Found 27 papers in cond-mat The Ising antiferromagnets on the triangular and on the pyrochlore lattices
are two of the most iconic examples of magnetic frustration, paradigmatically
illustrating many exotic properties such as emergent gauge fields,
fractionalisation, and topological order. In this work, we show that the two
instances of frustration can, remarkably, be combined in a single system, where
they coexist without inducing conventional long range ordering. We show that
the system undergoes a first order phase transition upon lowering the
temperature, into a yet different frustrated phase that we characterise to
exhibit nematic order. We argue that an extensive degeneracy survives down to
zero temperature, at odds with a customary Pauling estimate. Dynamically, we
find evidence of anomalous noise in the power spectral density, arising from an
effectively anisotropic fractal motion of monopoles at low temperature.
We study theoretically the electron dynamics of transition metal
dichalcogenide quantum dots in the field of an ultrashort and ultrafast
circularly polarized optical pulse. The quantum dots have the shape of a disk
and their electron systems are described within an effective model with
infinite mass boundary conditions. Similar to transition metal dichalcogenide
monolayers, a circularly polarized pulse generates ultrafast valley
polarization of such quantum dots. The dependence of the valley polarization on
the size of the dot is sensitive to the dot material and, for different
materials, show both monotonic increase with the dot radius and nonmonotonic
behavior with a local maximum at a finite dot radius.
Hydrogen-rich materials offer a compelling avenue towards room temperature
superconductivity, albeit under ultra-high pressure. However, the high-pressure
environment imposes formidable constraints to investigate the electronic band
structure. Even under ambient pressure, the research remains elusive, due to
the inherent instability of most of the hydrogen-rich materials upon pressure
release. Very recently, high temperature superconductivity has been reported in
pressurized lutetium hydrides (~71 K) and nitrogen doped lutetium hydride (~294
K), with the later under debate. Upon decompression, nitrogen doped lutetium
hydride manifests a stable metallic phase with dark blue color. This
transformation engenders an unprecedented opportunity, allowing for the
experimental investigation of the electronic band structure intrinsic to
hydrogen-rich material. In this work, using angle resolved photoemission
spectroscopy to investigate the nitrogen doped lutetium hydride, we observed
significant flat band and a Van Hove singularity marginally below the Fermi
level. These salient features, identified as critical elements, proffer
potential amplifiers for the realization of heightened superconductivity,
potentially extending to room temperature, as evidenced by prior research. Our
results not only unveil a confluence of potent strong correlation effects and
anisotropy within the Lu-H-N compound, but also provide a prospect for
engineering high temperature superconductivity through the strategic
manipulation of flat band and the VHS, effectively tailoring their alignment
with the Fermi energy.
This paper presents a theory of interaction-induced band-flattening in
strongly correlated electron systems. We begin by illustrating an inherent
connection between flat bands and index theorems, and presenting a generic
prescription for constructing flat bands by periodically repeating local
Hamiltonians with topological zero modes. Specifically, we demonstrate that a
Dirac particle in an external, spatially periodic magnetic field can be cast in
this form. We derive a condition on the field to produce perfectly flat bands
and provide an exact analytical solution for the flat band wave functions.
Furthermore, we explore an interacting model of Dirac fermions in a spatially
inhomogeneous field. We show that certain Hubbard-Stratonovich configurations
exist that ``rectify'' the field configuration, inducing band flattening. We
present an explicit model where this localization scenario is energetically
favorable -- specifically in Dirac systems with nearly flat bands, where the
energy cost of rectifying textures is quadratic in the order parameter, whereas
the energy gain from flattening is linear. In conclusion, we discuss
alternative symmetry-breaking channels, especially superconductivity, and
propose that these interaction-induced band-flattening scenarios represent a
generic non-perturbative mechanism for spontaneous symmetry breaking, pertinent
to many strongly-correlated electron systems.
In this work, we attack the problem of "chiral phase instability" ($\chi$PI)
in a quantum chromodynamics (QCD) system under a parallel and constant
electromagnetic field. The $\chi$PI refers to that: When $I_2\equiv{\bf E\cdot
B}$ is larger than the threshold $I_2^c$, no homogeneous solution can be found
for $\sigma$ or $\pi^0$ condensate, and the chiral phase (or angle) $\theta$
becomes unstable. Within the two-flavor chiral perturbation theory, we obtain
an effective Lagrangian density for $\theta(x)$ where the chiral anomalous
Wess-Zumino-Witten term is found to play a role of "source" to the "potential
field" $\theta(x)$. The Euler-Lagrangian equation is applied to derive the
equation of motion for $\theta(x)$, and physical solutions are worked out for
several shapes of system. In the case $I_2>I_2^c$, it is found that the
$\chi$PI actually implies an inhomogeneous QCD phase with $\theta(x)$ spatially
dependent. By its very nature, the homogeneous-inhomogeneous phase transition
is of pure topological and second order at $I_2^c$. Finally, the work is
extended to the three-flavor case, where an inhomogeneous $\eta$ condensation
is also found to be developed for $I_2>I_2^c$. Correspondingly, there is a
second critical point, $I_2^{c'}=24.3I_2^c$, across which the transition is
also of topological and second order by its very nature.
Topological insulators and semimetals have been shown to possess intriguing
thermoelectric properties promising for energy harvesting and cooling
