Found 38 papers in cond-mat In two-dimensional Fermi liquids, odd-parity Fermi surface deformations have
anomalously slow relaxation rates that are suppressed as $T^4$ with temperature
$T$, distinct from the standard Fermi-liquid $T^2$ scaling. We demonstrate here
that these long-lived modes, which are often hidden in linear response, have a
significant impact on nonlinear transport by establishing a direct
proportionality of nonlinear thermoelectric currents to the anomalously large
relaxation time. These currents exist in topological time-reversal invariant
Fermi liquids, and their magnitude is characterized by new topological heat
capacitance terms that we refer to as the {\em Berry curvature capacity} and
the {\em velocity-curvature capacity}. We quantify the effect in bismuth
telluride, which is an efficient thermoelectric and a topological insulator
with a hexagonal Fermi surface. Our findings demonstrate the potential to
explore topological and many-body effects in Fermi liquids through the
nonlinear thermoelectric response, urging further experimental studies.
Twisted homobilayer transition metal dichalcogenide (TMD) attracts an
expanding experimental interest recently for exhibiting a variety of
topological and magnetic states even at zero magnetic field. Most of the
studies right now focus on hole filling nu_h < 1, while a rich phase diagram at
higher hole filling calls for more investigation. We perform a thorough survey
of possible interaction-driven phases at higher integer hole fillings. We first
construct the continuum model from a first-principles calculation, and then
perform a self-consistent Hartree-Fock study of the interacting ground states.
We identify various valley polarized (VP) states at odd integer fillings and
intervalley coherent (IVC) states at even integer fillings and discuss the
energetics competition among them. We also discuss the origin and the
experimental implications of the curious Chern insulator at nu_h = 2.
We study the properties of 2+1d conformal field theories (CFTs) in a
background magnetic field. Using generalized particle-vortex duality, we argue
that in many cases of interest the theory becomes gapped, which allows us to
make a number of predictions for the magnetic response, background monopole
operators, and more. Explicit calculations at large N for Wilson-Fisher and
Gross-Neveu CFTs support our claim, and yield the spectrum of background
(defect) monopole operators. Finally, we point out that other possibilities
exist: certain CFTs can become metallic in a magnetic field. Such a scenario
occurs for a Dirac fermion coupled to a Chern-Simons gauge field, where a
non-Fermi liquid is argued to emerge.
Trions are a three-particle bound state of electrons and holes. Experimental
realization of a trion liquid in the degenerate quantum limit would open a wide
range of phenomena in quantum many-body physics. However, trions have been
observed only as optically excited states in doped semiconductors to date. Here
we report the emergence of a degenerate trion liquid in a Bose-Fermi mixture of
holes and excitons in Coulomb-coupled MoSe2/WSe2 monolayers. By electrically
tuning the hole density in WSe2 to be two times the electron density in MoSe2,
we generate equilibrium interlayer trions with binding energy about 1 meV at
temperatures two orders of magnitude below the Fermi temperature. We further
demonstrate a density-tuned phase transition to an electron-hole plasma,
spin-singlet correlations for the constituent holes and Zeeman-field-induced
dissociation of trions. The results pave the way for exploration of the
correlated phases of composite particles in solids.
Chiral exact flat bands (FBs) at charge neutrality have attracted much recent
interest, presenting an intriguing condensed-matter system to realize exact
many-body phenomena, as specifically shown in "magic angle" twisted bilayer
graphene for superconductivity and triangulene-based superatomic graphene for
excitonic condensation. Yet, no generic physical model to realize such FBs has
been developed. Here we present a new mathematical theorem, called bipartite
double cover (BDC) theorem, and prove that the BDC of line-graph (LG) lattices
hosts at least two chiral exact FBs of opposite chirality, i.e., yin-yang FBs,
centered-around/at charge neutrality (E = 0) akin to the "chiral limit" of
twisted bilayer graphene. We illustrate this theorem by mapping it exactly onto
tight-binding lattice models of the BDC of LGs of hexagonal lattice for strong
topological and of triangular lattice for fragile topological FBs,
respectively. Moreover, we use orbital design principle to realize such exotic
yin-yang FBs in non-BDC lattices to instigate their real material discovery.
This work not only enables the search for exact chiral FBs at zero energy
beyond moir\'e heterostructures, but also opens the door to discovering quantum
semiconductor features with FB-enabled strongly correlated carriers.
The occurrence of charge-density-wave (CDW) order is a common thread in the
phase diagram of cuprate high-transition-temperature ($T_c$) superconductors.
In iron-based superconductors (FeSCs), nematic order and fluctuations play a
decisive role in driving other emergent orders. CDW order has been observed by
scanning tunneling microscopy for various FeSCs such as FeSe thin films,
uniaxially strained LiFeAs, and tetragonal FeSe$_{0.81}$S$_{0.19}$. However, it
remains elusive if the CDW in these materials is a bulk phenomenon as well as
if and how it intertwines with the electronic nematicity. Using energy-resolved
resonant X-ray scattering at the Fe-L$_3$ edge, we report the discovery of a
local-strain-induced incommensurate isotropic CDW order in
FeSe$_{0.82}$S$_{0.18}$. A highly anisotropic CDW response under uniaxial
strain unambiguously manifests that the CDW is directly coupled to the
nematicity. Transforming part of Fe$^{2+}$ to Fe$^{3+}$ on the surface of
{\FSS} reveals that the same isotropic CDW can be induced, enhanced, and
stabilized in the whole nematic regime measured ($x=0-0.19$). As Fe$^{3+}$ can
create local lattice distortions on the surface, the CDW could arise from the
interaction between the local strain around Fe$^{3+}$ and the nematic electron
correlations. Our experimental observation of a local-strain-induced CDW gives
vital information for understanding the interplay between electron correlations
and the electronic nematicity in FeSCs.
We investigate the twisted topology of the complex eigenspectrum of a
one-dimensional non-Hermitian system under the influence of long-range
unidirectional coupling. Unlike the complex energy spectrum of the conventional
Hatano-Nelson chain, which takes the form of a single loop with a topological
winding index of a definite sign, the introduction of long-range unidirectional
hopping results in the creation of multiple twisted loops. These twisted loops
exhibit opposite signs of the topological winding index, which correlate to
alternating clockwise and anticlockwise energy windings. The simultaneous
presence of both signs of the winding index translates into a bipolar
non-Hermitian skin effect (NHSE), which challenges the conventional wisdom that
the NHSE localization is dependent on the direction of the dominant
nearest-neighbor interactions. In this bipolar NHSE, the exponents of the
complex energy eigenvectors corresponding to clockwise and anti-clockwise
windings, lie inside and outside of the complex unit circle, respectively.
Interestingly, at the intersections of oppositely oriented energy loops where
the sign of the topological winding index flips, the energy becomes
real-valued, leading to a suppression of the NHSE. This marks the emergence of
Bloch-like contact points, where both the bipolar NHSE and the traditional NHSE
vanish. Based on the non-Hermitian model we provide analytical insights into
the effects of long-range unidirectional coupling to the winding topology of
its complex energy spectra and their broader implications for the field of
condensed matter physics.
A microscopic control over the origin and dynamics of localised spin centres
in lower dimensional solids turns out to be a key factor for next generation
spintronics and quantum technologies. With the help of low temperature electron
paramagnetic resonance (EPR) measurements, supported by the first-principles
calculations within density functional theory (DFT) formulation, we found the
origin of different high-spin paramagnetic intrinsic charge-centres, Mo3+(4d3)
and Mo2+(4d4) present in the nano-crystalline sulfur deficit hexagonal
molybdenum disulfide (2H-MoS_(2-x)), against the established notion of spin-1/2
, Mo5+ centres. A critical strain generated in the nano-structured 2H-MoS_(2-x)
