Found 21 papers in cond-mat We show that even in the limit of large cyclotron gap, Landau level (LL)
mixing can be dominant with scale-free interaction between charged ``elementary
particles" in a fractional quantum Hall system, as long as the filling factor
exceeds certain critical values. The corresponding Hamiltonians with scale-free
interaction can serve as exact model Hamiltonians for certain composite Fermion
or parton states (unlike the well-known TK Hamiltonians where the number of LLs
needs to be fixed by hand), and they are natural physical Hamiltonians for 2D
systems embedded in higher-dimensional space-time. Even with LL mixing the null
spaces of such Hamiltonians (spanned by the ground state and the quasiholes)
can be analytically obtained, and we show these are the generalisation of the
conformal Hilbert spaces (CHS) to more than one LLs. The effective interaction
between the anyons for these topological phases emerges from the kinetic energy
of the ``elementary particles", leading to an interesting duality between
strongly and weakly interacting systems that can be easily understood via the
tuning of parameters in the scale-free interaction. We also propose a novel
experimental platform for approximately realising such model Hamiltonians with
trion like particles, that can potentially lead to very robust (non-Abelian)
FQH phases from two-body Coulomb-based interaction.
Localized or propagating Majorana boundary modes are the key feature of
topological superconductors. While being a rarity in natural compounds, the
tailored manipulation of quantum matter offers novel opportunities for their
realization. Specifically, lattices of Shiba bound states that arise when
magnetic adatoms are placed on the surface of a conventional superconductor can
be used to create topological minibands within the superconducting gap of the
substrate. Here, we exploit the possibilities of scanning tunneling microscopy
to create and probe adatom lattices with single atom precision to create
topological crystalline superconductors. Their topological character and
boundary modes are protected by the spatial symmetries of the adatom lattice.
We combine scanning probe spectroscopy, spin-sensitive measurements, first
principle calculations, and theoretical modeling to to reveal signatures
consistent with the realization of two types of mirror-symmetry protected
topological superconductors: (i) with full bulk gap and topological edge as
well as higher-order corner states and (ii) with symmetry-protected bulk nodal
points. Our results show the immense versatility of Shiba lattices to design
the topology and sample geometry of 2D superconductors.
Two-dimensional (2D) semiconductors are promising candidates for
optoelectronic application and quantum information processes due to their
inherent out-of-plane 2D confinement. In addition, they offer the possibility
of achieving low-dimensional in-plane exciton confinement, similar to
zero-dimensional quantum dots, with intriguing optical and electronic
properties via strain or composition engineering. However, realizing such
laterally confined 2D monolayers and systematically controlling size-dependent
optical properties remain significant challenges. Here, we report the
observation of lateral confinement of excitons in epitaxially grown in-plane
MoSe2 quantum dots (~15-60 nm wide) inside a continuous matrix of WSe2
monolayer film via a sequential epitaxial growth process. Various optical
spectroscopy techniques reveal the size-dependent exciton confinement in the
MoSe2 monolayer quantum dots with exciton blue shift (12-40 meV) at a low
temperature as compared to continuous monolayer MoSe2. Finally, single-photon
emission was also observed from the smallest dots at 1.6 K. Our study opens the
door to compositionally engineered, tunable, in-plane quantum light sources in
2D semiconductors.
Nanostructured electronic devices, such as those based on graphene, are
typically grown on top of the insulator SiO2. Their exposure to a flux of small
size-selected silver nanoparticles has revealed remarkably selective adhesion:
the graphene channel can be made fully metallized while the insulating
substrate remains coverage-free. This conspicuous contrast derives from the low
binding energy between the metal nanoparticles and a contaminant-free
passivated silica surface. In addition to providing physical insight into
nanoparticle adhesion, this effect may be of value in applications involving
deposition of metallic layers on device working surfaces: it eliminates the
need for masking the insulating region and the associated extensive and
potentially deleterious pre- and postprocessing.
This article reports a comparative study of bulk and surface properties in
the transition metal dichalcogenide 1T-TaS$_2$. When heating the sample, the
surface displays an intermediate insulating phase that persists for $\sim 10$ K
on top of a metallic bulk. The weaker screening of Coulomb repulsion and
stiffer Charge Density Wave (CDW) explain such resilience of a correlated
insulator in the topmost layers. Both time resolved ARPES and transient
reflectivity are employed to investigate the dynamics of electrons and CDW
collective motion. It follows that the amplitude mode is always stiffer at the
surface and displays variable coupling to the Mott-Peierls band, stronger in
the low temperature phase and weaker in the intermediate one.
While topology is a property of a quantum state itself, most existing methods
for characterizing the topology of interacting phases of matter require direct
knowledge of the underlying Hamiltonian. We offer an alternative by utilizing
the one-particle density matrix formalism to extend the concept of the Chern,
chiral, and Chern-Simons markers to include interactions. The one-particle
density matrix of a free-fermion state is a projector onto the occupied bands,
defining a Brillouin zone bundle of the given topological class. This is no
longer the case in the interacting limit, but as long as the one-particle
density matrix is gapped, its spectrum can be adiabatically flattened,
connecting it to a topologically equivalent projector. The corresponding
