Found 29 papers in cond-mat Particulate air pollution is taking a huge toll on modern society, being
associated with more than three million deaths per year. In addition, airborne
infectious microorganism can spread dangerous diseases, further elevating the
problem. A common way to mitigate the risks of airborne particles is by air
filtration. However, conventional air filters usually do not provide any
functionality beyond particle removal. They are unable to inactivate
accumulated contaminants and therefore need periodic maintenance and
replacement to remain operational and safe. This work presents a
multifunctional, self-cleaning air filtration system which utilizes a novel
graphene-enhanced air filter medium (GeFM). The hybrid network of the GeFM
combines the passive structure-based air filtration properties of an underlying
ceramic network with additional active features based on the functional
properties of a graphene thin film. The GeFM is able to capture >95 % of
microorganisms and particles larger than 1 $\mu$m and can be repetitively
Joule-heated to >300 {\deg}C for several hours without signs of degradation.
Hereby, built-up organic particulate matter and microbial contaminants are
effectively decomposed, regenerating the GeFM. Additionally, the GeFM provides
unique options to monitor the filter's air troughput and loading status during
operation. The active features of the GeFM can drastically improve filter
life-time and safety, offering great potential for the development of safer and
more sustainable air filtration solutions to face the future challenges of air
pollution and pandemics.
Strong zero modes are edge-localized degrees of freedom capable of storing
information at infinite temperature, even in systems with no disorder. To date,
their stability has only been systematically explored at the physical edge of a
system. Here, we extend the notion of strong zero modes to the boundary between
two systems, and present a unifying framework for the stability of these
boundary strong zero modes. Unlike zero-temperature topological edge modes,
which are guaranteed to exist at the interface between a trivial and
topological phase, the robustness of boundary strong zero modes is
significantly more subtle. This subtlety is perhaps best illustrated by the
following dichotomy: we find that the interface between a trivial and ordered
phase does not guarantee the existence of a strong zero mode, while the
interface between two ordered phases can, in certain cases, lead to an exact
strong zero mode.
We consider a configuration of three stacked graphene monolayers with
commensurate twist angles $\theta_{12}/\theta_{23}=p/q$, where $p$ and $q$ are
coprime integers with $0<p<|q|$ and $q$ can be positive or negative. We study
this system using the continuum model in the chiral limit when interlayer
coupling terms between $\textrm{AA}_{12}$ and $\textrm{AA}_{23}$ sites of the
moir\'{e} patterns $12$ and $23$ are neglected. There are only three
inequivalent displacements between the moir\'{e} patterns $12$ and $23$, at
which the three monolayers' Dirac zero modes are protected. Remarkably, for
these displacements and an arbitrary $p/q$ we discover exactly flat bands at an
infinite set of twist angles (magic angles). We provide theoretical explanation
and classification of all possible configurations and topologies of the flat
bands.
Global symmetries greatly enrich the landscape of topological quantum phases,
playing an essential role from symmetry-protection of topological insulators to
symmetry charge fractionalization on anyons in fractional quantum Hall effect.
Topological phases in mixed quantum states, originating from decoherence in
open quantum systems or disorders in imperfect crystalline solids, have
recently garnered significant interest. Unlike pure states, mixed quantum
states can exhibit average symmetries -- symmetries that keep the total
ensemble invariant but not on each individual state. It was realized that
symmetry-protected topological phases could be well-defined for such mixed
states carrying average symmetries. In this work, we present a systematic
classification and characterization of average symmetry-protected topological
(ASPT) phases applicable to generic symmetry groups, encompassing both average
and exact symmetries, for bosonic and fermionic systems. Moreover, we formulate
the theory of average symmetry-enriched topological (ASET) orders in disordered
bosonic systems. We demonstrate that numerous concepts from pure state
symmetry-enriched topological (SET) phases, such as anyon permutation, symmetry
fractionalization, and 't Hooft anomaly, are well-defined for ASET phases but
with various intriguing twists. Our systematic approach helps clarify nuanced
issues in previous literature and uncovers compelling new physics.
We study topological magnons on an anisotropic square-hexagon-octagon (SHO)
lattice which has been found by a two-dimensional Biphenylene network (BPN). We
propose the concepts of type-II Dirac magnonic states where new schemes to
achieve topological magnons are unfolded without requiring the
Dzyaloshinsky-Moriya interactions (DMIs). In the ferromagnetic states, the
topological distinctions at the type-II Dirac points along with one-dimensional
(1D) closed lines of Dirac magnon nodes are characterized by the $\mathbb{Z}_2$