was found to be very crucial for spin-localization in this layered material.
Indeed, computationally effective proposition of the PBE+U
exchange-correlations within DFT including D3-dispersion corrections found to
be more viable than expensive higher rung of exchange-correlation functionals,
explored earlier. It is also found that the oxygen vacancy of the reduced oxide
phase, embedded in 2H-MoS_(2-x) host lattice, has the longest relaxation times.
Moreover, the temperature dependence of spin-lattice relaxation measurements
reveals a direct process for interstitial spin centres and a Raman process for
both sulfur and oxygen vacancy sites. We expect such observation would be a
valuable pillar for better understanding of the next generation quantum
technologies and device applications.
In the quest of new absorbent for hydrogen storage, we investigate the
capacities of slit pores formed by two BC3 sheets decorated with Li atoms.
Their hydrogen storage capacities are determined using density-functional
theory in conjunction with a quantum-thermodynamic model that allows to
simulate real operating conditions, i.e., finite temperatures and different
loading and depletion pressures applied to the adsorbent in the charge-delivery
cycles. We show that the capacities of the adsorbed hydrogen phase of
Li-decorated BC3 slit pores are larger than those reported recently for
graphene and Li-decorated borophene slit pores. On the other hand, the usable
volumetric and gravimetric capacities of Li-decorated BC3 slit pores can meet
the targets stipulated by the U.S. Department of Energy (DOE) for onboard
hydrogen storage at moderate temperatures and loading pressures well below
those used in the tanks employed in current technology. In particular, the
usable volumetric capacity for pore widths of about 10 {\AA} meets the DOE
target at a loading pressure of 6.6 MPa when depleting at ambient pressure. Our
results highlight the important role played by the rotational degree of freedom
of the H2 molecule in determining the confining potential within the slip pores
and their hydrogen storage capacities.
While Bernal stacked bilayer graphene bears two distinct atom types in its
lattice, there exists no analytical framework addressing the number of atomic
environments that emerge in twisted bilayer graphene superlattices. In this
work, we have computationally analyzed 120 different twisted bilayer
superlattices using descriptor functions to study the emergent local
environments. Our study reveals that the number of atoms with unique local
environments depend on the superlattice size linearly. Moreover, this linear
dependence manifests itself on two distinct lines and this automatically
suggests a new classification scheme based on the local environments. As a
possible application, the use of local environments in the investigation of
vibrational properties is discussed with respect to the existing literature.
Molecular dynamics simulations are performed to calculate the phonon density of
states of the 120 structures as well as the local phonon density of states of
their individual atoms. The similarity of the contributions of local density of
states coming from atoms with the same local environment is demonstrated. Local
density of states of the atoms with unique local environments of an arbitrary
selection of the structures is then used to train a machine learning model.
This model is used to predict the phonon spectra of twisted bilayer structures.
Performance of the trained model is discussed thoroughly via different
selection of training and test sets, and it is shown that the model proves
effective in predicting the vibrational properties of any given twisted bilayer
structure. The possible applications of the generic method presented which
reaches far beyond twisted bilayer graphene is also discussed.
Topological quantum phases have been largely understood in weakly correlated
systems, which have identified various quantum phenomena such as spin Hall
effect, protected transport of helical fermions, and topological
superconductivity. Robust ferromagnetic order in correlated topological
materials particularly attracts attention, as it can provide a versatile
platform for novel quantum devices. Here, we report singular Hall response
arising from a unique band structure of flat topological nodal lines in
combination with electron correlation in an itinerant, van der Waals
ferromagnetic semimetal, Fe3GaTe2, with a high Curie temperature of Tc=360 K.
High anomalous Hall conductivity violating the conventional scaling,
resistivity upturn at low temperature, and a large Sommerfeld coefficient are
observed in Fe3GaTe2, which implies heavy fermion features in this
ferromagnetic topological material. Our circular dichroism in angle-resolved
photoemission spectroscopy and theoretical calculations support the original
electronic features in the material. Thus, low-dimensional Fe3GaTe2 with
electronic correlation, topology, and room-temperature ferromagnetic order
appears to be a promising candidate for robust quantum devices.
In classes of Weyl semimetals where the symmetry protects nodes with higher
than unit charge, the nematic Weyl liquid appears as interactions destroy this
underlying symmetry. In the symmetry-broken phase, the multiple-charge nodes
are split into objects of unit charge, the position of which in momentum space
is determined by the nematic order parameter. We examine the phenomenology of
this phase, focusing on topological edge states and Landau levels. We find that
the symmetry-broken phase itself, as well as the orientation of the nematic
order, are identifiable from the resulting edge states. We also find that the
nematic order couples to an in-plane magnetic field, indicating that it can be
controlled in situ via an external field. Finally, we provide an estimate for
the critical coupling where spontaneous symmetry-breaking occurs for contact
interaction.
Heterostructures composed of pentacene (PEN) molecules and transition metal
dichalchogenides (TMDs) are promising materials for small, flexible and
lightweight photovoltaic devices and various other optoelectronic applications.
The effects of changing concentration and orientation of adsorbed pentacene
molecules on two-dimensional monolayer substrates of TMDs, namely MoS$_2$,
MoSe$_2$, WS$_2$ and WSe$_2$, were investigated using first-principles
calculations based on density functional theory. We examined the structural and
electronic properties of the corresponding PEN/TMD heterostructures and
compared these between differing pentacene concentrations and the orientations
of pentacene with respect to the underlying substrate crystal structure. We
analyse the band alignment of the heterostructures and demonstrate a
concentration-dependent staggered-to-straddling (typeII-I) band gap transition
in PEN/MoSe$_2$
Multiple software packages currently exist for the computation of bulk
topological invariants in both idealized tight-binding models and realistic
Wannier tight-binding models derived from density functional theory. Currently,
only one package, PythTB(https://www.physics.rutgers.edu/pythtb/) is capable of
computing nested Wilson loops and spin-resolved Wilson loops. These
state-of-the-art techniques are vital for accurate analysis of band topology.
In this paper we introduce BerryEasy, a python package which is built to work
alongside the PyBinding(https://docs.pybinding.site/en/stable/index.html)
software package. By working in tandem with the Pybinding package and
harnessing the speed of graphical processing units, topological analysis of
supercells in the presence of disorder and impurities is made possible. The
BerryEasy package simultaneously accommodates use of realistic tight-binding
models developed using Wannier90.
The supercurrent field effect is experimentally realized in various
nano-scale devices, based on the superconductivity suppression by external
electric fields being effective for confined systems. In spite of intense
research, a microscopic theory and explanation of this effect is missing. Here,
a microscopic theory of phonon-mediated superconductivity in thin films is
presented, which accounts for the effect of quantum confinement on the
electronic density of states, on the Fermi energy, and on the topology of
allowed states in momentum space. By further accounting for the interplay
between quantum confinement, the external static electric field, the
Thomas-Fermi screening in the electron-phonon matrix element, and the effect of
confinement on the Coulomb repulsion parameter, the theory predicts the
critical value of the external electric field as a function of the film
thickness, above which superconductivity is suppressed. In particular, this
