Found 28 papers in cond-mat In the paper "Life, the Universe, and everything-42 fundamental questions",
Roland Allen and Suzy Lidstr\"om presented personal selection of the
fundamental questions. Here, based on the condensed matter experience, we
suggest the answers to some questions concerning the vacuum energy, black hole
entropy and the origin of gravity.
We study the competition between the electron liquid and solid phases, such
as Wigner crystal and bubbles, in partially filled Landau levels (LLs) of
multilayer graphene. Graphene systems offer a versatile platform for
controlling band dispersion by varying the number of its stacked layers. The
band dispersion determines the LL wave functions, and consequently, the
LL-projected Coulomb interaction in graphene and its multilayers is different
from that in conventional semiconductors like GaAs. As a result, the energies
of the liquid and solid phases are different in the different LLs of multilayer
graphene, leading to a new phase diagram for the stability of these phases,
which we work out. The phase diagram of competing solid and liquid phases in
the LLs of monolayer graphene has been studied previously. Here, we primarily
consider $AB{-}$ or Bernal$-$stacked bilayer graphene (BLG) and $ABC{-}$stacked
trilayer graphene (TLG) and focus on the Laughlin fractions. We determine the
cohesive energy of the solid phase using the Hartree-Fock approximation while
the energy of the Laughlin liquid is computed analytically via the plasma sum
rules. We find that at the Laughlin fillings, the electron liquid phase has the
lowest energy among the phases considered in the $\mathcal{N}{=}0, 1, 2$ LLs of
BLG, as well as in the $\mathcal{N}{=}3, 4$ LLs of TLG, while in the
$\mathcal{N}{>}2$ LLs of BLG and $\mathcal{N}{>}4$ LLs of TLG, the solid phases
are more favorable. We also discuss the effect of impurities on the
above-mentioned phase diagram.
Stacking bilayer structures is an efficient way to tune the topology of
polaritons in in-plane anisotropic films, e.g., by leveraging the twist angle
(TA). However, the effect of another geometric parameter, film thickness ratio
(TR), on manipulating the plasmon topology in bilayers is elusive. Here, we
fabricate bilayer structures of WTe2 films, which naturally host in-plane
hyperbolic plasmons in the terahertz range. Plasmon topology is successfully
modified by changing the TR and TA synergistically, manifested by the
extinction spectra of unpatterned films and the polarization dependence of the
plasmon intensity measured in skew ribbon arrays. Such TR- and TA-tunable
topological transitions can be well explained based on the effective sheet
optical conductivity by adding up those of the two films. Our study
demonstrates TR as another degree of freedom for the manipulation of plasmonic
topology in nanophotonics, exhibiting promising applications in bio-sensing,
heat transfer and the enhancement of spontaneous emission.
We unveil a hitherto concealed spin-orbit torque mechanism driven by orbital
degrees of freedom in centrosymmetric two-dimensional transition metal
dichalcogenides (focusing on PtSe${}_2$ ). Using first-principles simulations,
tight-binding models and large-scale quantum transport calculations, we show
that such a mechanism fundamentally stems from a spatial localization of
orbital textures at opposite sides of the material, which imprints their
symmetries onto spin-orbit coupling effects, further producing efficient and
tunable spin-orbit torque. Our study suggests that orbital-spin entanglement at
play in centrosymmetric materials can be harnessed as a resource for
outperforming conventional spin-orbit torques generated by the Rashba-type
effects.
Spins in semiconductor quantum dots hold great promise as building blocks of
quantum processors. Trapping them in SiMOS transistor-like devices eases future
industrial scale fabrication. Among the potentially scalable readout solutions,
gate-based dispersive radiofrequency reflectometry only requires the already
existing transistor gates to readout a quantum dot state, relieving the need
for additional elements. In this effort towards scalability, traveling-wave
superconducting parametric amplifiers significantly enhance the readout
signal-to-noise ratio (SNR) by reducing the noise below typical cryogenic
low-noise amplifiers, while offering a broad amplification band, essential to
multiplex the readout of multiple resonators. In this work, we demonstrate a
3GHz gate-based reflectometry readout of electron charge states trapped in
quantum dots formed in SiMOS multi-gate devices, with SNR enhanced thanks to a
Josephson traveling-wave parametric amplifier (JTWPA). The broad, tunable 2GHz
amplification bandwidth combined with more than 10dB ON/OFF SNR improvement of
the JTWPA enables frequency and time division multiplexed readout of interdot
transitions, and noise performance near the quantum limit. In addition, owing
to a design without superconducting loops and with a metallic ground plane, the
JTWPA is flux insensitive and shows stable performances up to a magnetic field
of 1.2T at the quantum dot device, compatible with standard SiMOS spin qubit
experiments.
The dislocation skin effect exhibits the capacity of topological defects to
trap an extensive number of modes in two-dimensional non-Hermitian systems.
Similar to the corresponding skin effects caused by system boundaries, this
phenomenon also originates from nontrivial topology. However, finding the
relationship between the dislocation skin effect and nonzero topological
invariants, especially in disordered systems, can be obscure and challenging.
Here, we introduce a real-space topological invariant based on the spectral
localizer to characterize the skin effect on two-dimensional lattices. We
demonstrate that this invariant consistently predicts the occurrence and
location of both boundary and dislocation skin effects, offering a unified
