Found 27 papers in cond-mat
Date of feed: Thu, 18 Jan 2024 01:30:00 GMT

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Gapless Fermionic Systems as Phase-space Topological Insulators: Non-perturbative Results from Anomalies. (arXiv:2401.08744v1 [cond-mat.str-el])
Taylor L. Hughes, Yuxuan Wang

We present a theory unifying the topological responses and anomalies of various gapless fermion systems exhibiting Fermi surfaces, including those with Berry phases, and nodal structures, which applies beyond non-interacting limit. As our key finding, we obtain a general approach to directly relate gapless fermions and topological insulators in phase space, including first- and higher-order insulators. Using this relation we show that the low-energy properties and response theories for gapless fermionic systems can be directly obtained without resorting to microscopic details. Our results provide a unified framework for describing such systems using well-developed theories from the study of topological phases of matter.

Floquet Flux Attachment in Cold Atomic Systems. (arXiv:2401.08754v1 [quant-ph])
Helia Kamal, Jack Kemp, Yin-Chen He, Yohei Fuji, Monika Aidelsburger, Peter Zoller, Norman Y. Yao

Flux attachment provides a powerful conceptual framework for understanding certain forms of topological order, including most notably the fractional quantum Hall effect. Despite its ubiquitous use as a theoretical tool, directly realizing flux attachment in a microscopic setting remains an open challenge. Here, we propose a simple approach to realizing flux attachment in a periodically-driven (Floquet) system of either spins or hard-core bosons. We demonstrate that such a system naturally realizes correlated hopping interactions and provides a sharp connection between such interactions and flux attachment. Starting with a simple, nearest-neighbor, free boson model, we find evidence -- from both a coupled wire analysis and large-scale density matrix renormalization group simulations -- that Floquet flux attachment stabilizes the bosonic integer quantum Hall state at $1/4$ filling (on a square lattice), and the Halperin-221 fractional quantum Hall state at $1/6$ filling (on a honeycomb lattice). At $1/2$ filling on the square lattice, time-reversal symmetry is instead spontaneously broken and bosonic integer quantum Hall states with opposite Hall conductances are degenerate. Finally, we propose an optical-lattice-based implementation of our model on a square lattice and discuss prospects for adiabatic preparation as well as effects of Floquet heating.

Control of charge-spin interconversion in van der Waals heterostructures with chiral charge density waves. (arXiv:2401.08817v1 [cond-mat.mtrl-sci])
Zhendong Chi, Seungjun Lee, Haozhe Yang, Eoin Dolan, C. K. Safeer, Josep Ingla-Aynés, Franz Herling, Nerea Ontoso, Beatriz Martín-García, Marco Gobbi, Tony Low, Luis E. Hueso, Fèlix Casanova

A charge density wave (CDW) represents an exotic state in which electrons are arranged in a long range ordered pattern in low-dimensional materials. Although our understanding of the fundamental character of CDW has been enriched after extensive studies, its relationship with functional phenomena remains relatively limited. Here, we show an unprecedented demonstration of a tunable charge-spin interconversion (CSI) in graphene/1T-TaS$_2$ van der Waals heterostructures by manipulating the distinct CDW phases in 1T-TaS$_2$. Whereas CSI from spins polarized in all three directions are observed in the heterostructure when the CDW phase does not show commensurability, the output of one of the components disappears and the other two are enhanced when the CDW phase becomes commensurate. The experimental observation is supported by first-principles calculations, which evidence that chiral CDW multidomains are at the origin of the switching of CSI. Our results uncover a new approach for on-demand CSI in low-dimensional systems, paving the way for advanced spin-orbitronic devices.

Structure and lattice excitations of the copper substituted lead oxyapatite Pb$_{9.06(7)}$Cu$_{0.94(6)}$(PO$_{3.92(4)}$)$_{6}$O$_{0.96(3)}$. (arXiv:2401.08834v1 [cond-mat.mtrl-sci])
Qiang Zhang, Yingdong Guan, Yongqiang Cheng, Lujin Min, Jong K. Keum, Zhiqiang Mao, Matthew B. Stone

The copper substituted lead oxyapatite, Pb$_{10-x}$Cu$_{x}$(PO$_{3.92(4)}$)$_{6}$O$_{0.96(3)}$ (x=0.94(6)) was studied using neutron and x-ray diffraction and neutron spectroscopy techniques. The crystal structure of the main phase of our sample, which has come to be colloquially known as LK-99, is verified to possess a hexagonal structure with space group $P 6_{3}/m$, alongside the presence of impurity phases Cu and Cu$_2$S. We determine the primary substitution location of the Cu as the Pb1 ($6h$) site, with a small substitution at the Pb2 ($4f$) site. Consequently, no clear Cu-doping-induced structural distortion was observed in the investigated temperature region between 10~K and 300~K. Specially, we did not observe a reduction of coordinate number at the Pb2 site or a clear tilting of PO$_4$ tetrahedron. Magnetic characterization reveals a diamagnetic signal in the specimen, accompanied by a very weak ferromagnetic component at 2 K. No long-range magnetic order down to 10 K was detected by the neutron diffraction. Inelastic neutron scattering measurements did not show magnetic excitations for energies up to 350 meV. There is no sign of a superconducting resonance in the excitation spectrum of this material. The measured phonon density of states compares well with density functional theory calculations performed for the main LK-99 phase and its impurity phases. Our study may shed some insight into the role of the favored substitution site of copper in the absence of structural distortion and superconductivity in LK-99.

Remote sensing of a levitated superconductor with a flux-tunable microwave cavity. (arXiv:2401.08854v1 [quant-ph])
Philip Schmidt, Remi Claessen, Gerard Higgings, Joachim Hofer, Jannek J. Hansen, Peter Asenbaum, Kevin Uhl, Reinhold Kleiner, Rudolf Gross, Hans Huebl, Michael Trupke, Markus Aspelmeyer

We present a cavity-electromechanical system comprising a superconducting quantum interference device which is embedded in a microwave resonator and coupled via a pick-up loop to a 6 $\mu$g magnetically-levitated superconducting sphere. The motion of the sphere in the magnetic trap induces a frequency shift in the SQUID-cavity system. We use microwave spectroscopy to characterize the system, and we demonstrate that the electromechanical interaction is tunable. The measured displacement sensitivity of $10^{-7} \, \mathrm{m} / \sqrt{\mathrm{Hz}}$, defines a path towards ground-state cooling of levitated particles with Planck-scale masses at millikelvin environment temperatures.