critical value of the electric field is the lower the thinner the film, in
agreement with recent experimental observations. Crucially, this effect is
predicted by the theory when both Thomas-Fermi screening and the Coulomb
pseudopotential are taken into account, along with the respective dependence on
thin film thickness. This microscopic theory of the supercurrent field-effect
opens up new possibilities for electric-field gated quantum materials.
Numerical analysis of conserved field dynamics has been generally performed
with pseudo spectral methods. Finite differences integration, the common
procedure for non-conserved field dynamics, indeed struggles to implement a
conservative noise in the discrete spatial domain. In this work, we present a
novel method to generate a conservative noise in the finite differences
framework, which works for any discrete topology and boundary conditions. We
apply it to numerically solve the conserved Kardar-Parisi-Zhang (cKPZ)
equation, widely used to describe surface roughening when the number of
particles is conserved. Our numerical simulations recover the correct scaling
exponents $\alpha$, $\beta$, and $z$ in $d=1$ and in $d=2$. To illustrate the
potentiality of the method, we further consider the cKPZ equation on different
kinds of non-standard lattices and on the random Euclidean graph. This is the
first numerical study of conserved field dynamics on an irregular topology,
paving the way to a broad spectrum of possible applications.
Using the in-in formalism, we generalize the recently constructed
magnetoelastic EFT arXiv:2112.13873 [hep-th] to describe the damping dynamics
of ferromagnetic systems at long wavelengths. We find that the standard Gilbert
damping term naturally arises as the simplest leading-order symmetry-consistent
non-conservative contribution within the in-in framework. The EFT is easily
generalized to scenarios with anisotropy and inhomogeneity. In particular, we
find the classic Landau-Lifshitz damping term emerges when isotropy is broken
by a constant external background field. This provides a first principle
explanation for distinguishing the two types of damping dynamics that were
originally constructed phenomenologically. Furthermore, the EFT framework could
also incorporate intrinsic anisotropy of the material in a straightforward way
using the spurion method. For systems with inhomogeneity such as nontrivial
spin textures, we find that the leading order derivative correction yields the
generalized Gilbert damping equations that were found in condensed matter
literature. This shows that the EFT approach enables us to derive the form of
higher-derivative-order corrections in a systematic way. Lastly, using the
phonon-magnon coupling deduced in the magnetoelastic EFT, we are able to make a
prediction for the generic form of the phononic contribution to the damping
equation.
Adiabatic processes can keep the quantum system in its instantaneous
eigenstate, which is robust to noises and dissipation. However, it is limited
by sufficiently slow evolution. Here, we experimentally demonstrate the
transitionless quantum driving (TLQD) of the shortcuts to adiabaticity (STA) in
gate-defined semiconductor quantum dots (QDs) to greatly accelerate the
conventional adiabatic passage for the first time. For a given efficiency of
quantum state transfer, the acceleration can be more than 2-fold. The dynamic
properties also prove that the TLQD can guarantee fast and high-fidelity
quantum state transfer. In order to compensate for the diabatic errors caused
by dephasing noises, the modified TLQD is proposed and demonstrated in
experiment by enlarging the width of the counter-diabatic drivings. The
benchmarking shows that the state transfer fidelity of 97.8% can be achieved.
This work will greatly promote researches and applications about quantum
simulations and adiabatic quantum computation based on the gate-defined QDs.
We present the non-linear DC photoconductivity of graphene under strong
infra-red (IR) radiation. The photoconductivity is obtained as the response to
a strong DC electric field, with field strengths outside of the linear-response
regime, while the IR radiation is described by a strong AC electric field. The
conductivity displays two distinct regimes in which either the DC or the AC
field dominates. We explore these regimes and associate them with the dynamics
of driven Landau-Zener quenches in the case of a large DC field. In the limit
of large AC field, we describe the conductivity in a Floquet picture and
compare the results to the closely related Tien-Gordon effect. We present
analytical calculations for the non-linear differential photoconductivity, for
both regimes based on the corresponding mechanisms. As part of this discussion
of the non-equilibrium state of graphene, we present analytical estimates of
the conductivity of undriven graphene as a function of temperature and DC bias
field strength that show very good agreement with our simulations.
We introduce a real-space slave rotor theory of the physics of topological
Mott insulators, using the Kane-Mele-Hubbard model as an example, and use it to
show that a topological gap in the Green function zeros corresponds to a gap in
the bulk spinon spectrum and that a zero edge mode corresponds to a spinon edge
mode. We then consider an interface between a topological Mott insulator and a
conventional topological insulator showing how the spinon edge mode of the
topological Mott insulator combines with the spin part of the conventional
electron topological edge state leaving a non-Fermi liquid edge mode described
by a gapless propagating holon and gapped spinon state. Our work demonstrates
the physical meaning of Green function zeros and shows that interfaces between
conventional and Mott topological insulators are a rich source of new physics.
Generalized Baxter's TQ-relations and the QQ-system are systems of algebraic
relations in the category O of representations of the Borel subalgebra of a
quantum affine algebra U_q(g^), which we established in our earlier works
arXiv:1308.3444 and arXiv:1606.05301. In the present paper, we conjecture a
family of analogous relations labeled by elements of the Weyl group W of g, so
that the original relations correspond to the identity element. These relations
are closely connected to the W-symmetry of q-characters established in
arXiv:2211.09779. We prove these relations for all w in W if g has rank two,
and we prove the extended TQ-relations if w is a simple reflection. We also
generalize our results and conjectures to the shifted quantum affine algebras.
Although free-fermion systems are considered exactly solvable, they
generically do not admit closed expressions for nonlocal quantities such as
topological string correlations or entanglement measures. We derive closed
expressions for such quantities for a dense subclass of certain classes of
topological fermionic wires (classes BDI and AIII). Our results also apply to
spin chains called generalised cluster models. While there is a bijection
between general models in these classes and Laurent polynomials, restricting to
polynomials with degenerate zeros leads to a plethora of exact results: (1) we
derive closed expressions for the string correlation functions - the order
parameters for the topological phases in these classes; (2) we obtain an exact
formula for the characteristic polynomial of the correlation matrix, giving
insight into ground state entanglement; (3) the latter implies that the ground
state can be described by a matrix product state (MPS) with a finite bond
dimension in the thermodynamic limit - an independent and explicit construction
for the BDI class is given in a concurrent work [Phys. Rev. Res. 3 (2021),
033265, 26 pages, arXiv:2105.12143]; (4) for BDI models with even integer
topological invariant, all non-zero eigenvalues of the transfer matrix are
identified as products of zeros and inverse zeros of the aforementioned
polynomial. General models in these classes can be obtained by taking limits of
the models we analyse, giving a further application of our results. To the best
of our knowledge, these results constitute the first application of Day's
formula and Gorodetsky's formula for Toeplitz determinants to many-body quantum
physics.
We propose a novel machine learning method for sampling from the
high-dimensional probability distributions of Lattice Field Theories, which is
based on a single neural ODE layer and incorporates the full symmetries of the
problem. We test our model on the $\phi^4$ theory, showing that it
systematically outperforms previously proposed flow-based methods in sampling
efficiency, and the improvement is especially pronounced for larger lattices.
