A5084762702- Topological Materials and Phenomena
- Graphene research and applications
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Quantum many-body systems
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- 2D Materials and Applications
- Rare-earth and actinide compounds
- Sports Performance and Training
- Sports injuries and prevention
- Metamaterials and Metasurfaces Applications
- Urban Transport and Accessibility
- Physical Activity and Health
- Atomic and Subatomic Physics Research
- Urban Green Space and Health
- Lower Extremity Biomechanics and Pathologies
- Nutrition and Health in Aging
- Noncommutative and Quantum Gravity Theories
- Plasmonic and Surface Plasmon Research
- Spectral Theory in Mathematical Physics
- Antenna Design and Analysis
- Quantum optics and atomic interactions
- Health disparities and outcomes
- Magnetic properties of thin films
Ningbo University
2017-2025
China Jiliang University
2020-2025
University of Maryland, College Park
2021-2024
Princeton University
2008-2024
University of Florida
2024
Joint Quantum Institute
2021-2023
Pennsylvania State University
2017-2021
Beijing Technology and Business University
2016
Shanghai University of Sport
2015
Fractionally filled Chern bands with strong interactions may give rise to fractional insulator (FCI) states, the zero-field analog of quantum Hall effect. Recent experiments have demonstrated existence FCIs in twisted bilayer ${\mathrm{MoTe}}_{2}$ without external magnetic fields---most robust at $\ensuremath{\nu}=\ensuremath{-}2/3$---as well as insulators (CIs) $\ensuremath{\nu}=\ensuremath{-}1$. Although appearance both these states is theoretically natural an interacting topological...
The researchers here shed new light on the elusive single-particle model of twisted bilayer MoTe${}_{2}$, a material recently highlighted for hosting fractional Chern insulators at zero magnetic field. By leveraging an advanced machine learning method and density functional theory, team meticulously maps out band structure across various twist angles, revealing pivotal inversion refining theoretical landscape. enhancing continuum with higher harmonic terms, they unveil opposite numbers in...
The observation of fractional Chern insulators in rhombohedral pentalayer graphene twisted on hexagonal boron nitride has initiated a flurry theoretical work seeking its explanation. As step towards understanding the origin these phases, authors undertake here first-principles study large family multilayer graphene/boron superlattices, including structural relaxation. moir\'e models they obtain faithfully capture microscopic band structure and are starting point for observed topological...
We predict the existence of triple point fermions in band structure several half-Heusler topological insulators by ab initio calculations and Kane model. find that many compounds exhibit multiple points along four independent C_{3} axes, through which doubly degenerate conduction bands nondegenerate valence cross each other linearly nearby Fermi energy. When projected from bulk to (111) surface, most these are located far away surface Γ[over ¯] point, as distinct previously reported fermion...
A topological heavy-fermion (THF) model is formulated for magical-angle twisted symmetric trilayer graphene (MATSTG), where ``symmetric'' means that the top and bottom layers are rotated equally with respect to middle layer. In addition localized $f$ modes itinerant $c$ (which serve as basis of THF bilayer graphene), MATSTG consists extra Dirac ($d$) modes. The newly proposed $f\ensuremath{-}c\ensuremath{-}d$ can well reproduce previous numerical results on correlated phases at integer...
Doped lead apatite (LK-99) has been proposed as a candidate ambient temperature and pressure superconductor, dramatic claim requiring careful investigation from experiment theory. Here, the authors synthesize an LK-99 sample find multiphase, transparent material that does not support high-temperature superconductivity. This is in agreement with $a\phantom{\rule{0}{0ex}}b$...
Hamstring strain injury is one of most prevalent noncontact injuries in sports that involve high-speed running, such as sprinting, soccer, and rugby. 1 In order to optimize prevention strategies rehabilitation, studies have been conducted understand hamstring function during sprinting. 2-4However, differences long existed the literature cause injuries.One controversial topics debate over which phase running associated with injuries. 5tudies biomechanics indicate hamstrings are active for...
In this paper, we present a novel tunable graphene coding metasurface structure using circular patch on an uneven substrate. By changing the Fermi level of or thickness substrate, can achieve obvious phase variation. Firstly, put forward two construction methods 1-bit based mechanism. The first method is to change substrate when levels two-unit cells are same, so that exhibit different digital states '0' and '1'. Furthermore, working frequency band in real-time by switching from 0.05 eV 0.85...