invariant. We find pair annihilation of the Dirac magnons and use the Wilson
loop method to depict the topological protection of the band-degeneracy. The
Green's function approach is used to calculte chiral edge modes and magnon
density of states (DOS). We introduce the DMIs to gap the type-II Dirac magnon
points and demonstrate the Dirac nodal loops (DNLs) are robust against the DMIs
within a certain parameter range. The topological phase diagram of magnon bands
is given via calculating the Berry curvature and Chern number. We find that the
anomalous thermal Hall conductivity gives connection to the magnon edge
current. Furthermore, we derive the differential gyromagnetic ratio to exhibit
the Einstein-de Haas effect (EdH) of magnons with topological features.
A rigorous methodology is developed for computing elastic fields generated by
experimentally observed defect structures within grains in a polycrystal that
has undergone tensile extension. An example application is made using a
near-field High Energy X-ray Diffraction Microscope measurement of a zirconium
sample that underwent $13.6\%$ tensile extension from an initially
well-annealed state. (Sub)grain boundary features are identified with apparent
disclination line defects in them. The elastic fields of these features
identified from the experiment are calculated.
The Lieb-Schultz-Mattis (LSM) theorem provides a general constraint on
quantum many-body systems and plays a significant role in the Haldane gap
phenomena and topological phases of matter. Here, we extend the LSM theorem to
open quantum systems and establish a general theorem that restricts the steady
state and spectral gap of Liouvillians based solely on symmetry. Specifically,
we demonstrate that the unique gapped steady state is prohibited when
translation invariance and $\mathrm{U} \left( 1 \right)$ symmetry are
simultaneously present for noninteger filling numbers. As an illustrative
example, we find that no dissipative gap is open in the spin-$1/2$ dissipative
Heisenberg model while a dissipative gap can be open in the spin-$1$
counterpart -- an analog of the Haldane gap phenomena in open quantum systems.
Furthermore, we show that the LSM constraint manifests itself in a quantum
anomaly of the dissipative form factor of Liouvillians. We also find the LSM
constraints due to symmetry intrinsic to open quantum systems, such as
Kubo-Martin-Schwinger symmetry.
Topotactic transition is a structural phase change in a matrix crystal
lattice mediated by the ordered loss/gain and rearrangement of atoms, leading
to unusual coordination environments and metal atoms with rare valent states.
As early as in 1990s, low temperature hydride reduction was utilized to realize
the topotactic transition. Since then, topological transformations have been
developed via multiple approaches. Especially, the recent discovery of the
Ni-based superconductivity in infinite-layer nickelates has greatly boosted the
topotactic transition mean to synthesizing new oxides for exploring exotic
functional properties. In this review, we have provided a detailed and
generalized introduction to oxygen-related topotactic transition. The main body
of our review include four parts: the structure-facilitated effects, the
mechanism of the topotactic transition, some examples of topotactic transition
methods adopted in different metal oxides (V, Mn, Fe, Co, Ni) and the related
applications. This work is to provide timely and thorough strategies to
successfully realize topotactic transitions for researchers who are eager to
create new oxide phases or new oxide materials with desired functions.
In this work, we present a theoretical research on the lattice relaxations,
phonon properties, and relaxed electronic structures in magic-angle twisted
bilayer graphene (TBG). We construct a continuum elastic model in order to
study the lattice dynamics of magic-angle TBG, where both in-plane and
out-of-plane lattice displacements are take into account. The fully relaxed
lattice structure calculated using such a model is in quantitative agreement
with experimental measurements. Furthermore, we investigate the phonon
properties in magic-angle TBG using the continuum elastic model, where both the
in-plane and out-of-plane phonon modes are included and treated on equal
footing. We identify different types of moir\'e phonons including in-plane
sliding modes, soft out-of-plane flexural modes, as well as out-of-plane
breathing modes. The latter two types of phonon modes exhibit interesting
monopolar, dipolar, quadrupolar, and octupolar-type out-of-plane vibration
patterns. Additionally, we explore the impact of the relaxed moir\'e
superlattice structure on the electronic band structures of magic-angle TBG
using an effective continuum model, which shows nearly exact agreement with
those calculated using a microscopic atomistic tight-binding approach. Our work
lays foundation for further studies on the electron-phonon coupling effects and
their interplay with $e$-$e$ interactions in magic-angle TBG.
Active matter composed of self-propelled particles features a fascinating set
of self-organization phenomena, spanning from motility-induced phase separation
to phototaxis to topological excitations depending on the nature and parameters
of the system. In the present Letter, we consider the formation of micelles
from particles with a broken symmetry having a circular back and a sharpened