applications. However, thermoelectric transport associated with the Fermi arc
topological surface states on topological Dirac semimetals remains less
explored. In this work, we systematically examine thermoelectric transport in a
series of topological Dirac semimetal Cd3As2 thin films grown by molecular beam
epitaxy. Surprisingly, we find significantly enhanced Seebeck effect and
anomalous Nernst effect at cryogenic temperatures when the Cd3As2 layer is
thin. Combining angle-dependent quantum oscillation analysis,
magnetothermoelectric measurement, transport modelling and first-principles
simulation, we isolate the contributions from bulk and surface conducting
channels and attribute the unusual thermoeletric properties to the topological
surface states. Our analysis showcases the rich thermoelectric transport
physics in quantum-confined topological Dirac semimetal thin films and suggests
new routes to achieving high thermoelectric performance at cryogenic
temperatures.
C$_3$N$_4$ is a recently discovered phase of carbon-nitrides with the
tetragonal crystal structure (arXiv:2209.01968) that is stable at ambient
conditions. C$_3$N$_4$ is a semiconductor exhibiting flat-band anomalies in the
valence band, suggesting the emergence of many-body instabilities upon hole
doping. Here, using state-of-the-art first-principles calculations we show that
hole-doped C$_3$N$_4$ reveals strong electron-phonon coupling, leading to the
formation of a gapped superconducting state. The phase transition temperatures
turns out to be strongly dependent on the hole concentration. We propose that
holes could be injected into C$_3$N$_4$ via boron doping which induces,
according to our results, a rigid shift of the Fermi energy without significant
modification of the electronic structure. Based on the electron-phonon coupling
and Coulomb pseudopotential calculated from first principles, we conclude that
the boron concentration of 6 atoms per nm$^3$ would be required to reach the
critical temperature of $\sim$55 K at ambient pressure.
Harnessing electronic excitations involving coherent coupling to bosonic
modes is essential for the design and control of emergent phenomena in quantum
materials [1]. In situations where charge carriers induce a lattice distortion
due to the electron-phonon interaction, the conducting states get "dressed".
This leads to the formation of polaronic quasiparticles that dramatically
impact charge transport, surface reactivity, thermoelectric and optical
properties, as observed in a variety of crystals and interfaces composed of
polar materials [2-6]. Similarly, when oscillations of the charge density
couple to conduction electrons the more elusive plasmon polaron emerges [7],
which has been detected in electron-doped semiconductors [8-10]. However, the
exploration of polaronic effects on low energy excitations is still in its
infancy in two-dimensional (2D) materials. Here, we present the discovery of an
interlayer plasmon polaron in heterostructures composed of graphene on top of
SL WS$_2$. By using micro-focused angle-resolved photoemission spectroscopy
(microARPES) during in situ doping of the top graphene layer, we observe a
strong quasiparticle peak accompanied by several carrier density-dependent
shake-off replicas around the SL WS$_2$ conduction band minimum (CBM). Our
results are explained by an effective many-body model in terms of a coupling
between SL WS$_2$ conduction electrons and graphene plasmon modes. It is
important to take into account the presence of such interlayer collective
modes, as they have profound consequences for the electronic and optical
properties of heterostructures that are routinely explored in many device
architectures involving 2D transition metal dichalcogenides (TMDs) [11-15].
The ferroelectric semiconductor $\alpha$-SnTe has been regarded as a
topological crystalline insulator and the dispersion of its surface states has
been intensively measured with angle-resolved photoemission spectroscopy
(ARPES) over the last decade. However, much less attention has been given to
the impact of the ferroelectric transition on its electronic structure, and in
particular on its bulk states. Here, we investigate the low-energy electronic
structure of $\alpha$-SnTe with ARPES and follow the evolution of the
bulk-state Rashba splitting as a function of temperature, across its
ferroelectric critical temperature of about $T_c\sim 110$ K. Unexpectedly, we
observe a persistent band splitting up to room temperature, which is consistent
with an order-disorder contribution to the phase transition that requires the
presence of fluctuating local dipoles above $T_c$. We conclude that no
topological surface state can occur at the (111) surface of SnTe, at odds with
recent literature.
The recently discovered high-T$_C$ superconductor La$_3$Ni$_2$O$_7$ has
sparked renewed interest in the unconventional superconductivity. Here we study
the unconventional superconductivity in pressurized La$_3$Ni$_2$O$_7$ based on
a bilayer two-orbital $t-J$ model, using the renormalized mean-field theory.
Our results reveal a robust $s^\pm-$wave pairing driven by the inter-layer
$d_{z^2}$ magnetic coupling, which exhibits a transition temperature within the
same order of magnitude as the experimentally observed $T_c \sim 80$ K. We
obtain a comprehensive superconducting phase diagram in the doping plane.
Notably, the La$_3$Ni$_2$O$_7$ under pressure is found situated roughly in the
optimal doping regime of the phase diagram. When the $d_{x^2-y^2}$ orbital
becomes close to half-filling, $d-$wave and $d+is$ pairing can emerge from the
system. We discuss the interplay between the Fermi surface topology and
different pairing symmetries. The stability of the $s^\pm-$wave pairing against
Hund's coupling and other magnetic exchange couplings is examined.
Organic/inorganic interfaces formed by monolayer substrates and conjugated
molecular adsorbates are attractive material platforms leveraging the
modularity of organic compounds together with the long-range phenomena typical
of condensed matter. New quantum states are known to be generated by electronic