approach applicable to both ordered and disordered systems. Our work
demonstrates a general approach that can be utilized to diagnose the
topological nature of various types of skin effects, particularly in the
absence of translational symmetry when momentum-space descriptions are
inapplicable.
Zigzag nanoribbons hosting the Haldane Chern insulator model are considered.
In this context, an unreported reentrant topological phase, characterized by
the emergence of quasi zero dimensional in-gap states, is discussed. The bound
states, which reside in the gap opened by the hybridization of the
counter-propagating edge modes of the Haldane phase, are localized at the ends
of the strip and are found to be robust against on-site disorder. These
findings are supported by the behavior of the Zak phase over the parameter
space, which exhibits jumps of $\pi$ in correspondence to the phase transitions
between the trivial and the non-trivial phases. Setups with non-uniform
parameters also show topological bound states via the Jackiw-Rebbi mechanism.
All the properties reported are shown to be extremely sensitive to the strip
width.
In this work we use a phenomenological theory of ferroelectric switching in
BiFeO$_3$ thin films to uncover the mechanism of the two-step process that
leads to the reversal of the weak magnetization of these materials. First, we
introduce a realistic model of a BiFeO$_3$ film, including the Landau energy of
isolated domains as well as the constraints that account for the presence of
the substrate and the multidomain configuration found experimentally. We use
this model to obtain statistical information about the switching behavior - by
running dynamical simulations based on the Landau-Khalatnikov time-evolution
equation, including thermal fluctuations - and we thus identify the factors
that drive the two-step polarization reversal observed in the experiments.
Additionally, we apply our model to test potential strategies for optimizing
the switching characteristics.
Solution-processed few-layers graphene flakes, dispensed to rotating and
sliding contacts via liquid dispersions, are gaining increasing attention as
friction modifiers to achieve low friction and wear at technologically-relevant
interfaces. Vanishing friction states, i.e. superlubricity, have been
documented for nearly-ideal nanoscale contacts lubricated by individual
graphene flakes; there is however no clear understanding if superlubricity
might persist for larger and morphologically-disordered contacts, as those
typically obtained by graphene wet transfer from a liquid dispersion. In this
study we address the friction performance of solution-processed graphene flakes
by means of colloidal probe Atomic Force Microscopy. We use an additive-free
aqueous dispersion to coat micrometric silica beads, which are then sled under
ambient conditions against prototypical material substrates, namely graphite
and the transition metal dichalcogenides (TMDs) MoS2 and WS2. High resolution
microscopy proves that the random assembly of the wet-transferred flakes over
the silica probes results into an inhomogeneous coating, formed by graphene
patches that control contact mechanics through tens-of-nanometers tall
protrusions. Atomic-scale friction force spectroscopy reveals that dissipation
proceeds via stick-slip instabilities. Load-controlled transitions from
dissipative stick-slip to superlubric continuous sliding may occur for the
graphene-graphite homojunctions, whereas single- and multiple-slips dissipative
dynamics characterizes the graphene-TMD heterojunctions. Systematic numerical
simulations demonstrate that the thermally-activated single-asperity
Prandtl-Tomlinson model comprehensively describes friction experiments
involving different graphene-coated colloidal probes, material substrates and
sliding regimes.
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 consider non-Hermitian energy band theory in two-dimensional systems, and
study eigenenergy braids on slices in the two-dimensional Brillouin zone. We
show the consequences of reciprocity and geometric symmetry on such eigenenergy
braids. The point-gap topology of the energy bands can be found from the
projection of the eigenenergy braid onto the complex energy plane. We show that
the conjugacy class transitions in the eigenenergy braid results in the changes
in the number of bands in a complete point-gap loop. This transition occurs at
exceptional points. We numerically demonstrate these concepts using
two-dimensional reciprocal and nonreciprocal photonic crystals.
The intrinsically superconducting Dirac semimetal 2M-WS$_{2}$ is a promising
candidate to realize proximity-induced topological superconductivity in its
protected surface states. A precise characterization of the bulk
superconducting state is essential for understanding the nature of surface
superconductivity in the system. Here, we perform a detailed experimental study
of the temperature and nonmagnetic disorder dependence of the London
penetration depth $\lambda$, the upper critical field $H_{c2}$, and the
superconducting transition temperature $T_c$ in 2M-WS$_{2}$. We observe a
power-law dependence $\lambda(T) - \lambda(0) \propto T^{3}$ at temperatures
below $0.35~T_c$, which is remarkably different from the expected exponential
attenuation of a fully gapped isotropic $s$-wave superconductor. We then probe
the effect of controlled nonmagnetic disorder induced by 2.5 MeV electron
irradiation at various doses and find a significant $T_c$ suppression rate.
Together with the observed increase of the slope $dH_{c2}/dT|_{T=T_c}$ with
irradiation, our results reveal a strongly anisotropic $s^{++}$ multiband
superconducting state that takes the same sign on different Fermi sheets. Our
results have direct consequences for the expected proximity-induced
superconductivity of the topological surface states.
Disclinations or disclination clusters in smectic C freely suspended films