nose and moving towards the cusp. As we demonstrate in experiments with robotic
swarms, such particles can either remain in the isotropic phase or form
micelles depending on the location of their center of inertia in accordance
with a recent theoretical proposal [T. Kruglov, A. Borisov, Particles 2021
(2021)]. Crucially, the predicted micellization does not involve any charge
asymmetry, in contrast to that observed in surfactants, and is governed by an
interplay of activity and particle shape asymmetry. This renders the observed
ordering reversible upon switching of the particles' activity and opens the
route towards novel applications in tunable structuring of materials.
Among the family of odd-parity topological superconductors derived from
Bi$_2$Se$_3$, Cu$_x$(PbSe)$_5$(Bi$_2$Se$_3$)$_6$ has been elucidated to have
gap nodes. Although the nodal gap structure has been established by
specific-heat and thermal-conductivity measurements, there has been no direct
observation of the superconducting gap of CPSBS using scanning tunnelling
spectroscopy (STS). Here we report the first STS experiments on CPSBS down to
0.35 K, which found that the vortices generated by out-of-plane magnetic fields
have an elliptical shape, reflecting the anisotropic gap structure. The
orientation of the gap minima is found to be aligned with the bulk direction
when the surface lattice image shows twofold symmetry, but, surprisingly, it is
rotated by 30$^{\circ}$ when twofold symmetry is absent. In addition, the
superconducting gap spectra in zero magnetic field suggest that the gap nodes
are most likely lifted. We argue that only an emergent symmetry at the surface,
allowing for a linear superposition of gap functions with different symmetries,
can lead to the rotation of the gap nodes. The absence of inversion symmetry at
the surface additionally lifts the nodes. This result establishes the subtle
but crucial role of crystalline symmetry in topological superconductivity.
The spatially nonlocal response functions of graphene obtained on the basis
of first principles of quantum field theory using the polarization tensor are
considered in the areas of both the on-the-mass-shell and off-the-mass-shell
waves. It s shown that at zero frequency the longitudinal permittivity of
graphene is the regular function, whereas the transverse one possesses a double
pole for any nonzero wave vector. According to our results, both the
longitudinal and transverse permittivities satisfy the dispersion
(Kramers-Kronig) relations connecting their real and imaginary parts, as well
as expressing each of these permittivities along the imaginary frequency axis
via its imaginary part. For the transverse permittivity, the form of an
additional term arising in the dispersion relations due to the presence of a
double pole is found. The form of dispersion relations is unaffected by the
branch points which arise on the real frequency axis in the presence of spatial
nonlocality. The obtained results are discussed in connection with the well
known problem of the Lifshitz theory which was found to be in conflict with the
measurement data when using the much studied response function of metals. A
possible way of attack on this problem based on the case of graphene is
suggested.
We propose a new class of magnetic proximity effects based on the spin
dependent hybridization between the electronic states at the Fermi energy in a
non-magnetic conductor and the narrow spin split bands of a ferromagnetic
insulator. Unlike conventional exchange proximity, we show this hybridization
proximity effect has a very strong influence on the non-magnetic layer and can
be further modulated by application of an electric field. We use DFT
calculations to illustrate this effect in graphene placed next to a monolayer
of CrI$_3$, a ferromagnetic insulator. We find strong hybridization of the
graphene bands with the narrow conduction band of CrI$_3$ in one spin channel
only. We show that our results are robust with respect to lattice mismatch and
twist angle variations. Furthermore, we show that an out-of-plane electric
field can be used to modulate the hybridization strength, paving the way for
applications.
The quantum Hall effect is widely used for the investigation of fundamental
phenomena, ranging from topological phases to composite fermions. In
particular, the discovery of a room temperature resistance quantum in graphene
is significant for compact resistance standards that can operate above
cryogenic temperatures. However, this requires large magnetic fields that are
accessible only in a few high magnetic field facilities. Here, we report on the
quantum Hall effect in graphene encapsulated by the ferroelectric insulator
CuInP2S6. Electrostatic gating of the graphene channel enables the Fermi energy
to be tuned so that electrons in the localized states of the insulator are in
equilibrium with the current-carrying, delocalized states of graphene. Due to
the presence of strongly bound states in this hybrid system, a quantum Hall
plateau can be achieved at room temperature in relatively modest magnetic
fields. This phenomenon offers the prospect for the controlled manipulation of
the quantum Hall effect at room temperature.
The shift current is part of the second-order optical response of materials
with a close connection to topology. Here we report a sign inversion in the