topological markers thus characterize the topology of the interacting phase.
Importantly, the one-particle density matrix is defined in terms of a given
state alone, making the local markers numerically favorable, and providing an
invaluable tool for characterizing topology of interacting systems when only
the state itself is available. To demonstrate the practical use of the markers
we use the chiral marker to identify the topology of the ground state of the
Majorana-XYZ model as well as the midspectrum eigenstates of the Ising-Majorana
chain across the transition between the ergodic and many-body localized phases.
Conventional vapor deposition or epitaxial growth of two-dimensional (2D)
materials and heterostructures is conducted in a large chamber in which masses
transport from the source to the substrate. Here we report a chamber-free,
on-chip approach for growing a 2D crystalline structures directly in a
nanoscale surface-confined 2D space. The method is based on a surprising
discovery of a rapid, long-distance, non-Fickian transport of a uniform layer
of atomically thin palladium (Pd) on a monolayer crystal of tungsten
ditelluride (WTe2), at temperatures well below the known melting points of all
materials involved. The resulting nanoconfined growth realizes a controlled
formation of a stable new 2D crystalline material, Pd7WTe2 , when the monolayer
seed is either free-standing or fully encapsulated in a van der Waals stack.
The approach is generalizable and highly compatible with nanodevice
fabrication, promising to expand the library of 2D materials and their
functionalities.
A hallmark of many unconventional superconductors is the presence of
many-body interactions which give rise to broken symmetry states intertwined
with superconductivity. Recent resonant soft x-ray scattering experiments
report commensurate $3a_0$ charge density wave order in the infinite layer
nickelates, which has important implications regarding the universal interplay
between charge order and superconductivity in both the cuprates and nickelates.
Here, we present x-ray scattering and spectroscopy measurements on a series of
NdNiO$_{2+x}$ samples which reveal that the signatures of charge density wave
order are absent in fully reduced, single-phase NdNiO$_2$. The $3a_0$
superlattice peak instead originates from a partially reduced impurity phase
where excess apical oxygens form ordered rows with 3 unit cell periodicity. The
absence of any observable charge density wave order in NdNiO$_2$ highlights a
crucial difference between the phase diagrams of the cuprate and nickelate
superconductors.
The phase distribution in a Bose-Einstein condensate can realize various
topological states which can be classified according to distinct winding
numbers. While states with different winding numbers are topologically
protected in the linear Schr\"odinger equation, when nonlinearities are
introduced, violations of the topological protection can occur, leading to
unwinding. Exciton-polariton condensates constitute a weakly nonlinear open
dissipative system that is well suited to studying such physics. Here we show
that exciton-polariton condensates display a spontaneous phase unwinding from a
$\pi$- to zero-state. While such an effect was previously observed in a
one-dimensional polariton-condensate array and explained as occurring due to
single-particle mode competition, we offer a new explanation in terms of
collective phase unwinding of metastable states. We clarify that the collective
transition is caused by the combined effect of nonlinearity and topological
defects in the condensates. Reanalyzing the experimental data, we find an
evidence of the collective phase unwinding.
A class of integrable models, such as the one-dimensional transverse-field
Ising model, respond nonmonotonically to a periodic drive with respect to the
driving parameters and freezes almost absolutely for certain combinations of
the latter. In this paper, we go beyond the two-band structure of the
Ising-like models studied previously and ask whether such unusual nonmonotonic
response and near-absolute freezing occur in integrable systems with a higher
number of bands. To this end, we consider a tight-binding model for bilayer
graphene subjected to an interlayer potential difference. We find that when the
potential is driven periodically, the system responds nonmonotonically to
variations in the driving amplitude $V_0$ and frequency $\omega$ and shows near
absolute freezing for certain values of $V_0/\omega$. However, the freezing
occurs only in the presence of a constant bias in the driving, i.e., when $V=
V'+V_0 \cos{\omega t}$. When $V'=0$, the freezing is switched off for all
values of $V_0/\omega$. We support our numerical results with analytical
calculations based on a rotating wave approximation. We also give a proposal to
realize the driven bilayer system via ultracold atoms in an optical lattice,
where the driving can be implemented by shaking the lattice.
The solid diffusive phase transformation involving the nucleation and growth
of one nucleus is universal and frequently employed but has not yet been fully
understood at the atomic level. Here, our first-principles calculations reveal
a structural formation pathway of a series of topologically close-packed (TCP)
phases within the hexagonally close-packed (hcp) matrix. The results show that
the nucleation follows a nonclassical nucleation process, and the whole
structural transformation is completely accomplished by the shuffle-based
displacements, with a specific 3-layer hcp-ordering as the basic structural
transformation unit. The thickening of plate-like TCP phases relies on forming
these hcp-orderings at their coherent TCP/matrix interface to nucleate ledge,
but the ledge lacks the dislocation characteristics considered in the
conventional view. Furthermore, the atomic structure of the critical nucleus
for the Mg2Ca and MgZn2 Laves phases was predicted in terms of Classical
Nucleation Theory (CNT), and the formation of polytypes and off-stoichiometry
in TCP precipitates is found to be related to the nonclassical nucleation
