Found 25 papers in cond-mat The study of cavity magnonics and topological insulators has made significant
advances over the past decade, however the possibility of combining the two
fields is still unexplored. Here, we explore such connection by investigating
hybrid cavity systems that incorporate both a ferromagnet and a topological
insulator. We find that electrons in the topological surface state efficiently
mediate the effective electric dipole coupling between the spin of the
ferromagnet and the electric field of the cavity, in contrast with the
conventional cavity magnonics theory based on magnetic dipole coupling. We
refer to this coupling as topological magnon-photon interaction, estimating it
one order of magnitude stronger than the conventional magnon-photon coupling,
and showing that its sign can be manipulated. We discuss the potential of our
proposed device to allow for scaling down and controlling the cavity system
using electronics. Our results provide solid ground for exploring the
functionalities enabled by merging cavity magnonics with topological
insulators.
The interplay between disorder and quantum interference leads to a wide
variety of physical phenomena including celebrated Anderson localization -- the
complete absence of diffusive transport due to quantum interference between
different particle trajectories. In two dimensions, any amount of disorder is
thought to induce localization of all states at long enough length scales,
though this may be prevented if bands are topological or have strong spin-orbit
coupling. In this note, we present a simple argument providing another
mechanism for disrupting localization: by tuning the underlying curvature of
the manifold on which diffusion takes place. We show that negative curvature
manifolds contain a natural infrared cut off for the probability of self
returning paths. We provide explicit calculations of the Cooperon -- directly
related to the weak-localization corrections to the conductivity -- in
hyperbolic space. It is shown that constant negative curvature leads to a rapid
growth in the number of available trajectories a particle can coherently
traverse in a given time, reducing the importance of interference effects and
restoring classical diffusive behavior even in the absence of inelastic
collisions. We conclude by arguing that this result may be amenable to
experimental verification through the use of quantum simulators.
Magnetic skyrmions are topologically protected spin textures with potential
applications in memory and logic devices. Skyrmions have been commonly observed
in systems with Dzyaloshinskii-Moriya interaction due to broken inversion
symmetry. Yet, recent studies suggest that skyrmions can also be stabilized in
systems with inversion symmetry such as Ni-based dihalides due to magnetic
frustration. In this article, we employ atomistic simulations to investigate
chiral magnetic phases in bilayers of NiI$_2$ and NiBr$_2$. We show that the
antiferromagnetic interlayer coupling introduces an additional magnetic
frustration and gives rise to a variety of novel spin textures with different
topological charges. Specifically for NiI$_2$, we observe that the skyrmions
with the in-plane component of spins wrapping around twice (biskyrmions) have
an enhanced stability compared to the monolayer case. We also study the
polarization induced by the non-colinear magnetic order in NiI$_2$ bilayers and
show that the polarization of the topologically nontrivial phases is negligible
compared to the spiral phases. Thus, we conclude that polarization measurements
can be an indirect route for detecting skyrmions in upcoming experiments.
In a $p$-wave Kitaev model, the nearest neighbor pairing term results in the
formation of the Bardeen-Cooper-Schrieffer (BCS) pair in the ground state. In
this work, we study the fermionic condensation of real-space pairs in a $% p
$-wave Kitaev model on a square lattice with a uniform phase gradient pairing
term along both directions. The exact solution shows that the ground state can
be expressed in a coherent-state-like form, indicating the condensation of a
collective pairing mode, which is the superposition of different configurations
of pairs in real space. The amplitudes of each configuration depend not only on
the size but also on the orientation of the pair. We employ three quantities to
characterize the ground state in the thermodynamic limit. (i) A BCS-pair order
parameter is introduced to characterize the phase diagram, consisting of gapful
and topological gapless phases. (ii) The particle-particle correlation length
is obtained to reveal the polarity of the pair condensation. In addition, (iii)
a pair-pair correlator is analytically derived to indicate the possessing of
off-diagonal long-range order. Our work proposes an alternative method for
understanding fermionic condensation.
Recently, Sukbae Lee et al. reported inspiring experimental findings on the
atmospheric superconductivity of a modified lead apatite crystal (LK-99) at
room temperature (10.6111/JKCGCT.2023.33.2.061, arXiv: 2307.12008, arXiv:
2307.12037). They claimed that the synthesized LK-99 materials exhibit the
Meissner levitation phenomenon of superconductors and have a superconducting
transition temperature (Tc) higher than 400 K. Here, for the first time, we
successfully verify and synthesize the LK-99 crystals which can be magnetically
levitated with larger levitated angle than Sukbae Lee's sample at room
temperature. It is expected to realize the true potential of room temperature,
non-contact superconducting magnetic levitation in near future.
Topological Weyl semimetals represent a novel class of non-trivial materials,
where band crossings with linear dispersions take place at generic momenta
across reciprocal space. These crossings give rise to low-energy properties
akin to those of Weyl fermions, and are responsible for several exotic
phenomena. Up to this day, only a handful of Weyl semimetals have been
discovered, and the search for new ones remains a very active area. The main
challenge on the computational side arises from the fact that many of the tools
used to identify the topological class of a material do not provide a complete
picture in the case of Weyl semimetals. In this work, we propose an alternative
and inexpensive, criterion to screen for possible Weyl fermions, based on the
analysis of the band structure along high-symmetry directions in the absence of
spin-orbit coupling. We test the method by running a high-throughput screening
on a set of 5455 inorganic bulk materials and identify 49 possible candidates
for topological properties. A further analysis, carried out by identifying and
characterizing the crossings in the Brillouin zone, shows us that 3 of these
candidates are Weyl semimetals. Interestingly, while these 3 materials
underwent other high-throughput screenings, none had revealed their topological
behavior before.