band-edge shift photoconductivity of the Haldane model when the system
undergoes a topological phase transition. This result is obtained following two
complementary schemes. On one hand, we derive an analytical expression for the
band-edge shift current in a two-band tight-binding model showing that the sign
reversal is driven by the mass term. On the other hand, we perform a numerical
evaluation on a continuum version of the Haldane model. This approach allows us
to include off-diagonal matrix elements of the position operator, which are
discarded in tight-binding models but can contribute significantly to the shift
current. Explicit evaluation of the shift current shows that while the model
predictions remain accurate in the deep tight-binding regime, significant
deviations arise for shallow potential landscapes. Notably, the sign reversal
across the topological phase transition is observed in all regimes, implying it
is a robust effect that could be observable in a wide range of topological
insulators such as $\text{BiTe}_{2}$ and $\text{CsPbI}_{3}$ reported in Phys.
Rev. Lett. 116, 237402 (2016).
The recent discovery of unconventional surface state pairs, which give rise
to Fermi arcs and spin textures, in antiferromagnetically ordered NdBi raised
the interest in rare-earth monopnictides. Several scenarios of
antiferromagnetic order have been suggested to explain the origin of these
states with some of them being consistent with the presence of non-trivial
topologies. In this study, we use angle-resolved photoemission spectroscopy
(ARPES) and density-functional-theory (DFT) calculations to investigate the
electronic structure of NdSb. We found the presence of distinct domains that
have different electronic structure at the surface. These domains correspond to
different orientations of magnetic moments in the AFM state with respect to the
surface. We demonstrated remarkable agreement between DFT calculations and
ARPES that capture all essential changes in the band structure caused by
transition to a magnetically ordered state.
We investigate the electronic properties of a graphene and $\alpha$-ruthenium
trichloride (hereafter RuCl$_3$) heterostructure, using a combination of
experimental and theoretical techniques. RuCl$_3$ is a Mott insulator and a
Kitaev material, and its combination with graphene has gained increasing
attention due to its potential applicability in novel electronic and
optoelectronic devices. By using a combination of spatially resolved
photoemission spectroscopy, low energy electron microscopy, and density
functional theory (DFT) calculations we are able to provide a first direct
visualization of the massive charge transfer from graphene to RuCl$_3$, which
can modify the electronic properties of both materials, leading to novel
electronic phenomena at their interface. The electronic band structure is
compared to DFT calculations that confirm the occurrence of a Mott transition
for RuCl$_3$. Finally, a measurement of spatially resolved work function allows
for a direct estimate of the interface dipole between graphene and RuCl$_3$.
The strong coupling between graphene and RuCl$_3$ could lead to new ways of
manipulating electronic properties of two-dimensional lateral heterojunction.
Understanding the electronic properties of this structure is pivotal for
designing next generation low-power opto-electronics devices.
Although holographic duality has been regarded as a complementary tool in
helping understand the non-equilibrium dynamics of strongly coupled many-body
systems, it still remains a remarkable challenge how to confront its
predictions quantitatively with the real experimental scenarios. By matching
the holographic vortex dynamics with the phenomenological dissipative
Gross-Pitaeviskii models, we find that the holographic dissipation mechanism
can be well captured by the Landau form rather than the Keldysh one, although
the latter is much more widely used in numerical simulations. Our finding is
expected to open up novel avenues for facilitating the quantitative test of the
holographic predictions against the upcoming experimental data. Our result also
provides a prime example how holographic duality can help select proper
phenomenological models to describe far-from-equilibrium nonlinear dynamics
beyond the hydrodynamic regime.
Conventional two-dimensional (2D) higher-order topological insulators are
characterized by higher-order topological states at the outer boundary of
non-trivial regions, that is, 0D topological corner states (TCSs). In this
Letter, it is found that the higher-order topological quasicrystalline
insulators (HOTQIs) have non-0D TCSs arrays at the outer and inner boundaries,
which breaks through the limitation of bulk-edge-corner correspondence
(corresponding dimension is 2D-1D-0D). The universal theoretical framework of
the multimer analysis method is improved and the difference in the average
charge density is proposed as the real-space topological index, which
effectively characterizes the unconventional higher-order topology in HOTQIs.
Furthermore, HOTQIs and their non-0D TCSs arrays in photonic system are
experimentally observed for the first time. These results offer a promising
avenue for investigating TCSs with high integration and multi-region
distribution and pave the way for exploring the topological phenomena and