behavior. Based on the insights gained, we also employed high-throughput
screening to explore several common hcp-metallic (including hcp-Mg, Ti, Zr, and
Zn) systems that may undergo hcp-to-TCP phase transformations. These insights
can deepen our understanding of solid diffusive transformations at the atomic
level, and constitute a foundation for exploring other technologically
important solid diffusive transformations.
Materials that can host macroscopic persistent current are important because
they are useful for energy storage. However, there are very few examples of
such materials in nature. Superconductors are known as an example in which flow
of supercurrent can persist up to 100,000 years. The chiral magnetic current is
possibly the second example predicted by the chiral magnetic effect. It was
proposed to be realized in recently discovered Weyl semimetals. However, a
no-go theorem negates the chiral magnetic effect and shows that the chiral
magnetic current is generally absent in any equilibrium condensed-matter
system. Here we show how to break the no-go theorem by resorting to dynamical
transitions in time-frequency space. By driving an insulator using a
time-periodic potential and coupling it to a phonon heat bath that provides
suitable dissipation, we show that a Floquet-Weyl semi-metallic phase with
Fermi-Dirac-like distribution emerges. Furthermore, we show that even in the
presence of a static magnetic field, the resulting steady Floquet-Weyl
semimetal supports non-vanishing chiral magnetic current. Our dynamical model
provides a systematic way to fully realize the chiral magnetic effect in
condensed matter systems.
We report strongly correlated electronic band structure calculations of the
recently discovered double-layer high-temperature superconductor
La$_3$Ni$_2$O$_7$ under pressure. Our calculations reveal dual nature of Ni-$d$
electrons with almost localized $d_{z^2}$ orbitals due to onsite Coulomb
repulsion and very flat hybridization bands of Ni-$d_{x^2-y^2}$ and
Ni-$d_{z^2}$ quasiparticles near the Fermi energy. We find that the
quasiparticle effective mass are greatly enhanced by the Hund's rule coupling
and their lifetimes are inversely proportional to the temperature, which
explains the experimentally observed strange metal behavior in the normal
state. We also find strong antiferromagnetic spin correlations of Ni-$d$
electrons, which may provide the pairing force of quasiparticles for the
high-temperature superconductivity. These give a potential explanation of two
key observations in experiment and connect the superconducting
La$_3$Ni$_2$O$_7$ with cuprate high-temperature superconductors. The presence
of flat bands and the interplay of orbital-selective Mott, Hund, and Kondo
physics make La$_3$Ni$_2$O$_7$ a unique platform for exploring rich emergent
quantum many-body phenomena in the future.
We carry out an extensive numerical study of low-temperature electronic
transport in quantum point contacts based on twisted bilayer graphene. Assuming
ballistic electron dynamics, quantized plateaus in the conductance are observed
in defect-free samples when the twisting angle is large enough. However,
plateaus are smeared out and hardly noticeable on decreasing the angle. Close
to the magic angle, the conductance around the charge neutrality point drops
significantly and the quantization steps visible at higher angles are no longer
appreciable. Furthermore, we consider the effects of a random distribution of
vacancies on the quantum point contact. Whereas the electron-hole symmetry is
broken in pristine samples, we find that this symmetry is restored upon
increasing the concentration of vacancies. We explain this effect by a
reduction of the effective interlayer coupling due to the presence of the
vacancies.
Su-Schrieffer-Heeger (SSH) model is one of the simplest models to show
topological end/edge states and the existence of Majorana fermions. Here we
consider a SSH like model both in one and two dimensions where a nearest
neighbor hopping features spatially periodic modulations. In the 1D chain, we
witness appearance of new in-gap end states apart from a pair of Majorana zero
modes (MZM) when the hopping periodicity go beyond two lattice spacings. The
pair of MZMs, that appear in the topological regime, characterize the end modes
each existing in either end of the chain. These, however, crossover to both-end
end modes for small hopping detuning strength in a finite chain. Contrarily in
a 2D SSH model with symmetric hopping that we consider, both non-zero and zero
energy topological states appear in a finite square lattice even with a simple
staggered hopping, though the zero energy modes disappear in a ribbon
configuration. Apart from edge modes, the 2D system also features corner modes
as well as modes with satellite peaks distributed non-randomly within the
lattice. In both the dimensions, an increase in the periodicity of hopping
modulation causes the zero energy Majorana modes to become available for either
sign of the detuning. But interestingly with different periodicity for hopping
modulations in the two directions, the zero energy modes in a 2D model become
rarer and does not appear for all strength and sign of the detuning.
Magnetic multilayers with interlayer exchange coupling have been widely
studied for both static and dynamic regimes. Their dynamical responses depend
on the exchange coupling strength and magnetic properties of individual layers.
Magnetic resonance spectra in such systems are conveniently discussed in terms
of coupling of acoustic and optical modes. At a certain value of applied
magnetic field, the two modes come close to being degenerate and the spectral
gap indicates the strength of mode hybridisation. In this work, we
theoretically and experimentally study the mode hybridisation of
interlayer-exchange-coupled moments with dissimilar magnetisation and thickness
of two ferromagnetic layers. In agreement with symmetry analysis for
eigenmodes, our low-symmetry multilayers exhibit sizable spectral gaps for all
experimental conditions. The spectra agree well with the predictions from the
