flux period h/3e (h is the Planck constant and e
the electron charge) at nu=3. Leveraging a novel plunger-gate spectroscopy, we
demonstrate that electron pairing (tripling) involves correlated charge
transport on two (three) entangled QH edge channels. This spectroscopy
indicates a quantum interference flux-periodicity determined by the sum of the
phases acquired by the distinct QH edge channels having slightly different
interfering areas. While recent theory invokes the dynamical exchange of
neutral magnetoplasmons -- dubbed neutralons -- as mediator for electron
pairing, our discovery of three entangled QH edge channels with apparent
electron tripling defies understanding and introduces a new three-body problem
for interacting fermions.
Binary metal sulfides are potential material family for exploring high Tc
superconductors under high pressure. In this work, we study the crystal
structures, electronic structures and superconducting properties of the Lu-S
system in the pressure range from 0 GPa to 200 GPa, combining crystal structure
predictions with ab-initio calculations. We predict 14 new structures,
encompassing 7 unidentified stoichiometries. Within the S-rich structures, the
formation of S atom cages is beneficial for superconductivity, with the
superconducting transition temperature 25.86 K and 25.30 K for LuS6-C2/m at 70
GPa and LuS6-R-3m at 90 GPa, respectively. With the Lu/(Lu+S) ratio increases,
the Lu-d electrons participate more in the electronic properties at the Fermi
energy, resulting in the coexistence of superconductivity and topological
non-triviality of LuS2-Cmca, as well as the superconductivity of predicted
Lu-rich compounds. Our calculation is helpful for understanding the exotic
properties in transition metal sulfides system under high pressure, providing
possibility in designing novel superconductors for future experimental and
theoretical works.
The (Bi2)m(Bi2Te3)n homologous series possess natural multilayer
heterostructure with intriguing physical properties at ambient pressure.
Herein, we report the pressure-dependent evolution of the structure and
electrical transport of the dual topological insulator BiTe, a member of the
(Bi2)m(Bi2Te3)n series. With applied pressure, BiTe exhibits several different
crystal structures and distinct superconducting states, which is remarkably
similar to other members of the (Bi2)m(Bi2Te3)n series. Our results provide a
systematic phase diagram for the pressure-induced superconductivity in BiTe,
contributing to the highly interesting physics in this (Bi2)m(Bi2Te3)n series.
We introduce a novel approach to the three-dimensional reconstruction of
superfluid vortex filaments using deep convolutional neural networks.
Superfluid vortices, quantum mechanical phenomena of immense scientific
interest, are challenging to image due to their small dimensions and intricate
topology. Here, we propose a deep-learning methodology that serves as a
proof-of-principle for fully reconstructing the topology of superfluid vortex
filaments. We have trained a convolutional neural network on a large dataset of
simulated superfluid density images obtained by solving the Gross--Pitaevskii
equation at scale, enabling it to learn the complex patterns and features
inherent to superfluid vortex filaments. The network ingests the integrated
density along the axial, coronal, and sagittal directions and outputs the
reconstructed superfluid vortex filaments in three dimensions. We demonstrate
the success of this approach over a range of vortex densities of simulated
isotropic quantum turbulence, enabling access to the characteristic scaling law
of the decaying vortex line length.
Antiferromagnets hosting structural or magnetic order that breaks time
reversal symmetry are of increasing interest for 'beyond von Neumann computing'
applications because the topology of their band structure allows for intrinsic
physical properties, exploitable in integrated memory and logic function. One
such group are the non-collinear antiferromagnets. Essential for domain
manipulation is the existence of small net moments found routinely when the
material is synthesised in thin film form and attributed to symmetry-breaking
caused by spin canting, either from the Dzyaloshinskii-Moriya interaction or
from strain. Although the spin arrangement of these materials makes them highly
sensitive to strain, there is little understanding about the influence of local