applications of photonic and phononic quasicrystals.
Twisted bilayer graphene has a rich phase diagram, including
superconductivity. Recently, an unexpected discovery has been the observation
of superconductivity in non-twisted graphene bilayers and trilayers. In this
Perspective, we give an overview of the search for uncommon phases in
non-twisted graphene systems. We first contextualize these recent results
within earlier work in the field, before examining the new experimental
findings. Finally, we analyse the numerous theoretical models that study the
underlying physical processes in these systems
We investigate the consequences of resonant tunneling of Cooper pairs on the
quantum phase slips occurring in a Josephson junction. The amplitude for
quantum tunneling under the Josephson potential barrier is modified by the
Landau-Zener amplitude of adiabatic passage through an Andreev level crossing,
resulting in the suppression of $2\pi$ phase slips. As a consequence, close to
resonance, $4\pi$ phase slips become the dominant tunneling process. We
illustrate this crossover by determining the energy spectrum of a transmon
circuit, showing that a residual charge dispersion persists even at perfect
transparency.
Electrons (or holes) confined in 2D semiconductor layers have served as model
systems for studying disorder and interaction effects for almost 50 years. In
particular, strong disorder drives the metallic 2D carriers into a strongly
localized Anderson insulator (AI) at low densities whereas pristine 2D
electrons in the presence of no (or little) disorder should solidify into a
Wigner crystal at low carrier densities. Since the disorder in 2D
semiconductors is mostly Coulomb disorder arising from random charged
impurities, the applicable physics is complex as the carriers interact with
each other as well as with the random charged impurities through the same
long-range Coulomb coupling. By critically theoretically analyzing the
experimental transport data in depth using a realistic transport theory to
calculate the low-temperature 2D resistivity as a function of carrier density
in 11 different experimental samples covering 9 different materials, we
establish, utilizing the Ioffe-Regel-Mott criterion for strong localization, a
direct connection between the critical localization density for the 2D
metal-insulator transition (MIT) and the sample mobility deep into the metallic
state, which for clean samples could lead to a localization density low enough
to make the transition appear to be a Wigner crystallization. We believe that
the insulating phase is always an effective Coulomb disorder-induced localized
AI, which may have short-range WC-like correlations at low carrier densities.
Our theoretically calculated disorder-driven critical MIT density agrees with
experimental findings in all 2D samples, even for the ultra-clean samples. In
particular, the extrapolated critical density for the 2D MIT seems to vanish
when the high-density mobility goes to infinity, indicating that transport
probes a disorder-localized insulating ground state independent of how low the
carrier density might be.
By imaginary-time evolution with Hamiltonian, an arbitrary state arrives in
the system's ground state. In this work, we conjecture that this dynamics can
be simulated by measurement-only circuit (MoC), where each projective
measurement is set in a suitable way. Based on terms in the Hamiltonian and
ratios of their parameters (coefficients), we propose a guiding principle for
the choice of the measured operators called stabilizers and also the
probability of projective measurement in the MoC. In order to examine and
verify this conjecture of the parameter ratio and probability ratio
correspondence in a practical way, we study a generalized (1+1)-dimensional
$Z_2$ lattice gauge-Higgs model, whose phase diagram is very rich including
symmetry-protected topological phase, deconfinement phase, etc. We find that
the MoC constructed by the guiding principle reproduces phase diagram very
similar to that of the ground state of the gauge-Higgs Hamiltonian. The present
work indicates that the MoC can be broadly used to produce interesting phases
of matter, which are difficult to be simulated by ordinary Hamiltonian systems
composed of stabilizer-type terms.
The emergence of fractonic topological phases and novel universality classes
for quantum dynamics highlights the importance of dipolar symmetry in condensed
matter systems. In this work, we study the properties of symmetry-breaking
phases of the dipolar symmetries in fermionic models in various spatial
dimensions. In such systems, fermions obtain energy dispersion through dipole
condensation. Due to the nontrivial commutation between the translation
symmetry and dipolar symmetry, the Goldstone modes of the dipolar condensate
are strongly coupled to the dispersive fermions and naturally give rise to
non-Fermi liquids at low energies. The IR description of the dipolar
symmetry-breaking phase is analogous to the well-known theory of a Fermi
surface coupled to an emergent U(1) gauge field. We also discuss the crossover
behavior when the dipolar symmetry is slightly broken and the cases with
anisotropic dipolar conservation.
It is now widely recognized that the toric code is a pure gauge-theory model
governed by a projective Hamiltonian with topological orders. In this work, we