Furthermore, we demonstrate that our model can learn a continuous family of
theories at once, and the results of learning can be transferred to larger
lattices. Such generalizations further accentuate the advantages of machine
learning methods.
Additive manufacturing technologies enable the production of complex and
bioinspired shapes using magneto-responsive materials, which find diverse
applications in soft robotics. Particularly, the development of composites with
controlled gradients in mechanical properties offers new prospects for
advancements in magneto-active materials. However, achieving such composites
with gradients typically involves complex multi-material printing procedures.
In this study, a single-step laser powder bed fusion (LPBF) process is proposed
that enables precise local adjustments of the mechanical stiffness within
magneto-active composites. By utilizing distinct laser parameters in specific
regions of a composite containing thermoplastic polyurethane and atomized
magnetic powder derived from hard magnetic Nd-Fe-B, the stiffness of the
composite can be modified within the range of 2 to 22 MPa. Various
magneto-responsive actuators with locally tailored stiffness are fabricated and
their magnetic performance is investigated. The enhanced response exhibited by
actuators with locally adjusted mechanical properties in comparison to their
homogeneous counterparts with identical geometries is shown. As a demonstration
of a biomedical application, a magnetically responsive stent with localized
adjustment is presented with the ability to meet specific requirements in terms
of geometry and local stiffness based on an individual's anatomy and disease
condition. The proposed method presents an approach for creating functionally
graded materials using LPBF, not only for magneto-active materials but also for
several other structural and functional materials.
We study possible patterns for spontaneous symmetry breaking in a Dirac
fermion model, which is applicable to twisted bilayer graphene at charge
neutrality. We show how a chiral SU(4) symmetry emerges and construct the
corresponding low-energy model that includes a Fierz-complete set of
symmetry-allowed four-fermion interactions. We employ an unbiased
renormalization group treatment to identify the critical points that describe
transitions into different ordered phases. The resulting phase diagram depends
on the number of fermion flavours and we show that the coupling between
ordering channels prevents many of the possible mean-field orders from being
accessible at relevant, small flavour numbers. We argue that, as a consequence,
twisted bilayer graphene is governed by a quantum Hall state or an SU(4)
manifold of insulating spin-valley orders with emergent Lorentz symmetry that
contains inter-valley coherent, spin Hall, and valley Hall states. We study how
SU(4)-breaking perturbations affect the accessibility and can additionally
stabilize symmetry-broken (semi-)metallic states.
Optical resonators are a powerful platform to control the spontaneous
emission dynamics of excitons in solid-state nanostructures. Here, we study a
MoSe$_2$-WSe$_2$ van-der-Waals heterostructure that is integrated in a widely
tunable open optical microcavity to gain insights into fundamental optical
properties of the emergent interlayer charge-transfer excitons. First, we
utilize an ultra-low quality factor open planar vertical cavity and investigate
the modification of the excitonic lifetime as on- and off-resonant conditions
are met with consecutive longitudinal modes. Time-resolved photoluminescence
measurements reveal that the interlayer exciton lifetime can thus be
periodically tuned with an amplitude of 110 ps. The resulting oscillations of
the interlayer exciton lifetime allows us to extract a 0.5 ns free-space
radiative lifetime and a quantum efficiency as high as 81 \%. We subsequently
engineer the local density of optical states by introducing a spatially
confined and fully spectrally tunable Tamm-plasmon resonance. The dramatic
redistribution of the local optical modes in this setting allows us to
encounter a profound inhibition of spontaneous emission of the interlayer
excitons by a factor of 3.2. We expect that specifically engineering the
inhibition of radiation from moir\'e excitons is a powerful tool to steer their
thermalization, and eventually their condensation into coherent condensate
phases.
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 an alternative 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, and 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.
We use the Becchi-Rouet-Stora-Tyutin (BRST) method to quantize the $t$-$J$
model in the $U(1)$ gauge slave boson representation. While the temporal
component of the gauge field plays a role of a Lagrange multiplier to enforce
the no double occupancy constraint, the spatial components do that to enforce
the vanishing counterflow constraints of the spinon and holon currents. These
constraints on the ordered states of the $t$-$J$ model belong to Dirac's
second-class constraints. The BRST quantization theory which is consistent with
the second-class constraints was not built in literature. We successfully
develop such a BRST quantization theory in which the gauge invariance is
guaranteed and the redundant gauge degrees of freedom are removed by proper
gauge fixing conditions while the no double occupancy and vanishing counterflow
constraints are exactly retained. Furthermore, the gauge fixing conditions
endow the gauge field with dynamics. This turns the strongly correlated
electron model into a weakly coupled slave boson model, most of whose physical
observable can be calculated by the conventional quantum many-body perturbation
theory. We focus on the properties of the strange metal phase in the $t$-$J$
model. The electron momentum distribution and the spectral function are
calculated, and their non-Fermi liquid behaviors agree with the angle resolved
photoemission spectroscopy measurements for the cuprate materials. We also
study the responses of the strange metal state to the external electromagnetic
fields. The non-Fermi liquid anomalies observed in cuprates are captured by our
calculations. Especially, we find that the Hall resistivity decreases as
temperature raises and the sign of the Hall resistivity varies from negative to
positive when the dopant concentration varies from the optimal doping one to
underdoping one for the temperature $T>T^*$.
In twisted MoTe$_{2}$, latest transport measurement has reported observation
of quantum anomalous Hall effect at hole filling $\nu=-1$, which undergoes a
topological phase transition to a trivial ferromagnet as layer hybridization
gets suppressed by interlayer bias $D$. Here we show that this underlies the
existence of an orbital Chern insulating state with gate ($D$) switchable sign
in an antiferromagtic spin background at hole filling $\nu=-2$. From
momentum-space Hartree Fock calculations, we find this state has a topological
phase diagram complementary to that of the $\nu=-1$ one: by sweeping $D$ from
negative to positive, the Chern number of this $\nu=-2$ state can be switched
between $+1$, $0$, and $-1$, accompanied by a sign change of a sizable orbital
magnetization. In range of $D$ where this antiferronagnet is the ground state,
the orbital magnetization allows magnetic field initialization of the spin
antiferromagnetic order and the Chern number.
In Landau's Fermi liquid picture, transport is governed by scattering between
quasi-particles. The normal liquid $^3$He conforms to this picture but only at
very low temperature. Here, we observe that the deviation from the standard
behavior is concomitant with the fermion-fermion scattering time falling below
the Planckian time, $\frac{\hbar}{k_{\rm B}T}$. We also observe that thermal
diffusivity of this quantum liquid is bounded by a minimum set by fundamental
physical constants, similarly to what was observed in classical liquids
earlier. This points to collective excitations (a sound mode) as carriers of
heat. We propose that this mode has a wavevector of 2$k_F$ and a mean free path
equal to the de Broglie thermal length. This would provide an additional
conducting channel with a $T^{1/2}$ temperature dependence, matching what is
observed by experiments. Within a margin of 10\%, the experimental data from
0.007 K to 3 K can be accounted for if thermal conductivity is the sum of
contributions from quasiparticles and sound: $\kappa=\kappa_{qp}+\kappa_s$;
$\kappa_{qp}\propto T^{-1}$; $\kappa_s\propto T^{1/2}$.
We recently showed that spin fluctuations of noncoplanar magnetic states can