Despite extensive existing studies, a complete understanding of the role of
disorder in affecting the physical properties of two-dimensional Dirac
fermionic systems remains a standing challenge, largely due to obstacles
encountered in treating multiple scattering events for such inherently strong
scattering systems. Using graphene as an example and a nonperturbative
numerical technique, here we reveal that the low energy quasiparticle
properties are considerably modified by multiple scattering processes even in
the presence of weak scalar potentials. We extract unified power-law energy
dependences of the self-energy with fractional exponents from the weak
scattering limit to the strong scattering limit from our numerical analysis,
leading to sharp reductions of the quasiparticle residues near the Dirac point,
eventually vanishing at the Dirac point. The central findings stay valid when
the Anderson-type impurities are replaced by correlated Gaussian- or
Yukawa-type disorder with varying correlation lengths. The improved
understanding gained here also enables us to provide better interpretations of
the experimental observations surrounding the temperature and carrier density
dependences of the conductivity in ultra-high mobility graphene samples. The
approach demonstrated here is expected to find broad applicability in
understanding the role of various other types of impurities in two-dimensional
Dirac systems.
We propose a theoretical framework to investigate elementary excitations at
finite temperatures within a localized electron model that describes the
interactions between multiple degrees of freedom, such as quantum spin models
and Kugel-Khomskii models. Thus far, their excitation structures have been
mainly examined using the linear flavor-wave theory, an SU($N$) generalization
of the linear spin-wave theory. These techniques introduce noninteracting
bosonic quasiparticles as elementary excitations from the ground state, thereby
elucidating numerous physical phenomena, including excitation spectra and
transport properties characterized by topologically nontrivial band structures.
Nevertheless, the interactions between quasiparticles cannot be ignored in
systems exemplified by $S=1/2$ quantum spin models, where strong quantum
fluctuations are present. Recent studies have investigated the effects of
quasiparticle damping at zero temperature in such models. In our study,
extending this approach to the flavor-wave theory for general localized
electron models, we construct a comprehensive method to calculate excitation
spectra with the quasiparticle damping at finite temperatures. We apply our
method to the Kitaev model under magnetic fields, a typical example of models
with topologically nontrivial magnon bands. Our calculations reveal that chiral
edge modes undergo significant damping in weak magnetic fields, amplifying the
damping rate by the temperature increase. This effect is caused by collisions
with thermally excited quasiparticles. Since our approach starts from a general
Hamiltonian, it will be widely applicable to other localized systems, such as
spin-orbital coupled systems derived from multi-orbital Hubbard models in the
strong correlation limit.
The magnetic field, temperature dependence and the Hall effect have been
measured in order to determine the energy spectrum of the valence band in HgTe
quantum wells with the width (20-200)nm. The comparison of hole densities
determined from the period Shubnikov-de Haas oscillations and the Hall effect
shows that states at the top of valence band are double degenerate in teh entry
quantum wells width the width range. The cyclotron mass determined from
temperature dependence of SdH oscillations increases monotonically from
(0.2-0.3) mass of the free electron, with increasing hole density from 2e11 to
6e11 cm^-2. The determined dependence has been compared to theoretical one
calculate within the four band kp model. The experimental dependence was found
to be strongly inconsistent with this predictions. It has been shown that the
inclusion of additional factors (electric field, strain) does not remove the
contradiction between experiment and theory. Consequently it is doubtful that
the mentioned kp calculations adequately describe the valence band for any
width of quantum well.
While ostensibly coined in 1989 by Xiao-Gang Wen, the term "topological
order" has been in use since 1972 by Kosterlitz-Thouless to describe the
behavior of the classical xy model. It has been noted that the xy model does
not have Wen's topological order since it is also subject a non-topological
U(1) gauge action. We show in a sense this is the only obstruction. That is, if
the xy model evolves quantumly into gauge invariant states then one recovers
pure topological order. In fact, we show the quantum xy topological order is an
infinite lattice limit of Kitaev's quantum double model applied to the group
G=Z.
The Berry curvature provides a powerful tool to unify several branches of
science through their geometrical aspect: topology, energy bands, spin and
vector fields. While quantum defects -- phase vortices and skyrmions -- have
been in the spotlight, as rotational entities in condensates, superfluids and
optics, their dynamics in multi-component fields remain little explored. Here
we use two-component microcavity polaritons to imprint a dynamical pseudospin
texture in the form of a double full Bloch beam, a conformal continuous vortex
beyond unitary skyrmions. The Berry curvature plays a key role to link various
quantum spaces available to describe such textures. It explains for instance
the ultrafast spiraling in real space of two singular vortex cores, providing
in particular a simple expression -- also involving the complex Rabi frequency
-- for their intricate velocity. Such Berry connections open new perspectives
for understanding and controlling highly-structured quantum objects, including
strongly asymmetric cases or even higher multi-component fields.
Spectroscopy experiments are routinely used to characterize the behavior of
strongly correlated systems. An in-depth understanding of the different
spectral features is thus essential. Here, we show that the spectrum of the
multiorbital Hubbard model exhibits unique Hund \ms{bands} that occur at
energies given only by the Hund coupling $J_\mathrm{H}$, as distinct from the
Hubbard satellites following the interaction $U$. We focus on experimentally
relevant single-particle and optical spectra that we calculate for a model
related to iron chalcogenide ladders. The calculations are performed via the
density-matrix renormalization group and Lanczos methods. The generality of the
implications is verified by considering a generic multiorbital model within
dynamical mean-field theory.
In the two-component Ginzburg-Landau theory of superfluidity, a pair of
fractional vortices form a composite type of topological defect, usually
referred to as a baby skyrmion. In this paper, we initiate the construction of