extend the interplay between quantum information system and gauge-theory model
from the view point of subsystem code, which is suitable for \textit{gauge
systems including matter fields}. As an example, we show that $Z_2$ lattice
gauge-Higgs model in (2+1)-dimensions with specific open boundary conditions is
noting but a kind of subsystem code. In the system, Gauss-law constraints are
stabilizers, and order parameters identifying Higgs and confinement phases
exist and they are nothing but logical operators in subsystem codes residing on
the boundaries. Mixed anomaly of them dictates the existence of boundary zero
modes, which is a direct consequence of symmetry-protected topological order in
Higgs and confinement phases. After identifying phase diagram, subsystem codes
are embedded in the Higgs and confinement phases. As our main findings, we give
an explicit description of the code (encoded qubit) in the Higgs and
confinement phases, which clarifies duality between Higgs and confinement
phases. The degenerate structure of subsystem code in the Higgs and confinement
phases remains even in very high-energy levels, which is analogous to notion of
strong-zero modes observed in some interesting condensed-matter systems.
Numerical methods are used to corroborate analytically-obtained results and the
obtained spectrum structure supports the analytical description of various
subsystem codes in the gauge theory phases.
After projection to the lowest Landau level translational invariance and
particle conservation combine into dipole symmetry. We show that the new
symmetry forbids spontaneous $U(1)$ symmetry breaking at zero temperature. In
the case of the spatially inhomogeneous magnetic field, where the translational
invariance is absent, we show that the dipole symmetry disappears and the
constraint on the symmetry breaking is lifted. We pay special attention to the
fate of the Girvin-Macdonald-Platzman algebra in the inhomogeneous magnetic
field and show that a natural generalization of it is still present even though
the dipole symmetry is not.
A new concept in magnonics studies the dynamics of spin waves (SWs) in
three-dimensional nanosystems. It is a natural evolution from conventionally
used planar systems to explore magnetization configurations and dynamics in 3D
nanostructures with lengths near intrinsic magnetic scales. In this work, we
perform broadband ferromagnetic resonance (BBFMR) measurements and
micromagnetic simulations of nanoscale magnetic gyroids - a periodic chiral
structure consisting entirely of chiral triple junctions. Our results show
unique properties of the network, such as the localization of the SW modes,
evoking their topological properties, and the substantial sensitivity to the
direction of the static magnetic field. The presented results open a wide range
of applications in the emerging field of 3D magnonic crystals and spintronics.
Graphene aerogel (GA) is a promising material for thermal management
applications across many fields due to its lightweight and thermally insulative
properties. However, standard values for important thermal properties, such as
thermal conductivity, remain elusive due to the lack of reliable
characterization techniques for highly porous materials. Comparative infrared
thermal microscopy (CITM) is an attractive technique to obtain thermal
conductance values of porous materials like GA, due to its non-invasive
character, which requires no probing of, or contact with, the often-delicate
structures and frameworks. In this study, we improve upon CITM by utilizing a
higher resolution imaging setup and reducing the need for pore-filling coating
of the sample (previously used to adjust for emissivity). This upgraded setup,
verified by characterizing porous silica aerogel, allows for a more accurate
confirmation of the fundamental thermal conductivity value of GA while still
accounting for the thermal resistance at material boundaries. Using this
improved method, we measure a thermal conductivity below 0.036 W/m$\cdot$K for
commercial GA using multiple reference materials. These measurements
demonstrate the impact of higher resolution thermal imaging to improve accuracy
in low density, highly porous materials characterization. This study also
reports thermal conductivity for much lower density (less than 15 mg/cm$^3$) GA
than previously published studies while maintaining the robustness of the CITM
technique.
Motivated by the observation of polarization superlattices in twisted
multilayers of hexagonal boron nitride ($h$-BN), we address the possibility of
using these heterostructures for tailoring the properties of multilayer
graphene by means of the electrostatic proximity effect. By using the
combination of first-principles and large-scale tight-binding model
calculations coupled via the Wannier function approach, we demonstrate the
possibility of creating a sequence of well-separated flat-band manifolds in
AB-stacked bilayer graphene at experimentally relevant superlattice
periodicities above $\sim$30 nm. Our calculations show that the details of band
structures depend on the local inversion symmetry breaking and the vertical
electrical polarization, which are directly related to the atomic arrangement.
The results advance the atomistic characterization of graphene-based systems in
a superlattice potential beyond the continuum model.

