Found 48 papers in cond-mat By means of density functional theory and constrained random phase
approximation we analyze the bandstructure of Pb$_9$Cu(PO$_4$)$_6$O (named
LK-99). Our data show that the lead-phosphate apatite LK-99 in the proposed
Cu-doped structure is a semiconductor with predominant charge-transfer nature,
a result incompatible with a superconducting behaviour. In order to understand
the interesting electronic and magnetic properties of this compound, it will be
necessary to study the actual response to doping, the possibility of
alternative structural and stoichiometric (dis)orders and to clarify the
magnetic interactions as well as their impact on the electronic structure.
Optical nonlinearities, one of the most fascinating properties of
two-dimensional (2D) materials, are essential for exploring novel physics in 2D
systems and developing next-generation nonlinear optical applications. While
tremendous efforts have been made to discover and optimize second-order
nonlinear optical responses in various 2D materials, higher odd-order nonlinear
processes, which are in general much less efficient than second order ones,
have been paid less attention despite their scientific and applicational
significance. Here we report giant odd-order nonlinear optical wave mixing in a
correlated van der Waals insulator MnPSe3 at room temperature. Illuminated by
two near-infrared femtosecond lasers simultaneously, it generates a series of
degenerate and non-degenerate four- and six-wave mixing outputs, with
conversion efficiencies up to the order of $10^{-4}$ and $10^{-6}$ for the
four- and six-wave mixing processes, respectively, far exceeding the
efficiencies of several prototypical nonlinear optical materials (GaSe,
LiNbO3). This work highlights the intriguing prospect of transition metal
phosphorous trichalcogenides for future research of the nonlinear light matter
interactions in 2D systems and for potential nonlinear photonic applications.
We study the rich dynamics resulting from introducing static charged
particles (Wilson lines) in 2+1 and 3+1 dimensional gauge theories. Depending
on the charges of the external particles, there may be multiple defect fixed
points with interesting renormalization group flows connecting them, or an
exponentially large screening cloud can develop (defining a new emergent length
scale), screening the bare charge entirely or partially. We investigate several
examples where the dynamics can be solved in various weak coupling or double
scaling limits. Sometimes even the elementary Wilson lines, corresponding to
the lowest nontrivial charge, are screened. We consider Wilson lines in 3+1
dimensional gauge theories including massless scalar and fermionic QED$_4$, and
also in the ${\mathcal N}=4$ supersymmetric Yang-Mills theory. We also consider
Wilson lines in 2+1 dimensional conformal gauge theories such as QED$_3$ with
bosons or fermions, Chern-Simons-Matter theories, and the effective theory of
graphene. Our results in 2+1 dimensions have potential implications for
graphene, second-order superconducting phase transitions, etc. Finally, we
comment on magnetic line operators in 3+1 dimensions ('t Hooft lines) and argue
that our results for the infrared dynamics of electric and magnetic lines are
consistent with non-Abelian electric-magnetic duality.
We investigate the existence of higher order topological localized modes in
moir\'{e} lattices of bilayer elastic plates. Each plate has a hexagonal array
of discrete resonators and one of the plates is rotated an angle
($21.78^\circ$) which results in a periodic moir\'{e} lattice with the smallest
area. The two plates are then coupled by inter-layer springs at discrete
locations where the top and bottom plate resonators coincide. Dispersion
analysis using the plane wave expansion method reveals that a bandgap opens on
adding the inter-layer springs. The corresponding topological index, namely
fractional corner mode, for bands below the bandgap predicts the presence of
corner localized modes in a finite structure. Numerical simulations of
frequency response show localization at all corners, consistent with the
theoretical predictions. The considered continuous elastic bilayered moir\'{e}
structures opens opportunities for novel wave phenomena, with potential
applications in tunable energy localization and vibration isolation.
One of the most ancient forms of life dating to ~3.5 billion years ago,
cyanobacteria are highly abundant organisms that convert light into energy and
motion, often within conjoined filaments and larger colonies. We study how
gradients of light intensity trigger orderly phototactic motions and dense
bacterial communities, which remained quantitatively unexplored despite being
among the oldest forms of active living matter on Earth. The phototaxis drives
a transition from initially polar motions of semiflexible long filaments along
complex curved spatiotemporal trajectories confined within illuminated areas to
their bipolar motility in the ensuing crowded environment. We demonstrate how
simply shining light causes a spontaneous self-assembly of two- and
three-dimensional active nematic states of cyanobacterial filaments, with a
plethora of motile and static topological defects. We quantify light-controlled
evolutions of orientational and velocity order parameters during the transition
between disordered and orientationally ordered states of our photosynthetic
active matter, as well as the subsequent active nematic's fluid-gel
transformation. Patterned illumination and foreign inclusions with different
shapes interact with cyanobacterial active nematics in nontrivial ways, while
inducing soft interfacial boundary conditions and quasi-boojum-like defects.
Commanding this cyanobacterial collective behavior could aid inhibiting
generation of toxins or enhancing production of oxygen and biomaterials.
Molecular ferroelectric materials have attracted widespread attention due to
their abundant chemical diversity, structural tunability, low synthesis
temperature, and high flexibility. Meanwhile, the integration of molecular
ferroelectric materials and Si is still challenging, while the fundamental
understanding of the ferroelectric switching process is still lacking. Herein,
we have successfully synthesized the imidazole perchlorate (ImClO4) single
crystals and a series of high-quality highly-oriented thin films on a Si
substrate. A high inverse piezoelectric coefficient (55.7 pm/V) is demonstrated
for the thin films. Two types of domain bands can be observed (in the size of a
few microns): type-I band tilts ~60{\deg} with respect to the horizontal axis,
while the type-II band is perpendicular to the horizontal axis. Most of the
domain walls (DWs) are 180{\deg} DWs for the two bands, while some 109{\deg}
DWs can also be observed. Interestingly, the DWs in type-I band are curved,
charged domain walls; while the 180{\deg} DWs in type-II band are straight,
noncharged domain walls. After applying +20 V for 5 s through a PFM tip, the
180{\deg} DWs in type-I band shrink first, then disconnect from the band
boundary, forming a needle-like domain with a size of ~100 nm. The needle-like
domain will extend toward the band boundary after an inverse bias is applied
(-20 V), and expand along the band boundary after touching the boundary.
Whereas for the type-II domain band, the 180{\deg} DWs are more mobile than the
109{\deg} domain walls, which displaces ~500 nm after applying +20 V. While
such displacement is much shorter after the application of a negative bias for
the same duration, starting from the positively poled sample. We hope to spur
further interest in the on-chip design of the molecular ferroelectrics based
electronic devices.
The Quantum Materials group at Indian Institute of Technology Patna is
working on a range of topics relating to nanoelectronics, spintronics, clean
energy and memory design etc. The PI has past experiences of working
extensively with superconducting systems like cuprates [1, 2], ruthanate [3],
pnictide [4, 5], thin film heterostructures [6, 7] etc and magnetic recording
media [8, 9] etc. In this report, we have summarised the ongoing works in our
group. We explored a range of functional materials like two-dimensional
materials, oxides. topological insulators, organic materials etc. using a
combination of experimnetal and computational tools. Some of the useful
highlights are as follows: (a) tuning and control of the magnetic and
electronic state of 2D magentic materials with rapid enhancement in the Curie
temperature, (b) Design and detection of single electron transistor based
nanosensors for the detection of biological species with single molecular
resolution, (c) Observation of non-volatile memory behaviour in the hybrid
structures made of perovskite materials and 2D hybrids. The results offer
useful insight in the design of nanoelectronic architecrures for diverse
applications.
We propose a comprehensive theoretical formulation of magnetic penetration
depth, $\lambda(T)$, based on the microscopic calculations for a general
superconducting gap symmetry. Our findings admit the significant role of band
structure and Fermi surface topology together with the symmetry of
superconducting order parameter. We employ our findings pertaining to the
heavy-fermion superconductor CeCoIn$_5$ to explore both local and non-local
behaviors in response to an external magnetic field across varying
temperatures. Our calculations in the low-temperature regime offer compelling
macroscopic evidence of the nodal character within the superconducting state
with $d_{x^2-y^2}$ symmetry. Furthermore, our findings align with the
characteristics of London-type superconductivity, holding significant
implications for upcoming experiments.
We used density functional theory to investigate the lateral heteromonolayers
of WTe2 and MoTe2. We confirmed that topologically nontrivial and trivial
phases are energetically favored for the WTe2 and MoTe2 monolayers, taken out
of bulk Td-WTe2 and 2H-MoTe2, respectively. We considered heteromonolayers
consisting of these stable building blocks. In the Td-WTe2 and 2H-MoTe2
heteromonolayers with the interfaces oriented perpendicular to the dimer chains
of W atoms in Td-WTe2 (y direction), two pairs of helical (quantum spin Hall
[QSH]) states, one at each interface, connect the valence and conduction bands.
The strain induced by the large lattice mismatch of the two materials in the y
direction widens the band gap of the QSH insulator of the Td-WTe2 monolayer and
is essential for electronic applications. Furthermore, one-dimensional channels
embedded in the layer can help avoid chemical degradation from the edges and