strain fields caused by lattice defects on global properties, such as
magnetisation and anomalous Hall effect. This premise is investigated by
examining non-collinear films that are either highly lattice mismatched or
closely matched to their substrate. In either case, edge dislocation networks
are generated and for the former case these extend throughout the entire film
thickness, creating large local strain fields. These strain fields allow for
finite intrinsic magnetisation in seemly structurally relaxed films and
influence the antiferromagnetic domain state and the intrinsic anomalous Hall
effect.
We put forward a generalized procedure is which allows to restore the
bulk-like electron and hole wave functions from the wave functions of quantum
confined electron/hole states obtained in atomistic calculations. The procedure
is applied to the lead chalcogenide quantum dots and the effective Hamiltonian
of the exchange interaction for the ground state of an exciton localized in PbS
and PbSe quantum dots was extracted. The results demonstrate that the matrix
elements of intravalley exchange in PbS quantum dots are much more anisotropic
than ones in PbSe.
The interplay of topological electronic band structures and strong
interparticle interactions provides a promising path towards the constructive
design of robust, long-range entangled many-body systems. As a prototype for
such systems, we here study an exactly integrable, local model for a
fractionalized topological insulator. Using a controlled perturbation theory
about this limit, we demonstrate the existence of topological bands of zeros in
the exact fermionic Green's function and show that {in this model} they do
affect the topological invariant of the system, but not the quantized transport
response. Close to (but prior to) the Higgs transition signaling the breakdown
of fractionalization, the topological bands of zeros acquire a finite
``lifetime''. We also discuss the appearance of edge states and edge zeros at
real space domain walls separating different phases of the system. This model
provides a fertile ground for controlled studies of the phenomenology of
Green's function zeros and the underlying exactly solvable lattice gauge theory
illustrates the synergetic cross-pollination between solid-state theory,
high-energy physics and quantum information science.
Monolayer graphene absorbs 2.3 percent of the incident visible light. This
'small' absorption has been used to emphasize the visual transparency of
graphene, but it in fact means that multilayer graphene absorbs a sizable
fraction of incident light, which causes non-negligible fluorescence. In this
paper, we formulate the light emission properties of multilayer graphene
composed of tens to hundreds of layers using a transfer matrix method and
confirm the method's validity experimentally. We could quantitatively explain
the measured contrasts of multilayer graphene on SiO$_2$/Si substrates and
found sizable corrections, which cannot be classified as incoherent light
emissions, to the reflectance of visible light. The new component originates
from coherent emission caused by absorption at each graphene layer. Multilayer
graphene thus functions as a partial coherent light source of various
wavelengths, and it may have surface-emitting laser applications.
We construct a class of exact eigenstates of the Hamiltonian obtained by
projecting the Hubbard interaction term onto the flat band subspace of a
generic lattice model. These exact eigenstates are many body states in which an
arbitrary number of localized fermionic particles coexist with a sea of mobile
Cooper pairs with zero momentum. By considering the dice lattice as an example,
we provide evidence that these exact eigenstates are in fact manifestation of
local integrals of motions of the projected Hamiltonian. In particular the spin
and particle densities retain memory of the initial state for a very long time,
if localized unpaired particles are present at the beginning of the time
evolution. This shows that many-body localization of quasiparticles and
superfluidity can coexist even in generic two-dimensional lattice models with
flat bands, for which it is not known how to construct local conserved
quantities. Our results open new perspectives on the old condensed matter
problem of the interplay between superconductivity and localization.