Date of feed: Mon, 29 May 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]+) **Multifunctional, Self-Cleaning Air Filters Based on Graphene-Enhanced Ceramic Networks. (arXiv:2305.16374v1 [physics.soc-ph])**

Armin Reimers, Ala Bouhanguel, Erik Greve, Morten Möller, Lena Marie Saure, Sören Kaps, Lasse Wegner, Ali Shaygan Nia, Xinliang Feng, Fabian Schütt, Yves Andres, Rainer Adelung

**Boundary Strong Zero Modes. (arXiv:2305.16382v1 [quant-ph])**

Christopher T. Olund, Norman Y. Yao, Jack Kemp

**Magic Angle Butterfly in Twisted Trilayer Graphene. (arXiv:2305.16385v1 [cond-mat.str-el])**

Fedor K. Popov, Grigory Tarnopolsky

**Topological Phases with Average Symmetries: the Decohered, the Disordered, and the Intrinsic. (arXiv:2305.16399v1 [cond-mat.str-el])**

Ruochen Ma, Jian-Hao Zhang, Zhen Bi, Meng Cheng, Chong Wang

**Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice. (arXiv:2305.16419v1 [cond-mat.mes-hall])**

Meng-Han Zhang, Dao-Xin Yao

**Modeling of experimentally observed topological defects inside bulk polycrystals. (arXiv:2305.16454v1 [cond-mat.mtrl-sci])**

Siddharth Singh, He Liu, Rajat Arora, Robert M. Suter, Amit Acharya

**Lieb-Schultz-Mattis Theorem in Open Quantum Systems. (arXiv:2305.16496v1 [cond-mat.stat-mech])**

Kohei Kawabata, Ramanjit Sohal, Shinsei Ryu

**Topotactic Transition: A Promising Opportunity for Creating New Oxides. (arXiv:2305.16605v1 [cond-mat.mtrl-sci])**

Ziang Meng, Han Yan, Peixin Qin, Xiaorong Zhou, Xiaoning Wang, Hongyu Chen, Li Liu, Zhiqi Liu

**Lattice distortions, moir\'e phonons, and relaxed electronic band structures in magic-angle twisted bilayer graphene. (arXiv:2305.16640v1 [cond-mat.mes-hall])**

Bo Xie, Jianpeng Liu

**Experimental demonstration of robotic active matter micellization. (arXiv:2305.16659v1 [cond-mat.soft])**

Anastasia A. Molodtsova, Mikhail K. Buzakov, Alina D. Rozenblit, Vyacheslav A. Smirnov, Daria V. Sennikova, Vadim A. Porvatov, Oleg I. Burmistrov, Ekaterina M. Puhtina, Alexey A. Dmitriev, Nikita A. Olekhno

**Rotation of gap nodes in the topological superconductor Cu$_x$(PbSe)$_5$(Bi$_2$Se$_3$)$_6$. (arXiv:2305.16732v1 [cond-mat.supr-con])**

Mahasweta Bagchi, Jens Brede, Aline Ramires, Yoichi Ando

**Quantum field theoretical framework for the electromagnetic response of graphene and dispersion relations with implications to the Casimir effect. (arXiv:2305.16762v1 [quant-ph])**

G. L. Klimchitskaya, V. M. Mostepanenko

**Strong magnetic proximity effect in Van der Waals heterostructures driven by direct hybridization. (arXiv:2305.16813v1 [cond-mat.mes-hall])**

C. Cardoso, A. T. Costa, A. H. MacDonald, J. Fernández-Rossier

**Room temperature quantum Hall effect in a gated ferroelectric-graphene heterostructure. (arXiv:2305.16825v1 [cond-mat.mes-hall])**

Anubhab Dey, Nathan Cottam, Oleg Makarovskiy, Wenjing Yan, Vaidotas Mišeikis, Camilla Coletti, James Kerfoot, Vladimir Korolkov, Laurence Eaves, Jasper F. Linnartz, Arwin Kool, Steffen Wiedmann, Amalia Patanè