Landau-Lifshitz-Gilbert equation at the macrospin limit whose parameters are
independently fixed by static measurements.
The existence of fractionally quantized topological corner states serves as a
key indicator for two-dimensional second-order topological insulators (SOTIs),
yet has not been experimentally observed in realistic materials. Here, based on
first-principles calculations and symmetry arguments, we propose a strategy for
achieving SOTI phases with in-gap corner states in
(MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_{m}$ films with antiferromagnetic (AFM) order.
Starting from the prototypical AFM MnBi$_2$Te$_4$ bilayer, we show by an
effective lattice model that such SOTI phase originate from the interplay
between intrinsic spin-orbital coupling and interlayer AFM exchange
interactions. Furthermore, we demonstrate that the nontrivial corner states are
linked to rotation topological invariants under three-fold rotation symmetry
$C_3$, resulting in $C_3$-symmetric SOTIs with corner charges fractionally
quantized to $\frac{n}{3} \lvert e \rvert $ (mod $e$). Due to the great recent
achievements in (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_{m}$ systems, our results
providing reliable material candidates for experimentally accessible AFM
higher-order band topology would draw intense attentions.
To understand the essential properties of Dirac crystals, such as their
thermal conductivity, we require models that consider the interaction between
Dirac electrons and dispersive acoustic phonons. The exceptionally high thermal
conductivity in 2D Dirac crystals is attributed to near-ideal phonon quantum
gases, while undesired limitations arise from electron-phonon (e-ph)
interactions which have been shown to limit the thermal conductivity up to
several microns away. The e-ph thermal conductivity is directly linked to the
phonon scattering rate. Conventional calculations overlook phonons with
short-dispersive wavelengths, rendering them inadequate for analyzing 2D Dirac
crystals. The phonon scattering rate is typically calculated up to the
first-order magnitude, considering 3-particle interactions involving the decay
of an electron and phonon (EP-E*) to create a new electron. However, processes
involving the decay of an electron and the creation of a new electron and
phonon (E-E*P*) are neglected. In this study, we present an accurate expression
for the phonon scattering rate and e-ph thermal conductivity in 2D Dirac
crystals, accounting for short-dispersive wavelength phonons. We demonstrate
the significance of the E-E*P* process even at room temperature in calculating
the phonon scattering rate and e-ph thermal conductivity, particularly for
first-order e-ph interactions. Furthermore, we emphasize the importance of
incorporating second-order e-ph interactions, specifically the EP-E*P*
interaction involving the decay of an electron and phonon and the creation of a
new electron-phonon pair, to accurately determine the phonon scattering rate
and e-ph thermal conductivity at high temperatures and low Fermi energies. This
4-particle interaction process plays a crucial role in characterizing these
properties effectively.
We argue that the chiral $U(1)_A$ symmetry of a Weyl fermion cannot be
implemented by a shallow depth quantum circuit operation in a fermionic lattice
Hamiltonian model with finite dimensional onsite Hilbert spaces. We also extend
this result to discrete ${\mathbb{Z}}_{2N}$ subgroups of $U(1)_A$, in which
case we show that for $N_f$ Weyl fermions of the same helicity, this group
action cannot be implemented with shallow depth circuits when $N_f$ is not an
integer multiple of $2N$.
A non-vanishing entropy production rate is a hallmark of non-equilibrium
stationary states and is therefore at the heart of non-equilibrium
thermodynamics. It is a manifestation of a steady circulation $J_{\rm inv}$
along the level sets of the invariant density $\rho_{\rm inv}$, and is thus
generically used to quantify how far a steady system is driven out of
equilibrium. While it is well known that there exists a continuum of distinct
steady states with the same invariant measure, the question how the geometry
and topology of the invariant current a priori affect dissipation remained
elusive. For confined irreversible diffusions we identify two minimal
descriptors, the $\rho_{\rm inv}$-weighted vorticity and the variation of
$J_{\rm inv}$ along level sets of $\rho_{\rm inv}$, and prove that these
jointly bound from above the steady-state entropy production rate. In regions
where $\rho_{\rm inv}$ is close to Gaussian the bound is dominated solely by
the vorticity of the drift field and in the low-noise (Freidlin-Wentzel) limit
by any non-potential contribution to the drift, rendering $J_{\rm inv}$
virtually constant along the level sets of $\rho_{\rm inv}$.
Floquet engineering is an important tool for realizing topologically
nontrivial band structures for charge-neutral atoms in optical lattices.
However, the preparation of a topological-band-insulator-type state of
fermions, with one nontrivial quasi-energy band filled completely and the
others empty, is challenging as a result of both driving induced heating as
well as imperfect adiabatic state preparation (with the latter induced by the
unavoidable gap closing when passing the topological transition). An
alternative procedure that has been proposed is to prepare such states
dissipatively, i.e. as a steady state that emerges when coupling the system to
reservoirs. Here we discuss a concrete scheme that couples the system to a
weakly interacting Bose-condensate given by second atomic species acting as a
heat bath. Our strategy relies on the engineering of the potential for the bath
particles, so that they occupy weakly coupled tubes perpendicular to the
two-dimensional system. Using Floquet-Born-Markov theory, we show that the
resulting nonequilibrium steady state of the driven-dissipative system
approximates a topological insulator. We even find indications for the
approximate stabilization of an anomalous Floquet topological insulator, a
state that is impossible to realize in equilibrium.