Topological charge pumping in dimerized Kitaev chains. (arXiv:2401.08934v1 [cond-mat.str-el])
E. S. Ma, Z. Song

We investigated the topological pumping charge of a dimerized Kitaev chain with spatially modulated chemical potential, which hosts nodal loops in parameter space and violates particle number conservation. In the simplest case, with alternatively assigned hopping and pairing terms, we show that the model can be mapped into the Rice-Mele model by a partial particle-hole transformation and subsequently supports topological charge pumping as a demonstration of the Chern number for the ground state. Beyond this special case, analytic analysis shows that the nodal loops are conic curves. Numerical simulation of a finite-size chain indicates that the pumping charge is zero for a quasiadiabatic loop within the nodal loop and is $\pm 1$ for a quasiadiabatic passage enclosing the nodal loop. Our findings unveil a hidden topology in a class of Kitaev chains.

Spin Orbit Torque on a Curved Surface. (arXiv:2401.08966v1 [cond-mat.mes-hall])
Seng Ghee Tan, Che Chun Huang, Mansoor B.A.Jalil, Zhuobin Siu

We provide a general formulation of the spin-orbit coupling on a 2D curved surface. Considering the wide applicability of spin-orbit effect in spinor-based condensed matter physics, a general spin-orbit formulation could aid the study of spintronics, Dirac graphene, topological systems, and quantum information on curved surfaces. Particular attention is then devoted to the development of an important spin-orbit quantity known as the spin-orbit torque. As devices trend smaller in dimension, the physics of local geometries on spin-orbit torque, hence spin and magnetic dynamics shall not be neglected. We derived the general expression of a spin-orbit anisotropy field for the curved surfaces and provided explicit solutions in the special contexts of the spherical, cylindrical and flat coordinates. Our expressions allow spin-orbit anisotropy fields and hence spin-orbit torque to be computed over the entire surfaces of devices of any geometry.

Robust flat bands in twisted trilayer graphene quasicrystals. (arXiv:2401.09010v1 [cond-mat.mtrl-sci])
Chen-Yue Hao, Zhen Zhan, Pierre A. Pantaleón, Jia-Qi He, Ya-Xin Zhao, Kenji Watanabe, Takashi Taniguchi, Francisco Guinea, Lin He

Moir\'e structures formed by twisting three layers of graphene with two independent twist angles present an ideal platform for studying correlated quantum phenomena, as an infinite set of angle pairs is predicted to exhibit flat bands. Moreover, the two mutually incommensurate moir\'e patterns among the twisted trilayer graphene (TTG) can form highly tunable moir\'e quasicrystals. This enables us to extend correlated physics in periodic moir\'e crystals to quasiperiodic systems. However, direct local characterization of the structure of the moir\'e quasicrystals and of the resulting flat bands are still lacking, which is crucial to fundamental understanding and control of the correlated moir\'e physics. Here, we demonstrate the existence of flat bands in a series of TTGs with various twist angle pairs and show that the TTGs with different magic angle pairs are strikingly dissimilar in their atomic and electronic structures. The lattice relaxation and the interference between moir\'e patterns are highly dependent on the twist angles. Our direct spatial mappings, supported by theoretical calculations, reveal that the localization of the flat bands exhibits distinct symmetries in different regions of the moir\'e quasicrystals.

Shaping graphene superconductivity with nanometer precision. (arXiv:2401.09288v1 [cond-mat.supr-con])
E. Cortés-del Río, S. Trivini, J.I. Pascual, V. Cherkez, P. Mallet, J-Y. Veuillen, J.C. Cuevas, I. Brihuega

Graphene holds great potential for superconductivity due to its pure two-dimensional nature, the ability to tune its carrier density through electrostatic gating, and its unique, relativistic-like electronic properties. At present, we are still far from controlling and understanding graphene superconductivity, mainly because the selective introduction of superconducting properties to graphene is experimentally very challenging. Here, we have developed a method that enables shaping at will graphene superconductivity through a precise control of graphene-superconductor junctions. The method combines the proximity effect with scanning tunnelling microscope (STM) manipulation capabilities. We first grow Pb nano-islands that locally induce superconductivity in graphene. Using a STM, Pb nano-islands can be selectively displaced, over different types of graphene surfaces, with nanometre scale precision, in any direction, over distances of hundreds of nanometres. This opens an exciting playground where a large number of predefined graphene-superconductor hybrid structures can be investigated with atomic scale precision. To illustrate the potential, we perform a series of experiments, rationalized by the quasi-classical theory of superconductivity, going from the fundamental understanding of superconductor-graphene-superconductor heterostructures to the construction of superconductor nanocorrals, further used as "portable" experimental probes of local magnetic moments in graphene.

Effect of out-of-plane acoustic phonons on the thermal transport properties of graphene. (arXiv:2401.09345v1 [cond-mat.soft])
J. Chen, Y. Liu

The lattice thermal conductivity of graphene is evaluated using a microscopic model that takes into account the lattice's discrete nature and the phonon dispersion relation within the Brillouin zone. The Boltzmann transport equation is solved iteratively within the framework of three-phonon interactions without taking into account the four-phonon scattering process. The Umklapp and normal collisions are treated rigorously, thereby avoiding relaxation-time and long-wavelength approximations. The mechanisms of the failures of these approximations in predicting the thermal transport properties are discussed. Evaluation of the thermal conductivity is performed at different temperatures and frequencies and in different crystallite sizes. Reasonably good agreement with the experimental data is obtained. The calculation reveals a critical role of out-of-plane acoustic phonons in determining the thermal conductivity. The out-of-plane acoustic phonons contribute greatly and the longitudinal and transverse acoustic phonons make small contributions over a wide range of temperatures and frequencies. The out-of-plane acoustic phonons dominate the thermal conductivity due to their high density of states and restrictions governing the anharmonic phonon scattering. The selection rule severely restricts the phase space for out-of-plane phonon scattering due to reflection symmetry. The optical phonon contribution cannot be neglected at higher temperatures. Both Umklapp and normal processes must be taken into account in order to predict the phonon transport properties accurately.