facilitate the densification of conducting channels. For the heteromonolayer
with interfaces in the x direction, the difference in atomic structure between
the two interfaces due to low symmetry creates an energy difference between two
helical states and a potential gradient in the wide band gap 2H-MoTe2 region,
resulting in various interface localized bands.
It is known that there is also a topological phase in the SSH coupled-spring
system with the fixed-end boundary conditions. When this is the case, there
would exist edge modes on its boundaries. In contrast, if the system satisfies
the free-end boundary conditions, there is no edge mode, even if it is the
topological phase. We show that by varying the force constant of the spring by
the boundary in such a system, edge modes would generally appear independent of
whether the bulk of the system is in the topological or trivial phases.
Moreover, edge modes could exist even if the system satisfies the free-end
boundary conditions.
Diamond-type structure allotrope {\alpha}-Sn is attracting much attention as
a topological Dirac semimetal (TDS). In this study, we demonstrate that
{\alpha}-Sn undergoes a phase transition to another allotrope {\beta}-Sn with
superconductivity at low temperature by irradiating with a focused Ga ion beam
(FIB). To clarify the transition mechanism, we performed X-ray photoemission
spectroscopy (XPS) measurements on an {\alpha}-Sn thin film irradiated with FIB
and an as-grown {\alpha}-Sn thin film. The XPS results suggest that the local
annealing, which is one of the side effects of FIB, causes the transformation
from {\alpha}-Sn into {\beta}-Sn. Furthermore, the difference in the chemical
states between {\alpha}-Sn and {\beta}-Sn can be quantitatively explained by
the crystal structures rather than the degree of metallicity reflecting the
conductivity. These results propose a new way of fabricating TDS/superconductor
in-plane heterostructures based on {\alpha}-Sn and {\beta}-Sn.
At magic twisted angles, Dirac cones in twisted bilayer graphene (TBG) can
evolve into flat bands, serving a critical playground for the study of strongly
correlated physics. When chiral symmetry is introduced, rigorous mathematical
proof confirms that the flat bands are locked at zero energy in the entire
Moir\'{e} Brillouin zone (BZ). Yet, TBG is not the sole platform that exhibits
this absolute band flatness. Central to this flatness phenomenon are
topological nodes and their specific locations in the BZ. In this study,
considering TBSs that preserve chiral symmetry, we classify various ordered
topological nodes in base layers and all possible node locations across
different BZs. Specifically, we constrain the node locations to rotational
centers, such as $\Gamma$ and $\text{M}$ points, to ensure the interlayer
coupling retains equal strength in all directions. Using this classification as
a foundation, we systematically identify the conditions under which MFBs
emerge. Additionally, through the extension of holomorphic functions, we
provide a proof that flat bands are locked at zero energy, shedding light on
the origin of the band flatness. Remarkably, beyond Dirac cones, numerous
twisted bilayer nodal platforms can host the flat bands with the degeneracy
number more than two, such as four-fold, six-fold, and eight-fold. This
multiplicity of degeneracy in flat bands might unveil more complex and enriched
correlation physics.
In this study, we investigate the effect of proximity-induced spin-orbit
coupling (SOC) on Landau levels in graphene-transition metal dichalcogenides
heterostructures. Using a simple theoretical model, we show that the SOC splits
the electronic band in graphene at zero magnetic field that causes Landau level
crossings at finite magnetic fields in quantum Hall regime. In particular, we
find that the crossings among a few low-energy Landau levels sensitively depend
on the strength of the SOC, suggesting that it can be used to estimate the SOC
strengths in the system. To demonstrate this, we present an experimental
signature of such Landau level crosssings and discuss its implications by
comparing the data with calculation results. Our study provides a practical
strategy to analyze Landau level spectrum in graphene with SOC.
This work presents electronic properties of the kagome metal ScV6Sn6 using de
Haas-van Alphen (dHvA) oscillations and density functional theory (DFT)
calculations. The torque signal with the applied fields up to 43 T shows clear
dHvA oscillations with six major frequencies, five of them are below 400 T (low
frequencies) and one is nearly 2800 T (high frequency). The Berry phase
calculated using the Landau level fan diagram near the quantum limit is
approximately {\pi}, which suggests the non-trivial band topology in ScV6Sn6.
To explain the experimental data, we computed the electronic band structure and
Fermi surface using DFT in both the pristine and charge density wave (CDW)
phases. Our results confirm that the CDW phase is energetically favorable, and
the Fermi surface undergoes a severe reconstruction in the CDW state.
Furthermore, the angular dependence of the dHvA frequencies are consistent with
the DFT calculations. The detailed electronic properties presented here are
invaluable for understanding the electronic structure and CDWorder in ScV6Sn6,
as well as in other vanadium-based kagome systems.
Conventional magneto-oscillations of conductivity in three dimensions are
washed out as the temperature exceeds the spacing between the Landau levels.
This is due to smearing of the Fermi distribution. In two dimensions, in the
presence of two or more size-quantization sub-bands, there is an additional
type of magneto-oscillations, usually referred to as magneto-inter-sub-band
oscillations, which do not decay exponentially with temperature. The period of
these oscillations is determined by the condition that the energy separation
between the sub-bands contains an integer number of Landau levels. Under this
condition, which does not contain the Fermi distribution, the inter-sub-band
scattering rate is maximal. Here we show that, with only one sub-band,
high-temperature oscillations are still possible. They develop when the
electron spectrum is split due to the spin-orbit coupling. For these additional
oscillations, the coupling enters both, the period and the decay rate.
Topologically protected edge states arise at the interface of two
topologically distinct valley photonic crystals. In this work, we investigate
how tailoring the interface geometry, specifically from a zigzag interface to a
glide plane, profoundly affects these edge states. Near-field measurements
demonstrate how this transformation significantly changes the dispersion
relation of the edge mode. We observe a transition from gapless edge states to
gapped ones, accompanied by the occurrence of slow light within the Brillouin
zone, rather than at its edge. Additionally, we simulate the propagation of the
modified edge states through a specially designed valley-conserving defect. The
simulations show, by monitoring the transmittance of this defect, how the
robustness to backscattering gradually decreases, suggesting a disruption of
valley-dependent transport. These findings demonstrate how the gradual
emergence of valley-dependent gapless edge states in a valley photonic crystal
depends on the geometry of its interface.
Using a first principles approach, we studied the hydrogen evolution reaction
activity of newly synthesized biphenylene and B, N, P decorated biphenylene
sheet. hydrogen evolution reaction activity of pristine biphenylene sheet is
not encouraging, as it is similar to pristine graphene. The Gibbs free energy
and overpotential of P(N) doped on biphenylene sheet are 0.022 (-0.092) eV and
22 (92) mV, respectively. The reported Gibbs free energy and overpotential of
Pt are 0.9 eV and 90 mV. Hence doping of P(N) atom on top of biphenylene sheet
improves hydrogen evolution reaction activity much better (near to) Pt metal.
We analyzed the adsorption mechanism of dopants (B, N, P) and hydrogen with
Bader charge analysis and density of states analysis. P and N-decoration on
biphenylene sheet change its electronic structure so that one obtains improved
hydrogen evolution reaction activity for P and N-doped biphenylene sheet.
Furthermore, the stability of N, P decorated biphenylene at room temperature
with ab initio molecular dynamics and formation energy near that of biphenylene
indicate experimental feasibility. We have compared all our best hydrogen
evolution reaction activity results in the reaction coordinate and volcano
plots of pristine, B, N, and P-doped BPh sheets. They indicate that P-doped
biphenylene is a metal-free, powerful catalyst for hydrogen evolution reaction
activities.
Understanding the pathways to crystallization during the deposition of a
vapor phase on a cold solid substrate is of great interest in industry, e.g.,
for the realization of electronic devices made of crystallites-free glassy
materials, as well as in the atmospheric science in relation to ice nucleation
and growth in clouds. Here we numerically investigate the nucleation process
during the deposition of a glassformer by using a Lennard-Jones mixture, and
compare the properties of this nucleation process with both its quenched
counterpart and the bulk system. We find that all three systems homogeneously
nucleate crystals in a narrow range of temperatures. However, the deposited
layer shows a peculiar formation of ordered domains, promoted by the faster
relaxation dynamics toward the free surface even in an as-deposited state. In
contrast, the formation of such domains in the other systems occurs only when
the structures are fully relaxed by quenching. Furthermore, the nucleus
initially grows in an isotropic symmetrical manner, but eventually shows sub-3D
growth due to its preference to grow along the basal plane, irrespective of the
layer production procedure.
Ferroelectric quantum spin Hall insulator (FEQSHI) exhibits coexisting
ferroelectricity and time-reversal symmetry protected edge states, holding
fascinating prospects for inviting both scientific and application advances,
especially in two dimensions. However, all of the previously demonstrated
FEQSHIs consist two or more constituent elements. We herein propose the
$\psi$-bismuthene, an uncharted allotrope of bilayer Bi (110), to be the first
example of 2D elemental FEQSHI. It is demonstrated that $\psi$-bismuthene
harbors measurable ferroelectric polarization and nontrivial band gap with
moderate switching barrier, which are highly beneficial for the detection and
observation of the ferroelectric topologically insulating states. In addition,
all-angle auxetic behavior with giant negative Poisson's ratio and