Date of feed: Fri, 14 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]+) **Emergent dynamics of scale-free interactions in fractional quantum Hall fluids. (arXiv:2307.06361v1 [cond-mat.str-el])**

Bo Yang

**Building crystalline topological superconductors from Shiba lattices. (arXiv:2307.06365v1 [cond-mat.mes-hall])**

Martina O. Soldini, Felix Küster, Glenn Wagner, Souvik Das, Amal Aldarawsheh, Ronny Thomale, Samir Lounis, Stuart S. P. Parkin, Paolo Sessi, Titus Neupert

**Exciton Confinement in Two-Dimensional, In-Plane, Quantum Heterostructures. (arXiv:2307.06404v1 [cond-mat.mes-hall])**

Gwangwoo Kim, Benjamin Huet, Christopher E. Stevens, Kiyoung Jo, Jeng-Yuan Tsai, Saiphaneendra Bachu, Meghan Leger, Kyung Yeol Ma, Nicholas R. Glavin, Hyeon Suk Shin, Nasim Alem, Qimin Yan, Joshua R. Hedrickson, Joan M. Redwing, Deep Jariwala

**Substrate-Selective Adhesion of Metal Nanoparticles to Graphene Devices. (arXiv:2307.06407v1 [physics.atm-clus])**

Patrick J. Edwards, Sean Stuart, James T. Farmer, Ran Shi, Run Long, Oleg V. Prezhdo, Vitaly V. Kresin

**Dynamics of electronic states in the Intermediate phase of 1T-TaS$_2$. (arXiv:2307.06444v1 [cond-mat.str-el])**

Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, Luca Perfetti

**Interacting Local Topological Markers: A one-particle density matrix approach for characterizing the topology of interacting and disordered states. (arXiv:2307.06447v1 [cond-mat.mes-hall])**

Julia D. Hannukainen, Miguel F. Martínez, Jens H. Bardarson, Thomas Klein Kvorning