Entropic force in a dilute solution of real ring polymer chains with different topological structures in a slit of two parallel walls with mixed boundary conditions. (arXiv:2401.09353v1 [cond-mat.soft])
P. Kuterba, Z. Danel, W. Janke

The molecular dynamics simulations were used to obtain the radius of gyration of real ring polymer chains with different topological structures consisting of 360 monomers. We focus on the entropic force which is exerted by a dilute solution of ring polymer chains of different topological structures with the excluded volume interaction (EVI) in a good solvent on the confining parallel walls of a slit geometry. We consider mixed boundary conditions of one repulsive wall and the other one at the adsorption threshold. The obtained molecular dynamics simulation results for a wide slit region demonstrate a qualitative agreement with previous analytical results for ideal ring polymers. These results could lead to interesting potential applications in materials engineering and improve understanding of some biological processes suggested in the paper. Additionally, they could be applied in micro- and nano-electromechanical devices (MEMS and NEMS) in order to reduce the static friction.

The role of intrinsic atomic defects in a Janus MoSSe/XN (X = Al, Ga) heterostructure: a first principles study. (arXiv:2401.09365v1 [cond-mat.mtrl-sci])
Ö. C. Yelgel

The interactions between different layers in van der Waals heterostructures have a significant impact on the electronic and optical characteristics. By utilizing the intrinsic dipole moment of Janus transition metal dichalcogenides (TMDs), it is possible to tune these interlayer interactions. We systematically investigate structural and electronic properties of Janus MoSSe monolayer/graphene-like Aluminum Nitrides (MoSSe/g-AlN) heterostructures with point defects by employing density functional theory calculations with the inclusion of the nonlocal van der Waals correction. The findings indicate that the examined heterostructures are energetically and thermodynamically stable, and their electronic structures can be readily modified by creating a heterostructure with the defects in g-AlN monolayer. This heterostructure exhibits an indirect semiconductor with the band gap of 1.627 eV which is in the visible infrared region. It can be of interest for photovoltaic applications. When a single N atom or Al atom is removed from a monolayer of g-AlN in the heterostructure, creating vacancy defects, the material exhibits similar electronic band structures with localized states within the band gap which can be used for deliberately tailoring the electronic properties of the MoSSe/g-AlN heterostructure. These tunable results can offer exciting opportunities for designing nanoelectronics devices based on MoSSe/g-AlN heterojunctions.

Electron binding energy of donor in bilayer graphene with gate-tunable gap. (arXiv:2401.09389v1 [cond-mat.mes-hall])
E. V. Gorbar, V. P. Gusynin, D. O. Oriekhov, B. I. Shklovskii

In gapped bilayer graphene, similarly to conventional semiconductors, Coulomb impurities (such as nitrogen donors) may determine the activation energy of its conductivity and provide low temperature hopping conductivity. However, in spite of importance of Coulomb impurities, nothing is known about their electron binding energy $E_b$ in the presence of gates. To close this gap, we study numerically the electron binding energy $E_b$ of a singly charged donor in BN-enveloped bilayer graphene with the top and bottom gates at distance $d$ and gate-tunable gap $2\Delta$. We show that for $10 < d < 200$ nm and $1 < \Delta < 100$ meV the ratio $E_b/\Delta$ changes from 0.4 to 1.5. The ratio $E_b/\Delta$ stays close to unity because of the dominating role of the bilayer polarization screening which reduces the Coulomb potential well depth to values $\sim \Delta$. Still the ratio $E_b/\Delta$ somewhat decreases with growing $\Delta$, faster at small $\Delta$ and slower at large $\Delta$. On the other hand, $E_b/\Delta$ weakly grows with $d$, again faster at small $\Delta$ and slower at large $\Delta$. We also studied the effect of trigonal warping and found only a small reduction of $E_b/\Delta$.

Effects of Vanadium Doping on the Optical Response and Electronic Structure of WS$_{2}$ Monolayers. (arXiv:2401.09402v1 [cond-mat.mes-hall])
Frederico B. Sousa, Boyang Zheng, Mingzu Liu, Geovani C. Resende, Da Zhou, Marcos A. Pimenta, Mauricio Terrones, Vincent H. Crespi, Leandro M. Malard

Two-dimensional dilute magnetic semiconductors has been recently reported in semiconducting transition metal dichalcogenides by the introduction of spin-polarized transition metal atoms as dopants. This is the case of vanadium-doped WS$_2$ and WSe$_2$ monolayers, which exhibits a ferromagnetic ordering even above room temperature. However, a broadband characterization of their electronic band structure and its dependence on vanadium concentration is still lacking. Therefore, here we perform power-dependent photoluminescence, resonant four-wave mixing, and differential reflectance spectroscopy to study the optical transitions close to the A exciton energy of vanadium-doped WS$_2$ monolayers with distinct concentrations. Instead of a single A exciton peak, vanadium-doped samples exhibit two photoluminescence peaks associated with transitions to occupied and unoccupied bands. Moreover, resonant Raman spectroscopy and resonant second-harmonic generation measurements revealed a blueshift in the B exciton but no energy change in the C exciton as vanadium is introduced in the monolayers. Density functional theory calculations showed that the band structure is sensitive to the Hubbard \(U\) correction for vanadium and several scenarios are proposed to explain the two photoluminescence peaks around the A exciton energy region. Our work provides the first broadband optical characterization of these two-dimensional dilute magnetic semiconductors, shedding light on the novel electronic features of WS$_{2}$ monolayers which are tunable by the vanadium concentration.