such a baby skyrmion in the holographic model of two-component superfluids. As
a result, two types of baby skyrmion configurations are found, where the
monopole-type of one is constructed directly by solving the static equations of
motion while the dipole-type of one is obtained by resorting to the time
evolution method. In addition, we find that the existence of these two types of
baby skyrmion depends on the inter-component coupling, reminiscent of the
situation in the baby skyrmion model.
The quantum spin hall (QSH) phase, also known as the 2D topological
insulator, is characterized by protected helical edge modes arising from time
reversal symmetry. While initially proposed for band insulators, this phase can
also manifest in strongly-correlated systems where conventional band theory
fails. To overcome the challenge of simulating this phase in realistic
correlated models, we propose a novel framework utilizing fermionic tensor
network states. Our approach involves constructing a tensor representation of
the fixed-point wavefunction based on an exact solvable model, enabling us to
derive a set of tensor equations governing the transformation rules of local
tensors under symmetry operations. These tensor equations lead to the anomalous
edge theory, which provides a comprehensive description of the QSH phase. By
solving these tensor equations, we obtain variational ansatz for the QSH phase,
which we subsequently verify through numerical calculations. This method serves
as an initial step towards employing tensor algorithms to simulate the QSH
phase in strongly-correlated systems, opening new avenues for investigating and
understanding topological phenomena in complex materials.
We theoretically examine a continuity between atomic and molecular Fermi
superfluids in a Bose-Fermi mixture near the Feshbach resonance. Considering a
two-channel model describing the Feshbach resonance between Fermi and Bose
atoms, we have constructed the mean-field framework based on the perturbative
expansion of the Feshbach atom-dimer coupling. The resulting effective
Hamiltonian exhibits not only the continuity between atom-atom to
molecule-molecule Cooper pairings but also becomes equivalent to the
two-band-superconductor model with Suhl-Matthias-Walker type pair-exchange
coupling. We demonstrate how these atomic and molecular Fermi superfluids
coexist within the two-band-like superfluid theory. The pair-exchange coupling
and resulting superfluid gaps are found to be strongly enhanced near the
Feshbach resonance due to the interplay between the infrared singularity of
Bogoliubov phonons and their Landau damping arising from the coupling with
fermions. The pair-exchange coupling can be probed via the observation of the
intrinsic Josephson effect between atomic and molecular superfluids.
Short-range repulsion governs the dynamic behavior of matter across length
scales, from atoms to animals. As the density increases, the dynamics
transition from nearest-neighbor to many-body interactions, posing a challenge
for an analytical description. Here we use theory, simulations, and experiments
to show that a suspension of particles with short-range repulsion spreads
compactly. Unlike the diffusive boundary of a spreading drop of Brownian
particles, a compact expansion is characterized by a density profile that is
strictly zero beyond a cutoff distance. Starting from the microscopic
interactions, we derive an effective, non-linear diffusion equation and find
that the dynamics exhibit two distinct transitions: (1) when very dense,
particle-particle interactions extend beyond nearest neighbors, and the
ensemble grows in a self-similar fashion as time to the power of 1/4. (2) at
lower densities, nearest-neighbor interactions dominate, and the expansion
slows to logarithmic growth. We examine the second regime experimentally by
monitoring the expansion of a dense suspension of charge-stabilized colloids.
Using simulations of thousands of particles, we observe the continuous
crossover between the self-similar and the logarithmic dynamics. Our results
are general and robust, with practical implications in engineering and
pharmaceutical industries, where suspensions must operate at extreme densities.
We investigate the evolution of quantum information under Pauli measurement
circuits. We focus on the case of one- and two-dimensional systems, which are
relevant to the recently introduced Floquet topological codes. We define local
reversibility in context of measurement circuits, which allows us to treat
finite depth measurement circuits on a similar footing to finite depth unitary
circuits. In contrast to the unitary case, a finite depth locally reversible
measurement circuit can implement a translation in one dimension. A locally
reversible measurement circuit in two dimensions may also induce a flow of
logical information along the boundary. We introduce "measurement quantum
cellular automata" which unifies these ideas and define an index in one
dimension to characterize the flow of logical operators. We find a
$\mathbb{Z}_2$ bulk invariant for two-dimensional Floquet topological codes
which indicates an obstruction to having a trivial boundary. We prove that the
Hastings-Haah honeycomb code belongs to a class with such obstruction, which
means that any boundary must have either nonlocal dynamics, period doubled, or
admits anomalous boundary flow of quantum information.
MnBi$_2$Te$_4$, the first confirmed intrinsic antiferromagnetic topological
insulator, has garnered increasing attention in recent years. Here we
investigate the energy correction and lifetime of magnons in MnBi$_2$Te$_4$
caused by magnon-magnon interaction. Firstly, a calculation based on the
density functional theory (DFT) was performed to get the parameters of the
magnetic Hamiltonian of MnBi$_2$Te$_4$. Subsequently, the perturbation method
of many-body Green's function was employed and the 1st-order self-energy
[$\Sigma^{(1)}(\bm k)$] and 2nd-order self-energy [$\Sigma^{(2)}(\bm
k,\varepsilon_{\bm k})$] of magnon were obtained. Numerical computations reveal
that the corrections from both $\Sigma^{(1)}(\bm k)$ and $\Sigma^{(2)}(\bm
k,\varepsilon_{\bm k})$ strongly rely on momentum and temperature, with the
energy renormalization near the Brillouin zone (BZ) boundary being
significantly more pronounced than that near the BZ center. Furthermore, our
findings indicate the occurrence of dip structures in the renormalized magnon
spectrum near the $\rm K$ and $\rm M$ points. These dip structures are
determined to be attributed to the influence of $\Sigma^{(2)}(\bm
k,\varepsilon_{\bm k})$.
Interlayer exciton diffusion is studied in atomically-reconstructed
MoSe2/WSe2 heterobilayers with suppressed disorder. Local atomic registry is
confirmed by characteristic optical absorption, circularly-polarized
photoluminescence, and g-factor measurements. Using transient microscopy we
observe propagation properties of interlayer excitons that are independent from