interactions in these systems as well as by their coupling with light. However,
little is still known about hybrid vibrational modes. In this work, we discover
from first principles the existence of an infrared-active chiral phonon mode in
a pyrene-decorated MoSe$_{2}$ monolayer given by the combination of a
frustrated rotation of the molecule around its central axis and an optical mode
in the substrate. Our results suggest the possibility to enable phonon
chirality in molecular superlattices.
Highly tunable properties make Mn(Bi,Sb)$_2$Te$_4$ a rich playground for
exploring the interplay between band topology and magnetism: On one end,
MnBi$_2$Te$_4$ is an antiferromagnetic topological insulator, while the
magnetic structure of MnSb$_2$Te$_4$ (MST) can be tuned between
antiferromagnetic and ferrimagnetic. Motivated to control electronic properties
through real-space magnetic textures, we use magnetic force microscopy (MFM) to
image the domains of ferrimagnetic MST. We find that magnetic field tunes
between stripe and bubble domain morphologies, raising the possibility of
topological spin textures. Moreover, we combine in situ transport with domain
manipulation and imaging to both write MST device properties and directly
measure the scaling of the Hall response with domain area. This work
demonstrates measurement of the local anomalous Hall response using MFM, and
opens the door to reconfigurable domain-based devices in the M(B,S)T family.
Ultrafast light-matter interaction has emerged as a powerful tool to control
and probe the macroscopic properties of functional materials, especially
two-dimensional transition metal dichalcogenides which can form different
structural phases with distinct physical properties. However, it is often
difficult to accurately determine the transient optical constants. In this
work, we developed a near-infrared pump - terahertz to midinfrared (12-22 THz)
probe system in transmission geometry to measure the transient optical
conductivity in 2H-MoTe2 layered material. By performing separate measurements
on bulk and thin-film samples, we are able to overcome issues related to
nonuniform substrate thickness and penetration depth mismatch and to extract
the transient optical constants reliably. Our results show that photoexcitation
at 690 nm induces a transient insulator-metal transition, while photoexcitation
at 2 um has a much smaller effect due to the photon energy being smaller than
the band gap of the material. Combining this with a single-color pump-probe
measurement, we show that the transient response evolves towards 1T' phase at
higher flunece. Our work provides a comprehensive understanding of the
photoinduced phase transition in the 2H-MoTe2 system.
We propose a general construction of symmetry protected Lorentz invariant
non-Hermitian (NH) Dirac semimetals (DSMs), realized by invoking masslike
anti-Hermitian Dirac operators to its Hermitian counterpart. They feature
purely real or imaginary isotropic linear band dispersion, yielding a vanishing
density of states. Dynamic mass orderings in NH DSMs thus take place for strong
Hubbardlike local interactions through a quantum phase transition where nodal
NH Dirac quasiparticles are strongly coupled with bosonic order-parameter
fluctuations, hosting a non-Fermi liquid, beyond which the system becomes an
insulator. Depending on the internal Clifford algebra between the NH Dirac
operator and candidate mass order-parameter, the resulting quantum critical
fluid either remains coupled with the environment or recovers full Hermiticity
by decoupling from the bath, while always enjoying an emergent Yukawa-Lorentz
symmetry in terms of a unique velocity. We showcase the competition between
such mass orderings, their hallmarks on quasiparticle spectra in the ordered
phases, and the relevance of our findings in correlated designer NH Dirac
materials.
Nontrivial bulk topological invariants of quantum materials can leave their
signatures on charge, thermal and spin transports. In two dimensions, their
imprints can be experimentally measured from well-developed multi-terminal Hall
bar arrangements. Here, we numerically compute the low temperature ($T$)
thermal ($\kappa_{xy}$) and zero temperature spin ($\sigma^{sp}_{xy}$) Hall
conductivities, and longitudinal thermal conductance ($G^{th}_{xx}$) of various
paradigmatic two-dimensional fully gapped topological superconductors,
belonging to distinct Altland-Zirnbauer symmetry classes, namely $p+ip$ (class
D), $d+id$ (class C) and $p \pm ip$ (class DIII) paired states, in mesoscopic
six-terminal Hall bar setups from the scattering matrix formalism using Kwant.
In both clean and weak disorder limits, the time-reversal symmetry breaking
$p+ip$ and $d+id$ pairings show half-quantized and quantized $\kappa_{xy}$ [in
units of $\kappa_0=\pi^2 k^2_B T/(3h)$], respectively, while the latter one in
addition accommodates a quantized $\sigma^{sp}_{xy}$ [in units of
$\sigma^{sp}_0=\hbar/(8 \pi)$]. By contrast, the time-reversal invariant $p \pm
ip$ pairing only displays a quantized $G^{th}_{xx}$ at low $T$ up to a moderate
strength of disorder. In the strong disorder regime, all these topological
responses ($\kappa_{xy}$, $\sigma^{sp}_{xy}$ and $G^{th}_{xx}$) vanish.
Possible material platforms hosting such paired states and manifesting these
robust topological thermal and spin responses are highlighted.
We assess if a characteristic length for a non-linear interfacial slip
instability follows from theoretical descriptions of sliding friction. We
examine friction laws and their coupling with the elasticity of bodies in
contact and show that such a length does not always exist. We consider a range
of descriptions for frictional strength and show that the area needed to
support a slip instability is negligibly small for laws that are more faithful
to experimental data. This questions whether a minimum earthquake size exists
and shows that the nucleation phase of dynamic rupture contains discriminatory
information on the nature of frictional strength evolution.
We investigate a bilayer honeycomb lattice model of spin-1/2 fermions at