Interaction robustness of the chiral anomaly in Weyl semimetals and Luttinger liquids from a mixed anomaly approach. (arXiv:2401.09409v1 [cond-mat.str-el])
Shuyang Wang, Jay D. Sau

The chiral anomaly is one of the robust quantum effects in relativistic field theories with a chiral symmetry where charges in chiral sectors appear to be separately conserved. The chiral anomaly, which is often associated with a renormalization-invariant topological term, is a violation of this conservation law due to quantum effects. Such anomalies manifest in Weyl materials as an electromagnetic field-induced transfer of charge between Fermi pockets. However, the emergent nature of the conservation of chiral charge leads to manifestations of the chiral anomaly response that depend on the details of the system such as the strength of interactions. In this paper, we apply an approach where the chiral symmetry in solid materials is replaced by the combination of charge $U(1)$ gauge and spatial translation symmetry. The chiral anomaly in this case is replaced by a mixed anomaly between the two symmetries and the chiral charge can be defined as being proportional to the total momentum. We show that the chiral anomaly associated with this chiral charge is unrenormalized by interactions in contrast to other chiral charges in $(1+1)D$ whose renormalization is regularization dependent. In $(3+1)$D Weyl systems, this chiral anomaly is equivalent to the charge transferred between Fermi surfaces which can be measured through changes in Fermi-surface-enclosed volume. We propose a pump-probe technique to measure this.

Spin-Resolved Topology and Partial Axion Angles in Three-Dimensional Insulators. (arXiv:2207.10099v3 [cond-mat.mes-hall] UPDATED)
Kuan-Sen Lin, Giandomenico Palumbo, Zhaopeng Guo, Yoonseok Hwang, Jeremy Blackburn, Daniel P. Shoemaker, Fahad Mahmood, Zhijun Wang, Gregory A. Fiete, Benjamin J. Wieder, Barry Bradlyn

Symmetry-protected topological crystalline insulators (TCIs) have primarily been characterized by their gapless boundary states. However, in time-reversal- ($\mathcal{T}$-) invariant (helical) 3D TCI$\unicode{x2014}$termed higher-order TCIs (HOTIs)$\unicode{x2014}$the boundary signatures can manifest as a sample-dependent network of 1D hinge states. We here introduce nested spin-resolved Wilson loops and layer constructions as tools to characterize the intrinsic bulk topological properties of spinful 3D insulators. We discover that helical HOTIs realize one of three spin-resolved phases with distinct responses that are quantitatively robust to large deformations of the bulk spin-orbital texture: 3D quantum spin Hall insulators (QSHIs), "spin-Weyl" semimetals, and $\mathcal{T}$-doubled axion insulator (T-DAXI) states with nontrivial partial axion angles indicative of a 3D spin-magnetoelectric bulk response and half-quantized 2D TI surface states originating from a partial parity anomaly. Using ab-initio calculations, we demonstrate that $\beta$-MoTe$_2$ realizes a spin-Weyl state and that $\alpha$-BiBr hosts both 3D QSHI and T-DAXI regimes.

Composing parafermions: a construction of $Z_{N}$ fractional quantum Hall systems and a modern understanding of confinement and duality. (arXiv:2212.12999v3 [cond-mat.str-el] UPDATED)
Yoshiki Fukusumi

In this work, we propose a modern view of the integer spin simple currents which have played a central role in discrete torsion. We reintroduce them as nonanomalous composite particles constructed from $Z_{N}$ parafermionic field theories. These composite particles have an analogy with the Cooper pair in the Bardeen-Cooper-Schrieffer theory and can be interpreted as a typical example of anyon condensation. Based on these $Z_{N}$ anomaly free composite particles, we propose a systematic construction of the cylinder partition function of $Z_{N}$ fractional quantum Hall effects (FQHEs). One can expect realizations of a class of general topological ordered systems by breaking the bulk-edge correspondence of the bosonic parts of these FQH models. We also give a brief overview of various phenomena in contemporary condensed matter physics, such as $SU(N)$ Haldane conjecture, general gapless and gapped topological order with respect to the quantum anomaly defined by charges of these simple currents and bulk and boundary renormalization group flow. Moreover, we point out an analogy between these FQHEs and 2d quantum gravities coupled to matter, and propose a $Z_{N}$ generalization of supersymmetry known as "fractional supersymmetry" in the composite parafermionic theory and study its analogy with quark confinement. Our analysis gives a simple but general understanding of the contemporary physics of topological phases in the form of the partition functions derived from the operator formalism.

2D MXene Electrochemical Transistors. (arXiv:2303.10768v2 [cond-mat.mtrl-sci] UPDATED)
Jyoti Shakya (1), Min-A Kang (1 and 3), Jian Li (1), Armin VahidMohammadi (5), Weiqian Tian (1 and 4), Erica Zeglio (1), Mahiar Max Hamedi (1 and 2) ((1) Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, 10044 Stockholm, Sweden, (2) Wallenberg Wood Science Center, Teknikringen 56, 10044 Stockholm, Sweden (3) Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA (4) School of Materials Science and Engineering, Ocean University of China, Qingdao, Shandong 266100, China (5) A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA)

In the past two decades another transistor based on conducting polymers, called the organic electrochemical transistor (ECT) was shown and largely studied. The main difference between organic ECTs and FETs is the mode and extent of channel doping: while in FETs the channel only has surface doping through dipoles, the mixed ionic-electronic conductivity of the channel material in Organic ECTs enables bulk electrochemical doping. As a result, the organic ECT maximizes conductance modulation at the expense of speed. Until now ECTs have been based on conducting polymers, but here we show that MXenes, a class of 2D materials beyond graphene, have mixed ionic-electronic properties that enable the realization of electrochemical transistors (ECTs). We show that the formulas for organic ECTs can be applied to these 2D ECTs and used to extract parameters like mobility. These MXene ECTs have high transconductance values but low on-off ratios. We further show that conductance switching data measured using ECT, in combination with other in-situ ex-situ electrochemical measurements, is a powerful tool for correlating the change in conductance to that of redox state: to our knowledge, this is the first report of this important correlation for MXene films. Many future possibilities exist for MXenes ECTs, and we think other 2D materials with bandgaps can also form ECTs with single or heterostructured 2D materials. 2D ECTs can draw great inspiration and theoretical tools from the field of organic ECTs and have the potential to considerably extend the capabilities of transistors beyond that of conducting polymer ECTs, with added properties such as extreme heat resistance, tolerance for solvents, and higher conductivity for both electrons and ions than conducting polymers.