ferroelectric controllable persistent spin helix in $\psi$-bismuthene are also
discussed. The emergent elemental FEQSHI represents a novel domain for both
fundamental physics and technological innovation.
The recently reported Bilinear Magnetoeletric Resistance (BMR) in novel
materials with rich spin textures, such as bismuth selenide (Bi$_2$Se$_3$) and
tungsten ditelluride (WTe$_2$), opens new possibilities for probing the spin
textures via magneto-transport measurements. By its nature, the BMR effect is
directly linked to the crystal symmetry of the materials and its spin texture.
Therefore, understanding the crystallographic dependency of the effect is
crucial. Here we report the observation of crystallographic-dependent BMR in
thin WTe$_2$ layers and explore how it is linked to its spin textures. The
linear response measured in first harmonic signals and the BMR measured in
second harmonic signals are both studied under a wide range of magnitudes and
directions of magnetic field, applied current and at different temperatures. We
discover a three-fold symmetry contribution of the BMR when current is applied
along the a-axis of the WTe$_2$ thin layer at 10 K, which is absent for when
current is applied along the b-axis.
Chirality of massless fermions emergent in condensed matter is a key to
understand their characteristic behavior as well as to exploit their
functionality. However, chiral nature of massless fermions in Dirac semimetals
has remained elusive, due to equivalent occupation of carriers with the
opposite chirality in thermal equilibrium. Here, we show that the isospin
degree of freedom, which labels the chirality of massless carriers from a
crystallographic point of view, can be injected by circularly polarized light.
Terahertz Faraday rotation spectroscopy successfully detects the anomalous Hall
conductivity by a light-induced isospin polarization in a three-dimensional
Dirac semimetal, Cd$_3$As$_2$. Spectral analysis of the Hall conductivity
reveals a long scattering time and a long decay time, which are characteristic
of the isospin. The long-lived, robust, and reversible character of the isospin
promises potential application of Dirac semimetals in future information
technology.
Crystallization of the amorphous phases into metastable crystals plays a
fundamental role in the formation of new matter, from geological to biological
processes in nature to synthesis and development of new materials in the
laboratory. Predicting the outcome of such phase transitions reliably would
enable new research directions in these areas, but has remained beyond reach
with molecular modeling or ab-initio methods. Here, we show that
crystallization products of amorphous phases can be predicted in any inorganic
chemistry by sampling the crystallization pathways of their local structural
motifs at the atomistic level using universal deep learning potentials. We show
that this approach identifies the crystal structures of polymorphs that
initially nucleate from amorphous precursors with high accuracy across a
diverse set of material systems, including polymorphic oxides, nitrides,
carbides, fluorides, chlorides, chalcogenides, and metal alloys. Our results
demonstrate that Ostwald's rule of stages can be exploited mechanistically at
the molecular level to predictably access new metastable crystals from the
amorphous phase in material synthesis.
Two dimensional moir\'e systems have recently emerged as a platform in which
the interplay between topology and strong correlations of electrons play out in
non-trivial ways. Among these systems, twisted double bilayer graphene (TDBG)
is of particular interest as its topological properties may be tuned via both
twist angle and applied perpendicular electric field. In this system, energy
gaps are observed at half filling of particular bands, which can be associated
with correlated spin polarized states. In this work, we investigate the fate of
these states as the system is doped away from this filling. We demonstrate
that, for a broad range of fractional fillings, the resulting ground state is
partially valley polarized, and supports multiple broken symmetries, including
a textured spin order indicative of skyrmions, with a novel $\textit{stripe}$
ordering that spontaneously breaks $C_3$ symmetry. Experimental signatures of
this state are discussed.
Non-Hermitian quasicrystal constitutes a unique class of disordered open
system with PT-symmetry breaking, localization and topological triple phase
transitions. In this work, we uncover the effect of quantum correlation on
phase transitions and entanglement dynamics in non-Hermitian quasicrystals.
Focusing on two interacting bosons in a Bose-Hubbard lattice with
quasiperiodically modulated gain and loss, we find that the onsite interaction
between bosons could drag the PT and localization transition thresholds towards
weaker disorder regions compared with the noninteracting case. Moreover, the
interaction facilitates the expansion of the critical point of a triple phase
transition in the noninteracting system into a critical phase with mobility
edges, whose domain could be flexibly controlled by tuning the interaction
strength. Systematic analyses of the spectrum, inverse participation ratio,
topological winding number, wavepacket dynamics and entanglement entropy lead
to consistent predictions about the correlation-driven phases and transitions
in our system. Our findings pave the way for further studies of the interplay
between disorder and interaction in non-Hermitian quantum matter.
We consider a one-dimensional topological superconductor hosting Majorana
bound states at its ends coupled to a single mode cavity. In the strong
light-matter coupling regime, electronic and photonic degrees of freedom
hybridize resulting in the formation of polaritons. We find the polariton
spectrum by calculating the cavity photon spectral function of the coupled
electron-photon system. In the topological phase the lower in energy polariton
modes are formed by the bulk-Majorana transitions coupled to cavity photons and
are also sensitive to the Majorana parity. In the trivial phase the lower
polariton modes emerge due to the coupling of the bulk-bulk transitions across
the gap to photons. Our work demonstrates the formation of polaritons in
topological superconductors coupled to photons that contain information on the
features of the Majorana bound states.
We re-visit the issue of plasmon damping due to electron-electron
interaction. The plasmon linewidth can related to the imaginary part of the
charge susceptibility or, equivalently, to the real part of the optical
conductivity, $\mathrm{Re}\sigma(q,\omega)$. Approaching the problem first via
a standard semi-classical Boltzmann equation, we show that
$\mathrm{Re}\sigma(q,\omega)$ of two-dimensional (2D) electron gas scales as
$q^2T^2/\omega^4$ for $\omega\ll T$, which agrees with the results of Refs. [1]
and [2] but disagrees with that of Ref. [3], according to which
$\mathrm{Re}\sigma(q,\omega) \propto q^2T^2/\omega^2$. To resolve this
disagreement, we re-derive $\mathrm{Re}\sigma(q,\omega)$ using the original
method of Ref. {mishchenko:2004} for an arbitrary ratio $\omega/T$ and show
that, while the last term is, indeed, present, it is subleading to the
$q^2T^2/\omega^4$ term. We give a physical interpretation of both leading and
subleading contributions in terms of the shear and bulk viscosities of an
electron liquid, respectively. We also calculate $\mathrm{Re}\sigma(q,\omega)$
for a three-dimensional (3D) electron gas and doped monolayer graphene. We find
that, with all other parameters being equal, finite temperature has the
strongest effect on the plasmon linewidth in graphene, where it scales as
$T^4\ln T$ for $\omega\ll T$.
Over the last few years, crystalline topology has been used in photonic
crystals to realize edge- and corner-localized states that enhance light-matter
interactions for potential device applications. However, the band-theoretic
approaches currently used to classify bulk topological crystalline phases
cannot predict the existence, localization, or spectral isolation of any
resulting boundary-localized modes. While interfaces between materials in
different crystalline phases must have topological states at some energy, these
states need not appear within the band gap, and thus may not be useful for
applications. Here, we derive a class of local markers for identifying material
topology due to crystalline symmetries, as well as a corresponding measure of
topological protection. As our real-space-based approach is inherently local,
it immediately reveals the existence and robustness of topological
boundary-localized states, yielding a predictive framework for designing
topological crystalline heterostructures. Beyond enabling the optimization of
device geometries, we anticipate that our framework will also provide a route
forward to deriving local markers for other classes of topology that are
reliant upon spatial symmetries.
The spin-orbit coupling plays an important role in the spin Hall effect and
the topological insulators. In addition, the spin-orbit coupled Bose-Einstein
condensates show remarkable quantum many-body phase transition. In this work we
tune the exciton polariton condensate by virtue of the Rashba-Dresselhaus (RD)
spin-orbit coupling in a liquid-crystal filled microcavity where perovskite
CsPbBr3 microplates act as the gain material at room temperature. We realize an
artificial gauge field on the CsPbBr3 exciton polariton condensate, which
splits the condensates with opposite spins in both momentum and real spaces.
Our work paves the way to manipulate the exciton polariton condensate with a
synthetic gauge field based on the RD spin-orbit coupling at room temperature.
Magnetic anisotropies often originate from the spin-orbit coupling and
determine magnetic ordering patterns. We develop a microscopic theory for DC
electric-field controls of magnetic anisotropies in magnetic Mott insulators
and discuss its applications to Kitaev materials and topological spin textures.
Throughout this paper, we take a microscopic approach based on Hubbard-like
lattice models, tight-binding models with on-site interactions. We derive a
low-energy spin Hamiltonian from a fourth-order perturbation expansion of the
Hubbard-like model. We show in the presence of a strong intra-atomic spin-orbit
coupling that DC electric fields add non-Kitaev interactions such as a
Dzyaloshinskii-Moriya interaction and an off-diagonal $\Gamma'$ interaction to
the Kitaev-Heisenberg model and can induce a topological quantum phase
transition between Majorana Chern insulating phases. We also investigate the