We study quantum phase transitions in Bose-Fermi mixtures driven by
interspecies interaction in the quantum Hall regime. In the absence of such an
interaction, the bosons and fermions form their respective fractional quantum
Hall (FQH) states at certain filling factors. A symmetry-protected topological
(SPT) state is identified as the ground state for strong interspecies
interaction. The phase transitions between them are proposed to be described by
Chern-Simons-Higgs field theories. For a simple microscopic Hamiltonian, we
present numerical evidence for the existence of the SPT state and a continuous
transition to the FQH state. It is also found that the entanglement entropy
between the bosons and fermions exhibits scaling behavior in the vicinity of
this transition.
One of the most famous quantum systems with topological properties, the spin
$\mathcal{S}=1$ antiferromagnetic Heisenberg chain, is well-known to display
exotic $\mathcal{S}=1/2$ edge states. However, this spin model has not been
analyzed from the more general perspective of strongly correlated systems
varying the electron-electron interaction strength. Here, we report the
investigation of the emergence of the Haldane edge in a system of interacting
electrons -- the two-orbital Hubbard model -- with increasing repulsion
strength $U$ and Hund interaction $J_\mathrm{H}$. We show that interactions not
only form the magnetic moments but also form a topologically nontrivial
fermionic many-body ground-state with zero-energy edge states. Specifically,
upon increasing the strength of the Hubbard repulsion and Hund exchange, we
identify a sharp transition point separating topologically trivial and
nontrivial ground-states. Surprisingly, such a behaviour appears already at
rather small values of the interaction, in a regime where the magnetic moments
are barely developed.
We provide a non-unit disk framework to solve combinatorial optimization
problems such as Maximum Cut (Max-Cut) and Maximum Independent Set (MIS) on a
Rydberg quantum annealer. Our setup consists of a many-body interacting Rydberg
system where locally controllable light shifts are applied to individual qubits
in order to map the graph problem onto the Ising spin model. Exploiting the
flexibility that optical tweezers offer in terms of spatial arrangement, our
numerical simulations implement the local-detuning protocol while globally
driving the Rydberg annealer to the desired many-body ground state, which is
also the solution to the optimization problem. Using optimal control methods,
these solutions are obtained for prototype graphs with varying sizes at time
scales well within the system lifetime and with approximation ratios close to
one. The non-blockade approach facilitates the encoding of graph problems with
specific topologies that can be realized in two-dimensional Rydberg
configurations and is applicable to both unweighted as well as weighted graphs.
A comparative analysis with fast simulated annealing is provided which
highlights the advantages of our scheme in terms of system size, hardness of
the graph, and the number of iterations required to converge to the solution.
Recent experiments on the twisted semiconductor bilayer system $t$MoTe$_2$
have observed integer and fractional quantum anomalous Hall effects, which
occur in topological moir\'e bands at zero magnetic field. Here, we present a
global phase diagram of $t$MoTe$_2$ throughout the filling range $0< n\leq 1$
substantiated by exact diagonalization calculations. At a magic angle, we find
that the system resembles the lowest Landau level (LLL) to a remarkable degree,
exhibiting an abundance of incompressible fractional quantum anomalous Hall
states and compressible anomalous composite Fermi liquid states. Away from the
magic angle, particle-hole symmetry is strongly broken. Some LLL-like features
remain robust near half-filling, while others are replaced, predominantly by
charge density waves near $n=0$ and anomalous Hall Fermi liquids near $n=1$.
Among LLL-like phases, we find the anomalous composite Fermi liquid at
$n=\frac{1}{2}$ to be most robust against deviations from the magic angle.
Within the band-projected model, we show that strong particle-hole asymmetry
above the magic angle results from interaction-enhanced quasiparticle
dispersion near $n=1$. Our work sets the stage for future exploration of
