Found 34 papers in cond-mat We recently showed that spin fluctuations of noncoplanar magnetic states can
induce topological superconductivity in an adjacent normal metal [K. M{\ae}land
et al., Phys. Rev. Lett. 130, 156002 (2023)]. The noncolinear nature of the
spins was found to be essential for this result, while the necessity of
noncoplanar spins was unclear. In this paper we show that magnons in coplanar,
noncolinear magnetic states can mediate topological superconductivity in a
normal metal. Two models of the Dzyaloshinskii-Moriya interaction are studied
to illustrate the need for a sufficiently complicated Hamiltonian describing
the magnetic insulator. The Hamiltonian, in particular the specific form of the
Dzyaloshinskii-Moriya interaction, affects the magnons and by extension the
effective electron-electron interaction in the normal metal. We solve a
linearized gap equation in the case of weak-coupling superconductivity. The
result is a time-reversal-symmetric topological superconductor, as confirmed by
calculating the topological invariant. In analogy with magnon-mediated
superconductivity from antiferromagnets, Umklapp scattering enhances the
critical temperature of superconductivity for certain Fermi momenta.
We investigate interaction-driven integer quantum Hall states realized in
Landau levels of monolayer graphene when two out of its four nearly degenerate
spin-valley flavors are filled. By employing a model that accounts for
interactions beyond pure delta-functions as well as Zeeman and
substrate-induced valley potentials, we demonstrate the existence of a delicate
competition of several phases with spontaneous generation of spin-valley
entanglement, akin to the spontaneous appearance of spin-orbit coupling driven
by interactions. We encounter a particular phase that we term the
entangled-Kekul\'{e}-antiferromagnet (E-KD-AF) which only becomes spin-valley
entangled under the simultaneous presence of Zeeman and substrate potentials,
because it gains energy by simultaneously canting in the spin and valley
spaces, by combining features of a canted anti-ferromagnet and a canted
Kekul\'{e} state. We quantify the degree of spin-valley entanglement of the
many competing phases by computing their bipartite concurrence.
Motivated by recent experimental observation of the quantum spin Hall effect
in monolayer germanene, we study the topological phases of twisted bilayer
Kane-Mele model with time-reversal symmetry and spin $s_z$ conservation. For
large twist angles the helical edge states from the two layers are unstable and
the system is a trivial insulator. At small twist angles however, the emergent
moir\'e flatbands can be topologically nontrivial due to inversion symmetry
breaking from coupling to substrate. Each of these flatbands for each spin
projection admits a lowest-Landau-level description in the chiral limit and at
magic twist angle. This allows for the construction of a many-body Laughlin
state with time-reversal symmetry which can be stabilized by a short-range
pseudopotential, and therefore serves as an ideal platform for realizing the
so-far elusive fractional quantum spin Hall effect with emergent spin-1/2 U(1)
symmetry.
Twisted bilayer graphene (TBG) is known for exhibiting highly correlated
phases at magic angles due to the emergence of flat bands that enhance
electron-electron interactions. In the TBG chiral model, electronic wave
function properties depend on a single parameter ($\alpha$), inversely
proportional to the relative twist angle between the two graphene layers. In
previous studies, as the twist angles approached small values, strong
confinement, and convergence to coherent Landau states were observed. This work
explores flat-band electronic modes, revealing that flat band states exhibit
self-duality; they are coherent Landau states in reciprocal space and exhibit
minimal dispersion, with standard deviation $\sigma_k=\sqrt{3\alpha/2\pi}$ as
$\alpha$ approaches infinity. Subsequently, by symmetrizing the wave functions
and considering the squared TBG Hamiltonian, the strong confinement observed in
the $\alpha\rightarrow\infty$ limit is explained. This confinement arises from
the combination of the symmetrized squared norm of the moir\'e potential and
the quantized orbital motion of electrons, effectively creating a quantum well.
The ground state of this well, located at defined spots, corresponds to Landau
levels with energy determined by the magic angle. Furthermore, we demonstrate
that the problem is physically analogous to an electron attached to a
non-Abelian $SU(2)$ gauge field with an underlying $C_3$ symmetry. In regions
of strong confinement, the system can be considered as Abelian. This allows to
define a magnetic energy in which the important role of the wave function
parity and gap closing at non-magic angles is revealed. Finally, we investigate
the transition from the original non-Abelian nature to an Abelian state by
artificially changing the pseudo-magnetic vector components from an $SU(2)$ to
a $U(1)$ field, which alters the sequence of magic angles.
Cavity embedding is an emerging paradigm for the control of quantum matter,
offering avenues to manipulate electronic states and potentially drive
topological phase transitions. In this work, we address the stability of a
one-dimensional topological superconducting phase to the vacuum quantum
fluctuations brought by a global cavity mode. By employing a quasi-adiabatic
analytical approach completed by density matrix renormalization group
calculations, we show that the Majorana end modes evolve into composite
polaritonic modes while maintaining the topological order intact and robust to
disorder. These Majorana polaritons keep their non-abelian exchange properties
and protect a twofold exponentially degenerate ground state for an open chain.
In this two part series, we present a contact model able to capture the
response of interacting adhesive elastic-perfectly plastic particles under a
variety of loadings. In Part I, we focus on elastic through fully-plastic
contact with and without adhesion. For these contact regimes the model is built
upon the method of dimensionality reduction which allows the problem of a 3D
axisymmetric contact to be mapped to a semi-equivalent problem of a 1D rigid
indenter penetrating a bed of independent Hookean springs. Plasticity is
accounted for by continuously varying the 1D indenter profile subject to a
constraint on the contact pressure. Unloading falls out naturally, and simply
requires lifting the 1D indenter out of the springs and tracking the force. By
accounting for the incompressible nature of this plastic deformation, the
contact model is able to capture multi-neighbor dependent effects such as
increased force and formation of new contacts. JKR type adhesion is recovered
seamlessly within the method of dimensionality reduction by simply allowing the
springs to stick to the 1D indenter's surface. Because of the mechanics-focused
formulation of the contact model, only a few physical inputs describing the
interacting particles are needed: particle radius, Young's modulus, Poisson
ratio, yield stress, and effective surface energy. The contact model is
validated against finite element simulations and analytic theory, including
Hertz's contact law and the JKR theory of adhesion. These comparisons show that
the proposed contact model is able to accurately capture plastic displacement,
average contact pressure, contact area, and force as a function of displacement
for contacts as well as particle volume within the elastic to fully-plastic
regimes.
In recent years, van der Waals (vdW) heterostructures and homostructures,
which consist of stacks of two-dimensional (2D) materials, have risen to
prominence due to their association with exotic quantum phenomena. Atomistic