Fate of entanglement in magnetism under Lindbladian or non-Markovian dynamics and conditions for their transition to Landau-Lifshitz-Gilbert classical dynamics. (arXiv:2303.17596v3 [cond-mat.str-el] UPDATED)
Federico Garcia-Gaitan, Branislav K. Nikolic

It is commonly assumed in spintronics and magnonics that localized spins within antiferromagnets are in the N\'{e}el ground state (GS), as well as that such state evolves, when pushed out of equilibrium by current or external fields, according to the Landau-Lifshitz-Gilbert (LLG) equation viewing localized spins as classical vectors of fixed length. On the other hand, the true GS of antiferromagnets is highly entangled, as confirmed by very recent neutron scattering experiments witnessing their entanglement. Although GS of ferromagnets is always unentangled, their magnonic low-energy excitation are superpositions of many-body spin states and, therefore, entangled. In this study, we initialize quantum Heisenberg ferro- or antiferromagnetic chains hosing localized spins $S=1/2$, $S=1$ or $S=5/2$ into unentangled pure state and then evolve them by quantum master equations (QMEs) of Lindblad or non-Markovian type, derived by coupling localized spins to a bosonic bath (such as due to phonons) or by using additional ``reaction coordinate'' in the latter case. The time evolution is initiated by applying an external magnetic field, and entanglement of time-evolving {\em mixed} quantum states is monitored by computing its logarithmic negativity. We find that non-Markovian dynamics maintains some degree of entanglement, which shrinks the length of the vector of spin expectation values, thereby making the LLG equation inapplicable. Conversely, Lindbladian (i.e., Markovian) dynamics ensures that entanglement goes to zero, thereby enabling quantum-to-classical (i.e., to LLG) transition in all cases -- $S=1/2$, $S=1$ and $S=5/2$ ferromagnet or $S=5/2$ antiferromagnet -- {\em except} for $S=1/2$ and $S=1$ antiferromagnet. We also investigate the stability of entangled antiferromagnetic GS upon suddenly coupling it to the bosonic bath.

One-dimensional Dexter-type excitonic topological phase transition. (arXiv:2305.18299v4 [cond-mat.mes-hall] UPDATED)
Jianhua Zhu, Ji Chen, Wei Wu

Recently topogical excitons have attracted much attention. However, studies on the topological properties of excitons in one dimension are still rare. Here we have computed the Zak phase for a generic one-dimensional dimerised excitonic model. Tuning relevant hopping parameters gives rise to a rich spectrum of physics, including non-trivial topological phase in uniform chain unlike the conventional Su-Shcrieffer-Heeger model, topologically nontrivial flat bands, and exotic fractional phase. a new concept of ``composite chiral site" was developed to interpret the Zak phase of $\pi$ in our calculations. Our finite-chain calculations substantiate topological edge states, providing more information about their characteristics. Most importantly, in the first time, a topological phase transition assisted by the Dexter electron exchange process has been found.

An open-source robust machine learning platform for real-time detection and classification of 2D material flakes. (arXiv:2306.14845v3 [cond-mat.mes-hall] UPDATED)
Jan-Lucas Uslu, Taoufiq Ouaj, David Tebbe, Alexey Nekrasov, Jo Henri Bertram, Marc Schütte, Kenji Watanabe, Takashi Taniguchi, Bernd Beschoten, Lutz Waldecker, Christoph Stampfer

The most widely used method for obtaining high-quality two-dimensional materials is through mechanical exfoliation of bulk crystals. Manual identification of suitable flakes from the resulting random distribution of crystal thicknesses and sizes on a substrate is a time-consuming, tedious task. Here, we present a platform for fully automated scanning, detection, and classification of two-dimensional materials, the source code of which we make openly available. Our platform is designed to be accurate, reliable, fast, and versatile in integrating new materials, making it suitable for everyday laboratory work. The implementation allows fully automated scanning and analysis of wafers with an average inference time of 100 ms for images of 2.3 Mpixels. The developed detection algorithm is based on a combination of the flakes' optical contrast toward the substrate and their geometric shape. We demonstrate that it is able to detect the majority of exfoliated flakes of various materials, with an average recall (AR50) between 67% and 89%. We also show that the algorithm can be trained with as few as five flakes of a given material, which we demonstrate for the examples of few-layer graphene, WSe$_2$, MoSe$_2$, CrI$_3$, 1T-TaS$_2$ and hexagonal BN. Our platform has been tested over a two-year period, during which more than $10^6$ images of multiple different materials were acquired by over 30 individual researchers.

Topological and nontopological degeneracies in generalized string-net models. (arXiv:2309.00343v3 [cond-mat.other] UPDATED)
Anna Ritz-Zwilling, Jean-Noël Fuchs, Steven H. Simon, Julien Vidal

Generalized string-net models have been recently proposed in order to enlarge the set of possible topological quantum phases emerging from the original string-net construction. In the present work, we do not consider vertex excitations and restrict to plaquette excitations, or fluxons, that satisfy important identities. We explain how to compute the energy-level degeneracies of the generalized string-net Hamiltonian associated to an arbitrary unitary fusion category. In contrast to the degeneracy of the ground state, which is purely topological, that of excited energy levels depends not only on the Drinfeld center of the category, but also on internal multiplicities obtained from the tube algebra defined from the category. For a noncommutative category, these internal multiplicities result in extra nontopological degeneracies. Our results are valid for any trivalent graph and any orientable surface. We illustrate our findings with nontrivial examples.

Electronic Phase Transformations and Energy Gap Variations in Uniaxial and Biaxial Strained Monolayer VS$_2$ TMDs: A Comprehensive DFT and Beyond-DFT Study. (arXiv:2309.08393v4 [cond-mat.mtrl-sci] UPDATED)
Oguzhan Orhan, Şener Özönder, Soner Ozgen

In the field of 2D materials, transition metal dichalcogenides (TMDs) are gaining attention for electronic applications. Our study delves into the H-phase monolayer VS$_2$ of the TMD family, analyzing its electronic structure and how strain affects its band structure using Density Functional Theory (DFT). Using a variety of computational methods, we provide an in-depth view of the electronic band structure. We find that strains between -5\% and +5\% significantly affect the energy gap, with uniaxial strains having a stronger effect than biaxial strains. Remarkably, compressive strains induce a phase shift from semiconducting to metallic, associated with symmetry breaking and changes in bond length. These findings not only deepen our understanding of the electronic nuances of monolayer VS$_2$ under varying strains but also suggest potential avenues for creating new electronic devices through strain engineering.