half-filling with local Heisenberg coupling of fermion spins across the two
layers. Using variational Monte Carlo (VMC) simulation, we demonstrate that the
system undergoes a direct transition from a Dirac semimetal phase to a
symmetric gapped phase, known as symmetric mass generation (SMG), as the
Heisenberg coupling strength is increased. The transition does not involve
spontaneous symmetry breaking or topological order and has been proposed as an
example of the fermionic deconfined quantum critical point (fDQCP). Our
simulation shows that a fermionic parton bilinear mass opens at the transition
point while all symmetries are still preserved thanks to the quantum
fluctuations introduced by the correlation factor in the variational wave
function. From the simulation data, we extract the critical exponent
$\nu=0.96\pm0.03$ and the fermion scaling dimension $\Delta_c=1.31\pm0.04$ at
the SMG critical point, which are consistent with the field theoretical
prediction of fDQCP in (2+1)D. These findings support the hypothesis that the
fermion fractionalizes at the SMG critical point.
Quantum systems evolve in time in one of two ways: through the Schr\"odinger
equation or wavefunction collapse. So far, deterministic control of quantum
many-body systems in the lab has focused on the former, due to the
probabilistic nature of measurements. This imposes serious limitations:
preparing long-range entangled states, for example, requires extensive circuit
depth if restricted to unitary dynamics. In this work, we use mid-circuit
measurement and feed-forward to implement deterministic non-unitary dynamics on
Quantinuum's H1 programmable ion-trap quantum computer. Enabled by these
capabilities, we demonstrate for the first time a constant-depth procedure for
creating a toric code ground state in real-time. In addition to reaching high
stabilizer fidelities, we create a non-Abelian defect whose presence is
confirmed by transmuting anyons via braiding. This work clears the way towards
creating complex topological orders in the lab and exploring deterministic
non-unitary dynamics via measurement and feed-forward.
Strong singularities in the electronic density of states amplify correlation
effects and play a key role in determining the ordering instabilities in
various materials. Recently high order van Hove singularities (VHSs) with
diverging power-law scaling have been classified in single-band electron
models. We show that the 110 surface of Bismuth exhibits high order VHS with an
usually high density of states divergence $\sim (E)^{-0.7}$. Detailed mapping
of the surface band structure using scanning tunneling microscopy and
spectroscopy combined with first-principles calculations show that this
singularity occurs in close proximity to Dirac bands located at the center of
the surface Brillouin zone. The enhanced power-law divergence is shown to
originate from the anisotropic flattening of the Dirac band just above the
Dirac node. Such near-coexistence of massless Dirac electrons and ultra-massive
saddle points enables to study the interplay of high order VHS and Dirac
fermions.
Topological states have been widely investigated in different types of
systems and lattices. In the present work, we report on topological edge states
in double-wave (DW) chains, which can be described by a generalized
Aubry-Andr\'e-Harper (AAH) model. For the specific system of a
driven-dissipative exciton polariton system we show that in such potential
chains, different types of edge states can form. For resonant optical
excitation, we further find that the optical nonlinearity leads to a
multistability of different edge states. This includes topologically protected
edge states evolved directly from individual linear eigenstates as well as
additional edge states that originate from nonlinearity-induced localization of
bulk states. Extending the system into two dimensions (2D) by stacking
horizontal DW chains in the vertical direction, we also create 2D multi-wave
lattices. In such 2D lattices multiple Su-Schrieffer-Heeger (SSH) chains appear
along the vertical direction. The combination of DW chains in the horizontal
and SSH chains in the vertical direction then results in the formation of
higher-order topological insulator corner states.
We report the discovery of bulk superconductivity in Sc6MTe2 with seven kinds
of transition-metal elements M. The critical temperatures for M = 3d elements
are higher than those for 4d and 5d elements and increase in the order of M =
Ni, Co, and Fe with the highest Tc of 4.7 K in Sc6FeTe2. First principles
calculations indicate the presence of significant contribution of Fe 3d
orbitals at the Fermi energy, which most likely enhance the Tc of Sc6FeTe2. The
upper critical field for M = Os is considerably enhanced by the strong
spin-orbit coupling. These results show Sc6MTe2 to constitute a unique family
of d-electron superconductors, in which d electrons of 3d and 5d M atoms
strongly influence the superconducting properties.
In recent years, various classes of systems were proposed to realize
topological states of matter. One of them are multiterminal Josephson junctions
where topological Andreev bound states are constructed in the synthetic space
of superconducting phases. Crucially, the topology in these systems results in
a quantized transconductance between two of its terminals comparable to the
quantum Hall effect. In this work, we study a double quantum dot with four
superconducting terminals and show that it has an experimentally accessible
topological regime in which the non-trivial topology can be measured. We also
include Coulomb repulsion between electrons which is usually present in
experiments and show how the topological region can be maximized in parameter
space.
The electrolyte intercalation mechanism facilitates the insertion/extraction
of charge into the electrode material in rechargeable batteries. Aluminum
fluoride (AlF$_{3}$) has been used as an electrolyte in rechargeable aluminum
batteries with graphite electrodes, demonstrating improved reversibility of