scale relaxation effects play an extremely important role in the electronic
scale quantum physics of these systems. We investigate such structural
relaxation effects in this work using atomistic and mesoscale models, within
the context of twisted bilayer graphene -- a well-known heterostructure system
that features moire patterns arising from the lattices of the two graphene
layers. For small twist angles, atomic relaxation effects in this system are
associated with the natural emergence of interface dislocations or strain
solitons, which result from the cyclic nature of the generalized stacking fault
energy (GSFE), that measures the interface energy based on the relative
movement of the two layers. In this work, we first demonstrate using atomistic
simulations that atomic reconstruction in bilayer graphene under a large twist
also results from interface dislocations, although the Burgers vectors of such
dislocations are considerably smaller than those observed in small-twist
systems. To reveal the translational invariance of the heterointerface
responsible for the formation of such dislocations, we derive the translational
symmetry of the GSFE of a 2D heterostructure using the notions of coincident
site lattices (CSLs) and displacement shift complete lattices (DSCLs). The
workhorse for this exercise is a recently developed Smith normal form
bicrystallography framework. Next, we construct a bicrystallography-informed
and frame-invariant Frenkel-Kontorova model, which can predict the formation of
strain solitons in arbitrary 2D heterostructures, and apply it to study a
heterostrained, large-twist bilayer graphene system.
Topological insulators have remained as candidates for future electronic
devices since their first experimental realization in the past decade. The
existence of topologically protected edge states could be exploited to generate
a robust platform and develop quantum computers. In this work we explore the
role of magnetic impurities in the transport properties of topological
insulators, in particular, we study the effect on the edge states conductivity.
By means of realistic $\it{ab}$ $\it{initio}$ calculations we simulate the
interaction between magnetic adatoms and topological insulators, furthermore,
our main goal is to obtain the transport properties for large samples as it
would be possible to localize edge states at large scales.
Two-dimensional transition metal dichalcogenides (TMDs) exhibit an extensive
variety of novel electronic properties, such as charge density wave quantum
spin Hall phenomena, superconductivity, and Dirac and Weyl semi-metallic
properties. The diverse properties of TMDs suggest that structural
transformation can be employed to switch between different electronic
properties. Intercalation and zero valence doping of molecules and atoms into
the van der Waals gap of TMDs have emerged as effective approaches to modify
the charge order states of the material. This eventually leads to phase
transition or the formation of different phases, thus expanding the electronic,
thermoelectric and optical applications of these materials. In this study,
electronic and electrochemical energy storage properties of such an
intercalated TMD, namely, 2H-TaSe 2 via intercalation of lithium (Li), sodium
(Na) and potassium (K) have been investigated. The intercalation of these ions
into the dichalcogenide resulted in a modified band structure and novel
structural effects, leading to the emergence of a 1 eV band gap. Possibility of
electrochemical energy storage application is also explored in this study.
Furthermore, the importance of multi orbital electron-electron correlations in
intercalated TaSe 2 is also investigated via dynamical-mean-field theory with
local density approximation.
Active fluids such as bacterial swarms, self-propelled colloids, and cell
tissues can all display complex spatio-temporal vortices that are reminiscent
of inertial turbulence. This emergent behavior despite the overdamped nature of
these systems is the hallmark of active turbulence. In this letter, using a
generalized hydrodynamic model, we present a study of the persistence problem
in active turbulence. We report that the persistence time of passive tracers
inside the coherent vortices follows a Weibull probability density whose shape
and scale are decided by the strength of activity -- contrary to inertial
turbulence that displays power-law statistics in this region. In the turbulent
background, the persistence time is exponentially distributed that is remindful
of inertial turbulence. Finally we show that the driver of persistence inside
the coherent vortices is the temporal decorrelation of the topological field,
whereas it is the vortex turnover time in the turbulent background.
The interplay between chirality and magnetism has been a source of
fascination among scientists for over a century. In recent years,
chirality-induced spin selectivity (CISS) has attracted renewed interest. It
has been observed that electron transport through layers of homochiral
molecules leads to a significant spin polarization of several tens of percent.
Despite the abundant experimental evidence gathered through mesoscopic
transport measurements, the exact mechanism behind CISS remains elusive. In
this study, we report spin-selective electron transport through single helical
aromatic hydrocarbons that were sublimed in vacuo onto ferromagnetic cobalt
surfaces and examined with spin-polarized scanning tunneling microscopy
(SP-STM) at a temperature of 5 K. Direct comparison of two enantiomers under
otherwise identical conditions revealed magnetochiral conductance asymmetries
of up to 50% when either the molecular handedness was exchanged or the
magnetization direction of the STM tip or Co substrate was reversed.
Importantly, our results rule out electron-phonon coupling and ensemble effects
as primary mechanisms responsible for CISS.
In this work, we will study the transmission probability of Dirac fermions
through a double laser barrier. As part of the Floquet approximation, we will
determine the spinors in the five regions. Due to the continuity of the wave
function at the barrier edges, we find eight equations, each with infinity
modes. To simplify, we use the matrix formalism and limit our study to the
first three bands, the central band, and the first two side bands. From the
continuity equation and the spinors in the five regions, we will determine the
current density in each region, which makes it possible to determine the
expression of the transmission probability corresponding to each energy band.
The time-dependent laser fields generate several transmission modes, which give
two transmission processes: transmission with zero photon exchange corresponds
to the central band $\varepsilon$, and transmission with emission or absorption
of photons corresponds to the first two sidebands $\varepsilon\pm\varpi$. One
of the two modes can be suppressed by varying the distance between the two
barriers or the barrier width. The transmission is not permitted if the
incoming energy is below an energy threshold $\varepsilon>k_y+2\varpi$.
Increasing the intensity of the laser fields makes it possible to modify the
sharpness and amplitude of the transmission.
Tunable spin-orbit interaction (SOI) is an important feature for future
spin-based devices. In the presence of a magnetic field, SOI induces an
asymmetry in the energy bands, which can produce non-linear transport effects
($V\sim I^2$). Here, we focus on such effects to study the role of SOI in the
(111) LaTiO$_3$/SrTiO$_3$ interface. This system is a convenient platform for
understanding the role of SOI since it exhibits a single-band Hall-response
through the entire gate-voltage range studied. We report a pronounced rise in
the non-linear resistance at a critical in-plane field $H_{cr}$. This rise