LLL-like and beyond-LLL phases in fractional quantum anomalous Hall systems.
We develop a theory of the nonlinear optical responses in superconducting
systems in the presence of a dc supercurrent. The optical transitions between
particle-hole pair bands across the superconducting gap are allowed in clean
superconductors as the inversion symmetry breaking by supercurrent. Vertex
correction is included in optical conductivity to maintain the $U(1)$ gauge
symmetry in the mean-field formalism, which contains the contributions from
collective modes. We show two pronounced current-dependent peaks in the
second-harmonic generalization $\sigma^{(2)}(2\omega,\omega,\omega)$ at the gap
edge $2\hbar\omega=2\Delta$ and $\hbar\omega=2\Delta$ and one in the
photocurrent effect $\sigma^{(2)}(0,\omega,-\omega)$ at $\hbar\omega=2\Delta$,
all of which diverge in the clean limit. We demonstrate this in the models of a
single-band superconductor with $s$-wave and $d$-wave pairings, and Dirac
fermion systems with $s$-wave pairing. Our theory predicts that the
current-induced peak in $\text{Im}[\sigma^{(2)}(\omega)]$ is proportional to
the square of the supercurrent density in the $s$-wave single-band model, with
the same order of magnitude as the recent experimental observation of
second-harmonic generation in NbN by Nakamura et al. [Phys. Rev. Lett. 125,
097004 (2020)]. Supercurrent induced nonlinear optical spectroscopy provides a
valuable toolbox to explore novel superconductors.
Topological phases of matter exhibit edge responses with the attractive
property of robustness against deformations and defects. Such phases have
recently been realized in stochastic systems, which model a large class of
biological and chemical phenomena. However, general theoretical principles are
lacking for these systems, such as the relation between the bulk topological
invariant and observed edge responses, i.e. the celebrated bulk-edge
correspondence. We show that contrary to established topological phases,
stochastic systems require non-reciprocal (or non-Hermitian) transitions to
have edge responses. In both 1D and 2D models with different edge states, we
demonstrate that stochastic topological responses grow dramatically with
non-reciprocity while the quantum version plateaus. We further present a novel
mechanism by which non-reciprocity engenders robust edge currents in stochastic
systems. Our work establishes the crucial role of non-reciprocal interactions
in permitting robust responses in soft and living matter.
Topological superconductivity emerges in chains or arrays of magnetic atoms
coupled to a superconductor. However, the external controllability of such
systems with gate voltages is detrimental for their future implementation in a
topological quantum computer. Here we showcase the supramolecular assembly of
radical molecules on Pb(111), whose discharge is controlled by the tip of a
scanning tunneling microscope. Charged molecules carry a spin-1/2 state, as
confirmed by observing Yu-Shiba-Rusinov in-gap states by tunneling spectroscopy
at millikelvin temperature. Low energy modes are localized at island boundaries
with a long decay towards the interior, whose spectral signature is consistent
with Majorana zero modes protected by mirror symmetry. Our results open up a
vast playground for the synthesis of gate-tunable organic topological
superconductors.
Strongly interacting electronic systems possess rich phase diagrams resulting
from the competition between different quantum ground states. A general
mechanism that relieves this frustration is the emergence of microemulsion
phases, where regions of different phase self-organize across multiple length
scales. The experimental characterization of these phases often poses
significant challenges, as the long-range Coulomb interaction microscopically
mingles the competing states. Here, we use cryogenic reflectance and
magneto-optical spectroscopy to observe the signatures of the mixed state
between an electronic Wigner crystal and an electron liquid in a MoSe2
monolayer. We find that the transit into this 'microemulsion' state is marked
by anomalies in exciton reflectance, spin susceptibility, and Umklapp
scattering, establishing it as a distinct phase of electronic matter. Our study
of the two-dimensional electronic microemulsion phase elucidates the physics of
novel correlated electron states with strong Coulomb interactions.