**Shift photoconductivity in the Haldane model. (arXiv:2305.17035v1 [cond-mat.mes-hall])**

Javier Sivianes (1), Julen Ibañez-Azpiroz (1 and 2) ((1) Centro de Física de Materiales (CSIC-UPV/EHU), Donostia-San Sebastián, Spain, (2) Ikerbasque Foundation, Bilbao, Spain)

**Directional effects of antiferromagnetic ordering on the electronic structure in NdSb. (arXiv:2305.17085v1 [cond-mat.str-el])**

Yevhen Kushnirenko, Brinda Kuthanazhi, Lin-Lin Wang, Benjamin Schrunk, Evan O'Leary, Andrew Eaton, P. C. Canfield, Adam Kaminski

**Direct visualization of the charge transfer in Graphene/$\alpha$-RuCl$_3$ heterostructure. (arXiv:2305.17130v1 [cond-mat.mtrl-sci])**

Antonio Rossi, Riccardo Dettori, Cameron Johnson, Jesse Balgley, John C. Thomas, Luca Francaviglia, Andreas K. Schmid, Kenji Watanabe, Takashi Taniguchi, Matthew Cothrine, David G. Mandrus, Chris Jozwiak, Aaron Bostwik, Erik A. Henriksen, Alexander Weber-Bargioni, Eli Rotenberg

**Holographic dissipation prefers the Landau over the Keldysh form. (arXiv:2207.02814v3 [hep-th] UPDATED)**

Yu-Kun Yan, Shanquan Lan, Yu Tian, Peng Yang, Shunhui Yao, Hongbao Zhang

**Unconventional higher-order topology in quasicrystals. (arXiv:2209.05751v2 [cond-mat.mtrl-sci] UPDATED)**

Aoqian Shi, Yiwei Peng, Jiapei Jiang, Yuchen Peng, Peng Peng, Jianzhi Chen, Hongsheng Chen, Shuangchun Wen, Xiao Lin, Fei Gao, Jianjun Liu

**Superconductivity and correlated phases in non-twisted bilayer and trilayer graphene. (arXiv:2211.02880v2 [cond-mat.mes-hall] UPDATED)**

Pierre A. Pantaleon, Alejandro Jimeno-Pozo, Hector Sainz-Cruz, Vo Tien Phong, Tommaso Cea, Francisco Guinea

**Quantum phase slips in a resonant Josephson junction. (arXiv:2211.05660v3 [cond-mat.mes-hall] UPDATED)**

Tereza Vakhtel, Bernard van Heck

**Density-tuned effective metal-insulator transitions in 2D semiconductor layers: Anderson localization or Wigner crystallization. (arXiv:2211.10673v2 [cond-mat.mes-hall] UPDATED)**

Seongjin Ahn, Sankar Das Sarma

**Production of lattice gauge-Higgs topological states in measurement-only quantum circuit. (arXiv:2302.13692v2 [cond-mat.stat-mech] UPDATED)**

Yoshihito Kuno, Ikuo Ichinose

**Non-Fermi Liquids from Dipolar Symmetry Breaking. (arXiv:2304.01181v2 [cond-mat.str-el] UPDATED)**

Amogh Anakru, Zhen Bi

**Interplay between lattice gauge theory and subsystem codes. (arXiv:2304.05718v2 [cond-mat.stat-mech] UPDATED)**

Yoshihito Kuno, Ikuo Ichinose

**A note on GMP algebra, dipole symmetry, and Hohenberg-Mermin-Wagner theorem in the lowest Landau level. (arXiv:2304.09927v2 [cond-mat.str-el] UPDATED)**

Lev Spodyneiko

**Investigation of Spin-Wave Dynamics in Gyroid Nanostructures. (arXiv:2305.06319v2 [cond-mat.mes-hall] UPDATED)**

Mateusz Gołębiewski, Riccardo Hertel, Vitaliy Vasyuchka, Mathias Weiler, Philipp Pirro, Maciej Krawczyk, Shunsuke Fukami, Hideo Ohno, Justin Llandro

**Thermal conductivity of macroporous graphene aerogel measured using high resolution comparative infrared thermal microscopy. (arXiv:2305.09033v2 [physics.app-ph] UPDATED)**

Jasmine M. Cox, Jessica J. Frick, Chen Liu, Zhou Li, Yaprak Ozbakir, Carlo Carraro, Roya Maboudian, Debbie G. Senesky

**Flat bands in bilayer graphene induced by proximity with polar $h$-BN superlattices. (arXiv:2305.09749v2 [cond-mat.mes-hall] UPDATED)**

Marta Brzezińska, Oleg V. Yazyev