disappears with a small out-of-plane field. We explain these results by
considering the location of the Dirac point formed at the crossing of the
spin-split energy bands. An in-plane magnetic field pushes this point outside
of the Fermi surface, and consequently changes the symmetry of the Fermi
contours and intensifies the non-linear transport. An out-of-plane magnetic
field opens a gap at the Dirac point, thereby significantly diminishing the
non-linear effects. We propose that magnetoresistance effects previously
reported in interfaces with SOI could be comprehended within our suggested
scenario.
We consider a disordered waveguide consisting of trivial dielectric and
non-trivial magnetically anisotropic material. A topologically-protected edge
mode appears owing to the broken time-reversal symmetry of the non-trivial
lattice. While the edge mode maintains under other position and radius
disorders, the protection is immediately broken by applying a radius disorder
to the non-trivial lattice. This breakdown originates from donor and acceptor
modes occupying the topological bandgap. Furthermore, via the calculation of
the Bott index, we show that Anderson localization occurs as a metal conducting
gap changes to a topological gap along with increasing disorders.
The spin-orbit generated $\Gamma$ interaction is known to induce strong
frustration and to be significant in realistic models of materials. To gain an
understanding of the possible phases that can arise from this interaction, it
is of considerable interest to focus on a limited part of parameter space in a
quasi one-dimensional model where high precision numerical results can be
obtained. Here we study the Heisenberg-Gamma (J$\Gamma$) ladder, determining
the complete zero temperature phase diagram by analyzing the entanglement
spectrum (ES) and energy susceptibility. A total of 11 different phases can be
identified. Two of the phases, the antiferromagnetic Gamma (A$\Gamma$) and
ferromagnetic Gamma (F$\Gamma$) phases, have previously been observed in the
Kitaev-Gamma ladder, demonstrating that the A$\Gamma$-phase is a symmetry
protected topological phase (SPT) protected by $TR\times \mathcal{R}_{b}$
symmetry, the product of time-reversal ($TR$) and $\pi$ rotation around the
$b$-axis ($\mathcal{R}_{b}$), while the F$\Gamma$-phase is related to a
rung-singlet phase through a local unitary transformation. Three other phases,
$\Upsilon$, $\Omega$ and $\delta$ show no conventional order, a doubling of the
entanglement spectrum and for the $\Upsilon$ and $\Omega$-phases a gap is
clearly present. The $\delta$-phase has a significantly smaller gap and
displays incommensurate correlations, with a peak in the static structure
factor, $S(k)$ continuously shifting from $k/\pi\mathord{=}2/3$ to
$k\mathord{=}\pi$. In the $\Omega$-phase we find pronounced edge-states
consistent with a SPT phase protected by the same $TR\times \mathcal{R}_{b}$
symmetry as the A$\Gamma$-phase. The precise nature of the $\Upsilon$ and
$\delta$-phases is less clear.
The Benalcazar-Bernevig-Hughes (BBH) quadrupole insulator model is a
cornerstone model for higher-order topological phases. It requires \pi flux
threading through each plaquette of the two-dimensional Su-Schrieffer-Heeger
model. Recent studies show that particular \pi-flux patterns can modify the
fundamental Brillouin zone from the shape of a torus to a Klein-bottle with
emerging topological phases. By designing different \pi-flux patterns, we
propose two types of Klein-bottle BBH models. These models show rich
topological phases including Klein-bottle quadrupole insulators and Dirac
semimetals. The phase with nontrivial Klein-bottle topology shows twined edge
modes at open boundaries. These edge modes can further support second-order
topology yielding a quadrupole insulator. Remarkably, both models are robust
against flux perturbations. Moreover, we show that different \pi-flux patterns
dramatically affect the phase diagram of the Klein-bottle BBH models. Going
beyond the original BBH model, Dirac semimetal phases emerge in Klein-bottle
BBH models featured by the coexistence of twined edge modes and bulk Dirac
points.
The elastic response of mechanical, chemical, and biological systems is often
modeled using a discrete arrangement of Hookean springs, either modeling finite
material elements or even the molecular bonds of a system. However, to date,
there is no direct derivation of the relation between discrete spring network,
and a general elastic continuum. Furthermore, understanding the networks'
mechanical response requires simulations that may be expensive computationally.
Here we report a method to derive the exact elastic continuum model of any
discrete network of springs, requiring network geometry and topology only. We
identify and calculate the so-called "non-affine" displacements. Explicit
comparison of our calculations to simulations of different crystalline and
disordered configurations, shows we successfully capture the mechanics even of
auxetic materials. Our method is valid for residually stressed systems with
non-trivial geometries, is easily generalizable to other discrete models, and
opens the possibility of a rational design of elastic systems.
We propose a theoretical framework that explains how the mass of simple and
higher-order networks emergences from their topology and their geometry. We use
the discrete topological Dirac operator to define an action for a massless
self-interacting topological Dirac field inspired by the Nambu-Jona Lasinio
model.The mass of the network is the result of the chiral symmetry breaking and
satisfies a self-consistent gap equation. Interestingly it is shown that the
mass of a network depends on its spectral properties, topology and geometry.
Due to the breaking of the matter-antimatter symmetry observed for the harmonic
modes of the discrete topological Dirac operator, two possible definitions of
the network mass can be given. For both possible definitions, the mass of the
network comes from a gap equation with the difference among the two definitions
encoded in the value of the bare mass. Indeed the bare mass can be determined
either by the Betti number $\beta_0$ or by the Betti number $\beta_1$ of the
network.We provide numerical results on the mass of different networks,
including random graphs, scale-free and real weighted collaboration networks.
We discuss also the generalization of these results to higher-order networks
defining the mass of simplicial complexes.
When two electrolyte-immersed electrodes have different temperatures, a
voltage $\Delta \psi$ can be measured between them. This electrolyte Seebeck
effect is usually explained by cations and anions flowing differently in
thermal gradients. However, our molecular dynamics simulations of aqueous
electrolytes reveal a large temperature-dependent potential drop $\chi$ near
blocking electrodes caused by water layering and orientation. The difference in
surface potentials at hot and cold electrodes is more important to the Seebeck
effect than ionic thermodiffusion, $\Delta \psi \sim \chi_{\rm hot}-\chi_{\rm
cold}$.
In a lattice model subject to a perpendicular magnetic field, when the
lattice constant is comparable to the magnetic length, one enters the
"Hofstadter regime," where continuum Landau levels become fractal magnetic
Bloch bands. Strong mixing between bands alters the nature of the resulting
quantum phases compared to the continuum limit; lattice potential, magnetic
field, and Coulomb interaction must be treated on equal footing. Using
determinant quantum Monte Carlo (DQMC) and density matrix renormalization group
(DMRG) techniques, we study this regime numerically in the context of the
Hubbard-Hofstadter model on a triangular lattice. In the field-filling phase