Date of feed: Mon, 25 Dec 2023 01:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Reversal of Orbital Hall Conductivity and Emergence of Tunable Topological Quantum States in Orbital Hall Insulator. (arXiv:2312.14181v1 [cond-mat.mes-hall])**

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

**Hofstadter-Toda spectral duality and quantum groups. (arXiv:2312.14242v1 [hep-th])**

Pasquale Marra, Valerio Proietti, Xiaobing Sheng

**Absence of quantization in the circular photogalvanic effect in disordered chiral Weyl semimetals. (arXiv:2312.14244v1 [cond-mat.mes-hall])**

Ang-Kun Wu, Daniele Guerci, Yixing Fu, Justin H. Wilson, J. H. Pixley

**40 Years of SCES at Los Alamos. (arXiv:2312.14283v1 [cond-mat.str-el])**

Z. Fisk, J. L. Smith, J. D. Thompson

**Enhancing Transport Barriers with Swimming Microorganisms in Chaotic Flows. (arXiv:2312.14284v1 [physics.flu-dyn])**

Ranjiangshang Ran, Paulo E. Arratia

**Crystal Growth Characterization of WSe$_2$ Thin Film Using Machine Learning. (arXiv:2312.14311v1 [cond-mat.mtrl-sci])**

Isaiah A. Moses, Chengyin Wu, Wesley F. Reinhart

**Broken inversion symmetry in van der Waals topological ferromagnetic metal iron germanium telluride. (arXiv:2312.14384v1 [cond-mat.mtrl-sci])**

Kai-Xuan Zhang, Hwiin Ju, Hyuncheol Kim, Jingyuan Cui, Jihoon Keum, Je-Geun Park, Jong Seok Lee

**Electronic structure, magnetic and transport properties of antiferromagnetic Weyl semimetal GdAlSi. (arXiv:2312.14415v1 [cond-mat.str-el])**

Antu Laha, Asish K. Kundu, Niraj Aryal, Emil S. Bozin, Juntao Yao, Sarah Paone, Anil Rajapitamahuni, Elio Vescovo, Tonica Valla, Milinda Abeykoon, Ran Jing, Weiguo Yin, Abhay N. Pasupathy, Mengkun Liu, Qiang Li

**Thermodynamic and Stoichiometric Laws Ruling the Fates of Growing Systems. (arXiv:2312.14435v1 [cond-mat.stat-mech])**

Atsushi Kamimura, Yuki Sughiyama, Tetsuya J. Kobayashi

**Spontaneous gap opening and potential excitonic states in an ideal Dirac semimetal Ta$_2$Pd$_3$Te$_5$. (arXiv:2312.14456v1 [cond-mat.mtrl-sci])**

Peng Zhang, Yuyang Dong, Dayu Yan, Bei Jiang, Tao Yang, Jun Li, Zhaopeng Guo, Yong Huang, Bo Hao, Qing Li, Yupeng Li, Kifu Kurokawa, Rui Wang, Yuefeng Nie, Makoto Hashimoto, Donghui Lu, Wen-He Jiao, Jie Shen, Tian Qian, Zhijun Wang, Youguo Shi, Takeshi Kondo

**High Magnetoresistance Ratio on hBN Boron-Vacancy/Graphene Magnetic Tunnel Junction. (arXiv:2312.14476v1 [cond-mat.mes-hall])**

Halimah Harfah, Yusuf Wicaksono, Gagus Ketut Sunnardianto, Muhammad Aziz Majidi, Koichi Kusakabe

**Quasi-localization and Wannier Obstruction in Partially Flat Bands. (arXiv:2312.14553v1 [cond-mat.str-el])**

Jin-Hong Park, Jun-Won Rhim

**Optical wood with switchable solar transmittance for all-round thermal management. (arXiv:2312.14560v1 [physics.optics])**

He Gao, Ying Li, Yanjun Xie, Daxin Liang, Jian Li, Yonggui Wang, Zefang Xiao, Haigang Wang, Wentao Gan, Lorenzo Pattelli, Hongbo Xu

**Towards a comprehensive understanding of the low energy luminescence peak in 2D materials. (arXiv:2312.14604v1 [cond-mat.mtrl-sci])**

Keerthana S Kumar, Ajit Kumar Dash, Hasna Sabreen H, Manvi Verma, Vivek Kumar, Kenji Watanabe, Takashi Taniguchi, Gopalakrishnan Sai Gautam, Akshay Singh