with topological charges larger than one are unstable. They disintegrate,
preferably in a spatially symmetric fashion, into single defects with
individual charges +1, which is the smallest positive topological charge
allowed in polar vector fields. While the opposite process of defect
annihilation is well-defined by the initial defect positions, a disintegration
starts from a singular state and the following scenario including the emerging
regular defect patterns must be selected by specific mechanisms. We analyze
experimental data and compare them with a simple model where the defect
clusters adiabatically pass quasi-equilibrium solutions in one-constant
approximation. It is found that the defects arrange in geometrical patterns
that correspond very closely to superimposed singular defect solutions, without
additional director distortions. The patterns expand by affine transformations
where all distances between individual defects scale with the same
time-dependent scaling factor proportional to the square-root of time.
We present a method to probe the topological properties of a circuit quantum
electrodynamics (cQED) array described through a Haldane model on the honeycomb
lattice. We develop the theory of microwave light propagating in a local probe
or a microscope (a one-dimensional transmission line) capacitively coupled to
the topological cQED lattice model. Interestingly, we show that even if the
microwave light has no transverse polarization, the measured reflection
coefficient, resolved in frequency through the resonance, allows us to reveal
the geometrical properties and topological phase transition associated to the
model. This spectroscopy tool developed for cQED lattice models reveals the
same topological information as circularly polarized light, locally within the
Brillouin zone of the honeycomb lattice. Furthermore, our findings hold
significance for topological magnon systems and are a priori applicable to all
Chern insulators, presenting an intriguing opportunity for their adaptation to
other systems with different particle statistics.
Quasicrystals allow for symmetries that are impossible in crystalline
materials, such as eight-fold rotational symmetry, enabling the existence of
novel higher-order topological insulators in two dimensions without crystalline
counterparts. However, it remains an open question whether three-dimensional
higher-order topological insulators and Weyl-like semimetals without
crystalline counterparts can exist. Here, we demonstrate the existence of a
second-order topological insulator by constructing and exploring a
three-dimensional model Hamiltonian in a stack of Ammann-Beenker tiling
quasicrystalline lattices. The topological phase has eight chiral hinge modes
that lead to quantized longitudinal conductances of $4 e^2/h$. We show that the
topological phase is characterized by the winding number of the quadrupole
moment. We further establish the existence of a second-order topological
insulator with time-reversal symmetry, characterized by a $\mathbb{Z}_2$
topological invariant. Finally, we propose a model that exhibits a higher-order
Weyl-like semimetal phase, demonstrating both hinge and surface Fermi arcs. Our
findings highlight that quasicrystals in three dimensions can give rise to
higher-order topological insulators and semimetal phases that are unattainable
in crystals.
An ensemble of massless fermions can be characterized by its total helicity
charge given by the sum of axial charges of particles minus the sum of axial
charges of anti-particles. We show that charged massless fermions develop a
dissipationless flow of helicity along the background magnetic field. We dub
this transport phenomenon as the Helical Separation Effect (HSE). Contrary to
its chiral cousin, the Chiral Separation Effect, the HSE produces the helical
current in a neutral plasma in which all chemical potentials vanish. In
addition, we uncover the Helical Magnetic Heat Effect which generates the heat
flux of Dirac fermions along the magnetic field in the presence of
non-vanishing helical charge density. We also discuss possible hydrodynamic
modes associated with the HSE in neutral plasma.
We predict energetically and dynamically stable ternary
Carbon-Phosphorous-Arsenic (CPAs2) monolayers in buckled geometric structure by
employing density functional theory based calculations. We consider three
different symmetric configurations, namely, inversion (i), mirror (m) and
rotational (r). The low-energy dispersions in electronic band structure and
density of states (DOS) around the Fermi level contain two contrasting
features: (a) parabolic dispersion around highly symmetric Gamma point with a
step function in DOS due to nearly-free-particle-like Schroedinger-Fermions and
(b) linear dispersion around highly symmetric K point with linear DOS due to
massless Dirac-Fermions for i-CPAs2 monolayer. The step function in DOS is a
consequence of two-dimensionality of the system in which the motion of
nearly-free-particles is confined. However, a closer look at (b) reveals that
the ternary monolayers possess distinct characters, namely (i)
massless-gapless, (ii) slightly massive-gapped and (iii) unpinned
massless-gapless Dirac-Fermions for i, m and r-CPAs2 configurations
respectively. Thus, the nature of states around the Fermi level depends
crucially on the symmetry of systems. In addition, we probe the influence of
mechanical strain on the properties of CPAs2 monolayer. The results indicate
that the characteristic dispersions of (a) and (b) move in opposite directions
in energy which leads to a metal-to-semimetal transition in i and r-CPAs2
configurations, for a few percentages of tensile strain. On the other hand, a
strain induced metal-to-semiconductor transition is observed in m-CPAs2
configuration with a tunable energy band gap. Interestingly, unlike graphene,
the Dirac cones can be unpinned from highly symmetric K (and K') point, but