diagram, we find a broad wedge-shaped region of ferromagnetic ground states for
filling factor $\nu \lesssim 1$, bounded by incompressible states at filling
factor $\nu = 1$. For magnetic field strengths $\Phi/\Phi_0 \lesssim 0.4$, we
observe signatures of SU(2) quantum Hall ferromagnetism in the lowest magnetic
Bloch band; however, we find no numerical evidence for conventional quantum
Hall skyrmions. At large fields $\Phi/\Phi_0 \gtrsim 0.4$, above the
ferromagnetic wedge, we observe a low-spin metallic region with spin
correlations peaked at small momenta. We argue that the phenomenology of this
region likely results from exchange interaction mixing fractal Hofstadter
subbands. The phase diagram derived beyond the continuum limit points to a rich
landscape to explore interaction effects in magnetic Bloch bands.
We numerically model a two-dimensional active nematic confined by a periodic
array of fixed obstacles. Even in the passive nematic, the appearance of
topological defects is unavoidable due to planar anchoring by the obstacle
surfaces. We show that a vortex lattice state emerges as activity is increased,
and that this lattice may be tuned from ``ferromagnetic'' to
``antiferromagnetic'' by varying the gap size between obstacles. We map the
rich variety of states exhibited by the system as a function of distance
between obstacles and activity, including a pinned defect state, motile
defects, the vortex lattice, and active turbulence. We demonstrate that the
flows in the active turbulent phase can be tuned by the presence of obstacles,
and explore the effects of a frustrated lattice geometry on the vortex lattice
phase.
Open quantum systems provide a plethora of exotic topological phases of
matter that has no Hermitian counterpart. Non-Hermitian skin effect,
macroscopic collapse of bulk states to the boundary, has been extensively
studied in various experimental platforms. However, it remains an open question
whether such topological phases persist in the presence of many-body
interactions. Notably, previous studies have shown that the Pauli exclusion
principle suppresses the skin effect. In this study, we present a compelling
counterexample by demonstrating the presence of the skin effect in
doublon-holon excitations. While the ground state of the spin-half
Hatano-Nelson model shows no skin effect, the doublon-holon pairs, as its
collective excitations, display the many-body skin effect even in strong
coupling limit. We rigorously establish the robustness of this effect by
revealing a bulk-boundary correspondence mediated by the point gap topology
within the many-body energy spectrum. Our findings underscore the existence of
non-Hermitian topological phases in collective excitations of many-body
interacting systems.
We develop an effective quantum electrodynamics for non-Hermitian (NH) Dirac
materials interacting with photons. These systems are described by Lorentz
invariant NH Dirac operators, featuring two velocity parameters $v_{_{\rm H}}$
and $v_{_{\rm NH}}$ associated with the standard Hermitian and a masslike
anti-Hermitian Dirac operators, respectively. They display linear
energy-momentum relation, however, in terms of an effective Fermi velocity
$v_{_{\rm F}}=\sqrt{v^2_{_{\rm H}}-v^2_{_{\rm NH}}}$ of NH Dirac fermions.
Interaction with the fluctuating electromagnetic radiation then gives birth to
an emergent Lorentz symmetry in this family of NH Dirac materials in the deep
infrared regime, where the system possesses a unique terminal velocity
$v_{_{\rm F}}=c$, with $c$ being the speed of light. While in two dimensions
such a terminal velocity is set by the speed of light in the free space,
dynamic screening in three spatial dimensions permits its nonuniversal values.
Manifestations of such an emergent spacetime symmetry on the scale dependence
of various physical observables in correlated NH Dirac materials are discussed.
Recent experiments have demonstrated the possibility to design highly
controllable junctions on magic angle twisted bilayer graphene, enabling the
test of its superconducting transport properties. We show that the presence of
chiral pairing in such devices manifests in the appearance of an anomalous
Josephson effect ($\phi_0$ behavior) even in the case of symmetric junctions
and without requiring any magnetic materials or fields. Such behavior arises
from the combination of chiral pairing and nontrivial topology of the twisted
bilayer graphene band structure that can effectively break inversion symmetry.
Moreover, we show that the $\phi_0$ effect could be experimentally enhanced and
controlled by electrostatic tuning of the junction transmission properties.
We propose a general framework for using local measurements, local unitaries,
and non-local classical communication to construct quantum channels which can
efficiently prepare mixed states with long-range quantum order or quantum
criticality. As an illustration, symmetry-protected topological (SPT) phases
can be universally converted into mixed-states with long-range entanglement,
which can undergo phase transitions with quantum critical correlations of local
operators and a logarithmic scaling of the entanglement negativity, despite
coexisting with volume-law entropy. Within the same framework, we present two
applications using fermion occupation number measurement to convert (i) spinful
free fermions in one dimension into a quantum-critical mixed state with
enhanced algebraic correlations between spins and (ii) Chern insulators into a
mixed state with critical quantum correlations in the bulk. The latter is an
example where mixed-state quantum criticality can emerge from a gapped state of
matter in constant depth using local quantum operations and non-local classical
communication.
Uncovering the physical contents of the nontrivial topology of quantum states
is a critical problem in condensed matter physics. Here, we study the
topological circular dichroism in chiral semimetals using linear response
theory and first-principles calculations. We show that, when the low-energy
spectrum respects emergent SO(3) rotational symmetry, topological circular
dichroism is forbidden for Weyl fermions, and thus is unique to chiral
multifold fermions. This is a result of the selection rule that is imposed by
the emergent symmetry under the combination of particle-hole conjugation and
spatial inversion. Using first-principles calculations, we predict that
topological circular dichroism occurs in CoSi for photon energy below about 0.2
eV. Our work demonstrates the existence of a response property of
unconventional fermions that is fundamentally different from the response of
Dirac and Weyl fermions, motivating further study to uncover other unique
responses.
We consider a quantum ring of a certain radius R built from a sheet of the
$\alpha$-$T_3$ lattice and solve for its spectral properties in presence of an
external magnetic field. The energy spectrum consists of a conduction band, a
valence band and a zero energy flat band, all having a number of discrete
levels therein which can be characterized by the angular momentum quantum
number, m. The energy levels in the flat band are infinitely degenerate
irrespective of the value of $\alpha$. We reveal a two-fold degeneracy of the
levels in the conduction band as well as in the valence band for $\alpha$ = 0
and $\alpha$ = 1. However, the m = 0 level for $\alpha$ = 1 is an exception.
Corresponding to an intermediate value of $\alpha$, namely, 0 <$\alpha$< 1, the
energy levels become nondegenerate. The scenario remains unaltered when the
ring is threaded by a magnetic flux which is an integer multiple of the flux
quantum. We also calculate the persistent current which exhibits quantum
oscillations as a function of the magnetic field with a period of one flux
quantum at a particular Dirac point, which is often referred to as a valley.