**Magnetic droplet solitons. (arXiv:2312.14621v1 [cond-mat.mes-hall])**

Martina Ahlberg, Sheng Jiang, Roman Khymyn, Sunjae Chung, Johan Åkerman

**Dipole coupling of a bilayer graphene quantum dot to a high-impedance microwave resonator. (arXiv:2312.14629v1 [cond-mat.mes-hall])**

Max J. Ruckriegel, Lisa M. Gächter, David Kealhofer, Mohsen Bahrami Panah, Chuyao Tong, Christoph Adam, Michele Masseroni, Hadrien Duprez, Rebekka Garreis, Kenji Watanabe, Takashi Taniguchi, Andreas Wallraff, Thomas Ihn, Klaus Ensslin, Wei Wister Huang

**Photoinduced topological phase transition in monolayer Ti$_2$SiCO$_2$. (arXiv:2312.14639v1 [physics.optics])**

Pu Liu, Chaoxi Cui, Zhi-Ming Yu

**Thermodynamics and dynamics of coupled complex SYK models. (arXiv:2312.14644v1 [hep-th])**

Jan C. Louw, Linda M. van Manen, Rishabh Jha

**Tunneling in ABC trilayer graphene superlattice. (arXiv:2312.14704v1 [cond-mat.mes-hall])**

Mouhamadou Hassane Saley, Jaouad El-hassouny, Abderrahim El Mouhafid, Ahmed Jellal

**Line defects in nematic liquid crystals as charged superelastic rods with negative twist--stretch coupling. (arXiv:2312.14735v1 [cond-mat.soft])**

Shengzhu Yi, Hao Chen, Xinyu Wang, Miao Jiang, Bo Li, Qi-huo Wei, Rui Zhang

**Action formalism for geometric phases from self-closing quantum trajectories. (arXiv:2312.14760v1 [quant-ph])**

Dominic Shea, Alessandro Romito

**Evidence for correlated electron pairs and triplets in quantum Hall interferometers. (arXiv:2312.14767v1 [cond-mat.mes-hall])**

Wenmin Yang, David Perconte, Corentin Déprez, Kenji Watanabe, Takashi Taniguchi, Sylvain Dumont, Edouard Wagner, Frédéric Gay, Inès Safi, Hermann Sellier, Benjamin Sacépé

**Enhancement of superconducting transition temperature and exotic stoichiometries in Lu-S system under high pressure. (arXiv:2312.14780v1 [cond-mat.supr-con])**

Juefei Wu, Bangshuai Zhu, Chi Ding, Dexi Shao, Cuiying Pei, Qi Wang, Jian Sun, Yanpeng Qi

**Pressure-induced structure phase transitions and superconductivity in dual topological insulator BiTe. (arXiv:2312.14784v1 [cond-mat.supr-con])**

Shihao Zhu, Bangshuai Zhu, Cuiying Pei, Qi Wang, Jing Chen, Qinghua Zhang, Tianping Ying, Lin Gu, Yi Zhao, Changhua Li, Weizheng Cao, Mingxin Zhang, Lili Zhang, Jian Sun, Yulin Chen, Juefei Wu, Yanpeng Qi

**SuperVortexNet: Reconstructing Superfluid Vortex Filaments Using Deep Learning. (arXiv:2312.14815v1 [cond-mat.quant-gas])**

Nick Keepfer, Thomas Flynn, Nick Parker, Thomas Billam

**The Impact of Local Strain Fields in Non-Collinear Antiferromagnetic Films. (arXiv:2312.14864v1 [cond-mat.mtrl-sci])**

Freya Johnson (1), Frederic Rendell-Bhatti (2), Bryan D. Esser (3), Aisling Hussey (4), David W. McComb (5), Jan Zemen (6), David Boldrin (2), Lesley Cohen (7) ((1) Cavendish Laboratory University of Cambridge, (2) School of Physics and Astronomy University of Glasgow, (3) Monash Centre for Electron Microscopy Monash University, (4) School of Physics Trinity College Dublin, (5) Center for Electron Microscopy and Analysis The Ohio State University, (6) Faculty of Electrical Engineering Czech Technical University in Prague, (7) Blackett Laboratory Imperial College London)