Spin Weyl Topological Insulators. (arXiv:2309.12470v2 [cond-mat.mtrl-sci] UPDATED)
Rafael Gonzalez-Hernandez, Bernardo Uribe

The quantum nature of electron spin is crucial for establishing topological invariants in real materials. Since the spin does not in general commute with the Hamiltonian, some of the topological features of the material can be extracted from its study. In insulating materials, the spin operator induces a projected operator on valence states called the spin valence operator. Its spectrum contains information with regard to the different phases of the spin Chern class. If the spin valence spectrum is gapped, the spin Chern numbers are constant along parallel planes thus defining spin Chern insulating materials. If the spin valence spectrum is not gapped, the changes in the spin Chern numbers occur whenever this spectrum is zero. Materials whose spin valence spectrum is gapless will be denoted spin Weyl topological insulators and their definition together with some of their properties will be presented in this work. The classification of materials from the properties of the spin valence operator provides a characterization that complements the existing list of topological invariants.

Deconfined Quantum Criticality in the long-range, anisotropic Heisenberg Chain. (arXiv:2311.06350v2 [cond-mat.str-el] UPDATED)
Anton Romen, Stefan Birnkammer, Michael Knap

Deconfined quantum criticality describes continuous phase transitions that are not captured by the Landau-Ginzburg paradigm. Here, we investigate deconfined quantum critical points in the long-range, anisotropic Heisenberg chain. With matrix product state simulations, we show that the model undergoes a continuous phase transition from a valence bond solid to an antiferromagnet. We extract the critical exponents of the transition and connect them to an effective field theory obtained from bosonization techniques. We show that beyond stabilizing the valance bond order, the long-range interactions are irrelevant and the transition is well described by a double frequency sine-Gordon model. We propose how to realize and probe deconfined quantum criticality in our model with trapped-ion quantum simulators.

Towards complete characterization of topological insulators and superconductors: A systematic construction of topological invariants based on Atiyah-Hirzebruch spectral sequence. (arXiv:2311.15814v2 [cond-mat.mes-hall] UPDATED)
Seishiro Ono, Ken Shiozaki

The past decade has witnessed significant progress in topological materials investigation. Symmetry-indicator theory and topological quantum chemistry provide an efficient scheme to diagnose topological phases from only partial information of wave functions without full knowledge of topological invariants, which has resulted in a recent comprehensive materials search. However, not all topological phases can be captured by this framework, and topological invariants are needed for a more refined diagnosis of topological phases. In this study, we present a systematic framework to construct topological invariants for a large part of symmetry classes, which should be contrasted with the existing invariants discovered through one-by-one approaches. Our method is based on the recently developed Atiyah-Hirzebruch spectral sequence in momentum space. As a demonstration, we construct topological invariants for time-reversal symmetric spinful superconductors with conventional pairing symmetries of all space groups, for which symmetry indicators are silent. We also validate that the obtained quantities work as topological invariants by computing them for randomly generated symmetric Hamiltonians. Remarkably, the constructed topological invariants completely characterize $K$-groups in 159 space groups. Our topological invariants for normal conducting phases are defined under some gauge conditions. To facilitate efficient numerical simulations, we discuss how to derive gauge-independent topological invariants from the gauge-fixed topological invariants through some examples. Combined with first-principles calculations, our results will help us discover topological materials that could be used in next-generation devices and pave the way for a more comprehensive topological materials database.

Giant piezoelectric effects of topological structures in stretched ferroelectric membranes. (arXiv:2401.05789v2 [cond-mat.mtrl-sci] UPDATED)
Yihao Hu, Jiyuan Yang, Shi Liu

Freestanding ferroelectric oxide membranes emerge as a promising platform for exploring the interplay between topological polar ordering and dipolar interactions that are continuously tunable by strain. Our investigations combining density functional theory (DFT) and deep-learning-assisted molecular dynamics simulations demonstrate that DFT-predicted strain-driven morphotropic phase boundary involving monoclinic phases manifest as diverse domain structures at room temperatures, featuring continuous distributions of dipole orientations and mobile domain walls. Detailed analysis of dynamic structures reveals that the enhanced piezoelectric response observed in stretched PbTiO$_3$ membranes results from small-angle rotations of dipoles at domain walls, distinct from conventional polarization rotation mechanism and adaptive phase theory inferred from static structures. We identify a ferroelectric topological structure, termed "dipole spiral," which exhibits a giant intrinsic piezoelectric response ($>$320 pC/N). This helical structure, primarily stabilized by entropy and possessing a rotational zero-energy mode, unlocks new possibilities for exploring chiral phonon dynamics and dipolar Dzyaloshinskii-Moriya-like interactions.

Found 10 papers in prb
Date of feed: Thu, 18 Jan 2024 04:17:07 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]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Gilbert damping for magnetic multilayers with perpendicular magnetic anisotropy
Yi Liu, Pengtao Yang, and Paul J. Kelly
Author(s): Yi Liu, Pengtao Yang, and Paul J. Kelly

A systematic, computational study of the Gilbert damping in $\mathrm{Co}|\mathrm{Ni}, \mathrm{Co}|\mathrm{Pd}$, and $\mathrm{Co}|\mathrm{Pt}$ multilayers is carried out using first-principles scattering calculations. The damping we find shows little temperature dependence and agrees well with experi…

[Phys. Rev. B 109, 014416] Published Wed Jan 17, 2024

Edge states of two-dimensional time-reversal invariant topological superconductors with strong interactions and disorder: A view from the lattice
Jun Ho Son, Jason Alicea, and Olexei I. Motrunich
Author(s): Jun Ho Son, Jason Alicea, and Olexei I. Motrunich

Two-dimensional time-reversal-invariant topological superconductors host helical Majorana fermions at their boundary. We study the fate of these edge states under the combined influence of strong interactions and disorder, using the effective one-dimensional (1D) lattice model for the edge introduce…