The total current oscillates with a periodicity of one flux quantum for any
intermediate value of $\alpha$. We have also explored the effect of a mass term
(that breaks the sublattice symmetry) in the Hamiltonian. In the absence of a
magnetic field, the energy levels in the flat band become dispersive, except
for the m = 0 level in the case of $\alpha$ = 1. In presence of the field, each
of the flat band levels becomes dispersive for any $\alpha \neq$ 0. Finally, we
also see the effect of the mass term on the behaviour of the persistent
current, which shows periodicity of one flux quantum, but the total current
remains finite for all values of $\alpha$.
Magnetic doping of 2D materials such as Transition Metal Dichalcogenides is
promising for the enhancement of magneto-optical properties, as it was
previously observed for 3D diluted magnetic semiconductors. To maximize the
effect of magnetic ions, they should be incorporated into the crystal lattice
of 2D material rather than form separated precipitates. This work shows a study
on incorporating magnetic manganese ions into the MoSe$_2$ monolayers using
molecular beam epitaxy. We test growth on various substrates with very
different properties: polycrystalline SiO$_2$ on Si, exfoliated 2D hexagonal
Boron Nitride flakes (placed on SiO$_2$ / Si), monocrystalline sapphire, and
exfoliated graphite (on tantalum foil). Although atomic force microscopy images
indicate the presence of MnSe precipitates, but at the same time, various
techniques reveal effects related to alloying MoSe$_2$ with Mn: Raman
scattering and photoluminescence measurements show energy shift related to the
presence of Mn, scanning transmission microscopy shows Mn induced partial
transformation of 1H to 1T^\prime phase. Above effects evidence partial
incorporation of Mn into the MoSe$_2$ layer.
This paper focuses on investigating high-order harmonic generation (HHG) in
graphene quantum dots (GQDs) under intense near-infrared laser fields. To model
the GQD and its interaction with the laser field, we utilize a mean-field
approach. Our analysis of the HHG power spectrum reveals fine structures and a
noticeable enhancement in cutoff harmonics due to the long-range correlations.
We also demonstrate the essential role of Coulomb interaction in determining of
harmonics intensities and cutoff position. Unlike atomic HHG, where the cutoff
energy is proportional to the pump wave intensity, in GQDs the cutoff energy
scales with the square root of the field strength amplitude. A detailed
time-frequency analysis of the entire range of HHG spectrum is presented using
a wavelet transform. The analysis reveals intricate details of the spectral and
temporal fine structures of HHG, offering insights into the various HHG
mechanisms in GQDs.
The ferromagnetic metal-superconductor heterostructure with interface Rashba
spin-orbit hopping is a promising candidate for topological superconductivity.
We study the interplay between the interface Rashba hopping and the intrinsic
Dresselhaus spin-orbit coupling in this heterostructure, and demonstrate rich
topological phases with five distinct Chern numbers. In particular, we find a
topological state with a Chern number as large as four in the parameter space
of the heterostructure. We calculate the Berry curvatures that construct the
Chern numbers, and show that these Berry curvatures induce anomalous thermal
Hall transport of the superconducting quasiparticles. We reveal chiral edge
states in the topological phases, as well as helical edge states in the trivial
phase, and show that the wave functions of these edge states mostly concentrate
on the ferrometal layer of the heterostructure.
We develop a non-perturbative framework to incorporate gauge field
fluctuations into QED3 effective actions in the infrared by fermionic
particle-vortex duality. The utility is demonstrated by the application to
models containing N species of 2-component Dirac fermions in a couple of
solvable and interpretable electromagnetic backgrounds: N = 1 or 2. For the N =
1 model, we establish a correspondence between fermion Casimir energy at finite
density and the magnetic Euler-Heisenberg Lagrangian, and we further evaluate
the correction to their amplitudes. This in turn predicts the amplification of
charge susceptibility and the reduction of magnetic permeability. We
additionally supply physical interpretations to each component of our
calculation as well as alternative derivations based on energy density
measurements in different characteristic lengths. For N = 2, we show that the
magnetic catalysis is erased in a U(1)$\times$U(1) QED3 and therefore there is
no breakdown of chiral symmetry. Some reasoning is offered based on the
properties of the lowest Landau level wave functions.
This paper develops approximate message passing algorithms to optimize
multi-species spherical spin glasses. We first show how to efficiently achieve
the algorithmic threshold energy identified in our companion work, thus
confirming that the Lipschitz hardness result proved therein is tight. Next we
give two generalized algorithms which produce multiple outputs and show all of
them are approximate critical points. Namely, in an $r$-species model we
construct $2^r$ approximate critical points when the external field is stronger
than a "topological trivialization" phase boundary, and exponentially many such
points in the complementary regime. We also compute the local behavior of the
Hamiltonian around each. These extensions are relevant for another companion
work on topological trivialization of the landscape.
We study the landscapes of multi-species spherical spin glasses. Our results
determine the phase boundary for annealed trivialization of the number of
critical points, and establish its equivalence with a quenched \emph{strong
topological trivialization} property. Namely in the "trivial" regime, the
number of critical points is constant, all are well-conditioned, and all
approximate critical points are close to a true critical point. As a
consequence, we deduce that Langevin dynamics at sufficiently low temperature
has logarithmic mixing time.
Our approach begins with the Kac--Rice formula. We derive closed form
expressions for some asymptotic determinants studied in (Ben
Arous-Bourgade-McKenna 2023, McKenna 2021), and characterize the annealed
trivialization phase by explicitly solving a suitable multi-dimensional
variational problem. To obtain more precise quenched results, we develop
general purpose techniques to avoid sub-exponential correction factors and show
non-existence of \emph{approximate} critical points. Many of the results are
new even in the $1$-species case.
In recent years, higher-order topological phases have attracted great
interest in various fields of physics. These phases have protected boundary
states at lower-dimensional boundaries than the conventional first-order
topological phases due to the higher-order bulk-boundary correspondence. In
this review, we summarize current research progress on higher-order topological
phases in both crystalline and non-crystalline systems. We firstly introduce
prototypical models of higher-order topological phases in crystals and their
topological characterizations. We then discuss effects of quenched disorder on
higher-order topology and demonstrate disorder-induced higher-order topological
insulators. We also review the theoretical studies on higher-order topological
insulators in amorphous systems without any crystalline symmetry and
higher-order topological phases in nonperiodic lattices including quasicrystals
and hyperbolic lattices, which have no crystalline counterparts. We conclude
the review by a summary of experimental realizations of higher-order
topological phases and discussions on potential directions for future study.