trapping at moir\'e- or disorder-induced local potentials. Confirmed by
characteristic temperature dependence for free particles, linear diffusion
coefficients of interlayer excitons at liquid helium temperature and low
excitation densities are almost 1000 times higher than in previous
observations. We further show that exciton-exciton repulsion and annihilation
contribute nearly equally to non-linear propagation by disentangling the two
processes in the experiment and simulations. Finally, we demonstrate effective
shrinking of the light-emission over time across several 100's of picoseconds
at the transition from exciton- to the plasma-dominated regimes. Supported by
microscopic calculations for bandgap renormalization to identify Mott
threshold, this indicates transient crossing between rapidly expanding,
short-lived electron-hole plasma and slower, long-lived exciton populations.
The boom of semiconductor quantum computing platforms created a demand for
computer-aided design and fabrication of quantum devices. Path integral Monte
Carlo (PIMC) can have an important role in this effort because it intrinsically
integrates strong quantum correlations that often appear in these
multi-electron systems. In this paper we present a PIMC algorithm that
estimates exchange interactions of three-dimensional electrically defined
quantum dots. We apply this model to silicon metal-oxide-semiconductor (MOS)
devices and we benchmark our method against well-tested full configuration
interaction (FCI) simulations. As an application, we study the impact of a
single charge trap on two exchanging dots, opening the possibility of using
this code to test the tolerance to disorder of CMOS devices. This algorithm
provides an accurate description of this system, setting up an initial step to
integrate PIMC algorithms into development of semiconductor quantum computers.
We classify different ways to passively protect classical and quantum
information, i.e. we do not allow for syndrome measurements, in the context of
local Lindblad models for spin systems. Within this family of models, we
suggest that passive error correction is associated with nontrivial phases of
matter and propose a definition for dissipative phases based on robust steady
state degeneracy of a Lindbladian in the thermodynamic limit. We study three
thermalizing models in this context: the 2D Ising model, the 2D toric code, and
the 4D toric code. In the low-temperature phase, the 2D Ising model hosts a
robust classical steady state degeneracy while the 4D toric code hosts a robust
quantum steady state degeneracy. We perturb the models with terms that violate
detailed balance and observe that qualitative features remain unchanged,
suggesting that $\mathbb{Z}_2$ symmetry breaking in a Lindbladian is useful to
protect a classical bit while intrinsic topological order protects a qubit.
Those fundamental properties, such as phase transitions, Weyl fermions and
spin excitation, in all magnetic ordered materials was ultimately believed to
rely on the symmetry theory of magnetic space groups. Recently, it has come to
light that a more comprehensive group, known as the spin space group (SSG),
which combines separate spin and spatial operations, is necessary to fully
characterize the geometry and physical properties of magnetic ordered materials
such as altermagnets. However, the basic theory of SSG has been seldomly
developed. In this work, we present a systematic study of the enumeration and
the representation theory of SSG. Starting from the 230 crystallographic space
groups and finite translational groups with a maximum order of 8, we establish
an extensive collection of over 80,000 SSGs under a four-segment nomenclature.
We then identify inequivalent SSGs specifically applicable to collinear,
coplanar, and noncoplanar magnetic configurations. Moreover, we derive the
irreducible co-representations of the little group in momentum space within the
SSG framework. Finally, we illustrate the SSGs and band degeneracies resulting
from SSG symmetries through several representative material examples, including
a well-known altermagnet RuO2, and a spiral magnet CeAuAl3. Our work advances
the field of group theory in describing magnetic ordered materials, opening up
avenues for deeper comprehension and further exploration of emergent phenomena
in magnetic materials.
In the paper "Life, the Universe, and everything--42 fundamental questions",
Roland Allen and Suzy Lidstr\"om presented personal selection of the
fundamental questions. Here, based on the condensed matter experience, we
suggest the answers to some questions concerning the vacuum energy, black hole
entropy and the origin of gravity. In condensed matter we know both the
many-body phenomena emerging on the macroscopic level and the microscopic
(atomic) physics, which generates this emergence. It appears that the same
macroscopic phenomenon may be generated by essentially different microscopic
backgrounds. This points to various possible directions in study of the deep
quantum vacuum of our Universe.
An ensemble of massless fermions can be characterized by its total helicity
charge given by the sum of axial charges of particles minus the sum of axial
charges of antiparticles. We show that charged massless fermions develop a
dissipationless flow of helicity along the background magnetic field. We dub
this transport phenomenon as the Helical Separation Effect (HSE). Contrary to
its chiral cousin, the Chiral Separation Effect, the HSE produces the helical
current in a neutral plasma in which all chemical potentials vanish. In
addition, we uncover the Helical Magnetic Heat Effect which generates a heat
flux of Dirac fermions along the magnetic field in the presence of
non-vanishing helical charge density. We also discuss possible hydrodynamic
modes associated with the HSE in neutral plasma.
Optical spectroscopy of quantum materials at ultralow temperatures is rarely
explored, yet it may provide critical characterizations of quantum phases not
possible using other approaches. We describe the development of a novel
experimental platform that enables optical spectroscopic studies, together with
standard electronic transport, of materials at millikelvin temperatures inside
a dilution refrigerator. The instrument is capable of measuring both bulk
crystals and micron-sized two-dimensional van der Waals materials and devices.
We demonstrate the performance by implementing photocurrent-based Fourier
transform infrared spectroscopy on a monolayer WTe$_2$ device and a multilayer
1T-TaS$_2$ crystal, with a spectral range available from near-infrared to
terahertz range and in magnetic fields up to 5 T. In the far-infrared regime,
we achieve spectroscopic measurements at a base temperature as low as ~ 43 mK
and a sample electron temperature of ~ 450 mK. Possible experiments and
potential future upgrades of this versatile instrumental platform are
envisioned.