inter-atomic Rashba spin-orbit coupling and its effects on topological spin
textures. DC electric fields turn out to create and annihilate magnetic
skyrmions, hedgehogs, and chiral solitons. We propose several methods of
creating topological spin textures with external electromagnetic fields. Our
theory clarifies that the strong but feasible electric field can control Kitaev
spin liquids and topological spin textures.
Advanced thermostats for molecular dynamics are proposed on the base of the
rigorous Langevin dynamics. Because the latter accounts for the subsystem-bath
interactions in details, the bath anisotropy and nonuniformity are described
via the relevant friction tensor. The developed model reflects properly the
relativistic dynamics of the subsystem evolution as well as the nonlinear
friction, which can occur for fast particles with large momenta at elevated
temperature.
Semiconductor artificial graphene nanostructures where Hubbard model
parameter $U/t$ can be of the order of 100, provide a highly controllable
platform to study strongly correlated quantum many-particle phases. We use
accurate variational and diffusion Monte Carlo methods to demonstrate a
transition from antiferromagnetic to metallic phases for experimentally
accessible lattice constant $a=50$ nm in terms of lattice site radius $\rho$,
for finite sized artificial honeycomb structures nanopatterned on GaAs quantum
wells containing up to 114 electrons. By analysing spin-spin correlation
functions for hexagonal flakes with armchair edges and triangular flakes with
zigzag edges, we show that edge type, geometry and charge nonuniformity affect
the steepness and the crossover $\rho$ value of the phase transition. For
triangular structures, the metal-insulator transition is accompanied with a
smoother edge polarization transition.
We propose and theoretically investigate a novel Maxwell's demon
implementation based on the spin-momentum locking property of topological
matter. We use nuclear spins as a memory resource which provides the advantage
of scalability. We show that this topological information device can ideally
operate at the Landauer limit; the heat dissipation required to erase one bit
of information stored in the demon's memory approaches $k_B T\ln2$.
Furthermore, we demonstrate that all available energy, $k_B T\ln2$ per one bit
of information, can be extracted in the form of electrical work. Finally, we
find that the current-voltage characteristics of topological information device
satisfy the conditions of an ideal memristor.
Electrochemical energy storage always involves the capacitive process. The
prevailing electrode model used in the molecular simulation of polarizable
electrode-electrolyte systems is the Siepmann-Sprik model developed for perfect
metal electrodes. This model has been recently extended to study the
metallicity in the electrode by including the Thomas-Fermi screening length.
Nevertheless, a further extension to heterogeneous electrode models requires
introducing chemical specificity, which does not have any analytical recipes.
Here, we address this challenge by integrating the atomistic machine learning
code (PiNN) for generating the base charge and response kernel and the
classical molecular dynamics code (MetalWalls) dedicated to the modeling of
electrochemical systems, and this leads to the development of the PiNNwall
interface. Apart from the cases of chemically doped graphene and graphene oxide
electrodes as shown in this study, the PiNNwall interface also allows us to
probe polarized oxide surfaces in which both the proton charge and the
electronic charge can coexist. Therefore, this work opens the door for modeling
heterogeneous and complex electrode materials often found in energy storage
systems.
Atomically thin van der Waals magnetic materials have not only provided a
fertile playground to explore basic physics in the two-dimensional (2D) limit
but also created vast opportunities for novel ultrafast functional devices.
Here we systematically investigate ultrafast magnetization dynamics and spin
wave dynamics in few-layer topological antiferromagnetic MnBi2Te4 crystals as a
function of layer number, temperature, and magnetic field. We find
laser-induced (de)magnetization processes can be used to accurately track the
distinct magnetic states in different magnetic field regimes, including showing
clear odd-even layer number effects. In addition, strongly field-dependent
antiferromagnetic magnon modes with tens of gigahertz frequencies are optically
generated and directly observed in the time domain. Remarkably, we find that
magnetization and magnon dynamics can be observed in not only the time-resolved
magneto-optical Kerr effect but also the time resolved reflectivity, indicating
strong correlation between the magnetic state and electronic structure. These
measurements present the first comprehensive overview of ultrafast spin
dynamics in this novel 2D antiferromagnet, paving the way for potential
applications in 2D antiferromagnetic spintronics and magnonics as well as
further studies of ultrafast control of both magnetization and topological
quantum states.
Resistive memory based on 2D WS2, MoS2, and h-BN materials has been studied,
including experiments and simulations. The influences with different active
layer thicknesses have been discussed, including experiments and simulations.
The thickness with the best On/Off ratio is also found for the 2D RRAM. This
work reveals fundamental differences between a 2D RRAM and a conventional oxide
RRAM. Furthermore, from the physical parameters extracted with the KMC model,
the 2D materials have a lower diffusion activation energy from the vertical
direction, where a smaller bias voltage and a shorter switching time can be
achieved. It was also found the diffusion activation energy from the CVD-grown
sample is much lower than the mechanical exfoliated sample. The result shows
MoS2 has the fastest switching speed among three 2D materials.
Rhombohedral stacked multilayer graphene is an ideal platform to search for
correlated electron phenomena, due to its pair of flat bands touching at zero
energy and further tunability by an electric field. Furthermore, its
valley-dependent Berry phase at zero energy points to possible topological
states when the pseudospin symmetry is broken by electron correlation. However,
experimental explorations of these opportunities are very limited so far, due
to a lack of devices with optimized layer numbers and configurations. Here we
present electron transport measurements of hBN-encapsulated pentalayer graphene
at down to 100 milli-Kelvin. We observed a correlated insulating state with
>MOhm resistance at zero charge density and zero displacement field, where the
tight-binding calculation predicts a metallic ground state. By increasing the
displacement field, we observed a Chern insulator state with C = -5 and two
other states with C = -3 at a low magnetic field of ~1 Tesla. At high
displacement fields and charge densities, we observed isospin-polarized
quarter- and half-metals. Therefore, rhombohedral-stacked pentalayer graphene
is the first graphene system to exhibit two different types of Fermi-surface
instabilities: driven by a pair of flat bands touching at zero energy, and by
the Stoner mechanism in a single flat band. Our results demonstrate a new
direction to explore intertwined electron correlation and topology phenomena in
natural graphitic materials without the need of moir\'e superlattice
engineering.
Microwave impedance microscopy (MIM) is a near-field imaging technique that
has been used to visualize the local conductivity of materials with nanoscale
resolution across the GHz regime. In recent years, MIM has shown great promise
for the investigation of topological states of matter, correlated electronic
states and emergent phenomena in quantum materials. To explore these low-energy
phenomena, many of which are only detectable in the milliKelvin regime, we have
developed a novel low-temperature MIM incorporated into a dilution
refrigerator. This setup which consists of a tuning-fork-based atomic force
microscope with microwave reflectometry capabilities, is capable of reaching
temperatures down to 70 mK during imaging and magnetic fields up to 9 T. To
test the performance of this microscope, we demonstrate microwave imaging of
the conductivity contrast between graphite and silicon dioxide at cryogenic
temperatures and discuss the resolution and noise observed in these results. We
extend this methodology to visualize edge conduction in Dirac semimetal cadmium
arsenide in the quantum Hall regime
We predict the magnetic and electronic properties of a novel metal-organic
framework. By combining density functional theory and density matrix
renormalization group approaches, we find the diatomic Kagome crystal structure
of the metal-semiquinoid framework (H$_2$NMe$_2$)$_2$M$_2$(Cl$_2$dhbq)$_3$ (M =
Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn) to host a rich variety of
antiferromagnetic (AFM) and ferromagnetic (FM) Dirac semimetallic,
spin-polarized Dirac fermions, and flat band magnetic insulators and metallic
phases. Concomitantly, the spin excitation spectrum of the various magnetic
systems display multiple Dirac-like and nodal-ring crossings. This suggests
that the metal-semiquinoid system is an ideal platform for examining the
intertwining of Dirac fermions and magnons.
A Boussinesq system for a non-linear shallow water is considered. The
nonlinear and topological effects are examined through an associated matrix
spectral problem. It is shown an equivalence relationship between the bound
states and topological soliton charge densities which resembles a formula of
the Atiyah-Patodi-Singer-type index theorem. The zero mode components describe
a topologically protected Kelvin wave of KdV-type and a novel Boussinesq-type
field. We show that either the $1+1$ dimensional pKdV kink or the Kelvin mode
can be mapped to the bulk velocity potential in $2+1$ dimensions.
With the help of scanning tunneling microscopy (STM) it has become possible
to address single magnetic impurities on superconducting surfaces and to
investigate the peculiar properties of the in-gap states known as
Yu-Shiba-Rusinov (YSR) states. However, until very recently YSR states were
only investigated with conventional tunneling spectroscopy, missing the crucial
information contained in other transport properties such as shot noise. Here,
we adapt the concept of full counting statistics (FCS) to provide a very deep
insight into the spin-dependent transport in these hybrid systems. We
illustrate the power of FCS by analyzing different situations in which YSR
states show up including single-impurity junctions, as well as double-impurity