induce topological superconductivity in an adjacent normal metal [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. Symmetry arguments
are applied to complement this discussion. 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.
The recent claim of room temperature superconductivity in a copper-doped lead
apatite compound, called LK-99, has sparked remarkable interest and
controversy. Subsequent experiments have largely failed to reproduce the
claimed superconductivity, while theoretical works have identified multiple key
features including strong electronic correlation, structural instabilities, and
dopability constraints. A puzzling claim of several recent theoretical studies
is that both parent and copper-doped lead apatite structures are dynamically
unstable at the harmonic level, questioning decades of experimental reports of
the parent compound structures and the recently proposed copper-doped
structures. In this work, we demonstrate that both parent and copper-doped lead
apatite structures are dynamically stable at room temperature. Anharmonic
phonon-phonon interactions play a key role in stabilizing some copper-doped
phases, while most phases are largely stable even at the harmonic level. We
also show that dynamical stability depends on both volume and correlation
strength, suggesting controllable ways of exploring the copper-doped lead
apatite structural phase diagram. Our results fully reconcile the theoretical
description of the structures of both parent and copper-doped lead apatite with
experiment.
Covalent Organic Frameworks (COFs) have gained significant popularity in
recent years due to their unique ability to provide a high surface area and
customizable pore geometry and chemistry. These traits make COFs a highly
promising choice for a range of applications. However, with their vast
potential structures, exploring COFs experimentally can be challenging and
time-consuming, yet it remains an attractive avenue for computational
high-throughput studies. However, generating COF structures can be a
time-consuming and challenging task. To address this challenge, here we
introduce the pyCOFBuilder, an open-source Python package designed to
facilitate the generation of COF structures for computational studies. The
pyCOFBuilder software provides an easy-to-use set of functionalities to
generate COF structures following the reticular approach. In this paper, we
describe the implementation, main features, and capabilities of the
pyCOFBuilder demonstrating its utility for generating COF structures with
varying topologies and chemical properties. pyCOFBuilder is freely available on
GitHub at https://github.com/lipelopesoliveira/pyCOFBuilder.
We investigate the influence of local decoherence on a symmetry-protected
topological (SPT) phase of the two-dimensional (2D) cluster state. Mapping the
2D cluster state under decoherence to a classical spin model, we show a
topological phase transition of a
$\mathbb{Z}_2^{(0)}\times\mathbb{Z}_{2}^{(1)}$ SPT phase into the trivial phase
occurring at a finite decoherence strength. To characterize the phase
transition, we employ three distinct diagnostic methods, namely, the relative
entropy between two decohered SPT states with different topological edge
states, the strange correlation function of $\mathbb{Z}_2^{(1)}$ charge, and
the multipartite negativity of the mixed state on a disk. All the diagnostics
can be obtained as certain thermodynamic quantities in the corresponding
classical model, and the results of three diagnostic tests are consistent with
each other. Given that the 2D cluster state possesses universal computational
capabilities in the context of measurement-based quantum computation, the
topological phase transition found here can also be interpreted as a transition
in the computational power.
This work is concerned with tree tensor network operators (TTNOs) for
representing quantum Hamiltonians. We first establish a mathematical framework
connecting tree topologies with state diagrams. Based on these, we devise an
algorithm for constructing a TTNO given a Hamiltonian. The algorithm exploits
the tensor product structure of the Hamiltonian to add paths to a state
diagram, while combining local operators if possible. We test the capabilities
of our algorithm on random Hamiltonians for a given tree structure.
Additionally, we construct explicit TTNOs for nearest neighbour interactions on
a tree topology. Furthermore, we derive a bound on the bond dimension of tensor
operators representing arbitrary interactions on trees. Finally, we consider an
open quantum system in the form of a Heisenberg spin chain coupled to bosonic
bath sites as a concrete example. We find that tree structures allow for lower
bond dimensions of the Hamiltonian tensor network representation compared to a
matrix product operator structure. This reduction is large enough to reduce the
number of total tensor elements required as soon as the number of baths per
spin reaches $3$.
Interfaces play a crucial role in determining the overall performance and
functionality of electronic devices and systems. Driven by the data science,
machine learning (ML) reveals excellent guidance for material selection and
device design, in which an advanced database is crucial for training models
with state-of-the-art (SOTA) precision. However, a systematic database of
interfaces is still in its infancy due to the difficulties in collecting raw
data in experiment and the expensive first-principles computational cost in
density functional theory (DFT). In this paper, we construct ample interface
structures of graphene nanoribbons (GNR), whose interfacial morphology can be
precisely fabricated based on specific molecular precursors. The GNR interfaces
serve as promising candidates since their bandgaps can be modulated. Their
physical properties including energy bands and density of states (DOS) maps are
obtained under reasonable calculation parameters. This database can provide
theoretical guidance for the design of electronic devices and accelerate the ML
study of various physical quantities.
Kitaev interactions, arising from the interplay of frustration and bond
anisotropy, can lead to strong quantum fluctuations and, in an ideal case, to a
quantum-spin-liquid state. However, in many nonideal materials, spurious
non-Kitaev interactions typically promote a zigzag antiferromagnetic order in
the d-orbital transition metal compounds. By combining neutron scattering with
muon-spin rotation and relaxation techniques, we provide new insights into the
exotic properties of Na2Co2TeO6, a candidate Kitaev material. Below TN, the
zero-field muon-spin relaxation rate becomes almost constant (at 0.45 us-1). We
attribute this temperature-independent muon-spin relaxation rate to the strong
quantum fluctuations, as well as to the frustrated Kitaev interactions. As the
magnetic field increases, neutron scattering data indicate a much broader
spin-wave-excitation gap at the K-point. Therefore, quantum fluctuations seem
not only robust, but are even enhanced by the applied magnetic field. Our
findings provide valuable hints for understanding the onset of the
quantum-spin-liquid state in Kitaev materials.
Before this study, we observed an intriguing occurrence of two-dimensional
(2D) superconductivity in two heterostructures, Bi$_2$Te$_3$/FeTe and
Sb$_2$Te$_3$/FeTe, which consist of a topological insulator (TI) on top and
FeTe on the bottom. The objective of this study was to create an inverted
version of the Bi$_2$Te$_3$/FeTe (BT-FT) heterostructure, called
FeTe/Bi$_2$Te$_3$ (FT-BT). Through in-situ reflection high-energy electron
diffraction (RHEED), high-resolution x-ray diffraction (HRXRD) profiling and
cross-sectional scanning transmission electron microscopy (STEM) imaging
studies, it was found that at a relatively high growth temperature, FeTe grown
on Bi$_2$Te$_3$ led to the extraction of Te from the Bi$_2$Te$_3$ layer,
resulting the formation of Bi$_4$Te$_3$ as the bottom layer. This is attributed
to the more negative formation energy of FeTe compared to that of Bi$_2$Te$_3$.
In addition, a nearly ideal heterostructure of FeTe/Bi$_2$Te$_3$ was
successfully fabricated at a lower growth temperature of FeTe with certain Fe
and Te cell temperatures. This heterostructure exhibits superconductivity at
approximately 12K. These studies present a new approach to realizing the
Bi$_4$Te$_3$ component of the Bi-Te system, which could potentially be used to
generate other components within the Bi-Te system. The realization of the
FeTe/Bi$_2$Te$_3$ inverted heterostructure creates a platform for configuring
structures with multiple interfaces between Bi$_2$Te$_3$ and FeTe. This is
expected to enhance superconductivity due to its more three-dimensional nature.