Date of feed: Fri, 04 Aug 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]+) **Topological magnon-photon interaction for cavity magnonics. (arXiv:2308.01349v1 [cond-mat.mes-hall])**

Jongjun M. Lee, Myung-Joong Hwang, Hyun-Woo Lee

**Absence of Weak Localization on Negative Curvature Surfaces. (arXiv:2308.01351v1 [cond-mat.dis-nn])**

Jonathan B. Curtis, Prineha Narang, Victor Galitski

**Revival of antibiskyrmionic magnetic phases in bilayer NiI$_2$. (arXiv:2308.01484v1 [cond-mat.mes-hall])**

Jyotirish Das, Muhammad Akram, Onur Erten

**Polarity of the fermionic condensation in the $p$-wave Kitaev model on a square lattice. (arXiv:2308.01494v1 [cond-mat.str-el])**

E. S. Ma, Z. Song

**Successful growth and room temperature ambient-pressure magnetic levitation of LK-99. (arXiv:2308.01516v1 [cond-mat.supr-con])**

Hao Wu, Li Yang, Bichen Xiao, Haixin Chang

**High-throughput screening of Weyl semimetals. (arXiv:2308.01663v1 [cond-mat.mtrl-sci])**

Davide Grassano, Davide Campi, Nicola Marzari

**Disorder Effects on the Quasiparticle and Transport Properties of Two-Dimensional Dirac Fermionic Systems. (arXiv:2308.01680v1 [cond-mat.mes-hall])**

Bo Fu, Yanru Chen, Weiwei Chen, Wei Zhu, Ping Cui, Qunxiang Li, Zhenyu Zhang, Qinwei Shi

**Flavor-wave theory with quasiparticle damping at finite temperatures: Application to chiral edge modes in the Kitaev model. (arXiv:2308.01711v1 [cond-mat.str-el])**

Shinnosuke Koyama, Joji Nasu

**Energy spectrum of valence band in HgTe quantum wells on the way from a two to the three dimensional topological insulator. (arXiv:2308.01745v1 [cond-mat.mes-hall])**

G. M. Minkov, O. E. Rut, A. A. Sherstobitov, S. A. Dvoretski, N. N. Mikhailov, V. Ya. Aleshkin

**Anyons in a highly-entangled toric xy model. (arXiv:2308.01765v1 [cond-mat.str-el])**

Milo Moses, Konrad Deka

**Coupled quantum vortex kinematics and Berry curvature in real space. (arXiv:2202.13210v3 [physics.optics] UPDATED)**

Lorenzo Dominici, Amir Rahmani, David Colas, Dario Ballarini, Milena De Giorgi, Giuseppe Gigli, Fabrice P. Laussy, Daniele Sanvitto, Nina Voronova

**Hund bands in spectra of multiorbital systems. (arXiv:2210.11209v3 [cond-mat.str-el] UPDATED)**

M. Środa, J. Mravlje, G. Alvarez, E. Dagotto, J. Herbrych

**Baby Skyrmion in two-component holographic superfluids. (arXiv:2210.12490v3 [hep-th] UPDATED)**

Shunhui Yao, Yu Tian, Peng Yang, Hongbao Zhang

**Variational Tensor Wavefunctions for the Interacting Quantum Spin Hall Phase. (arXiv:2302.03879v2 [cond-mat.str-el] UPDATED)**

Yixin Ma, Shenghan Jiang, Chao Xu

**BCS-BCS crossover between atomic and molecular superfluids in a Bose-Fermi mixture. (arXiv:2302.04617v2 [cond-mat.quant-gas] UPDATED)**