systems where one can probe the tunneling between individual YSR states. The
FCS concept allows us to unambiguously identify every tunneling process that
plays a role in these situations. Moreover, FCS provides all the relevant
transport properties, including current, shot noise and all the cumulants of
the current distribution. Our approach can reproduce the experimental results
recently reported on the shot noise of a single-impurity junction with a normal
STM tip. We also predict the signatures of resonant (and non-resonant) multiple
Andreev reflections in the shot noise of single-impurity junctions with two
superconducting electrodes. In the case of double-impurity junctions we show
that the direct tunneling between YSR states is characterized by a strong
reduction of the Fano factor that reaches a minimum value of 7/32, a new
fundamental result in quantum transport. The FCS approach presented here can be
naturally extended to investigate the spin-dependent superconducting transport
in a variety of situations, and it is also suitable to analyze multi-terminal
superconducting junctions, irradiated contacts, and many other basic
situations.
We demonstrate that the low temperature ($T$) properties of a class of
anisotropic spin $S=1$ kagome (planar pyrochlore) antiferromagnets on a
field-induced $\frac{1}{3}$-magnetization ($\frac{1}{2}$-magnetization) plateau
are described by a model of fully-packed dimers and loops on the honeycomb
(square) lattice, with a temperature-dependent relative fugacity $w(T)$ for the
dimers. The fully-packed O(1) loop model ($w=0$) and the fully-packed dimer
model ($w=\infty$) limits of this dimer-loop model are found to be separated by
a phase transition at a finite and nonzero critical fugacity $w_c$, with
interesting consequences for the spin correlations of the frustrated magnet.
The $w>w_c$ phase has short loops and spin correlations dominated by power-law
columnar order (with subdominant dipolar correlations), while the $w<w_c$ phase
has dominant dipolar spin correlations and long loops governed by a power-law
distribution of loop sizes. Away from $w_c$, both phases are described by a
long-wavelength Gaussian effective action for a scalar height field that
represents the coarse-grained electrostatic potential of fluctuating dipoles.
The destruction of power-law columnar spin order below $w_c$ is driven by an
unusual {\em flux fractionalization} mechanism, topological in character but
quite distinct from the usual Kosterlitz-Thouless mechanism for such
transitions: Fractional electric fluxes which are bound into integer values for
$w>w_c$, proliferate in the $w<w_c$ phase and destroy power-law columnar order.
The spatial structure of the inhomogeneity in a disordered medium determines
how waves scatter and propagate in it. We present a theoretical model of how
the Fourier components of the disorder control wave scattering in a
two-dimensional disordered medium, by analyzing the disordered Green's function
for scalar waves. By selecting a set of Fourier components with the appropriate
wave vectors, we can enhance or suppress wave scattering to filter out unwanted
waves and allow the robust coherent transmission of waves at specific angles
and wavelengths through the disordered medium. Based on this principle, we
propose an approach for creating selective transparency, band gaps and
anisotropy in disordered media. This approach is validated by direct numerical
simulations of coherent wave transmission over a wide range of incident angles
and frequencies and can be experimentally realized in disordered photonic
crystals. Our approach, which requires neither nontrivial topological wave
properties nor a non-Hermitian medium, creates opportunities for exploring a
broad range of wave phenomena in disordered systems.
We study universal traits which emerge both in real-world complex datasets,
as well as in artificially generated ones. Our approach is to analogize data to
a physical system and employ tools from statistical physics and Random Matrix
Theory (RMT) to reveal their underlying structure. We focus on the
feature-feature covariance matrix, analyzing both its local and global
eigenvalue statistics. Our main observations are: (i) The power-law scalings
that the bulk of its eigenvalues exhibit are vastly different for uncorrelated
normally distributed data compared to real-world data, (ii) this scaling
behavior can be completely modeled by generating gaussian data with long range
correlations, (iii) both generated and real-world datasets lie in the same
universality class from the RMT perspective, as chaotic rather than integrable
systems, (iv) the expected RMT statistical behavior already manifests for
empirical covariance matrices at dataset sizes significantly smaller than those
conventionally used for real-world training, and can be related to the number
of samples required to approximate the population power-law scaling behavior,
(v) the Shannon entropy is correlated with local RMT structure and eigenvalues
scaling, and substantially smaller in strongly correlated datasets compared to
uncorrelated synthetic data, and requires fewer samples to reach the
distribution entropy. These findings show that with sufficient sample size, the
Gram matrix of natural image datasets can be well approximated by a Wishart
random matrix with a simple covariance structure, opening the door to rigorous
studies of neural network dynamics and generalization which rely on the data
Gram matrix.
Ferroic orders describe spontaneous polarization of spin, charge, and lattice
degrees of freedom in materials. Materials featuring multiple ferroic orders,
known as multiferroics, play important roles in multi-functional electrical and
magnetic device applications. 2D materials with honeycomb lattices offer
exciting opportunities to engineer unconventional multiferroicity, where the
ferroic orders are driven purely by the orbital degrees of freedom but not
electron spin. These include ferro-valleytricity corresponding to the electron
valley and ferro-orbital-magnetism supported by quantum geometric effects. Such
orbital multiferroics could offer strong valley-magnetic couplings and large
responses to external fields-enabling device applications such as
multiple-state memory elements, and electric control of valley and magnetic
states. Here we report orbital multiferroicity in pentalayer rhombohedral
graphene using low temperature magneto-transport measurements. We observed
anomalous Hall signals Rxy with an exceptionally large Hall angle (tan{\Theta}H
> 0.6) and orbital magnetic hysteresis at hole doping. There are four such
states with different valley polarizations and orbital magnetizations, forming
a valley-magnetic quartet. By sweeping the gate electric field E we observed a
butterfly-shaped hysteresis of Rxy connecting the quartet. This hysteresis
indicates a ferro-valleytronic order that couples to the composite field E\cdot
B, but not the individual fields. Tuning E would switch each ferroic order
independently, and achieve non-volatile switching of them together. Our
observations demonstrate a new type of multiferroics and point to electrically
tunable ultra-low power valleytronic and magnetic devices.
Helicity is a fundamental property of Dirac fermions. Yet, the general rule
of how it changes in transport is still lacking. We uncover, theoretically, the
universal spinor state transformation and consequently helicity redistribution
rule in two cases of transport through potentials of electrostatic and mass
types, respectively. The former is dictated by Lorentz boost and its complex
counterpart in Klein tunneling regime, which establishes miraculously a unified
yet latent connection between helicity, Klein tunneling, and Lorentz boost. The
latter is governed by an abstract rotation group we construct, which reduces to
SO(2) when acting on the plane of effective mass and momentum. They generate
invariant submanifolds, i.e., leaves, that foliate the Hilbert space of Dirac
spinors. Our results provide a basis for unified understanding of helicity
transport, and may open a new window for exotic helicity-based physics and
applications in mesoscopic systems.
We consider as a model of Weyl semimetal thermoelectric transport a
$(3+1)$-dimensional charged, relativistic and relaxed fluid with a $U(1)_{V}
\times U(1)_{A}$ chiral anomaly. We take into account all possible mixed
energy, momentum, electric and chiral charge relaxations, and discover which
are compatible with electric charge conservation, Onsager reciprocity and a
finite DC conductivity. We find that all relaxations respecting these
constraints necessarily render the system open and violate the second law of
thermodynamics. We then demonstrate how the relaxations we have found arise
from kinetic theory and a modified relaxation time approximation. Our results
lead to DC conductivities that differ from those found in the literature
opening the path to experimental verification.
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-order nonlinear optical conductivity $\sigma^{(2)}(\omega)$ at the gap
edge $2\hbar\omega=2\Delta$ and $\hbar\omega=2\Delta$, which diverge in the
clean limit. We demonstrate this in the models of single-band superconductor
with $s$-wave and $d$-wave pairings, and Dirac fermion systems with $s$-wave
pairing. Our theory predicts the current induced peak in
$\text{Im}[\sigma^{(2)}(\omega)]$ is proportional to 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)]. The supercurrent induced
nonlinear optical spectroscopy provides a valuable toolbox to explore novel
superconductors.
In this paper, we investigate different thermodynamic properties of
$T\bar{T}+J\bar{T }$ deformed 2D-gravity. First, we compute the partition
function of $U(1)$ coupled 2D-gravity with fixed chemical potential, obtained
from the dimensional reduction of the four-dimensional Einstein-Maxwell theory.
Then, we compute the partition function of the deformed theory and study the
genus expansion of the one and two-point correlation function of the partition
function of the theory. Subsequently, we use the one-point function to compute
the ``Annealed'' and ``Quenched'' free energy in low-temperature limits and
make a qualitative comparison with the undeformed theory. Then, using the
two-point function, we compute the Spectral Form Factor of the deformed theory
in early and late time. We find a dip and ramp structure in early and late
time, respectively. We also get a plateau structure in the $\tau$-scaling
limit. Last but not least, we comment on the late-time topology change to give
a physical interpretation of the ramp of the Spectral Form Factor for our
theory.