battery charging and discharging processes; however, the intercalation
mechanism of this neutral molecule in graphite is so far unknown. In this work,
we combine scanning tunneling microscopy (STM) in ultra-high vacuum conditions,
calculations based on density functional theory, and large-scale molecular
dynamics simulations to reveal the mechanism of AlF$_{3}$ intercalation in
highly oriented pyrolytic graphite (HOPG). We report the formation of AlF$_{3}$
molecules clusters between graphite layers, their self-assembly by graphene
buckling-mediated interactions, and explain the origin and distribution of
superficial {\it blisters} in the material. Our findings have implications for
understanding the relationship between the mobility and clustering of molecules
and the expansion of the anode material. This, in turn, paves the way for
future enhancements in the performance of energy storage systems.
With their non-Abelian topological charges, real multi-bandgap systems
challenge the conventional topological phase classifications. As the minimal
sector of multi-bandgap systems, real triple degeneracies (RTPs), which serve
as real 'Weyl points', lay the foundation for the research on real topological
phases. However, experimental demonstration of physical systems with global
band configurations consisting of multiple RTPs in crystals has not been
reported. Here we present experimental evidence of RTPs in photonic
meta-crystals, characterizing them using the Euler number, and establishing
their connection with both Abelian and non-Abelian charges. By considering RTPs
as the basic elements, we further propose the concept of a topological
compound, akin to a chemical compound, where we find that certain phases are
not topologically allowed. The topological classification of RTPs in crystals
demonstrated in our work plays a similar role as the 'no-go' theorem in Weyl
systems.
We explore the relationship among the magnetic ordering in real space, the
resulting spin texture on the Fermi surface, and the related superconducting
gap structure in non-collinear antiferromagnetic metals without spin-orbit
coupling. Via a perturbative approach, we show that a non-collinear magnetic
ordering in a metal can generate a momentum-dependent spin texture on its Fermi
surface, even in the absence of spin-orbit coupling, if the metal has more than
three sublattices in its magnetic unit cell. Thus, our theory naturally extends
the idea of altermagnetism to non-collinear spin structures. When
superconductivity is developed in a magnetic metal, as the gap-opening
condition is strongly constrained by the spin texture, the nodal structure of
the superconducting state is also enforced by the magnetism-induced spin
texture. Taking the non-collinear antiferromagnet on the kagome lattice as a
representative example, we demonstrate how the Fermi surface spin texture
induced by noncollinear antiferromagnetism naturally leads to odd-parity
spin-triplet superconductivity with nontrivial topological properties.
The pursuit of room-temperature ambient-pressure superconductivity in novel
materials has sparked interest, with recent reports suggesting such properties
in Cu-substituted lead apatite, known as LK-99. However, these claims lack
comprehensive experimental and theoretical support. In this study, we address
this gap by conducting ab initio calculations to explore the impact of varying
doping concentrations (x = 0, 1, 2) on the stability and electronic properties
of five compounds in the LK-99 family. Our investigations confirm the isolated
flat bands that intersect the Fermi level in LK-99 (Pb9Cu(PO4)6O:Cu<Pb(1)>). In
contrast, the other four parent compounds exhibit insulating behavior with wide
band gaps. X-ray diffraction spectra based on the DFT simulations at 0K confirm
the presence of Cu substitution on Pb(1) sites in the originally synthesized
LK-99 sample, while an extra peak suggests potential alternative like
Pb8Cu2(PO4)6 phases due to compositional variations in the original LK-99
samples. Furthermore, the LK-99 structure undergoes substantial lattice
constriction, resulting in a significant 5.5% reduction in volume and 6.8% in
area of two mutually inverted triangles formed by Pb(2) atoms. Meanwhile,
energy calculations reveal a marginal energy preference for substituting Cu on
Pb(2) sites over Pb(1) sites, with a difference of approximately 0.010 eV per
atom (roughly 0.9645 k/mol). Intriguingly, at pressures exceeding 73 GPa,
stability shifts towards LK-99 containing Cu substitutions on Pb(1) sites.
Despite exhibiting higher electronic conductivity than parent compounds,
Pb9Cu(PO4)6O:Cu<Pb(1)> falls short of the conductivity levels observed in
metals or advanced oxide conductors with the simulation based on the Boltzmann
transport theory.
The structure of the excess proton in liquid water has been the subject of
lively debate from both experimental and theoretical fronts for the last
century. Fluctuations of the proton are typically interpreted in terms of
limiting states referred to as the Eigen and Zundel species. Here we put these
ideas under the microscope taking advantage of recent advances in unsupervised
learning that use local atomic descriptors to characterize environments of
acidic water combined with advanced clustering techniques. Our agnostic
approach leads to the observation of only a single charged cluster and two
neutral ones. We demonstrate that the charged cluster involving the excess
proton, is best seen as an ionic topological defect in water's hydrogen bond
network forming a single local minimum on the global free-energy landscape.
This charged defect is a highly fluxional moiety where the idealized Eigen and
Zundel species are neither limiting configurations nor distinct thermodynamic
states. Instead, the ionic defect enhances the presence of neutral water
defects through strong interactions with the network. We dub the combination of
the charged and neutral defect clusters as ZundEig demonstrating that the
fluctuations between these local environments provide a general framework for
rationalizing more descriptive notions of the proton in the existing
literature.