Date of feed: Thu, 21 Dec 2023 01:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Nonlinear Thermoelectric Probes of Anomalous Dynamics in Topological Fermi Liquids. (arXiv:2312.12520v1 [cond-mat.mes-hall])**

Johannes Hofmann, Habib Rostami

**Topology, magnetism and charge order in twisted MoTe2 at higher integer hole fillings. (arXiv:2312.12531v1 [cond-mat.str-el])**

Taige Wang, Minxuan Wang, Woochang Kim, Steven G. Louie, Liang Fu, Michael P. Zaletel

**Conformal field theories in a magnetic field. (arXiv:2312.12546v1 [hep-th])**

Rufus Boyack, Luca V. Delacrétaz, Éric Dupuis, William Witczak-Krempa

**A degenerate trion liquid in atomic double layers. (arXiv:2312.12571v1 [cond-mat.mes-hall])**

Phuong X. Nguyen, Raghav Chaturvedi, Liguo Ma, Patrick Knuppel, Kenji Watanabe, Takashi Taniguchi, Kin Fai Mak, Jie Shan

**Graph Theorem for Chiral Exact Flat Bands at Charge Neutrality. (arXiv:2312.12607v1 [cond-mat.mtrl-sci])**

Gurjyot Sethi, Bowen Xia, Dongwook Kim, Hang Liu, Xiaoyin Li, Feng Liu

**Nematic charge-density-wave correlations in FeSe$_{1-x}$S$_{x}$. (arXiv:2312.12749v1 [cond-mat.supr-con])**

Ruixian Liu, Wenliang Zhang, Yuan Wei, Zhen Tao, Teguh C. Asmara, Vladimir N. Strocov, Thorsten Schmitt, Xingye Lu

**Twisted topology and Bipolar Non-Hermitian Skin Effect induced by long-range asymmetric coupling. (arXiv:2312.12780v1 [cond-mat.mes-hall])**

S. M. Rafi-Ul-Islam, Zhuo Bin Siu, Haydar Sahin, Md. Saddam Hossain Razo, Mansoor B. A. Jalil

**Strain-driven Charge Localisation and Spin Dynamics of Paramagnetic Defects in S-deficit 2H-MoS2 Nanocrystals. (arXiv:2312.12805v1 [cond-mat.mtrl-sci])**

Sudipta Khamrui, Kamini Bharti, Daniella Goldfarb, Tilak Das, Debamalya Banerjee

**Li-decorated BC3 nanopores: Promising materials for hydrogen storage. (arXiv:2312.12841v1 [cond-mat.mtrl-sci])**

I. Cabria, A. Lebon, M. B. Torres, L. J. Gallego, A. Vega

**Emergent Atomic Environments in Twisted Bilayer Graphene and Their Use in the Prediction of the Vibrational Properties. (arXiv:2312.12864v1 [cond-mat.mtrl-sci])**

Dilara Ickecan, Yunus Emre Okyayli, Erdi Ata Bleda, Dogan Erbahar

**Singular Hall response from a correlated ferromagnetic flat nodal-line semimetal. (arXiv:2312.12889v1 [cond-mat.str-el])**

Woohyun Cho, Yoon-Gu Kang, Jaehun Cha, Dong Hyun David Lee, Do Hoon Kiem, Jaewhan Oh, Jongho Park, Changyoung Kim, Yongsoo Yang, Yeong Kwan Kim, Myung Joon Han, Heejun Yang

**Fermi arcs, Landau levels and magnetic response of the nematic Weyl liquid. (arXiv:2312.12920v1 [cond-mat.str-el])**

Carlos Naya, Tommaso Bertolini, Johan Carlström

**Effect of molecular rotation and concentration on the adsorption of pentacene molecules on two-dimensional monolayer transition metal dichalcogenides. (arXiv:2312.13025v1 [cond-mat.mtrl-sci])**

Edward Black, Juliana Morbec

**BerryEasy: A GPU enabled python package for diagnosis of $n$-th-order and spin-resolved topology in the presence of fields and effects. (arXiv:2312.13051v1 [cond-mat.mtrl-sci])**

Alexander C. Tyner

**Theory of superconductivity in thin films under an external electric field. (arXiv:2312.13059v1 [cond-mat.supr-con])**

Alessio Zaccone, Vladimir M. Fomin

**From noise on the sites to noise on the links: discretizing the conserved Kardar-Parisi-Zhang equation in real space. (arXiv:2312.13065v1 [cond-mat.stat-mech])**

Andrea Cavagna, Javier Cristín, Irene Giardina, Mario Veca

**An effective field theory of damped ferromagnetic systems. (arXiv:2312.13093v1 [hep-th])**

Jingping Li

**Accelerated adiabatic passage of a single electron spin qubit in quantum dots. (arXiv:2312.13135v1 [cond-mat.mes-hall])**

Xiao-Fei Liu, Yuta Matsumoto, Takafumi Fujita, Arne Ludwig, Andreas D. Wieck, Akira Oiwa

**Non-linear photoconductivity of strongly driven graphene. (arXiv:2312.13217v1 [cond-mat.mes-hall])**

Lukas Broers, Ludwig Mathey

**Edge zeros and boundary spinons in topological Mott insulators. (arXiv:2312.13226v1 [cond-mat.str-el])**

Niklas Wagner, Daniele Guerci, Andrew J. Millis, Giorgio Sangiovanni

**Extended Baxter relations and QQ-systems for quantum affine algebras. (arXiv:2312.13256v1 [math.QA])**

Edward Frenkel, David Hernandez

**Exact correlations in topological quantum chains. (arXiv:2105.13359v3 [quant-ph] UPDATED)**

Nick G. Jones, Ruben Verresen

**Learning Lattice Quantum Field Theories with Equivariant Continuous Flows. (arXiv:2207.00283v3 [hep-lat] UPDATED)**

Mathis Gerdes, Pim de Haan, Corrado Rainone, Roberto Bondesan, Miranda C. N. Cheng

**Magneto-active composites with locally tailored stiffness produced by laser powder bed fusion. (arXiv:2305.02643v2 [physics.app-ph] UPDATED)**

Kilian Schäfer, Matthias Lutzi, Muhammad Bilal Khan, Lukas Schäfer, Konstantin Skokov, Imants Dirba, Sebastian Bruns, Iman Valizadeh, Oliver Weeger, Claas Hartmann, Mario Kupnik, Esmaeil Adabifiroozjaei, Leopoldo Molina-Luna, Oliver Gutfleisch

**Twisted bilayer graphene at charge neutrality: competing orders of SU(4) Dirac fermions. (arXiv:2305.06949v2 [cond-mat.str-el] UPDATED)**

Nikolaos Parthenios, Laura Classen

**In-situ spontaneous emission control of MoSe$_2$-WSe$_2$ interlayer excitons with near-unity quantum yield. (arXiv:2306.15101v2 [cond-mat.mtrl-sci] UPDATED)**

Bo Han, Chirag Chandrakant Palekar, Sven Stephan, Frederik Lohof, Victor Nikolaevich Mitryakhin, Jens-Christian Drawer, Alexander Steinhoff, Lukas Lackner, Martin Silies, Bárbara Rosa, Martin Esmann, Falk Eilenberger, Christopher Gies, Stephan Reitzenstein, Christian Schneider

**Competition between fractional quantum Hall liquid and electron solid phases in the Landau levels of multilayer graphene. (arXiv:2307.14519v2 [cond-mat.mes-hall] UPDATED)**