Date of feed: Fri, 15 Sep 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) **Topological superconductivity mediated by magnons of helical magnetic states. (arXiv:2309.07211v1 [cond-mat.supr-con])**

Kristian Mæland, Sara Abnar, Jacob Benestad, Asle Sudbø

**Spin-valley entangled quantum Hall states in graphene. (arXiv:2309.07217v1 [cond-mat.mes-hall])**

Nikolaos Stefanidis, Inti Sodemann Villadiego

**Time-Reversal Invariant Topological Moir\'e Flatband: A Platform for the Fractional Quantum Spin Hall Effect. (arXiv:2309.07222v1 [cond-mat.mes-hall])**

Yi-Ming Wu, Daniel Shaffer, Zhengzhi Wu, Luiz H. Santos

**Self-duality properties and localization centers of the electronic wave functions at high magic angles in twisted bilayer graphene. (arXiv:2309.07260v1 [cond-mat.mes-hall])**

Leonardo A. Navarro-Labastida, Gerardo G. Naumis

**Topological protection of Majorana polaritons in a cavity. (arXiv:2309.07278v1 [cond-mat.mes-hall])**

Zeno Bacciconi, Gian Marcello Andolina, Christophe Mora

**A mechanically-derived contact model for adhesive elastic-perfectly plastic particles. Part I: Utilizing the method of dimensionality reduction. (arXiv:2309.07300v1 [cond-mat.soft])**

William Zunker, Ken Kamrin

**Bicrystallography-informed Frenkel-Kontorova model for interlayer dislocations in strained 2D heterostructures. (arXiv:2309.07325v1 [cond-mat.mes-hall])**

Md Tusher Ahmed, Chenhaoyue Wang, Amartya S. Banerjee, Nikhil Chandra Admal

**Electronic and spin transport in Bismuthene with magnetic impurities. (arXiv:2309.07328v1 [cond-mat.mes-hall])**

Armando Pezo, Felipe Crasto de Lima, Adalberto Fazzio

**Intercalation in 2H-TaSe 2 for modulation of electronic properties and electrochemical energy storage. (arXiv:2309.07543v1 [cond-mat.str-el])**

S. Koley

**Persistence in Active Turbulence. (arXiv:2309.07567v1 [physics.flu-dyn])**

Amal Manoharan, Sanjay CP, Ashwin Joy

**Spin-Selective Electron Transport Through Single Chiral Molecules. (arXiv:2309.07588v1 [cond-mat.mes-hall])**

Mohammad Reza Safari, Frank Matthes, Claus M. Schneider, Karl-Heinz Ernst, Daniel E. Bürgler

**Transmission in graphene through a double laser barrier. (arXiv:2309.07591v1 [cond-mat.mes-hall])**

Rachid El Aitouni, Miloud Mekkaoui, Ahmed Jellal

**Enhanced Non-linear Response by Manipulating the Dirac Point in the (111) LaTiO$_3$/SrTiO$_3$ Interface. (arXiv:2309.07706v1 [cond-mat.str-el])**

G. Tuvia, A. Burshtein, I. Silber, A. Aharony, O. Entin-Wohlman, M. Goldstein, Y. Dagan

**Tolerance and breakdown of topological protection in a disordered waveguide. (arXiv:2309.07710v1 [cond-mat.dis-nn])**

Kiyanoush Goudarzi, Moonjoo Lee

**Eleven Competing Phases in the Heisenberg-Gamma (J$\Gamma$) Ladder. (arXiv:2309.07737v1 [cond-mat.str-el])**

Sebastien J. Avakian, Erik S. Sørensen

**Klein-bottle quadrupole insulators and Dirac semimetals. (arXiv:2309.07784v1 [cond-mat.mes-hall])**

Chang-An Li, Junsong Sun, Song-Bo Zhang, Huaiming Guo, Björn Trauzettel

**Predicting the mechanical properties of spring networks. (arXiv:2309.07844v1 [cond-mat.soft])**

Doron Grossman, Arezki Boudaoud

**The mass of simple and higher-order networks. (arXiv:2309.07851v1 [cond-mat.dis-nn])**

Ginestra Bianconi

**Water, not salt, causes most of the Seebeck effect of nonisothermal aqueous electrolytes. (arXiv:2309.07853v1 [physics.chem-ph])**

Ole Nickel, Ludwig J. V. Ahrens-Iwers, Robert H. Meißner, Mathijs Janssen

**Particle-hole asymmetric ferromagnetism and spin textures in the triangular Hubbard-Hofstadter model. (arXiv:2309.07876v1 [cond-mat.str-el])**

Jixun K. Ding, Luhang Yang, Wen O. Wang, Ziyan Zhu, Cheng Peng, Peizhi Mai, Edwin W. Huang, Brian Moritz, Phillip W. Phillips, Benjamin E. Feldman, Thomas P. Devereaux

**Vortex Lattices in Active Nematics with Periodic Obstacle Arrays. (arXiv:2309.07886v1 [cond-mat.soft])**

Cody D. Schimming, C. J. O. Reichhardt, C. Reichhardt

**Collective non-Hermitian skin effect: Point-gap topology and the doublon-holon excitations in non-reciprocal many-body systems. (arXiv:2309.07894v1 [cond-mat.str-el])**

Beom Hyun Kim, Jae-Ho Han, Moon Jip Park

**Quantum Electrodynamics of Non-Hermitian Dirac Fermions. (arXiv:2309.07916v1 [cond-mat.str-el])**

Sk Asrap Murshed, Bitan Roy

**Intrinsic non-magnetic $\phi_0$ Josephson junctions in twisted bilayer graphene. (arXiv:2303.07738v2 [cond-mat.mes-hall] UPDATED)**

Miguel Alvarado, Pablo Burset, Alfredo Levy Yeyati

**Mixed-state long-range order and criticality from measurement and feedback. (arXiv:2303.15507v2 [cond-mat.str-el] UPDATED)**