Yixin Guo, Hiroyuki Tajima, Tetsuo Hatsuda, Haozhao Liang

**Compact expansion of a repulsive suspension. (arXiv:2302.14756v2 [cond-mat.soft] UPDATED)**

Matan Yah Ben Zion, Naomi Oppenheimer

**Measurement Quantum Cellular Automata and Anomalies in Floquet Codes. (arXiv:2304.01277v2 [quant-ph] UPDATED)**

David Aasen, Jeongwan Haah, Zhi Li, Roger S. K. Mong

**Magnon-magnon interaction in monolayer MnBi$_2$Te$_4$. (arXiv:2304.09637v2 [cond-mat.str-el] UPDATED)**

Yiqun Liu, Liangjun Zhai, Songsong Yan, Di Wang, Xiangang Wan

**Non-linear and negative effective diffusivity of optical excitations in moir\'e-free heterobilayers. (arXiv:2306.12339v2 [cond-mat.mes-hall] UPDATED)**

Edith Wietek, Matthias Florian, Jonas M. Göser, Takashi Taniguchi, Kenji Watanabe, Alexander Högele, Mikhail M. Glazov, Alexander Steinhoff, Alexey Chernikov

**Path integral simulation of exchange interactions in CMOS spin qubits. (arXiv:2307.03455v3 [cond-mat.mes-hall] UPDATED)**

Jesús D. Cifuentes, Philip Y. Mai, Frédéric Schlattner, H. Ekmel Ercan, MengKe Feng, Christopher C. Escott, Andrew S. Dzurak, Andre Saraiva

**Dissipative phase transitions and passive error correction. (arXiv:2307.09512v2 [quant-ph] UPDATED)**

Yu-Jie Liu, Simon Lieu

**Enumeration and representation of spin space groups. (arXiv:2307.10369v2 [cond-mat.mtrl-sci] UPDATED)**

Jun Ren, Xiaobing Chen, Yanzhou Zhu, Yutong Yu, Ao Zhang, Jiayu Li, Yuntian Liu, Caiheng Li, Qihang Liu

**Views on gravity from condensed matter physics. (arXiv:2307.14370v3 [cond-mat.other] UPDATED)**

G.E. Volovik

**Helical Separation Effect and helical heat transport for Dirac fermions. (arXiv:2307.14987v2 [hep-th] UPDATED)**

Victor E. Ambruş, Maxim N. Chernodub

**A Platform for Far-Infrared Spectroscopy of Quantum Materials at Millikelvin Temperatures. (arXiv:2308.00610v2 [cond-mat.mes-hall] UPDATED)**

Michael Onyszczak, Ayelet J. Uzan, Yue Tang, Pengjie Wang, Yanyu Jia, Guo Yu, Tiancheng Song, Ratnadwip Singha, Jason F. Khoury, Leslie M. Schoop, Sanfeng Wu

Found 10 papers in prb Rare Earth (RE) ion doped nanomaterials are promising candidates for a range of quantum technology applications. Among RE ions, the so-called Kramers' ions possess spin transitions in the GHz range at low magnetic fields, which allows for high-bandwidth multimode quantum storage, fast qubit operatio… The Hatano-Nelson model is one of the most prototypical non-Hermitian models that exhibit the intrinsic non-Hermitian topological phases and the concomitant skin effect. These phenomena unique to non-Hermitian topological systems originate from the Galilean transformation. Here, we extend such an id… We investigate the energy band structure and energy levels of a heterojunction composed of two antiferromagnetic graphene nanoflakes with opposite in-plane antiferromagnetic orderings, in which the modified Kane-Mele model is employed. Before forming an antiferromagnetic graphene heterojunction, the… We study the interplay of two distinct non-Hermitian parameters: directional coupling and on-site gain and loss, together with topology, in coupled one-dimensional non-Hermitian Su-Schrieffer-Heeger (SSH) chains. The SSH model represents one of the simplest two-band models that features boundary-loc… We demonstrate field-induced single-ion magnetic anisotropy resulting from the multiorbital Kondo effect on the diluted ytterbium alloy $({\mathrm{Lu}}_{1−x}{\mathrm{Yb}}_{x}){\mathrm{Rh}}_{2}{\mathrm{Zn}}_{20}$. Single-ion anisotropic metamagnetic behavior is revealed in low-temperature regions whe… The Fermi surface — the manifold of gapless excitations forming due to Pauli’s famous exclusion principle— determines all electronic properties of metals. In 1952 Lars Onsager discovered how to measure a Fermi surface by studying the response of a metallic material as a function of an applied magnetic field. In fact, observables like electrical resistivity or the magnetization oscillate as a function of inverse field. Onsager’s relation forms the basis for our understanding of electronic properties of metals and is used in many experimental labs around the world. Here, the authors find that, in the presence of strong interactions between electrons, Onsager’s relation can be violated and they provide the first rigorous calculations of this effect. In general, solving for the emergent Landau levels of a strongly interacting material in a magnetic field is a hard problem. The methodological progress made here is enabled by concentrating on an exactly soluble model with infinite-range interactions. This research establishes the importance of inter Landau level interactions for understanding correlated materials in magnetic fields. We analyze the possible dynamical chiral symmetry-breaking patterns taking place within Weyl type of materials. Here, these systems are modeled by the $(2+1)$-dimensional Gross-Neveu model with a tilt in the Dirac cone. The optimized perturbation theory (OPT) is employed in order to evaluate the eff… Plasma echo is a dramatic manifestation of plasma damping process reversibility. In this paper we calculate temporal and spatial plasma echoes in graphene in the acoustic plasmon regime when echoes dominate over plasmon emission. We show an extremely strong spatial echo response and discuss how elec… A recent work by Zhao Due to its strong magneto-optical response, plasmons in graphene can be actively tuned by a static magnetic field, resulting in another quasiparticle called graphene magnetoplasmon (GMP). In this work, we theoretically investigate GMPs in graphene disks with their two halves subject to two magnetic …