they are restricted to move along the edges (K-M'-K') of first Brillouin zone
due to C2 symmetry in i and r-CPAs2 configurations.
We present PolyHoop, a lightweight standalone C++ implementation of a
mechanical model to simulate the dynamics of soft particles and cellular
tissues in two dimensions. With only few geometrical and physical parameters,
PolyHoop is capable of simulating a wide range of particulate soft matter
systems: from biological cells and tissues to vesicles, bubbles, foams,
emulsions, and other amorphous materials. The soft particles or cells are
represented by continuously remodeling, non-convex, high-resolution polygons
that can undergo growth, division, fusion, aggregation, and separation. With
PolyHoop, a tissue or foam consisting of a million cells with high spatial
resolution can be simulated on conventional laptop computers.
Monitored quantum dynamics -- unitary evolution interspersed with
measurements -- has recently emerged as a rich domain for phase structure in
quantum many-body systems away from equilibrium. Here we study monitored
dynamics from the point of view of an eavesdropper who has access to the
classical measurement outcomes, but not to the quantum many-body system. We
show that a measure of information flow from the quantum system to the
classical measurement record -- the informational power -- undergoes a phase
transition in correspondence with the measurement-induced phase transition
(MIPT). This transition determines the eavesdropper's (in)ability to learn
properties of an unknown initial quantum state of the system, given a complete
classical description of the monitored dynamics and arbitrary classical
computational resources. We make this learnability transition concrete by
defining classical shadows protocols that the eavesdropper may apply to this
problem, and show that the MIPT manifests as a transition in the sample
complexity of various shadow estimation tasks, which become harder in the
low-measurement phase. We focus on three applications of interest: Pauli
expectation values (where we find the MIPT appears as a point of optimal
learnability for typical Pauli operators), many-body fidelity, and global
charge in $U(1)$-symmetric dynamics. Our work unifies different manifestations
of the MIPT under the umbrella of learnability and gives this notion a general
operational meaning via classical shadows.
Three-dimensional (3d) gapped topological phases with fractional excitations
are divided into two subclasses: one has topological order with point-like and
loop-like excitations fully mobile in the 3d space, and the other has fracton
order with point-like excitations constrained in lower-dimensional subspaces.
These exotic phases are often studied by exactly solvable Hamiltonians made of
commuting projectors, which, however, are not capable of describing those with
chiral gapless surface states. Here we introduce a systematic way, based on
cellular construction recently proposed for 3d topological phases, to construct
another type of exactly solvable models in terms of coupled quantum wires with
given inputs of cellular structure, two-dimensional Abelian topological order,
and their gapped interfaces. We show that our models can describe both 3d
topological and fracton orders (and even their hybrid) and study their
universal properties such as quasiparticle statistics and topological
ground-state degeneracy. We also apply this construction to two-dimensional
coupled-wire models with ordinary topological orders and
translation-symmetry-enriched topological orders. Our results pave the way for
effective quantum field theory descriptions or microscopic model realizations
of fracton orders with chiral gapless surface states.
Ultrafast-optical-pump -- structural-probe measurements, including ultrafast
electron and x-ray scattering, provide direct experimental access to the
fundamental timescales of atomic motion, and are thus foundational techniques
for studying matter out of equilibrium. High-performance detectors are needed
in scattering experiments to obtain maximum scientific value from every probe
particle. We deploy a hybrid pixel array direct electron detector to perform
ultrafast electron diffraction experiments on a WSe$_2$/MoSe$_2$ 2D
heterobilayer, resolving the weak features of diffuse scattering and moir\'e
superlattice structure without saturating the zero order peak. Enabled by the
detector's high frame rate, we show that a chopping technique provides
diffraction difference images with signal-to-noise at the shot noise limit.
Finally, we demonstrate that a fast detector frame rate coupled with a high
repetition rate probe can provide continuous time resolution from femtoseconds
to seconds, enabling us to perform a scanning ultrafast electron diffraction
experiment that maps thermal transport in WSe$_2$/MoSe$_2$ and resolves
distinct diffusion mechanisms in space and time.
We report the temperature evolution of the Dirac band in semiconducting
zirconium pentatelluride (ZrTe$_5$) using magneto-infrared spectroscopy. We
find that the band gap is temperature independent at low temperatures and
increases with temperature at elevated temperatures. Although such an
observation seems to support a weak topological insulator phase at all
temperatures and defy the previously reported topological phase transition
(TPT) at an intermediate temperature in ZrTe$_5$, we show that it is also
possible to explain the observation by considering the effect of
conduction-valence band mixing and band inversion with a strong topological
insulator phase at low temperatures. Our work provides an alternative picture
of the band gap evolution across TPT.
A large class of type-I fracton models, including the X-cube model, have been
found to be fixed points of the foliated renormalization group (RG). The system
size of such foliated models can be changed by adding or removing decoupled