Tsung-Cheng Lu, Zhehao Zhang, Sagar Vijay, Timothy H. Hsieh

**Topological Circular Dichroism in Chiral Multifold Semimetals. (arXiv:2303.17553v2 [cond-mat.mes-hall] UPDATED)**

Junyeong Ahn, Barun Ghosh

**Effect of magnetic field on the electronic properties of an $\alpha$-$T_3$ ring. (arXiv:2304.08830v2 [cond-mat.mes-hall] UPDATED)**

Mijanur Islam, Tutul Biswas, Saurabh Basu

**Molecular Beam Epitaxy Growth of Transition Metal Dichalcogenide (Mo,Mn)Se$_2$ on 2D, 3D and polycrystalline substrates. (arXiv:2304.12428v2 [cond-mat.mtrl-sci] UPDATED)**

Julia Kucharek, Rafał Bożek, Wojciech Pacuski

**Long-range correlation-induced effects at high-order harmonic generation on graphene quantum dots. (arXiv:2305.14034v2 [cond-mat.mes-hall] UPDATED)**

H.K. Avetissian, A.G. Ghazaryan, Kh.V. Sedrakian, G.F. Mkrtchian

**Topological superconductivity with large Chern numbers in a ferromagnetic metal-superconductor heterostructure. (arXiv:2307.14838v2 [cond-mat.supr-con] UPDATED)**

Yingwen Zhang, Dao-Xin Yao, Zhi Wang

**Gauge field fluctuation corrected QED3 effective action by fermionic particle-vortex duality. (arXiv:2308.06916v2 [hep-th] UPDATED)**

Wei-Han Hsiao

**Optimization Algorithms for Multi-Species Spherical Spin Glasses. (arXiv:2308.09672v2 [math.PR] UPDATED)**

Brice Huang, Mark Sellke

**Strong Topological Trivialization of Multi-Species Spherical Spin Glasses. (arXiv:2308.09677v2 [math.PR] UPDATED)**

Brice Huang, Mark Sellke

**Higher-order topological phases in crystalline and non-crystalline systems: a review. (arXiv:2309.03688v2 [cond-mat.mes-hall] UPDATED)**

Yan-Bin Yang, Jiong-Hao Wang, Kai Li, Yong Xu

Found 7 papers in prb The $\mathrm{Ni}{(\mathrm{NCS})}_{2}{(\mathrm{pyzdo})}_{2}$ coordination polymer is found to be an $S=1$ spatially anisotropic square lattice with easy-axis single-ion anisotropy. This conclusion is based upon considering in concert the experimental probes x-ray diffraction, magnetic susceptibility,… We present experimental and theoretical studies of the magneto-optical properties of $n$-type ${\mathrm{InAs}}_{x}{\mathrm{P}}_{1−x}$ films in ultrahigh magnetic fields at room temperature. We compare Landau level and band structure calculations with observed cyclotron resonance (CR) measurements an… We use scanning tunneling microscopy to study the temperature evolution of the atomic-scale properties of the nearly commensurate charge density wave (NC-CDW) state of the low-dimensional material $1T\text{−}{\mathrm{TaS}}_{2}$. Our measurements at 203, 300, and 354 K, roughly spanning the temperatu… Scanning tunneling microscopy (STM) and transport measurements have been performed to investigate the electronic structure and its temperature dependence in heavily Sr and Na codoped PbTe, which is recognized as one of the most promising thermoelectric (TE) materials. Our main findings are as follow… The cubic halides K${}_{2}$OsCl${}_{6}$, K${}_{2}$OsBr${}_{6}$, and Rb${}_{2}$OsBr${}_{6}$ are found to be excellent realizations of spin-orbit-entangled nonmagnetic $J$=0 compounds in the intermediate coupling regime. The two complementary techniques of resonant inelastic x-ray scattering and optical spectroscopy allow the authors to draw a comprehensive picture of the electronic excitations and to assess the electronic structure. The accurate set of electronic parameters such as spin-orbit coupling, Hund’s coupling, crystal-field splitting, Mott gap, and charge-transfer energy will serve as a solid reference for future studies on Os compounds. Unlocking the full potential of nanophotonic devices involves the engineering of their intrinsic optical properties. Here, the authors investigate a quantum theory that treats the interaction between quantum-confined plasmons and optical phonons in semiconductors. This theory allows computation of the optical response beyond the conventional Drude-Lorentz model. In particular, it predicts new effects, such as an oscillator-strength transfer mechanism between phonons and dark plasmon modes.

Date of feed: Fri, 15 Sep 2023 03:16:05 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Spatially anisotropic $S=1$ square-lattice antiferromagnet with single-ion anisotropy realized in a Ni(II) pyrazine-$n,{n}^{′}$-dioxide coordination polymer**

Jamie L. Manson, Daniel M. Pajerowski, Jeffrey M. Donovan, Brendan Twamley, Paul A. Goddard, Roger Johnson, Jesper Bendix, John Singleton, Tom Lancaster, Stephen J. Blundell, Jacek Herbrych, Peter J. Baker, Andrew J. Steele, Francis L. Pratt, Isabel Franke-Chaudet, Ross D. McDonald, Alex Plonczak, and Pascal Manuel

Author(s): Jamie L. Manson, Daniel M. Pajerowski, Jeffrey M. Donovan, Brendan Twamley, Paul A. Goddard, Roger Johnson, Jesper Bendix, John Singleton, Tom Lancaster, Stephen J. Blundell, Jacek Herbrych, Peter J. Baker, Andrew J. Steele, Francis L. Pratt, Isabel Franke-Chaudet, Ross D. McDonald, Alex Plonczak, and Pascal Manuel

[Phys. Rev. B 108, 094425] Published Thu Sep 14, 2023

**Anharmonicity and structural phase transition in the Mott insulator ${\mathrm{Cu}}_{2}{\mathrm{P}}_{2}{\mathrm{O}}_{7}$**

Svitlana Pastukh, Paweł T. Jochym, Oleksandr Pastukh, Jan Łażewski, Dominik Legut, and Przemysław Piekarz

Author(s): Svitlana Pastukh, Paweł T. Jochym, Oleksandr Pastukh, Jan Łażewski, Dominik Legut, and Przemysław Piekarz*Ab initio* investigations of the structural, electronic, and dynamical properties of the high-temperature $β$ phase of copper pyrophosphate were performed using density functional theory. The electronic band structure shows the Mott insulating state due to electron correlations in the copper ions. By…