[Phys. Rev. B 109, 035138] Published Wed Jan 17, 2024

Graph theorem for chiral exact flat bands at charge neutrality
Gurjyot Sethi, Bowen Xia, Dongwook Kim, Hang Liu, Xiaoyin Li, and Feng Liu
Author(s): Gurjyot Sethi, Bowen Xia, Dongwook Kim, Hang Liu, Xiaoyin Li, and Feng Liu

Chiral exact flat bands (FBs) at charge neutrality have attracted much recent interest, presenting an intriguing condensed-matter system to realize exotic many-body phenomena, as specifically shown in magic-angle twisted bilayer graphene for superconductivity and triangulene-based superatomic graphe…

[Phys. Rev. B 109, 035140] Published Wed Jan 17, 2024

Tight-binding model with sublattice-asymmetric spin-orbit coupling for square-net nodal line Dirac semimetals
Gustavo S. Orozco-Galvan, Amador García-Fuente, and Salvador Barraza-Lopez
Author(s): Gustavo S. Orozco-Galvan, Amador García-Fuente, and Salvador Barraza-Lopez

We study a four-orbital tight-binding model for ZrSiS from the square sublattice generated by the Si atoms. After studying three other alternatives, we endow this model with a new effective spin-orbit coupling (SOC) consistent with ab initio dispersions around the Fermi energy ${E}_{F}$ in four syst…

[Phys. Rev. B 109, 035141] Published Wed Jan 17, 2024

Pressure-induced switching between topological phases in magnetic van der Waals heterostructures
Jie Li, Peiru Yang, Wei Ren, and Ruqian Wu
Author(s): Jie Li, Peiru Yang, Wei Ren, and Ruqian Wu

Despite the significant developments in quantum anomalous Hall (QAH) insulators study in recent years, it remains an outstanding challenge to tune between different topological phases in the same material. In this work, an ultrathin van der Waals (vdW) heterostructure based on $\mathrm{Mn}{\mathrm{B…

[Phys. Rev. B 109, 035419] Published Wed Jan 17, 2024

Convergent thermal conductivity in strained monolayer graphene
Guotai Li, Jialin Tang, Jiongzhi Zheng, Qi Wang, Zheng Cui, Ke Xu, Jianbin Xu, Te-Huan Liu, Guimei Zhu, Ruiqiang Guo, and Baowen Li
Author(s): Guotai Li, Jialin Tang, Jiongzhi Zheng, Qi Wang, Zheng Cui, Ke Xu, Jianbin Xu, Te-Huan Liu, Guimei Zhu, Ruiqiang Guo, and Baowen Li

The strain dependence of thermal conductivity (κ) in monolayer graphene, with reports of enhancement, suppression, or even divergence, has been highly controversial. To address this open question, we have systematically investigated the effects of tensile strain on the κ of graphene using the exact …

[Phys. Rev. B 109, 035420] Published Wed Jan 17, 2024

Conductance based machine learning of optimal gate voltages for disordered Majorana wires
Matthias Thamm and Bernd Rosenow
Author(s): Matthias Thamm and Bernd Rosenow

Majorana zero modes in superconductor-nanowire hybrid structures are a promising candidate for topologically protected qubits with the potential to be used in scalable structures. Currently, disorder in such Majorana wires is a major challenge, as it can destroy the topological phase and thus reduce…

[Phys. Rev. B 109, 045132] Published Wed Jan 17, 2024

Enhancement of high-order harmonic generation in graphene by mid-infrared and terahertz fields
Wenwen Mao, Angel Rubio, and Shunsuke A. Sato
Author(s): Wenwen Mao, Angel Rubio, and Shunsuke A. Sato

We theoretically investigate high-order harmonic generation (HHG) in graphene under mid-infrared (MIR) and terahertz (THz) fields based on a quantum master equation. Numerical simulations show that MIR-induced HHG in graphene can be enhanced by a factor of 10 for fifth harmonic and a factor of 25 fo…

[Phys. Rev. B 109, 045421] Published Wed Jan 17, 2024

Spin character of interlayer excitons in tungsten dichalcogenide heterostructures: GW-BSE calculations
Yaning Li, Zhihui Yan, and Shudong Wang
Author(s): Yaning Li, Zhihui Yan, and Shudong Wang

Interlayer excitons (IXs) have become an ideal platform for studying exciton condensation, single-photon emission, and other quantum phenomena. Two-dimensional transition metal dichalcogenide (TMD) heterostructures, with type-II band alignment features, provide a simple framework for the formation o…

[Phys. Rev. B 109, 045422] Published Wed Jan 17, 2024

Electrically tuned topology and magnetism in twisted bilayer ${\mathrm{MoTe}}_{2}$ at ${ν}_{h}=1$
Bohao Li, Wen-Xuan Qiu, and Fengcheng Wu
Author(s): Bohao Li, Wen-Xuan Qiu, and Fengcheng Wu

We present a theoretical study of an interaction-driven quantum phase diagram of twisted bilayer ${\mathrm{MoTe}}_{2}$ at hole filling factor ${ν}_{h}=1$ as a function of twist angle $θ$ and layer potential difference ${V}_{z}$, where ${V}_{z}$ is generated by an applied out-of-plane electric field.…

[Phys. Rev. B 109, L041106] Published Wed Jan 17, 2024

Found 4 papers in prl
Date of feed: Thu, 18 Jan 2024 04:17:04 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)

Photonic Topological Spin Pump in Synthetic Frequency Dimensions
Joseph Suh, Gyunghun Kim, Hyungchul Park, Shanhui Fan, Namkyoo Park, and Sunkyu Yu
Author(s): Joseph Suh, Gyunghun Kim, Hyungchul Park, Shanhui Fan, Namkyoo Park, and Sunkyu Yu

Reducing geometrical complexity while preserving desired wave properties is critical for proof-of-concept studies in wave physics, as evidenced by recent efforts to realize photonic synthetic dimensions, isospectrality, and hyperbolic lattices. Laughlin’s topological pump, which elucidates quantum H…

[Phys. Rev. Lett. 132, 033803] Published Wed Jan 17, 2024

Fractional Chern Insulator in Twisted Bilayer ${\mathrm{MoTe}}_{2}$
Chong Wang, Xiao-Wei Zhang, Xiaoyu Liu, Yuchi He, Xiaodong Xu, Ying Ran, Ting Cao, and Di Xiao
Author(s): Chong Wang, Xiao-Wei Zhang, Xiaoyu Liu, Yuchi He, Xiaodong Xu, Ying Ran, Ting Cao, and Di Xiao