Date of feed: Tue, 03 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) **Pb$_9$Cu(PO$_4$)$_6$O is a charge-transfer semiconductor. (arXiv:2310.00006v1 [cond-mat.mtrl-sci])**

Lorenzo Celiberti, Lorenzo Varrassi, Cesare Franchini

**Giant nonlinear optical wave mixing in van der Waals compound MnPSe3. (arXiv:2310.00026v1 [physics.optics])**

Li Yue, Chang Liu, Shanshan Han, Hao Hong, Yijun Wang, Qiaomei Liu, Jiajie Qi, Yuan Li, Dong Wu, Kaihui Liu, Enge Wang, Tao Dong, Nanlin Wang

**Phases of Wilson Lines: Conformality and Screening. (arXiv:2310.00045v1 [hep-th])**

Ofer Aharony, Gabriel Cuomo, Zohar Komargodski, Márk Mezei, Avia Raviv-Moshe

**Topological Localized Modes In Moir\'{e} Lattices of Bilayer Elastic Plates With Resonators. (arXiv:2310.00182v1 [cond-mat.mes-hall])**

Tamanna Akter Jui, Raj Kumar Pal

**Photosynthetically-powered phototactic active nematic fluids and gels. (arXiv:2310.00203v1 [cond-mat.soft])**

Andrii Repula, Colin Gates, Jeffrey C. Cameron, Ivan I. Smalyukh

**A molecular Ferroelectric thin film of imidazolium perchlorate on Silicon. (arXiv:2310.00439v1 [cond-mat.mtrl-sci])**

Congqin Zheng, Xin Li, Yuhui Huang, Yongjun Wu, Zijian Hong

**Quantum Materials Group Annual Report 2022. (arXiv:2310.00456v1 [cond-mat.mes-hall])**

P. Kumari, S. Rani, S. Kar, T. Mukherjee, S. Majumder, K. Kumari, S. J. Ray

**Microscopic Insights into London Penetration Depth: Application to CeCoIn$^{}_{5}$. (arXiv:2310.00499v1 [cond-mat.supr-con])**