Date of feed: Fri, 04 Aug 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]+) **Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications**

Mohammed K. Alqedra, Chetan Deshmukh, Shuping Liu, Diana Serrano, Sebastian P. Horvath, Safi Rafie-Zinedine, Abdullah Abdelatief, Lars Rippe, Stefan Kröll, Bernardo Casabone, Alban Ferrier, Alexandre Tallaire, Philippe Goldner, Hugues de Riedmatten, and Andreas Walther

Author(s): Mohammed K. Alqedra, Chetan Deshmukh, Shuping Liu, Diana Serrano, Sebastian P. Horvath, Safi Rafie-Zinedine, Abdullah Abdelatief, Lars Rippe, Stefan Kröll, Bernardo Casabone, Alban Ferrier, Alexandre Tallaire, Philippe Goldner, Hugues de Riedmatten, and Andreas Walther

[Phys. Rev. B 108, 075107] Published Thu Aug 03, 2023

**Non-Hermitian boost deformation**

Taozhi Guo, Kohei Kawabata, Ryota Nakai, and Shinsei Ryu

Author(s): Taozhi Guo, Kohei Kawabata, Ryota Nakai, and Shinsei Ryu

[Phys. Rev. B 108, 075108] Published Thu Aug 03, 2023

**Engineering topologically protected zero-dimensional interface end states in antiferromagnetic heterojunction graphene nanoflakes**

Cheng-Ming Miao, Yu-Hao Wan, Qing-Feng Sun, and Ying-Tao Zhang

Author(s): Cheng-Ming Miao, Yu-Hao Wan, Qing-Feng Sun, and Ying-Tao Zhang

[Phys. Rev. B 108, 075401] Published Thu Aug 03, 2023

**Emerging exceptional point with breakdown of the skin effect in non-Hermitian systems**

Sayan Jana and Lea Sirota

Author(s): Sayan Jana and Lea Sirota

[Phys. Rev. B 108, 085104] Published Thu Aug 03, 2023

**Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy ${(\mathrm{Lu},\mathrm{Yb})\mathrm{Rh}}_{2}{\mathrm{Zn}}_{20}$**

T. Kitazawa, Y. Ikeda, T. Sakakibara, A. Matsuo, Y. Shimizu, Y. Tokunaga, Y. Haga, K. Kindo, Y. Nambu, K. Ikeuchi, K. Kamazawa, M. Ohkawara, and M. Fujita

Author(s): T. Kitazawa, Y. Ikeda, T. Sakakibara, A. Matsuo, Y. Shimizu, Y. Tokunaga, Y. Haga, K. Kindo, Y. Nambu, K. Ikeuchi, K. Kamazawa, M. Ohkawara, and M. Fujita

[Phys. Rev. B 108, 085105] Published Thu Aug 03, 2023

**Quantum oscillations in a doped Mott insulator beyond Onsager's relation**

Valentin Leeb and Johannes Knolle

Author(s): Valentin Leeb and Johannes Knolle

[Phys. Rev. B 108, 085106] Published Thu Aug 03, 2023

**First-order phase transitions within Weyl type of materials at low temperatures**

Y. M. P. Gomes, Everlyn Martins, Marcus Benghi Pinto, and Rudnei O. Ramos

Author(s): Y. M. P. Gomes, Everlyn Martins, Marcus Benghi Pinto, and Rudnei O. Ramos

[Phys. Rev. B 108, 085107] Published Thu Aug 03, 2023

**Plasma echoes in graphene**

Marinko Jablan

Author(s): Marinko Jablan

[Phys. Rev. B 108, 085404] Published Thu Aug 03, 2023

**Apparent Kondo effect in Moiré transition metal dichalcogenide bilayers: Heavy fermions versus disorder**

Prathyush P. Poduval, Katharina Laubscher, and Sankar Das Sarma

Author(s): Prathyush P. Poduval, Katharina Laubscher, and Sankar Das Sarma*et al.* [Nature (London) **616**, 61 (2023)] reported the realization of a synthetic Kondo lattice in a gate-tunable Moiré transition metal dichalcogenide bilayer system. The observation of a Kondo lattice is supported by a plateau (or dip, depending on filling) in the temperature d…

[Phys. Rev. B 108, 085405] Published Thu Aug 03, 2023

**Chemical potential and magnetic field effects on graphene magnetoplasmons**

Ningning Wang, Linhui Ding, and Weihua Wang

Author(s): Ningning Wang, Linhui Ding, and Weihua Wang

[Phys. Rev. B 108, 085406] Published Thu Aug 03, 2023

Found 3 papers in prl We study the nonequilibrium dynamics of dipoles confined in multiple stacked two-dimensional layers realizing a long-range interacting quantum spin $1/2$ XXX model. We demonstrate that strong in-plane interactions can protect a manifold of collective layer dynamics. This then allows us to map the ma… The chiral surface states of Weyl semimetals have an open Fermi surface called a Fermi arc. At the interface between two Weyl semimetals, these Fermi arcs are predicted to hybridize and alter their connectivity. In this Letter, we numerically study a one-dimensional (1D) dielectric trilayer grating … A successful probing of the neutral Majorana mode in recent thermal Hall conductivity measurements opines in favor of the particle-hole symmetric Pfaffian (PH-Pf) topological order, contrasting the theoretical predictions of Pfaffian or anti-Pfaffian phases. Here we report a reentrant anomalous quan…