layers of $2$D topological states and continuous deformation of the
Hamiltonian. In this paper, we study a closely related model -- the Ising
cage-net model -- and find that this model is not foliated in the same sense.
In fact, we point out certain unnatural restrictions in the foliated RG, and
find that removing these restrictions leads to a generalized foliated RG under
which the Ising cage-net model is a fixed point, and which includes the
original foliated RG as a special case. The Ising cage-net model thus gives a
prototypical example of the generalized foliated RG, and its system size can be
changed either by condensing / uncondensing bosonic planon excitations near a
2D plane or through a linear depth quantum circuit in the same plane. We show
that these two apparently different RG procedures are closely related, as they
lead to the same gapped boundary when implemented in part of a plane. Finally,
we briefly discuss the implications for foliated fracton phases, whose
universal properties will need to be reexamined in light of the generalized
foliated RG.
In the de Broglie-Bohm quantum theory, particles describe trajectories
determined by the flux associated with their wave function. These trajectories
are studied here for relativistic spin-one-half particles.Based in explicit
numerical calculations for the case of a massless particle in dimension three
space-time, it is shown that if the wave function is an eigenfunction of the
total angular momentum, the trajectories begin as circles of slowly increasing
radius until a transition time at which they tend to follow straight lines.
Arrival times at some detector, as well as their probability distribution are
calculated, too. The chosen energy and momentum parameters are of the orders of
magnitude met in graphene's physics.
We provide a simple algorithm for constructing Hamiltonian graph cycles
(visiting every vertex exactly once) on the set of aperiodic two-dimensional
Ammann-Beenker (AB) tilings. Using this result, and the discrete scale symmetry
of AB tilings, we find exact solutions to a range of other problems which lie
in the complexity class NP-Complete for general graphs. These include the
equal-weight travelling salesperson problem, providing for example the most
efficient route a scanning tunneling microscope tip could take to image the
atoms of physical quasicrystals with AB symmetries; the longest path problem,
whose solution demonstrates that collections of flexible molecules of any
length can adsorb onto AB quasicrystal surfaces at density one, with possible
applications to catalysis; and the 3-colouring problem, giving ground states
for the $q$-state Potts model ($q\ge 3$) of magnetic interactions defined on
the planar dual to AB, which may provide useful models for protein folding.
Optical driving of materials has emerged as a versatile tool to control their
properties, with photo-induced superconductivity being among the most
fascinating examples. In this work, we show that light or lattice vibrations
coupled to an electronic interband transition naturally give rise to
electron-electron attraction that may be enhanced when the underlying boson is
driven into a non-thermal state. We find this phenomenon to be resonantly
amplified when tuning the boson's frequency close to the energy difference
between the two electronic bands. This result offers a simple microscopic
mechanism for photo-induced superconductivity and provides a recipe for
designing new platforms in which light-induced superconductivity can be
realized. We propose a concrete setup consisting of a graphene-hBN-SrTiO$_3$
heterostructure, for which we estimate a superconducting $T_{\rm c}$ that may
be achieved upon driving the system.
We investigate the dispersive paramagnetic excitons on the honeycomb lattice
that originate from the crystalline-electric field (CEF) split localized
f-electron states in the paramagnetic state due to intersite exchange. We start
with a symmetry analysis of possible Ising-type singlet-singlet and xy-type
singlet-doublet models. The former supports only symmetric intersite-exchange
while the latter additionally allows for antisymmetric Dzyaloshinski-Moriya
(DM) exchange interactions. We calculate the closed expressions for magnetic
exciton dispersion using both response function formalism and the bosonic
Bogoliubov approach. We do this for the most general model that shows inversion
symmetry breaking on the honeycomb lattice but also discuss interesting special
cases. By calculating Berry curvatures and Chern numbers of paramagnetic
excitons we show that the xy model supports nontrivial topological states in a
wide range of parameters. This leads to the existence of excitonic topological
edge states with Dirac dispersion lying in the zone boundary gap without the
presence of magnetic order.
Parity-time (PT)-symmetry in the classical regime has been realized in optics
by introducing loss and gain in electromagnetic wave propagation which has
yielded numerous applications like nonreciprocal propagation and finite
threshold single-mode lasers. However, PT-symmetry in the quantum regime so far
remains elusive. Here, we demonstrate a PT-symmetric zero-threshold
polariton-Raman laser by utilizing stimulated resonant Raman scattering of
polarized exciton-polaritons. By pumping resonantly at the exceptional point of
polariton bands with non-Hermitian topology, a quantum PT-symmetric phase is
realized when the Raman-active phonon mode frequencies match with the polariton
mode frequency difference. The PT-symmetric phase corresponding to
zero-threshold lasing can be switched to PT broken phase showing a finite
threshold via cavity detuning by the variation of bath temperature or pump
polarization. Our realization of PT-symmetry in the quantum regime and
consequently the zero-threshold laser can open up applications in quantum
information and stimulate new research activities in cavity quantum
electrodynamics.