Date of feed: Fri, 01 Sep 2023 00:30:00 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Thermodynamics and fractal dynamics of nematic spin ice, a doubly frustrated pyrochlore Ising magnet. (arXiv:2308.16234v1 [cond-mat.str-el])**

Jonathan N. Hallén, Claudio Castelnovo, Roderich Moessner

**Ultrafast Field-driven Valley Polarization of Transition Metal Dichalcogenide Quantum Dots. (arXiv:2308.16315v1 [cond-mat.mes-hall])**

Aranyo Mitra, Ahmal Jawad Zafar, Vadym Apalkov

**Observation of Flat band and Van Hove Singularity in Nitrogen Doped Lutetium Hydride. (arXiv:2308.16420v1 [cond-mat.supr-con])**

Xin Liang, Zihan Lin, Jun Zhang, Jianfa Zhao, Shiyu Feng, Wenlong Lu, Guodong Wang, Luchuan Shi, Ningning Wang, Pengfei Shan, Muntaser Naamneh, Runzhe Liu, Bastien Michon, Jinguang Cheng, Changqing Jin, Yang Ren, Junzhang Ma

**Localizing Transitions via Interaction-Induced Flat Bands. (arXiv:2308.16440v1 [cond-mat.str-el])**

Alireza Parhizkar, Victor Galitski

**Topological transition in a parallel electromagnetic field. (arXiv:2308.16448v1 [nucl-th])**

Gaoqing Cao

**Extraordinary Thermoelectric Properties of Topological Surface States in Quantum-Confined Cd3As2 Thin Films. (arXiv:2308.16487v1 [cond-mat.mtrl-sci])**

Wenkai Ouyang, Alexander C. Lygo, Yubi Chen, Huiyuan Zheng, Dung Vu, Brandi L. Wooten, Xichen Liang, Wang Yao, Joseph P. Heremans, Susanne Stemmer, Bolin Liao

**Strong electron-phonon coupling and phonon-induced superconductivity in tetragonal C$_3$N$_4$ with hole doping. (arXiv:2308.16507v1 [cond-mat.supr-con])**

Alexander N. Rudenko, Danis I. Badrtdinov, Igor A. Abrikosov, Mikhail I. Katsnelson

**Discovery of interlayer plasmon polaron in graphene/WS$_2$ heterostructures. (arXiv:2308.16509v1 [cond-mat.mes-hall])**

Søren Ulstrup, Yann in 't Veld, Jill A. Miwa, Alfred J. H. Jones, Kathleen M. McCreary, Jeremy T. Robinson, Berend T. Jonker, Simranjeet Singh, Roland J. Koch, Eli Rotenberg, Aaron Bostwick, Chris Jozwiak, Malte Rösner, Jyoti Katoch

**Persistence of structural distortion and bulk band Rashba splitting in SnTe above its ferroelectric critical temperature. (arXiv:2308.16558v1 [cond-mat.mtrl-sci])**

Frédéric Chassot (1), Aki Pulkkinen (1,2), Geoffroy Kremer (1,3), Tetiana Zakusylo (4), Gauthier Krizman (4), Mahdi Hajlaoui (4), J. Hugo Dil (5,6), Juraj Krempaský (6), Ján Minár (2), Gunther Springholz (4), Claude Monney (1) ((1) Department of Physics and Fribourg Center for Nanomaterials, Université de Fribourg, Fribourg, Switzerland, (2) New Technologies-Research Center, University of West Bohemia, Plzen, Czech Republic, (3) Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, Campus ARTEM, 2 allée André Guinier, BP 50840, 54011 Nancy, France, (4) Institut für Halbleiter-und Festkörperphysik, Johannes Kepler Universität, Linz, Austria, (5) Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, (6) Photon Science Division, Paul Scherrer Institut, Villigen, Switzerland)

**High-T$_C$ superconductivity in $\mathrm{La_3Ni_2O_7}$ based on the bilayer two-orbital t-J model. (arXiv:2308.16564v1 [cond-mat.supr-con])**

Zhihui Luo, Biao Lv, Meng Wang, Wéi Wú, Dao-xin Yao

**Interlayer vibrational hybrid normal mode enabling molecular chiral phonons. (arXiv:2308.16779v1 [cond-mat.mtrl-sci])**

Hanen Hamdi, Jannis Krumland, Ana M. Valencia, Carlos-Andres Palma, Caterina Cocchi

**Tunable magnetic domains in ferrimagnetic MnSb$_2$Te$_4$. (arXiv:2308.16806v1 [cond-mat.str-el])**

Tatiana A. Webb, Afrin N. Tamanna, Xiaxin Ding, Jikai Xu, Lia Krusin-Elbaum, Cory R. Dean, Dmitri N. Basov, Abhay N. Pasupathy

**Direct measurement of photoinduced transient conducting state in multilayer 2H-MoTe2. (arXiv:2308.16840v1 [cond-mat.mes-hall])**