**Surface-Confined Two-Dimensional Crystal Growth on a Monolayer. (arXiv:2307.06477v1 [cond-mat.mes-hall])**

Yanyu Jia, Fang Yuan, Guangming Cheng, Yue Tang, Guo Yu, Tiancheng Song, Pengjie Wang, Ratnadwip Singha, Ayelet July Uzan, Michael Onyszczak, Kenji Watanabe, Takashi Taniguchi, Nan Yao, Leslie M Schoop, Sanfeng Wu

**Absence of $3a_0$ Charge Density Wave Order in the Infinite Layer Nickelates. (arXiv:2307.06486v1 [cond-mat.supr-con])**

C. T. Parzyck, N. K. Gupta, Y. Wu, V. Anil, L. Bhatt, M. Bouliane, R. Gong, B. Z. Gregory, A. Luo, R. Sutarto, F. He, Y.-D. Chuang, T. Zhou, G. Herranz, L. F. Kourkoutis, A. Singer, D. G. Schlom, D. G. Hawthorn, K. M. Shen

**Topological Unwinding in an Exciton-Polariton Condensate Array. (arXiv:2307.06550v1 [cond-mat.quant-gas])**

Guitao Lyu, Yuki Minami, Na Young Kim, Tim Byrnes, Gentaro Watanabe

**Dynamical freezing and switching in periodically driven bilayer graphene. (arXiv:2307.06589v1 [cond-mat.str-el])**

Soumya Sasidharan, Naveen Surendran

**Structural pathway for nucleation and growth of topologically close-packed phase from parent hexagonal crystal. (arXiv:2307.06676v1 [cond-mat.mtrl-sci])**

Junyuan Bai, Hongbo Xie, Xueyong Pang, Min Jiang, Gaowu Qin

**Manifestation of chiral magnetic current in Floquet-Weyl semimetals. (arXiv:2307.06735v1 [cond-mat.mtrl-sci])**

Tsung-Yu Chen, Po-Hao Chou, Chung-Yu Mou

**Flat bands promoted by Hund's rule coupling in the candidate double-layer high-temperature superconductor La$_3$Ni$_2$O$_7$. (arXiv:2307.06806v1 [cond-mat.supr-con])**

Yingying Cao, Yi-feng Yang

**Impact of vacancies on twisted bilayer graphene quantum point contacts. (arXiv:2307.06819v1 [cond-mat.mes-hall])**

Pablo Moles, Francisco Domínguez-Adame, Leonor Chico

**Edge state behavior in a Su-Schrieffer-Heeger like model with periodically modulated hopping. (arXiv:2307.06829v1 [cond-mat.mes-hall])**

Satyaki Kar

**Magnon-magnon coupling in synthetic ferrimagnets. (arXiv:2307.06888v1 [cond-mat.mtrl-sci])**

A. Sud, K. Yamamoto, K. Z. Suzuki, S. Mizukami, H. Kurebayashi

**Second-order Band Topology in Antiferromagnetic (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_{m}$ Films. (arXiv:2307.06903v1 [cond-mat.mtrl-sci])**

Fangyang Zhan, Zheng Qin, Dong-Hui Xu, Xiaoyuan Zhou, Da-Shuai Ma, Rui Wang

**Higher-order electron-phonon interactions and their effect on the thermal properties of 2D Dirac crystals. (arXiv:2305.18369v2 [cond-mat.mes-hall] UPDATED)**

Sina Kazemian, Giovanni Fanchini

**A no-go result for implementing chiral symmetries by locality-preserving unitaries in a 3 dimensional Hamiltonian lattice model of fermions. (arXiv:2306.10105v3 [cond-mat.str-el] UPDATED)**

Lukasz Fidkowski, Cenke Xu

**Vorticity and level-set variations of invariant current bound steady-state dissipation. (arXiv:2306.13647v2 [math-ph] UPDATED)**

Hao De, Aljaž Godec

**Dissipative preparation of a Floquet topological insulator in an optical lattice via bath engineering. (arXiv:2307.03739v2 [cond-mat.quant-gas] UPDATED)**