Date of feed: Fri, 28 Jul 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]+) **Views on gravity from condensed matter physics. (arXiv:2307.14370v1 [cond-mat.other])**

G.E. Volovik

**Competition between fractional quantum Hall liquid and electron solid phases in the Landau levels of multilayer graphene. (arXiv:2307.14519v1 [cond-mat.mes-hall])**

Rakesh K. Dora, Ajit C. Balram

**Twist-angle and thickness-ratio tuning of plasmon polaritons in twisted bilayer van der Waals films. (arXiv:2307.14586v1 [physics.optics])**

Chong Wang, Yuangang Xie, Junwei Ma, Guangwei Hu, Qiaoxia Xing, Shenyang Huang, Chaoyu Song, Fanjie Wang, Yuchen Lei, Jiasheng Zhang, Lei Mu, Tan Zhang, Yuan Huang, Cheng-Wei Qiu, Yugui Yao, Hugen Yan

**Spin-orbit torque emerging from orbital textures in centrosymmetric materials. (arXiv:2307.14673v1 [cond-mat.mes-hall])**

Luis M. Canonico, Jose H. García, Stephan Roche

**Broadband parametric amplification for multiplexed SiMOS quantum dot signals. (arXiv:2307.14717v1 [cond-mat.mes-hall])**

Victor Elhomsy, Luca Planat, David J. Niegemann, Bruna Cardoso-Paz, Ali Badreldin, Bernhard Klemt, Vivien Thiney, Renan Lethiecq, Eric Eyraud, Matthieu C. Dartiailh, Benoit Bertrand, Heimanu Niebojewski, Christopher Bäuerle, Maud Vinet, Tristan Meunier, Nicolas Roch, Matias Urdampilleta

**Real-space topological localizer index to fully characterize the dislocation skin effect. (arXiv:2307.14753v1 [cond-mat.mes-hall])**

Nisarg Chadha, Ali G. Moghaddam, Jeroen van den Brink, Cosma Fulga

**Emerging topological bound states in Haldane model zigzag nanoribbons. (arXiv:2307.14771v1 [cond-mat.mes-hall])**

Simone Traverso, Maura Sassetti, Niccolò Traverso Ziani

**Understanding magnetoelectric switching in BiFeO$_3$ thin films. (arXiv:2307.14789v1 [cond-mat.mtrl-sci])**

Natalya S. Fedorova, Dmitri E. Nikonov, John M. Mangeri, Hai Li, Ian A. Young, Jorge Íñiguez

**Solid lubrication by wet-transferred solution-processed graphene flakes: dissipation mechanisms and superlubricity in mesoscale contacts. (arXiv:2307.14813v1 [cond-mat.mes-hall])**

Renato Buzio, Andrea Gerbi, Cristina Bernini, Luca Repetto, Andrea Silva, Andrea Vanossi

**Topological superconductivity with large Chern numbers in a ferromagnetic metal-superconductor heterostructure. (arXiv:2307.14838v1 [cond-mat.supr-con])**

Yingwen Zhang, Dao-Xin Yao, Zhi Wang

**Eigenenergy braids in 2D photonic crystals. (arXiv:2307.14845v1 [physics.optics])**

Janet Zhong, Charles C. Wojcik, Dali Cheng, Shanhui Fan

**Anisotropic multiband superconductivity in 2M-WS$_{2}$ probed by controlled disorder. (arXiv:2307.14891v1 [cond-mat.supr-con])**

Sunil Ghimire, Kamal R. Joshi, Marcin Konczykowski, Romain Grasset, Amlan Datta, Makariy A. Tanatar, Damien Berube, Su-Yang Xu, Yuqiang Fang, Fuqiang Huang, Peter P. Orth, Mathias S. Scheurer, Ruslan Prozorov

**The structure of disintegrating defect clusters in smectic C freely suspended films. (arXiv:2307.14937v1 [cond-mat.soft])**

Ralf Stannarius, Kirsten Harth

**Spectroscopy and topological properties of a Haldane light system. (arXiv:2307.14960v1 [cond-mat.mes-hall])**

Julian Legendre, Karyn Le Hur

**Higher-order Topological Insulators and Semimetals in Three Dimensions without Crystalline Counterparts. (arXiv:2307.14974v1 [cond-mat.mes-hall])**