[Phys. Rev. B 108, 104104] Published Thu Sep 14, 2023

**Band structure, $g$-factor, and spin relaxation in $n$-type InAsP alloys**

Sunil K. Thapa, Rathsara R. H. H. Mudiyanselage, Thalya Paleologu, Sukgeun Choi, Zhuo Yang, Y. Kohama, Y. H. Matsuda, Joseph Spencer, Brenden A. Magill, Chris J. Palmstrøm, Christopher J. Stanton, and Giti A. Khodaparast

Author(s): Sunil K. Thapa, Rathsara R. H. H. Mudiyanselage, Thalya Paleologu, Sukgeun Choi, Zhuo Yang, Y. Kohama, Y. H. Matsuda, Joseph Spencer, Brenden A. Magill, Chris J. Palmstrøm, Christopher J. Stanton, and Giti A. Khodaparast

[Phys. Rev. B 108, 115202] Published Thu Sep 14, 2023

**Temperature evolution of domains and intradomain chirality in $1T−{\mathrm{TaS}}_{2}$**

Boning Yu, Ghilles Ainouche, Manoj Singh, Bishnu Sharma, James Huber, and Michael C. Boyer

Author(s): Boning Yu, Ghilles Ainouche, Manoj Singh, Bishnu Sharma, James Huber, and Michael C. Boyer

[Phys. Rev. B 108, 115421] Published Thu Sep 14, 2023

**Experimental verification of band convergence in Sr and Na codoped PbTe**

Yuya Hattori, Shunsuke Yoshizawa, Keisuke Sagisaka, Yuki Tokumoto, Keiichi Edagawa, Takako Konoike, Shinya Uji, and Taichi Terashima

Author(s): Yuya Hattori, Shunsuke Yoshizawa, Keisuke Sagisaka, Yuki Tokumoto, Keiichi Edagawa, Takako Konoike, Shinya Uji, and Taichi Terashima

[Phys. Rev. B 108, 125119] Published Thu Sep 14, 2023

**Electronic excitations in $5{d}^{4}\phantom{\rule{4pt}{0ex}}J=0\phantom{\rule{4pt}{0ex}}{\mathrm{Os}}^{4+}$ halides studied by resonant inelastic x-ray scattering and optical spectroscopy**

P. Warzanowski, M. Magnaterra, P. Stein, G. Schlicht, Q. Faure, Ch. J. Sahle, T. Lorenz, P. Becker, L. Bohatý, M. Moretti Sala, G. Monaco, P. H. M. van Loosdrecht, and M. Grüninger

Author(s): P. Warzanowski, M. Magnaterra, P. Stein, G. Schlicht, Q. Faure, Ch. J. Sahle, T. Lorenz, P. Becker, L. Bohatý, M. Moretti Sala, G. Monaco, P. H. M. van Loosdrecht, and M. Grüninger

[Phys. Rev. B 108, 125120] Published Thu Sep 14, 2023

**Phonon-mediated dark to bright plasmon conversion**

Benjamin Rousseaux, Yanko Todorov, Angela Vasanelli, and Carlo Sirtori

Author(s): Benjamin Rousseaux, Yanko Todorov, Angela Vasanelli, and Carlo Sirtori

[Phys. Rev. B 108, 125417] Published Thu Sep 14, 2023

Found 3 papers in prl New experiments reveal graphene’s exotic phonon spectrum with unprecedented detail and completeness. Uncovering the physical contents of the nontrivial topology of quantum states is a critical problem in condensed matter physics. Here, we study the topological circular dichroism in chiral semimetals using linear response theory and first-principles calculations. We show that, when the low-energy sp… Control of stochastic systems is a challenging open problem in statistical physics, with a wealth of potential applications from biology to granulates. Unlike most cases investigated so far, we aim here at controlling a genuinely out-of-equilibrium system, the two dimensional active Brownian particl…

Date of feed: Fri, 15 Sep 2023 03:16:05 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Direct Observation of Topological Phonons in Graphene**

Jiade Li, Jiangxu Li, Jilin Tang, Zhiyu Tao, Siwei Xue, Jiaxi Liu, Hailin Peng, Xing-Qiu Chen, Jiandong Guo, and Xuetao Zhu

Author(s): Jiade Li, Jiangxu Li, Jilin Tang, Zhiyu Tao, Siwei Xue, Jiaxi Liu, Hailin Peng, Xing-Qiu Chen, Jiandong Guo, and Xuetao Zhu

[Phys. Rev. Lett. 131, 116602] Published Thu Sep 14, 2023

**Topological Circular Dichroism in Chiral Multifold Semimetals**

Junyeong Ahn and Barun Ghosh

Author(s): Junyeong Ahn and Barun Ghosh

[Phys. Rev. Lett. 131, 116603] Published Thu Sep 14, 2023

**Control of Active Brownian Particles: An Exact Solution**

Marco Baldovin, David Guéry-Odelin, and Emmanuel Trizac

Author(s): Marco Baldovin, David Guéry-Odelin, and Emmanuel Trizac

[Phys. Rev. Lett. 131, 118302] Published Thu Sep 14, 2023

Found 1 papers in prx The interaction between a superfluid and an enclosing circular box generates a ring-shaped dark soliton that evolves into a complex vortex structure, showing a novel way of generating structured topological defects.

Date of feed: Fri, 15 Sep 2023 03:16:05 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Observation of Self-Patterned Defect Formation in Atomic Superfluids–from Ring Dark Solitons to Vortex Dipole Necklaces**

Hikaru Tamura, Cheng-An Chen, and Chen-Lung Hung

Author(s): Hikaru Tamura, Cheng-An Chen, and Chen-Lung Hung

[Phys. Rev. X 13, 031029] Published Thu Sep 14, 2023

Found 3 papers in acs-nano

Date of feed: Thu, 14 Sep 2023 13:06:59 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] Isomer Discrimination via Defect Engineering in Monolayer MoS2**

Bin Han, Sai Manoj Gali, Shuting Dai, David Beljonne, and Paolo SamorìACS NanoDOI: 10.1021/acsnano.3c04194

**[ASAP] Highly Durable and Efficient Seawater Electrolysis Enabled by Defective Graphene-Confined Nanoreactor**

Zhichao Gong, Jingjing Liu, Minmin Yan, Haisheng Gong, Gonglan Ye, and Huilong FeiACS NanoDOI: 10.1021/acsnano.3c05749

**[ASAP] Graphene Field Effect Biosensor for Concurrent and Specific Detection of SARS-CoV-2 and Influenza**

Neelotpala Kumar, Dalton Towers, Samantha Myers, Cooper Galvin, Dmitry Kireev, Andrew D. Ellington, and Deji AkinwandeACS NanoDOI: 10.1021/acsnano.3c07707