Alexander Schnell, Christof Weitenberg, André Eckardt

Found 9 papers in prb Non-Hermitian quasicrystal forms a unique class of matter with symmetry-breaking, localization and topological transitions induced by gain and loss or nonreciprocal effects. In this work, we introduce a non-Abelian generalization of non-Hermitian quasicrystal, in which the interplay between non-Herm… We study hard-core bosons on the honeycomb lattice subjected to anisotropic nearest-neighbor hopping along with anisotropic nearest-neighbor repulsion, using a quantum Monte Carlo technique. At half filling, we find a transition from strong topological interacting order to weak topological interacti… Recent experiments demonstrated that single-particle quantum walks can reveal the topological properties of single-particle states. Here, we generalize this picture to the many-body realm by focusing on multiparticle quantum walks of strongly interacting fermions. After injecting $N$ particles with … Doping asymmetry is a notable phenomenon with semiconductors and a particularly long-standing challenge limiting the applications of most wide band-gap semiconductors, which are inherent of spontaneous heavy $n$- or $p$-type doping because of their extreme band edges. This study theoretically shows … We report a unified theory based on linear response, for analyzing the longitudinal optical conductivity (LOC) of materials with tilted Dirac cones. Depending on the tilt parameter $t$, the Dirac electrons have four phases: untilted, type I, type II, and type III; the Dirac dispersion can be isotrop… The most relevant characteristic of a topological insulator material is the presence of edge/surface states that are protected by the bulk topology, and therefore, insensitive to nonmagnetic disorder. However, if such disorder is induced by magnetic atoms or the topological insulator is subjected to… We study the anomalous Hall effect in a disordered Weyl semimetal. While the intrinsic contribution is expressed solely in terms of Berry curvature, the extrinsic contribution is given by a combination of the skew-scattering and side-jump terms. For the model of small-size impurities, we are able to… The spin of an electron confined in semiconductor quantum dots is currently a promising candidate for quantum bit (qubit) implementations. Taking advantage of the existing CMOS integration technologies, such devices can offer a platform for large scale quantum computation. However, a quantum mechani… Topological classification of quantum solids often (if not always) groups all trivial atomic or normal insulators (NIs) into the same featureless family. As we argue here, this is not necessarily the case always. In particular, when the global phase diagram of electronic crystals harbors topological…

Date of feed: Fri, 14 Jul 2023 03:17:13 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]+) **Non-Abelian generalization of non-Hermitian quasicrystals: $\mathcal{PT}$-symmetry breaking, localization, entanglement, and topological transitions**

Longwen Zhou

Author(s): Longwen Zhou

[Phys. Rev. B 108, 014202] Published Thu Jul 13, 2023

**Strong to weak topological interacting phase transition of bosons on a lattice**

Amrita Ghosh and Eytan Grosfeld

Author(s): Amrita Ghosh and Eytan Grosfeld

[Phys. Rev. B 108, 035125] Published Thu Jul 13, 2023

**Multiparticle quantum walk: A dynamical probe of topological many-body excitations**

Bogdan Ostahie, Doru Sticlet, Cătălin Paşcu Moca, Balázs Dóra, Miklós Antal Werner, János K. Asbóth, and Gergely Zaránd

Author(s): Bogdan Ostahie, Doru Sticlet, Cătălin Paşcu Moca, Balázs Dóra, Miklós Antal Werner, János K. Asbóth, and Gergely Zaránd

[Phys. Rev. B 108, 035126] Published Thu Jul 13, 2023

**Reversing doping asymmetry in semiconductor thin films with external voltage**

Kai Liu, Zhibin Yi, and Guangfu Luo

Author(s): Kai Liu, Zhibin Yi, and Guangfu Luo

[Phys. Rev. B 108, 035204] Published Thu Jul 13, 2023

**Effects of spatial dimensionality and band tilting on the longitudinal optical conductivities in Dirac bands**

Jian-Tong Hou, Chang-Xu Yan, Chao-Yang Tan, Zhi-Qiang Li, Peng Wang, Hong Guo, and Hao-Ran Chang (张浩然)

Author(s): Jian-Tong Hou, Chang-Xu Yan, Chao-Yang Tan, Zhi-Qiang Li, Peng Wang, Hong Guo, and Hao-Ran Chang (张浩然)

[Phys. Rev. B 108, 035407] Published Thu Jul 13, 2023

**Local surface electronic response of ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$ topological insulator upon europium doping**

Gilberto Rodrigues-Junior, Thaís Chagas, Rafael Reis, Paulo Victor Sciammarella, Celso I. Fornari, Paulo H. O. Rappl, Eduardo Abramof, Rogério Magalhães-Paniago, and Ângelo Malachias

Author(s): Gilberto Rodrigues-Junior, Thaís Chagas, Rafael Reis, Paulo Victor Sciammarella, Celso I. Fornari, Paulo H. O. Rappl, Eduardo Abramof, Rogério Magalhães-Paniago, and Ângelo Malachias