Yu-Feng Mao, Yu-Liang Tao, Jiong-Hao Wang, Qi-Bo Zeng, Yong Xu

**Helical Separation Effect and helical heat transport for Dirac fermions. (arXiv:2307.14987v1 [hep-th])**

Victor E. Ambruş, Maxim N. Chernodub

**Unpinned Dirac-Fermions in Carbon-Phosphorous-Arsenic Based Ternary Monolayer. (arXiv:2307.15001v1 [cond-mat.mtrl-sci])**

Amrendra Kumar, C. Kamal

**PolyHoop: Soft particle and tissue dynamics with topological transitions. (arXiv:2307.15006v1 [cond-mat.soft])**

Roman Vetter, Steve V. M. Runser, Dagmar Iber

**Learnability transitions in monitored quantum dynamics via eavesdropper's classical shadows. (arXiv:2307.15011v1 [quant-ph])**

Matteo Ippoliti, Vedika Khemani

**Bridging three-dimensional coupled-wire models and cellular topological states: Solvable models for topological and fracton orders. (arXiv:2112.07926v2 [cond-mat.str-el] UPDATED)**

Yohei Fuji, Akira Furusaki

**Multi-scale time-resolved electron diffraction: A case study in moir\'e materials. (arXiv:2206.08404v2 [physics.ins-det] UPDATED)**

C. J. R. Duncan, M. Kaemingk, W. H. Li, M. B. Andorf, A. C. Bartnik, A. Galdi, M. Gordon, C. A. Pennington, I. V. Bazarov, H. J. Zeng, F. Liu, D. Luo, A. Sood, A. M. Lindenberg, M. W. Tate, D. A. Muller, J. Thom-Levy, S. M. Gruner, J. M. Maxson

**Revealing temperature evolution of the Dirac band in ZrTe$_5$ via magneto-infrared spectroscopy. (arXiv:2211.16711v2 [cond-mat.mtrl-sci] UPDATED)**

Yuxuan Jiang, Tianhao Zhao, Luojia Zhang, Qiang Chen, Haidong Zhou, Mykhaylo Ozerov, Dmitry Smirnov, Zhigang Jiang

**Renormalization of Ising cage-net model and generalized foliation. (arXiv:2301.00103v2 [cond-mat.str-el] UPDATED)**

Zongyuan Wang, Xiuqi Ma, David T. Stephen, Michael Hermele, Xie Chen

**Bohm - de Broglie Cycles. (arXiv:2301.13251v2 [quant-ph] UPDATED)**

Olivier Piguet

**Hamiltonian cycles on Ammann-Beenker Tilings. (arXiv:2302.01940v3 [cond-mat.stat-mech] UPDATED)**

Shobhna Singh, Jerome Lloyd, Felix Flicker

**Theory of resonantly enhanced photo-induced superconductivity. (arXiv:2303.02176v2 [cond-mat.supr-con] UPDATED)**

Christian J. Eckhardt, Sambuddha Chattopadhyay, Dante M. Kennes, Eugene A. Demler, Michael A. Sentef, Marios H. Michael

**Topological paramagnetic excitons of localized f electrons on the honeycomb lattice. (arXiv:2303.17975v2 [cond-mat.str-el] UPDATED)**

Alireza Akbari, Burkhard Schmidt, Peter Thalmeier

**A Zero-Threshold PT-Symmetric Polariton-Raman Laser. (arXiv:2305.17475v3 [cond-mat.mes-hall] UPDATED)**

Avijit Dhara, Devarshi Chakrabarty, Pritam Das, Kritika Ghosh, Ayan Roy Chaudhuri, Sajal Dhara

Found 5 papers in prb In this paper, we provide theoretical approaches to identify the influence of the quasidisorder on a two-dimensional system. We discover that in the system there is a topological phase transition accompanied by a transverse Anderson localization. The topological features are characterized by the ban… We studied the exciton properties in double layers of transition metal dichalcogenides (TMDs) with a dielectric spacer between the layers. We developed a method based on an expansion of Chebyshev polynomials to solve the Wannier equation for the exciton. Corrections to the quasiparticle bandgap due … Triple-fold band degeneracy (TBD) is an intriguing phase of topological semimetals which appears as the intermediate state between the four-folded degenerated Dirac points and the two-folded Weyl points. The resemblance of TBD in the photonics is interesting, because it indicates nonzero Berry curva… The anomalous Hall effect has considerable impact on the progress of condensed matter physics and occurs in systems with time-reversal symmetry breaking. Here we theoretically investigate the anomalous Hall effect in the nonmagnetic transition metal pentatellurides ${\mathrm{ZrTe}}_{5}$ and ${\mathr… We investigate the dispersive paramagnetic excitons on the honeycomb lattice that originate from the crystalline electric field split localized $f$-electron states in the

Date of feed: Fri, 28 Jul 2023 03:17:06 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **From topological phase to transverse Anderson localization in a two-dimensional quasiperiodic system**