XinYu Zhou, H Wang, Q M Liu, S J Zhang, S X Xu, Q Wu, R S Li, L Yue, T C Hu, J Y Yuan, S S Han, T Dong, D Wu, N L Wang

**Yukawa-Lorentz Symmetry in Non-Hermitian Dirac Materials. (arXiv:2308.16907v1 [cond-mat.str-el])**

Vladimir Juricic, Bitan Roy

**Quantized thermal and spin transports of dirty planar topological superconductors. (arXiv:2308.16908v1 [cond-mat.mes-hall])**

Sanjib Kumar Das, Bitan Roy

**Frictional state evolution laws and the non-linear nucleation of dynamic shear rupture. (arXiv:2008.11854v3 [cond-mat.soft] UPDATED)**

Robert C. Viesca

**Variational Monte Carlo Study of Symmetric Mass Generation in a Bilayer Honeycomb Lattice Model. (arXiv:2212.13364v2 [cond-mat.str-el] UPDATED)**

Wanda Hou, Yi-Zhuang You

**Topological Order from Measurements and Feed-Forward on a Trapped Ion Quantum Computer. (arXiv:2302.01917v3 [quant-ph] UPDATED)**

Mohsin Iqbal, Nathanan Tantivasadakarn, Thomas M. Gatterman, Justin A. Gerber, Kevin Gilmore, Dan Gresh, Aaron Hankin, Nathan Hewitt, Chandler V. Horst, Mitchell Matheny, Tanner Mengle, Brian Neyenhuis, Ashvin Vishwanath, Michael Foss-Feig, Ruben Verresen, Henrik Dreyer

**Visualizing near-coexistence of massless Dirac electrons and ultra-massive saddle point electrons. (arXiv:2303.02250v2 [cond-mat.mes-hall] UPDATED)**

Abhay Kumar Nayak, Jonathan Reiner, Hengxin Tan, Huixia Fu, Henry Ling, Chandra Shekhar, Claudia Felser, Tami Pereg-Barnea, Binghai Yan, Haim Beidenkopf, Nurit Avraham

**Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates. (arXiv:2303.12593v2 [cond-mat.quant-gas] UPDATED)**

Tobias Schneider, Wenlong Gao, Thomas Zentgraf, Stefan Schumacher, Xuekai Ma

**Superconductivity in Ternary Scandium Telluride Sc6MTe2 with 3d, 4d, and 5d Transition Metals. (arXiv:2304.01444v2 [cond-mat.supr-con] UPDATED)**

Yusaku Shinoda, Yoshihiko Okamoto, Youichi Yamakawa, Haruka Matsumoto, Daigorou Hirai, Koshi Takenaka

**Ground state topology of a four-terminal superconducting double quantum dot. (arXiv:2304.11982v2 [cond-mat.mes-hall] UPDATED)**

Lev Teshler, Hannes Weisbrich, Jonathan Sturm, Raffael L. Klees, Gianluca Rastelli, Wolfgang Belzig

**Study of In-plane and Interlayer Interactions During Aluminum Fluoride Intercalation in Graphite: Implications for the Development of Rechargeable Batteries. (arXiv:2306.10385v2 [cond-mat.mtrl-sci] UPDATED)**

Sindy J. Rodríguez, Adriana E. Candia, Igor Stancović, Mario C.G. Passeggi (Jr.), Gustavo D. Ruano

**Unveiling Real Triple Degeneracies in Crystals: Exploring Link and Compound Structures. (arXiv:2307.01228v2 [cond-mat.mes-hall] UPDATED)**

Wenwen Liu, Hanyu Wang, Biao Yang, Shuang Zhang

**Fermi Surface Spin Texture and Topological Superconductivity in Spin-Orbit Free Non-Collinear Antiferromagnets. (arXiv:2308.09925v2 [cond-mat.supr-con] UPDATED)**

Seung Hun Lee, Bohm-Jung Yang

**Ab initio Investigations on the Electronic Properties and Stability of Cu-Substituted Lead Apatite (LK-99) family with different doping concentrations (x=0, 1, 2). (arXiv:2308.13938v2 [cond-mat.mtrl-sci] UPDATED)**

Songge Yang, Guangchen Liu, Yu Zhong

**ZundEig: The Structure of the Proton in Liquid Water From Unsupervised Learning. (arXiv:2308.15319v2 [cond-mat.mtrl-sci] UPDATED)**

Solana Di Pino, Edward Danquah Donkor, Verónica M. Sánchez, Alex Rodriguez, Giuseppe Cassone, Damian Scherlis, Ali Hassanali

Found 6 papers in prb Strain-induced transitions of polarization reversal in thin films of a ferrielectric $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ (CIPS) with ideally conductive electrodes are explored using the Landau-Ginzburg-Devonshire approach with an eighth-order free energy expansion in polarization powers.…

Date of feed: Fri, 01 Sep 2023 03:17:06 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Anomalous polarization reversal in strained thin films of $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$**

Anna N. Morozovska, Eugene A. Eliseev, Ayana Ghosh, Mykola E. Yelisieiev, Yulian M. Vysochanskii, and Sergei V. Kalinin