A recent experiment has reported the first observation of a zero-field fractional Chern insulator (FCI) phase in twisted bilayer ${\mathrm{MoTe}}_{2}$ moiré superlattices [J. Cai et al., Signatures of fractional quantum anomalous Hall states in twisted ${\mathrm{MoTe}}_{2}$, Nature (London) 622, 63…

[Phys. Rev. Lett. 132, 036501] Published Wed Jan 17, 2024

Dynamical Detection of Topological Spectral Density
Jia-Hui Zhang, Feng Mei, Liantuan Xiao, and Suotang Jia
Author(s): Jia-Hui Zhang, Feng Mei, Liantuan Xiao, and Suotang Jia

Local density of states (LDOS) is emerging as powerful means of exploring classical-wave topological phases. However, the current LDOS detection method remains rare and merely works for static situations. Here, we introduce a generic dynamical method to detect both the static and Floquet LDOS, based…

[Phys. Rev. Lett. 132, 036603] Published Wed Jan 17, 2024

Symmetry Breaking of Self-Propelled Topological Defects in Thin-Film Active Chiral Nematics
Weiqiang Wang, Haijie Ren, and Rui Zhang
Author(s): Weiqiang Wang, Haijie Ren, and Rui Zhang

Active nematics represent a range of dense active matter systems which can engender spontaneous flows and self-propelled topological defects. Two-dimensional (2D) active nematic theory and simulation have been successful in explaining many quasi-2D experiments in which self-propelled $+1/2$ defects …

[Phys. Rev. Lett. 132, 038301] Published Wed Jan 17, 2024

Found 1 papers in pr_res
Date of feed: Thu, 18 Jan 2024 04:17:04 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)

Screw dislocation dynamics in confinement-induced layering of Yukawa liquids after quenching
Yun-Xuan Zhang, Hao-Wei Hu, Yi-Cheng Zhao, and Lin I
Author(s): Yun-Xuan Zhang, Hao-Wei Hu, Yi-Cheng Zhao, and Lin I

A new perspective from fluctuating screw dislocation filaments (SDFs) winded around by helical layering fronts is provided to reveal the transient dynamics of tightly confined liquids after quenching. The uncovered topological origins for the spontaneous formation, interaction, breaking, reconnection, and loop merging and shedding of SDFs can be extended to various systems with unstable layers or wave fronts.

[Phys. Rev. Research 6, L012012] Published Wed Jan 17, 2024

Found 1 papers in nano-lett
Date of feed: Wed, 17 Jan 2024 14:07:06 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)

[ASAP] Toward the Ultimate Limit of Analyte Detection, in Graphene-Based Field-Effect Transistors
Alex W. Lee, Yongliang Dong, Shreyam Natani, Deependra Kumar Ban, and Prabhakar R. Bandaru

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.3c04066

Found 2 papers in acs-nano
Date of feed: Wed, 17 Jan 2024 14:04:36 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] Nanoscrolls of Janus Monolayer Transition Metal Dichalcogenides
Masahiko Kaneda, Wenjin Zhang, Zheng Liu, Yanlin Gao, Mina Maruyama, Yusuke Nakanishi, Hiroshi Nakajo, Soma Aoki, Kota Honda, Tomoya Ogawa, Kazuki Hashimoto, Takahiko Endo, Kohei Aso, Tongmin Chen, Yoshifumi Oshima, Yukiko Yamada-Takamura, Yasufumi Takahashi, Susumu Okada, Toshiaki Kato, and Yasumitsu Miyata

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c05681

[ASAP] Photo-oxidative Crack Propagation in Transition Metal Dichalcogenides
Andrew Ben-Smith, Soo Ho Choi, Stephen Boandoh, Byung Hoon Lee, Duc Anh Vu, Huong Thi Thanh Nguyen, Laud Anim Adofo, Jeong Won Jin, Soo Min Kim, Young Hee Lee, and Ki Kang Kim

TOC Graphic

ACS Nano
DOI: 10.1021/acsnano.3c08755

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)

Reconfiguring nucleation for CVD growth of twisted bilayer MoS2 with a wide range of twist angles
< author missing >

Found 1 papers in comm-phys

Search terms: (topolog[a-z]+)|(graphit[a-z]+)|(rhombohedr[a-z]+)|(graphe[a-z]+)|(chalcog[a-z]+)|(landau)|(weyl)|(dirac)|(STM)|(scan[a-z]+ tunne[a-z]+ micr[a-z]+)|(scan[a-z]+ tunne[a-z]+ spectr[a-z]+)|(scan[a-z]+ prob[a-z]+ micr[a-z]+)|(MoS.+\d+|MoS\d+)|(MoSe.+\d+|MoSe\d+)|(MoTe.+\d+|MoTe\d+)|(WS.+\d+|WS\d+)|(WSe.+\d+|WSe\d+)|(WTe.+\d+|WTe\d+)|(Bi\d+Rh\d+I\d+|Bi.+\d+.+Rh.+\d+.+I.+\d+.+)|(BiTeI)|(BiTeBr)|(BiTeCl)|(ZrTe5|ZrTe.+5)|(Pt2HgSe3|Pt.+2HgSe.+3)|(jacuting[a-z]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Metasurface-based perfect vortex beam for optical eraser
Shao-Yang Huang

Communications Physics, Published online: 17 January 2024; doi:10.1038/s42005-024-01525-9

In this work, metasurface-based perfect vortex beams (MPVBs) featuring topological charges (TCs) of −32 and 16 have been successfully manufactured. As one of the tremendous phenomena in quantum mechanics, the fancy optical eraser experiment by integrating these MPVBs has also been successfully demonstrated in this study.

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]+)|(flatband)|(flat.{1}band)|(LK.{1}99)

Comparative Analysis of Tight-Binding models for Transition Metal Dichalcogenides, by Bert Jorissen, Lucian Covaci, Bart Partoens
< author missing >
Submitted on 2024-01-17, refereeing deadline 2024-01-31.