Mehdi Biderang, Jeehoon Kim, Reza Molavi, Alireza Akbari

**Quantum spin Hall states in the lateral heteromonolayers of WTe2-MoTe2. (arXiv:2310.00515v1 [cond-mat.mtrl-sci])**

Mari Ohfuchi, Akihiko Sekine

**{SSH coupled-spring systems. (arXiv:2310.00547v1 [cond-mat.other])**

Jie-Ying Kuo, Tsung-Yen Lee, Yi-Chia Chiu, Sheng-Rong Liao, Hsien-chung Kao

**Allotropic transition of Dirac semimetal {\alpha}-Sn to superconductor {\beta}-Sn induced by irradiation of focused ion beam. (arXiv:2310.00652v1 [cond-mat.mtrl-sci])**

Kohdai Inagaki, Keita Ishihara, Tomoki Hotta, Yuichi Seki, Takahito Takeda, Tatsuhiro Ishida, Daiki Ootsuki, Ikuto Kawasaki, Shin-ichi Fujimori, Masaaki Tanaka, Le Duc Anh, Masaki Kobayashi

**Classification of High-Ordered Topological Nodes Towards MFBs in Twisted Bilayers. (arXiv:2310.00662v1 [cond-mat.str-el])**

Fan Cui, Congcong Le, Qiang Zhang, Xianxin Wu, Jiangping Hu, Ching-Kai Chiu

**Low-energy Landau levels in monolayer graphene with proximity-induced spin-orbit coupling. (arXiv:2310.00686v1 [cond-mat.mes-hall])**

Qing Rao, Hongxia Xue, Dong-Keun Ki

**Electronic properties of kagome metal ScV6Sn6 using high field torque magnetometry. (arXiv:2310.00751v1 [cond-mat.str-el])**

Keshav Shrestha, Binod Regmi, Ganesh Pokharel, Seong-Gon Kim, Stephen D. Wilson, David E. Graf, Birendra A. Magar, Cole Phillips, Thinh Nguyen

**High-temperature magneto-inter-chirality oscillations in 2D systems with strong spin-orbit coupling. (arXiv:2310.00774v1 [cond-mat.mes-hall])**

M.E. Raikh

**Impact of transforming interface geometry on edge states in valley photonic crystals. (arXiv:2310.00858v1 [physics.optics])**

Di Yu, Sonakshi Arora, L. Kuipers

**Improving Hydrogen evolution catalytic activity of 2D carbon allotrope Biphenylene with B, N, P doping: Density Functional Theory Investigations. (arXiv:2310.00932v1 [cond-mat.mtrl-sci])**

Mukesh Singh, Alok Shukla, Brahmananda Charkraborty

**Crystal nucleation in a vapor deposited Lennard-Jones mixture. (arXiv:2310.01021v1 [cond-mat.soft])**

Fabio Leoni, Hajime Tanaka, John Russo

**Elemental Ferroelectric Topological Insulator in $\psi$-bismuthene. (arXiv:2310.01027v1 [cond-mat.mtrl-sci])**

Yan Liang, Xuening Han, Thomas Frauenheim, Fulu Zheng, Pei Zhao

**Crystallographic-dependent bilinear magnetoelectric resistance in a thin WTe$_2$ layer. (arXiv:2310.01058v1 [cond-mat.mes-hall])**

Tian Liu, Arunesh Roy, Jan Hidding, Homayoun Jafari, Dennis K. de Wal, Jagoda Slawinska, Marcos H. D. Guimarães, Bart J. van Wees

**Anomalous Hall transport by optically injected isospin degree of freedom in Dirac semimetal thin film. (arXiv:2310.01093v1 [cond-mat.mes-hall])**

Yuta Murotani, Natsuki Kanda, Tomohiro Fujimoto, Takuya Matsuda, Manik Goyal, Jun Yoshinobu, Yohei Kobayashi, Takashi Oka, Susanne Stemmer, Ryusuke Matsunaga

**Predicting emergence of crystals from amorphous matter with deep learning. (arXiv:2310.01117v1 [cond-mat.mtrl-sci])**

Muratahan Aykol, Amil Merchant, Simon Batzner, Jennifer N. Wei, Ekin Dogus Cubuk

**Skyrmion stripes in twisted double bilayer graphene. (arXiv:2310.01185v1 [cond-mat.mes-hall])**

Debasmita Giri, Dibya Kanti Mukherjee, H.A. Fertig, Arijit Kundu

**Correlation-induced phase transitions and mobility edges in a non-Hermitian quasicrystal. (arXiv:2310.01275v1 [quant-ph])**

Tian Qian, Longwen Zhou

**Hybrid light-matter states in topological superconductors coupled to cavity photons. (arXiv:2310.01296v1 [cond-mat.mes-hall])**

Olesia Dmytruk, Marco Schirò

**Optical conductivity and damping of plasmons due to electron-electron interaction. (arXiv:2310.01337v1 [cond-mat.str-el])**

Prachi Sharma, Alessandro Principi, Giovanni Vignale, Dmitrii L. Maslov

**Local markers for crystalline topology. (arXiv:2310.01398v1 [physics.optics])**

Alexander Cerjan, Terry A. Loring, Hermann Schulz-Baldes

**Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature. (arXiv:2108.02057v2 [cond-mat.quant-gas] UPDATED)**

Yao Li, Xuekai Ma, Xiaokun Zhai, Meini Gao, Haitao Dai, Stefan Schumacher, Tingge Gao

**Electric-field control of magnetic anisotropies: applications to Kitaev spin liquids and topological spin textures. (arXiv:2110.06503v3 [cond-mat.str-el] UPDATED)**

Shunsuke C. Furuya, Masahiro Sato

**Advanced Thermostats for Molecular Dynamics. (arXiv:2205.06608v3 [cond-mat.stat-mech] UPDATED)**

Roumen Tsekov

**Quantum Monte Carlo Study of Semiconductor Artificial Graphene Nanostructures. (arXiv:2210.14696v3 [cond-mat.mes-hall] UPDATED)**

Gökhan Öztarhan, E. Bulut Kul, Emre Okcu, A. D. Güçlü

**Topological information device operating at the Landauer limit. (arXiv:2212.14862v2 [cond-mat.mes-hall] UPDATED)**

A. Mert Bozkurt, Alexander Brinkman, İnanç Adagideli

**PiNNwall: Heterogeneous Electrode Models from Integrating Machine Learning and Atomistic Simulation. (arXiv:2303.15307v4 [cond-mat.mtrl-sci] UPDATED)**

Thomas Dufils, Lisanne Knijff, Yunqi Shao, Chao Zhang

**Real-time observation of magnetization and magnon dynamics in a two-dimensional topological antiferromagnet MnBi2Te4. (arXiv:2304.09390v2 [cond-mat.mes-hall] UPDATED)**

F. Michael Bartram, Meng Li, Liangyang Liu, Zhiming Xu, Yongchao Wang, Mengqian Che, Hao Li, Yang Wu, Yong Xu, Jinsong Zhang, Shuo Yang, Luyi Yang

**Studies of two-dimensional material resistive random-access memory by kinetic Monte Carlo simulations. (arXiv:2304.11345v2 [cond-mat.mtrl-sci] UPDATED)**

Ying-Chuan Chen, Yu-Ting Chao, Edward Chen, Chao-Hsin Wu, Yuh-Renn Wu

**Correlated Insulator and Chern Insulators in Pentalayer Rhombohedral Stacked Graphene. (arXiv:2305.03151v2 [cond-mat.mes-hall] UPDATED)**