Shujie Cheng, Reza Asgari, and Gao Xianlong

Author(s): Shujie Cheng, Reza Asgari, and Gao Xianlong

[Phys. Rev. B 108, 024204] Published Thu Jul 27, 2023

**Tunable properties of excitons in double monolayer semiconductor heterostructures**

Luiz G. M. Tenório, Teldo A. S. Pereira, K. Mohseni, T. Frederico, M. R. Hadizadeh, Diego R. da Costa, and André J. Chaves

Author(s): Luiz G. M. Tenório, Teldo A. S. Pereira, K. Mohseni, T. Frederico, M. R. Hadizadeh, Diego R. da Costa, and André J. Chaves

[Phys. Rev. B 108, 035421] Published Thu Jul 27, 2023

**Triply degenerate topological phase and stretchable Fermi arc surface states in gyromagnetic metamaterials**

Mingzhu Li, Ning Han, Lu Qi, and Liang Peng

Author(s): Mingzhu Li, Ning Han, Lu Qi, and Liang Peng

[Phys. Rev. B 108, 035422] Published Thu Jul 27, 2023

**Theory of the anomalous Hall effect in the transition metal pentatellurides ${\mathrm{ZrTe}}_{5}$ and ${\mathrm{HfTe}}_{5}$**

Huan-Wen Wang, Bo Fu, and Shun-Qing Shen

Author(s): Huan-Wen Wang, Bo Fu, and Shun-Qing Shen

[Phys. Rev. B 108, 045141] Published Thu Jul 27, 2023

**Topological paramagnetic excitons of localized $f$ electrons on the honeycomb lattice**

Alireza Akbari, Burkhard Schmidt, and Peter Thalmeier

Author(s): Alireza Akbari, Burkhard Schmidt, and Peter Thalmeier*paramagnetic* state due to intersite exchange. We start with a symmetry analysis of possible Ising-type singlet-singlet and $xy$-t…

[Phys. Rev. B 108, 045143] Published Thu Jul 27, 2023

Found 2 papers in prl We report a topological phase transition in quantum-confined cadmium arsenide (${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$) thin films under an in-plane Zeeman field when the Fermi level is tuned into the topological gap via an electric field. Symmetry considerations in this case predict the appearance of … The translocation time of linear polymers across a varying-section channel shows a nonmonotonous dependence on the polymer size, that may be a useful tool to design channels for polymer sorting.

Date of feed: Fri, 28 Jul 2023 03:17:05 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **Zeeman Field-Induced Two-Dimensional Weyl Semimetal Phase in Cadmium Arsenide**

Binghao Guo, Wangqian Miao, Victor Huang, Alexander C. Lygo, Xi Dai, and Susanne Stemmer

Author(s): Binghao Guo, Wangqian Miao, Victor Huang, Alexander C. Lygo, Xi Dai, and Susanne Stemmer

[Phys. Rev. Lett. 131, 046601] Published Thu Jul 27, 2023

**Nonmonotonous Translocation Time of Polymers across Pores**

Emanuele Locatelli, Valentino Bianco, Chantal Valeriani, and Paolo Malgaretti

Author(s): Emanuele Locatelli, Valentino Bianco, Chantal Valeriani, and Paolo Malgaretti

[Phys. Rev. Lett. 131, 048101] Published Thu Jul 27, 2023

Found 1 papers in nano-lett

Date of feed: Thu, 27 Jul 2023 13:10:47 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]+) **[ASAP] Fluctuations in Planar Magnetotransport Due to Tilted Dirac Cones in Topological Materials**

Arya Thenapparambil, Graciely Elias dos Santos, Chang-An Li, Mohamed Abdelghany, Wouter Beugeling, Hartmut Buhmann, Charles Gould, Song-Bo Zhang, Björn Trauzettel, and Laurens W. MolenkampNano LettersDOI: 10.1021/acs.nanolett.3c01508

Found 2 papers in acs-nano

Date of feed: Thu, 27 Jul 2023 13:07:47 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]+) **[ASAP] A Surfactant-Free and General Strategy for the Synthesis of Bimetallic Core–Shell Nanocrystals on Reduced Graphene Oxide through Targeted Photodeposition**

Yidan Liu, Yali Ji, Qian Li, Yi Zhu, Jianchao Peng, Rongrong Jia, Zhuangchai Lai, Liyi Shi, Fengtao Fan, Gengfeng Zheng, Lei Huang, and Can LiACS NanoDOI: 10.1021/acsnano.3c04281

**[ASAP] Effects of Floquet Engineering on the Coherent Exciton Dynamics in Monolayer WS2**

Mitchell A. Conway, Stuart K. Earl, Jack B. Muir, Thi-Hai-Yen Vu, Jonathan O. Tollerud, Kenji Watanabe, Takashi Taniguchi, Michael S. Fuhrer, Mark T. Edmonds, and Jeffrey A. DavisACS NanoDOI: 10.1021/acsnano.3c01318