Rakesh K. Dora, Ajit C. Balram

**Non-Fermi Liquid Behavior of the $t$-$J$ Model in the Strange Metal Phase: $U(1)$ Gauge Theory Consistent with Local Constraints. (arXiv:2308.03074v3 [cond-mat.str-el] UPDATED)**

Long Liang, Yue Yu, Xi Luo

**Orbital Chern Insulator at $\nu=-2$ in Twisted MoTe$_{2}$. (arXiv:2308.11454v2 [cond-mat.str-el] UPDATED)**

Feng-Ren Fan, Cong Xiao, Wang Yao

**How heat propagates in liquid $^3$He. (arXiv:2309.00502v2 [cond-mat.stat-mech] UPDATED)**

Kamran Behnia, Kostya Trachenko

**Topological superconductivity mediated by magnons of helical magnetic states. (arXiv:2309.07211v2 [cond-mat.supr-con] UPDATED)**

Kristian Mæland, Sara Abnar, Jacob Benestad, Asle Sudbø

**On the dynamical stability of copper-doped lead apatite. (arXiv:2309.11541v2 [cond-mat.supr-con] UPDATED)**

Sun-Woo Kim, Kang Wang, Siyu Chen, Lewis J. Conway, G. Lucian Pascut, Ion Errea, Chris J. Pickard, Bartomeu Monserrat

**pyCOFBuilder: A python package for automated creation of Covalent Organic Framework models based on the reticular approach. (arXiv:2310.14822v2 [cond-mat.mtrl-sci] UPDATED)**

Felipe Lopes Oliveira, Pierre Mothé Esteves

**Two-dimensional symmetry-protected topological phases and transitions in open quantum systems. (arXiv:2311.12619v3 [quant-ph] UPDATED)**

Yuxuan Guo, Yuto Ashida

**State Diagrams to determine Tree Tensor Network Operators. (arXiv:2311.13433v2 [quant-ph] UPDATED)**

Richard M. Milbradt, Qunsheng Huang, Christian B. Mendl

**A Novel Interface Database of Graphene Nanoribbon from Density Functional Theory. (arXiv:2311.18203v2 [cond-mat.mtrl-sci] UPDATED)**

Ao Wu, Jiangxue Huang, Qijun Huang, Jin He, Hao Wang, Sheng Chang

**Static magnetic order with strong quantum fluctuations in spin-1/2 honeycomb magnet Na2Co2TeO6. (arXiv:2312.06284v2 [cond-mat.str-el] UPDATED)**

Gaoting Lin, Jinlong Jiao, Xiyang Li, Mingfang Shu, Oksana Zaharko, Toni Shiroka, Tao Hong, Alexander I. Kolesnikov, Guochu Deng, Sarah Dunsiger, Haidong Zhou, Tian Shang, Jie Ma

**Realization of A Superconducting FeTe/Bi$_2$Te$_3$ Heterostructure. (arXiv:2312.10408v2 [cond-mat.supr-con] UPDATED)**

Zhihao He, Tin Seng Manfred Ho, Rolf Lortz, Iam Keong Sou

Found 9 papers in prb Spinel structure ${\mathrm{CuCr}}_{2}{X}_{4}$ where $X$ is a chalcogen are ferromagnetic metals with Curie temperatures at or above room temperature. Experiments show that these compounds can be alloyed with halogens while preserving the ferromagnetic ordering. This alloying changes the carrier conc… Ballistic hot electrons are extracted from a magnetic tunnel junction and injected into a metallic base with energies ranging from 0.65 to 2.8 eV. The energy and wave vector analysis made by a low height Si/Cu Schottky barrier allows one to disentangle the different contributions to the scattering. … Using transient optical spectroscopy, the authors investigate ultrafast optical suppression and recovery of the charge density wave (CDW) in 2$H$-NbSe${}_{2}$, a layered material where CDW and superconductivity coexist. The suppression is marked by the absence of coherent amplitude mode oscillations and a relatively slow, picosecond timescale, different from most typical CDW materials. The suppression of the CDW is only weakly nonthermal and is characterized by an excitation of a large number of phonon degrees of freedom. The recovery of the CDW phase is dominated by slow phonon diffusion. A method is presented that allows for efficient evaluation of spin-orbit coupling (SOC) in density-functional-theory calculations. In the so-called second-variational scheme, where Kohn-Sham functions obtained in a scalar-relativistic calculation are employed as a basis for the spin-orbit-coupled pr… We propose and theoretically investigate a novel Maxwell's demon implementation based on the spin-momentum locking property of topological matter. We use nuclear spins as a memory resource which provides the advantage of scalability. We show that this topological information device can ideally opera… Trimeron lattice excitations in single crystalline magnetite, in the form of $c$ axis switching (i.e., the reorganization of the lattice caused by an external magnetic field) at temperatures below the Verwey temperature ${T}_{\mathrm{V}}$ are observed by magnetization experiments. These excitations … The layered oxychalcogenide semiconductor ${\mathrm{Bi}}_{2}{\mathrm{O}}_{2}\mathrm{Se}$ (BOS) hosts a multitude of unusual properties including high electron mobility. Owing to similar crystal symmetry and lattice constants, the perovskite oxide ${\mathrm{SrTiO}}_{3}$ (STO) has been demonstrated to… Density functional theory calculations are used to systematically investigate the structural and electronic properties of $M{X}_{2}$ transition metal dichalcogenide monolayers with $M$ = Cr, Mo, W and $X$ = S, Se, Te that are doped with single (V, Nb, Ta) and double (Ti, Zr, Hf) acceptor dopants on … In recent years, topology has offered an elegant degree of freedom (DOF) for light and sound manipulation. There exists persistent effort to explore the origin of topological phases based on symmetry, while it becomes rather challenging in complex networks or multiple DOF systems where geometric sym…

Date of feed: Thu, 21 Dec 2023 04:16:56 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) **Giant conductivity anisotropy in cubic ${\mathrm{CuCr}}_{2}{\mathrm{Te}}_{3}\mathrm{I}$ and semiconducting behavior in ${\mathrm{CuCr}}_{2}{\mathrm{S}}_{3}\mathrm{Cl}$ and ${\mathrm{CuCr}}_{2}{\mathrm{Se}}_{3}\mathrm{Br}$**

David J. Singh

Author(s): David J. Singh

[Phys. Rev. B 108, 214422] Published Wed Dec 20, 2023

*sp*- and $d$-band effects on secondary low-energy electron generation

V. Desbuis, D. Lacour, C. Tiusan, W. Weber, and M. Hehn

Author(s): V. Desbuis, D. Lacour, C. Tiusan, W. Weber, and M. Hehn

[Phys. Rev. B 108, 214424] Published Wed Dec 20, 2023

**Unconventional photoinduced charge density wave dynamics in $2H\text{−}{\mathrm{NbSe}}_{2}$**

R. Venturini, A. Sarkar, P. Sutar, Z. Jagličić, Y. Vaskivskyi, E. Goreshnik, D. Mihailovic, and T. Mertelj

Author(s): R. Venturini, A. Sarkar, P. Sutar, Z. Jagličić, Y. Vaskivskyi, E. Goreshnik, D. Mihailovic, and T. Mertelj