Author(s): Anna N. Morozovska, Eugene A. Eliseev, Ayana Ghosh, Mykola E. Yelisieiev, Yulian M. Vysochanskii, and Sergei V. Kalinin

[Phys. Rev. B 108, 054107] Published Thu Aug 31, 2023

**Erratum: Optical control of topological memory based on orbital magnetization [Phys. Rev. B 105, 064423 (2022)]**

Sergey S. Pershoguba and Victor M. Yakovenko

Author(s): Sergey S. Pershoguba and Victor M. Yakovenko

[Phys. Rev. B 108, 059904] Published Thu Aug 31, 2023

When pressurized, the heavy fermion compound ${\mathrm{CeNiC}}_{2}$ reveals a rich electronic phase diagram and shows unconventional superconductivity with a transition temperature ${T}_{c}∼3.7$ K, the highest among Ce-based heavy fermion superconductors [Katano [Phys. Rev. B 108, 064435] Published Thu Aug 31, 2023 |

Magnetotransport measurements of the centrosymmetric square net ${{\mathrm{Eu}(\mathrm{Ga}}_{1−x}{\mathrm{Al}}_{x})}_{4}$ compounds reveal evidence of both reciprocal- and real-space topology. For compositions $0.50≤x≤0.90$, several intermediate field phases are found by magnetization measurements w… [Phys. Rev. B 108, 064436] Published Thu Aug 31, 2023 |

One of the intrinsic drift velocity limits of the quantum Hall effect is the collective magnetoexciton (ME) instability. It has been demonstrated in bilayer graphene (BLG) using noise measurements [W. Yang [Phys. Rev. B 108, 085438] Published Thu Aug 31, 2023 |

The concept of topology has been widely applied to condensed matter, going beyond the band crossover in reciprocal spaces. A recent breakthrough suggested unconventional topological physics in a quadruple perovskite ${\mathrm{TbMn}}_{3}{\mathrm{Cr}}_{4}{\mathrm{O}}_{12}$, whose magnetism-induced pol… [Phys. Rev. B 108, L060407] Published Thu Aug 31, 2023 |

Found 3 papers in prl A theoretical analysis suggests that certain rotating black holes might be sensitive probes of quantum gravity. Moiré systems have emerged in recent years as a rich platform to study strong correlations. Here, we will propose a simple, experimentally feasible setup based on periodically strained graphene that reproduces several key aspects of twisted moiré heterostructures—but without introducing a twist. We … Growing a flat lamina such as a leaf is almost impossible without some feedback to stabilize long wavelength modes that are easy to trigger since they are energetically cheap. Here we combine the physics of thin elastic plates with feedback control theory to explore how a leaf can remain flat while …

Date of feed: Fri, 01 Sep 2023 03:17:04 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) **Extremal Kerr Black Holes as Amplifiers of New Physics**

Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen, and Jorge E. Santos

Author(s): Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen, and Jorge E. Santos

[Phys. Rev. Lett. 131, 091402] Published Thu Aug 31, 2023

**Untwisting Moiré Physics: Almost Ideal Bands and Fractional Chern Insulators in Periodically Strained Monolayer Graphene**

Qiang Gao, Junkai Dong, Patrick Ledwith, Daniel Parker, and Eslam Khalaf

Author(s): Qiang Gao, Junkai Dong, Patrick Ledwith, Daniel Parker, and Eslam Khalaf

[Phys. Rev. Lett. 131, 096401] Published Thu Aug 31, 2023

**How to Grow a Flat Leaf**

Salem al-Mosleh and L. Mahadevan

Author(s): Salem al-Mosleh and L. Mahadevan

[Phys. Rev. Lett. 131, 098401] Published Thu Aug 31, 2023

Found 1 papers in pr_res Unextendible product bases (UPBs) play a key role in the study of quantum entanglement and nonlocality. Here we provide an equivalent characterization of UPBs in graph-theoretic terms. Different from previous graph-theoretic investigations of UPBs, which focused mostly on the orthogonality relations…

Date of feed: Fri, 01 Sep 2023 03:17:06 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **Graph-theoretic characterization of unextendible product bases**

Fei Shi, Ge Bai, Xiande Zhang, Qi Zhao, and Giulio Chiribella

Author(s): Fei Shi, Ge Bai, Xiande Zhang, Qi Zhao, and Giulio Chiribella

[Phys. Rev. Research 5, 033144] Published Thu Aug 31, 2023

Found 1 papers in nano-lett

Date of feed: Thu, 31 Aug 2023 13:10:12 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99) **[ASAP] One-Step Passivation of Both Sulfur Vacancies and SiO2 Interface Traps of MoS2 Device**

Byungwook Ahn, Yoonsok Kim, Meeree Kim, Hyang Mi Yu, Jaehun Ahn, Eunji Sim, Hyunjin Ji, Hamza Zad Gul, Keun Soo Kim, Kyuwook Ihm, Hyoyoung Lee, Eun Kyu Kim, and Seong Chu LimNano LettersDOI: 10.1021/acs.nanolett.3c01753

Found 1 papers in sci-rep Scientific Reports, Published online: 31 August 2023; doi:10.1038/s41598-023-41563-x**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) **Author Correction: Congenital toxoplasmosis among hospitalized infants in Poland in the years 2007–2021: study based on the national hospital registry**

Aneta Nitsch‑Osuch

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) **Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states**

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