Tonghang Han, Zhengguang Lu, Giovanni Scuri, Jiho Sung, Jue Wang, Tianyi Han, Kenji Watanabe, Takashi Taniguchi, Hongkun Park, Long Ju

**MilliKelvin microwave impedance microscopy in a dry dilution refrigerator. (arXiv:2305.03757v2 [physics.app-ph] UPDATED)**

Leonard Weihao Cao, Chen Wu, Rajarshi Bhattacharyya, Ruolun Zhang, Monica T. Allen

**Coexistence of Dirac Fermions and Magnons in a Layered Two-Dimensional Semiquinoid Metal-Organic Framework. (arXiv:2305.03867v2 [cond-mat.str-el] UPDATED)**

Christopher Lane, Yixuan Huang, Jian-Xin Zhu

**Zero mode-soliton duality and pKdV kinks in Boussinesq system for non-linear shallow water waves. (arXiv:2305.04037v2 [hep-th] UPDATED)**

H. Blas, Ronal A. DeLaCruz-Araujo, N. I. Reynaldo Jr., N. Santos, S. Tech, H.E.P. Cardoso

**Full Counting Statistics of Yu-Shiba-Rusinov Bound States. (arXiv:2305.04758v2 [cond-mat.mes-hall] UPDATED)**

David Christian Ohnmacht, Wolfgang Belzig, Juan Carlos Cuevas

**Flux fractionalization transition in anisotropic $S=1$ antiferromagnets and dimer-loop models. (arXiv:2305.07012v2 [cond-mat.stat-mech] UPDATED)**

Souvik Kundu, Kedar Damle

**Control of wave scattering for robust coherent transmission in a disordered medium. (arXiv:2305.07831v3 [physics.optics] UPDATED)**

Zhun-Yong Ong

**The Underlying Scaling Laws and Universal Statistical Structure of Complex Datasets. (arXiv:2306.14975v2 [cs.LG] UPDATED)**

Noam Levi, Yaron Oz

**Orbital Multiferroicity in Pentalayer Rhombohedral Graphene. (arXiv:2308.08837v2 [cond-mat.mes-hall] UPDATED)**

Tonghang Han, Zhengguang Lu, Giovanni Scuri, Jiho Sung, Jue Wang, Tianyi Han, Kenji Watanabe, Takashi Taniguchi, Liang Fu, Hongkun Park, Long Ju

**Symmetry dictated universal helicity redistribution of Dirac fermions in transport. (arXiv:2309.02474v2 [cond-mat.mes-hall] UPDATED)**

Jun-Yin Huang, Rui-Hua Ni, Hong-Ya Xu, Liang Huang

**Relaxation terms for anomalous hydrodynamic transport in Weyl semimetals from kinetic theory. (arXiv:2309.05692v2 [hep-th] UPDATED)**

Andrea Amoretti, Daniel K. Brattan, Luca Martinoia, Ioannis Matthaiakakis, Jonas Rongen

**Second-order optical response of superconductors induced by supercurrent injection. (arXiv:2309.14077v2 [cond-mat.supr-con] UPDATED)**

Linghao Huang, Jing Wang

**Aspects of $T\bar{T}+J\bar{T }$ deformed 2D topological gravity : from partition function to late-time SFF. (arXiv:2309.16658v2 [hep-th] UPDATED)**

Arpan Bhattacharyya, Saptaswa Ghosh, Sounak Pal

Found 5 papers in prb Coupling of excitations, arising from electronic correlation or electron-phonon interaction, leads to intriguing effects on the spectra of materials. Current approximations to calculate photoluminescence spectra most often describe this coupling insufficiently. Starting from basic equations of many-… We employ the determinant quantum Monte Carlo method to study the finite-temperature properties of the half-filled attractive $\mathrm{SU}(3)$ Hubbard model on a honeycomb lattice. We calculate the phase diagram in which the phase boundary separates the disordered phase and the charge density wave (… The manipulation process of a single CO molecule on a copper single crystal by a metallic tip is studied here using noncontact atomic force microscopy, with dissipation energy detection, vibrational spectroscopy, and density functional theory calculations. The manipulation of the CO molecule between the two adjacent top sites is found to occur via an intermediate state of CO on the bridging site. Furthermore, this finding allows for the interpretation of static and dynamic friction at the atomic scale. We investigate the Rashba effect in thermodynamically stable nonpolar transition metal dichalcogenide (TMD) alloys of the form $\mathrm{Mo}{\mathrm{S}}_{2(1−x)}{\mathrm{Se}}_{2x}$ in the presence of an out-of-plane electric field using first-principles calculations. These alloys exhibit a nonlinear … First-principles-based effective Hamiltonian simulations are used to reveal the hidden connection between various topological defects, namely point defects and skyrmions, in copper oxide selenite (${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$). Using this approach, we show that (i) ${\mathrm{Cu}}_{2}{\math…

Date of feed: Tue, 03 Oct 2023 03:17:07 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) **Dynamical effects on photoluminescence spectra from first principles: A many-body Green's function approach**

Pierluigi Cudazzo

Author(s): Pierluigi Cudazzo

[Phys. Rev. B 108, 165101] Published Mon Oct 02, 2023

**Quantum Monte Carlo simulations of thermodynamic properties of attractive $\mathrm{SU}(3)$ Dirac fermions**

Xiang Li, Han Xu, and Yu Wang

Author(s): Xiang Li, Han Xu, and Yu Wang

[Phys. Rev. B 108, 165102] Published Mon Oct 02, 2023

**Energy dissipation of a carbon monoxide molecule manipulated using a metallic tip on copper surfaces**

Norio Okabayashi, Thomas Frederiksen, Alexander Liebig, and Franz J. Giessibl

Author(s): Norio Okabayashi, Thomas Frederiksen, Alexander Liebig, and Franz J. Giessibl

[Phys. Rev. B 108, 165401] Published Mon Oct 02, 2023

**Tunable nonlinear anisotropic Rashba splitting in monolayer transition metal dichalcogenide $\mathrm{Mo}{\mathrm{S}}_{2(1−x)}{\mathrm{Se}}_{2x}$ alloys**

Souvick Chakraborty and Satyabrata Raj

Author(s): Souvick Chakraborty and Satyabrata Raj

[Phys. Rev. B 108, 165402] Published Mon Oct 02, 2023

**Skyrmion lattice annihilation by point defects in the multiferroic ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$**

Houssam Sabri and Igor Kornev

Author(s): Houssam Sabri and Igor Kornev

[Phys. Rev. B 108, L140401] Published Mon Oct 02, 2023

Found 1 papers in prl The interplay of the nonequivalent corners in the Brillouin zone of transition metal dichalcogenides (TMDCs) has been investigated extensively. While experimental and theoretical works contributed to a detailed understanding of the relaxation of selective optical excitations and the related relaxati…

Date of feed: Tue, 03 Oct 2023 03:17:08 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) **Impact of Optically Pumped Nonequilibrium Steady States on Luminescence Emission of Atomically Thin Semiconductor Excitons**

Manuel Katzer, Malte Selig, Dominik Christiansen, Mariana V. Ballottin, Peter C. M. Christianen, and Andreas Knorr

Author(s): Manuel Katzer, Malte Selig, Dominik Christiansen, Mariana V. Ballottin, Peter C. M. Christianen, and Andreas Knorr

[Phys. Rev. Lett. 131, 146201] Published Mon Oct 02, 2023

Found 1 papers in acs-nano

Date of feed: Mon, 02 Oct 2023 13:07:51 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] Direct Electrochemical Functionalization of Graphene Grown on Cu Including the Reaction Rate Dependence on the Cu Facet Type**

Minhyeok Kim, Se Hun Joo, Meihui Wang, Sergey G. Menabde, Da Luo, Sunghwan Jin, Hyeongjun Kim, Won Kyung Seong, Min Seok Jang, Sang Kyu Kwak, Sun Hwa Lee, and Rodney S. RuoffACS NanoDOI: 10.1021/acsnano.3c04138