Date of feed: Fri, 04 Aug 2023 03:17:07 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]+) **Manipulating Growth and Propagation of Correlations in Dipolar Multilayers: From Pair Production to Bosonic Kitaev Models**

Thomas Bilitewski and Ana Maria Rey

Author(s): Thomas Bilitewski and Ana Maria Rey

[Phys. Rev. Lett. 131, 053001] Published Thu Aug 03, 2023

**Fermi Arc Reconstruction in Synthetic Photonic Lattice**

D.-H.-Minh Nguyen, Chiara Devescovi, Dung Xuan Nguyen, Hai Son Nguyen, and Dario Bercioux

Author(s): D.-H.-Minh Nguyen, Chiara Devescovi, Dung Xuan Nguyen, Hai Son Nguyen, and Dario Bercioux

[Phys. Rev. Lett. 131, 053602] Published Thu Aug 03, 2023

**Anomalous Reentrant $5/2$ Quantum Hall Phase at Moderate Landau-Level-Mixing Strength**

Sudipto Das, Sahana Das, and Sudhansu S. Mandal

Author(s): Sudipto Das, Sahana Das, and Sudhansu S. Mandal

[Phys. Rev. Lett. 131, 056202] Published Thu Aug 03, 2023

Found 2 papers in pr_res The Fermi sea topology is characterized by the Euler characteristic ${χ}_{F}$. In this paper, we examine how ${χ}_{F}$ of the metallic state is inherited by the topological invariant of the superconducting state. We establish a correspondence between the Euler characteristic and the Chern number $C$… The photoemission cross section of graphene is measured for two light polarizations and a wide range of photon energies at a flux-calibrated synchrotron light source. Modeling scattering effects by a simplistic model and sophisticated time-dependent density-functional-theory calculations, the complex phase shifts in the photoemission final state are extracted from the experiment to obtain complete information about the photoemission process.

Date of feed: Fri, 04 Aug 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]+) **Euler-Chern correspondence via topological superconductivity**

Fan Yang, Xingyu Li, and Chengshu Li

Author(s): Fan Yang, Xingyu Li, and Chengshu Li

[Phys. Rev. Research 5, 033073] Published Thu Aug 03, 2023

**Simple extension of the plane-wave final state in photoemission: Bringing understanding to the photon-energy dependence of two-dimensional materials**

Christian S. Kern, Anja Haags, Larissa Egger, Xiaosheng Yang, Hans Kirschner, Susanne Wolff, Thomas Seyller, Alexander Gottwald, Mathias Richter, Umberto De Giovannini, Angel Rubio, Michael G. Ramsey, François C. Bocquet, Serguei Soubatch, F. Stefan Tautz, Peter Puschnig, and Simon Moser

Author(s): Christian S. Kern, Anja Haags, Larissa Egger, Xiaosheng Yang, Hans Kirschner, Susanne Wolff, Thomas Seyller, Alexander Gottwald, Mathias Richter, Umberto De Giovannini, Angel Rubio, Michael G. Ramsey, François C. Bocquet, Serguei Soubatch, F. Stefan Tautz, Peter Puschnig, and Simon Moser

[Phys. Rev. Research 5, 033075] Published Thu Aug 03, 2023

Found 1 papers in nano-lett

Date of feed: Thu, 03 Aug 2023 13:05:35 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **[ASAP] Weyl Phonons in Chiral Crystals**

Tiantian Zhang, Zhiheng Huang, Zitian Pan, Luojun Du, Guangyu Zhang, and Shuichi MurakamiNano LettersDOI: 10.1021/acs.nanolett.3c02132

Found 3 papers in acs-nano

Date of feed: Thu, 03 Aug 2023 13:02:50 GMT**Search terms: **(topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+) **[ASAP] Dilute Rhenium Doping and its Impact on Defects in MoS2**

Riccardo Torsi, Kyle T. Munson, Rahul Pendurthi, Esteban Marques, Benoit Van Troeye, Lysander Huberich, Bruno Schuler, Maxwell Feidler, Ke Wang, Geoffrey Pourtois, Saptarshi Das, John B. Asbury, Yu-Chuan Lin, and Joshua A. RobinsonACS NanoDOI: 10.1021/acsnano.3c02626

**[ASAP] Charging of Vitreous Samples in Cryogenic Electron Microscopy Mitigated by Graphene**

Yue Zhang, J. Paul van Schayck, Adrián Pedrazo-Tardajos, Nathalie Claes, Willem E. M. Noteborn, Peng-Han Lu, Hans Duimel, Rafal E. Dunin-Borkowski, Sara Bals, Peter J. Peters, and Raimond B. G. RavelliACS NanoDOI: 10.1021/acsnano.3c03722

**[ASAP] Wireless Electrical Signals Induce Functional Neuronal Differentiation of BMSCs on 3D Graphene Framework Driven by Magnetic Field**

Haoyang Gao, Chunhui Sun, Shuo Shang, Baojun Sun, Mingyuan Sun, Shuang Hu, Hongru Yang, Ying Hu, Zhichao Feng, Weijia Zhou, Chao Liu, Jingang Wang, and Hong LiuACS NanoDOI: 10.1021/acsnano.3c05725

Found 1 papers in scipost **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]+) **Symmetries and topological operators, on average, by Andrea Antinucci, Giovanni Galati, Giovanni Rizi and Marco Serone**

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Submitted on 2023-08-03, refereeing deadline 2023-09-08.