[Phys. Rev. B 108, 235160] Published Wed Dec 20, 2023

**Accurate and efficient treatment of spin-orbit coupling via second variation employing local orbitals**

Cecilia Vona, Sven Lubeck, Hannah Kleine, Andris Gulans, and Claudia Draxl

Author(s): Cecilia Vona, Sven Lubeck, Hannah Kleine, Andris Gulans, and Claudia Draxl

[Phys. Rev. B 108, 235161] Published Wed Dec 20, 2023

**Topological information device operating at the Landauer limit**

A. Mert Bozkurt, Alexander Brinkman, and İnanç Adagideli

Author(s): A. Mert Bozkurt, Alexander Brinkman, and İnanç Adagideli

[Phys. Rev. B 108, 235428] Published Wed Dec 20, 2023

**Impact of hydrostatic pressure, nonstoichiometry, and doping on trimeron lattice excitations in magnetite during axis switching**

T. Kołodziej, J. Piętosa, R. Puźniak, A. Wiśniewski, G. Król, Z. Kąkol, I. Biało, Z. Tarnawski, M. Ślęzak, K. Podgórska, J. Niewolski, M. A. Gala, A. Kozłowski, J. M. Honig, and W. Tabiś

Author(s): T. Kołodziej, J. Piętosa, R. Puźniak, A. Wiśniewski, G. Król, Z. Kąkol, I. Biało, Z. Tarnawski, M. Ślęzak, K. Podgórska, J. Niewolski, M. A. Gala, A. Kozłowski, J. M. Honig, and W. Tabiś

[Phys. Rev. B 108, 245148] Published Wed Dec 20, 2023

**Polar discontinuities and interfacial electronic properties of ${\mathrm{Bi}}_{2}{\mathrm{O}}_{2}\mathrm{Se}$ on ${\mathrm{SrTiO}}_{3}$**

Ziye Zhu, Jingshan Qi, Xiaorui Zheng, Xiao Lin, and Wenbin Li

Author(s): Ziye Zhu, Jingshan Qi, Xiaorui Zheng, Xiao Lin, and Wenbin Li

[Phys. Rev. B 108, 245304] Published Wed Dec 20, 2023

**Density functional theory study of the structural and electronic properties of single and double acceptor dopants in $M{X}_{2}$ monolayers**

Yuqiang Gao and Paul J. Kelly

Author(s): Yuqiang Gao and Paul J. Kelly

[Phys. Rev. B 108, 245421] Published Wed Dec 20, 2023

**Robust topological edge states induced by latent mirror symmetry**

Li-Yang Zheng, Yu-Fan Li, Jin Zhang, and Yongsheng Huang

Author(s): Li-Yang Zheng, Yu-Fan Li, Jin Zhang, and Yongsheng Huang

[Phys. Rev. B 108, L220303] Published Wed Dec 20, 2023

Found 1 papers in prl Ergodicity of quantum dynamics is often defined through statistical properties of energy eigenstates, as exemplified by Berry’s conjecture in single-particle quantum chaos and the eigenstate thermalization hypothesis in many-body settings. In this work, we investigate whether quantum systems can exh…

Date of feed: Thu, 21 Dec 2023 04:16:54 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) **Complete Hilbert-Space Ergodicity in Quantum Dynamics of Generalized Fibonacci Drives**

Saúl Pilatowsky-Cameo, Ceren B. Dag, Wen Wei Ho, and Soonwon Choi

Author(s): Saúl Pilatowsky-Cameo, Ceren B. Dag, Wen Wei Ho, and Soonwon Choi

[Phys. Rev. Lett. 131, 250401] Published Wed Dec 20, 2023

Found 1 papers in prx The combined analysis of present and upcoming atmospheric-neutrino experiments may lead to the solution of outstanding puzzles in neutrino physics.

Date of feed: Thu, 21 Dec 2023 04:16:55 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) **Measuring Oscillations with a Million Atmospheric Neutrinos**

C. A. Argüelles, P. Fernández, I. Martínez-Soler, and M. Jin (靳淼辰)

Author(s): C. A. Argüelles, P. Fernández, I. Martínez-Soler, and M. Jin (靳淼辰)

[Phys. Rev. X 13, 041055] Published Wed Dec 20, 2023

Found 2 papers in pr_res Destructive interference between electron wavefunctions on the two-dimensional kagome lattice induces an electronic flat band, which could host a variety of interesting quantum states. Key to realize these proposals is to demonstrate the real-space localization of kagome flat-band electrons. The ext… The Ising model is one of the simplest and most well-established concepts to simulate phase transformations in complex materials. However, its most central constant, the interaction strength $\mathbit{J}$ between two nearest neighbors, is hard to obtain. Here we show how this basic constant can be d…

Date of feed: Thu, 21 Dec 2023 04:16:54 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) **Visualizing the localized electrons of a kagome flat band**

Caiyun Chen, Jiangchang Zheng, Ruopeng Yu, Soumya Sankar, Kam Tuen Law, Hoi Chun Po, and Berthold Jäck

Author(s): Caiyun Chen, Jiangchang Zheng, Ruopeng Yu, Soumya Sankar, Kam Tuen Law, Hoi Chun Po, and Berthold Jäck

[Phys. Rev. Research 5, 043269] Published Wed Dec 20, 2023

**Determination of the nearest-neighbor interaction in $\mathrm{V}{\mathrm{O}}_{2}$ via fractal dimension analysis**

Jacob Holder, Daniel Kazenwadel, Peter Nielaba, and Peter Baum

Author(s): Jacob Holder, Daniel Kazenwadel, Peter Nielaba, and Peter Baum

[Phys. Rev. Research 5, 043272] Published Wed Dec 20, 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Extendable piezo/ferroelectricity in nonstoichiometric 2D transition metal dichalcogenides**

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Found 4 papers in comm-phys **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) **Synthesizing 2 h/e^{2} resistance plateau at the first Landau level confined in a quantum point contact**

Yoshiro Hirayama

Communications Physics, Published online: 20 December 2023; doi:10.1038/s42005-023-01491-8

In the quantum Hall regime, electrical current flows along the edges in a chiral fashion and they determine the Hall resistance plateaus. This work reports on experiments on fractional and integer quantum Hall edge channel mixing in a quantum point contact, which lead to unexpectedly anomalous resistance plateaus, shedding light onto the edge reconstruction and equilibration processes. Communications Physics, Published online: 20 December 2023; doi:10.1038/s42005-023-01447-y Transition metal dichalcogenide-based photovoltaics offer the prospect of increased specific power compared to incumbent solar technologies but there are engineering challenges that come with integrating these materials into high-efficiency devices. Here, the authors develop a model to describe the relationship between material quality and the performance limits of single junction solar cells built with various transition metal dichalcogenides. |

Communications Physics, Published online: 20 December 2023; doi:10.1038/s42005-023-01490-9 Quantum-inspired thermal diffusion systems have been realized the thermal localization and design of robust thermal decay by topological methodology as well as wave systems. As a further development, this paper demonstrates that initial temperature distributions for topological edge modes control the diffusion direction in a honeycomb-shaped periodic structure. |

Communications Physics, Published online: 19 December 2023; doi:10.1038/s42005-023-01487-4 Non-Hermitian skin effect, as an important consequence of a non-Hermitian topological system, has recently attracted great attention. This paper reports an anomalous non-Hermitian skin effect, where the correspondence between skin modes and the non-zero winding number defined within point gaps can be broken, enabling further understanding of the non-Bloch band theory in the non-Hermitian field. |