**Untangling the valley structure of states for intravalley exchange anisotropy in lead chalcogenides quantum dots. (arXiv:2312.14918v1 [cond-mat.mes-hall])**

I. D. Avdeev, M. O. Nestoklon

**Topological Green's function zeros in an exactly solved model and beyond. (arXiv:2312.14926v1 [cond-mat.str-el])**

Steffen Bollmann, Chandan Setty, Urban F. P. Seifert, Elio J. König

**Corrections to the reflectance of graphene by light emission. (arXiv:2208.01311v4 [cond-mat.mtrl-sci] UPDATED)**

Ken-ichi Sasaki, Kenichi Hitachi, Masahiro Kamada, Takamoto Yokosawa, Taisuke Ochi, Tomohiro Matsui

**Signatures of many-body localization of quasiparticles in a flat band superconductor. (arXiv:2302.06250v3 [cond-mat.supr-con] UPDATED)**

Koushik Swaminathan, Poula Tadros, Sebastiano Peotta

**Continuous phase transitions between fractional quantum Hall states and symmetry-protected topological states. (arXiv:2302.06501v3 [cond-mat.str-el] UPDATED)**

Ying-Hai Wu, Hong-Hao Tu, Meng Cheng

**Transition to the Haldane phase driven by electron-electron correlations. (arXiv:2304.11154v2 [cond-mat.str-el] UPDATED)**

A. Jażdżewska, M. Mierzejewski, M. Środa, A. Nocera, G. Alvarez, E. Dagotto, J. Herbrych

**Solving optimization problems with local light shift encoding on Rydberg quantum annealers. (arXiv:2308.07798v2 [quant-ph] UPDATED)**

Kapil Goswami, Rick Mukherjee, Herwig Ott, Peter Schmelcher

**Toward a global phase diagram of the fractional quantum anomalous Hall effect. (arXiv:2308.10406v2 [cond-mat.mes-hall] UPDATED)**

Aidan P. Reddy, Liang Fu

**Second-order optical response of superconductors induced by supercurrent injection. (arXiv:2309.14077v3 [cond-mat.supr-con] UPDATED)**

Linghao Huang, Jing Wang

**Non-reciprocity permits edge states and strong localization in stochastic topological phases. (arXiv:2310.16720v2 [cond-mat.stat-mech] UPDATED)**

Aleksandra Nelson, Evelyn Tang

**Gate-tunable topological superconductivity in a supramolecular electron spin lattice. (arXiv:2310.18134v2 [cond-mat.supr-con] UPDATED)**

Rémy Pawlak, Jung-Ching Liu, Chao Li, Richard Hess, Hongyan Chen, Carl Drechsel, Ping Zhou, Robert Häner, Ulrich Aschauer, Thilo Glatzel, Silvio Decurtins, Daniel Loss, Jelena Klinovaja, Shi-Xia Liu, Wulf Wulfhekel, Ernst Meyer

**Observation of an electronic microemulsion phase emerging from a quantum crystal-to-liquid transition. (arXiv:2311.18069v2 [cond-mat.str-el] UPDATED)**

Jiho Sung, Jue Wang, Ilya Esterlis, Pavel A. Volkov, Giovanni Scuri, You Zhou, Elise Brutschea, Takashi Taniguchi, Kenji Watanabe, Yubo Yang, Miguel A. Morales, Shiwei Zhang, Andrew J. Millis, Mikhail D. Lukin, Philip Kim, Eugene Demler, Hongkun Park

Found 1 papers in scipost **Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Holographic Weyl anomaly in string theory, by Lorenz Eberhardt, Sridip Pal**

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Submitted on 2023-12-24, refereeing deadline 2023-12-24.