[Phys. Rev. B 108, 035408] Published Thu Jul 13, 2023

**Anomalous Hall effect in disordered Weyl semimetals**

Yonatan Messica, Dmitri B. Gutman, and Pavel M. Ostrovsky

Author(s): Yonatan Messica, Dmitri B. Gutman, and Pavel M. Ostrovsky

[Phys. Rev. B 108, 045121] Published Thu Jul 13, 2023

**Modeling semiconductor spin qubits and their charge noise environment for quantum gate fidelity estimation**

M. Mohamed El Kordy Shehata, George Simion, Ruoyu Li, Fahd A. Mohiyaddin, Danny Wan, Massimo Mongillo, Bogdan Govoreanu, Iuliana Radu, Kristiaan De Greve, and Pol Van Dorpe

Author(s): M. Mohamed El Kordy Shehata, George Simion, Ruoyu Li, Fahd A. Mohiyaddin, Danny Wan, Massimo Mongillo, Bogdan Govoreanu, Iuliana Radu, Kristiaan De Greve, and Pol Van Dorpe

[Phys. Rev. B 108, 045305] Published Thu Jul 13, 2023

**Topologically distinct atomic insulators**

Sanjib Kumar Das, Sourav Manna, and Bitan Roy

Author(s): Sanjib Kumar Das, Sourav Manna, and Bitan Roy

[Phys. Rev. B 108, L041301] Published Thu Jul 13, 2023

Found 3 papers in prl We consider a mechanism that causes a decrease in the attenuation of high energy gamma-ray flux from gamma ray burst GRB 221009A. The mechanism is based on the existence of a heavy ${m}_{N}∼(0.1−1)\text{ }\text{ }\mathrm{MeV}$ mostly sterile neutrino $N$ which mixes with active neutrinos. $N$’s are … Floquet moiré materials possess optically-induced flat-electron bands with steady-states sensitive to drive parameters. Within this regime, we show that strong interaction screening and phonon bath coupling can overcome enhanced drive-induced heating. In twisted bilayer graphene (TBG) irradiated by … A superconducting strip allows more superconducting current to flow in one direction than in the other—achieving a stronger diode effect than previous devices.

Date of feed: Fri, 14 Jul 2023 03:17:12 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]+) **GRB 221009A Gamma Rays from the Radiative Decay of Heavy Neutrinos?**

Alexei Y. Smirnov and Andreas Trautner

Author(s): Alexei Y. Smirnov and Andreas Trautner

[Phys. Rev. Lett. 131, 021002] Published Thu Jul 13, 2023

**Optical Control of Slow Topological Electrons in Moiré Systems**

Christopher Yang, Iliya Esin, Cyprian Lewandowski, and Gil Refael

Author(s): Christopher Yang, Iliya Esin, Cyprian Lewandowski, and Gil Refael

[Phys. Rev. Lett. 131, 026901] Published Thu Jul 13, 2023

**Ubiquitous Superconducting Diode Effect in Superconductor Thin Films**

Yasen Hou, Fabrizio Nichele, Hang Chi, Alessandro Lodesani, Yingying Wu, Markus F. Ritter, Daniel Z. Haxell, Margarita Davydova, Stefan Ilić, Ourania Glezakou-Elbert, Amith Varambally, F. Sebastian Bergeret, Akashdeep Kamra, Liang Fu, Patrick A. Lee, and Jagadeesh S. Moodera

Author(s): Yasen Hou, Fabrizio Nichele, Hang Chi, Alessandro Lodesani, Yingying Wu, Markus F. Ritter, Daniel Z. Haxell, Margarita Davydova, Stefan Ilić, Ourania Glezakou-Elbert, Amith Varambally, F. Sebastian Bergeret, Akashdeep Kamra, Liang Fu, Patrick A. Lee, and Jagadeesh S. Moodera

[Phys. Rev. Lett. 131, 027001] Published Thu Jul 13, 2023

Found 1 papers in pr_res Helical edge states in topological insulators generate a counterpropagating spin current on the two parallel edges. We here propose antihelical edge states of magnons in patterned antiferromagnetic thin films, which host a copropagating spin current on the two parallel edges, where the two magnon mo…

Date of feed: Fri, 14 Jul 2023 03:17:13 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]+) **Antihelical edge magnons in patterned antiferromagnetic thin films**

Yun-Mei Li

Author(s): Yun-Mei Li

[Phys. Rev. Research 5, 033026] Published Thu Jul 13, 2023

Found 1 papers in nat-comm **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]+) **Scalable graphene sensor array for real-time toxins monitoring in flowing water**

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Found 2 papers in comm-phys Communications Physics, Published online: 13 July 2023; doi:10.1038/s42005-023-01286-x Communications Physics, Published online: 13 July 2023; doi:10.1038/s42005-023-01288-9**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]+) **Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe**

Naoki Fujiwara

**Interference, diffraction, and diode effects in superconducting array based on bismuth antimony telluride topological insulator**

Alexey Bezryadin