Various exotic topological phases of Floquet systems have been shown to arise from crystalline symmetries. Yet, a general theory for topology that is applicable all symmetry groups still in need. In this work, we propose such (effectively) non-interacting crystals. We first introduce quotient winding data classify the dynamics crystals with equivalent data, and then construct dynamical indicators (DSIs) sufficiently indicate inherently The DSI as well are computationally efficient since they...
Signatures of nematic nodal superconductivity have been experimentally observed in magic angle twisted bilayer graphene (MATBG). Here, we propose a general topological mechanism explaining how pairing leads to MATBG. By focusing on the intervalley ${C}_{2z}\mathcal{T}$-invariant Cooper order parameter, show that parameter can always be split into trivial channel and an Euler obstructed channel, owing nontrivial normal-state band topology. When is spontaneously nematic, find...
In this work, we construct a generalized Kane model with coupling term between itinerant electron spins and local magnetic moments of antiferromagnetic ordering in order to describe the low-energy effective physics large family half-Heusler materials. The topological properties are studied variety phases, including Dirac semimetal phase, Weyl nodal line type-B triple point mirror (or glide) insulating identified different parameter regions our models. particular, find that system is always...
In noncentrosymmetric superconductors, spin-orbit coupling can induce an unconventional superconducting state with a mixture of $s$-wave spin-singlet and $p$-wave spin-triplet channels. It is commonly thought that inversion symmetry breaking substantial for mixed-pairing states. this paper, we theoretically propose new type state, namely the $d$-wave spin-quintet channels, occur even in presence when electrons effectively carry ``spin-3/2.'' As physical consequence singlet-quintet pairing...
Abstract Recent years have witnessed tremendous success in the discovery of topological states matter. Particularly, sophisticated theoretical methods time-reversal-invariant phases been developed, leading to comprehensive search crystal database and prediction thousands materials. In contrast, magnetic that break time reversal is still limited several exemplary materials because coexistence magnetism electronic band structure rare a single compound. To overcome this challenge, we propose an...
Finding new physical responses that signal topological quantum phase transitions is of both theoretical and experimental importance. Here, we demonstrate the piezoelectric response can change discontinuously across a transition in two-dimensional time-reversal invariant systems with spin-orbit coupling, thus serving as direct probe transition. We study all gap closing cases for 7 plane groups allow non-vanishing piezoelectricity find any 1 fine-tuning parameter between two gapped states...
In two-dimensional insulators with time-reversal (TR) symmetry, a nonzero local Berry curvature of low-energy massive Dirac fermions can give rise to nontrivial spin and charge responses, even though the integral over all occupied states is zero. this Letter, we present new effect induced by electronic curvature. By studying electron-phonon interactions in ${\mathrm{BaMnSb}}_{2}$, prototype material possessing two TR-related cones, find that electrons induce phonon angular momentum. The...
Since the proposal of monopole Cooper pairing by Li and Haldane [Phys. Rev. Lett. 120, 067003 (2018)], considerable research efforts have been dedicated to study order parameters constrained (or obstructed) nontrivial normal-state band topology at Fermi surfaces in 3D systems. In current work, we generalize topologically obstructed pairings between Chern states (like pairing) proposing Euler The widely exists two with characterized nonzero numbers; such can exist...
This study examined the separate and combined associations of obesity handgrip strength with cognitive function in older adults. In total 4,839 adults were included this cross-sectional study, their body mass index (BMI) measured. Cognitive was evaluated using Telephone Interview for Status. Three individual categories created BMI (normal weight: 18.5≤ < 24.0 kg/m2 overweight: 24.0≤ 28.0 obesity: ≥ (low, normal, high tertiles), then these pooled together. Logistic regression analyses used to...
A quantized version of the magnetoelectric effect, known as topological can exist in a time-reversal invariant insulator with all its surface states gapped out by magnetism. This phase, called axion has been theoretically proposed but still lacks conclusive experimental evidence due to small signal effect. In this work, we propose that dynamical in-plane magnetization an generate pseudoelectric field, which acts on state films and leads nonzero response current. Strikingly, find current at...
Topologically trivial insulators are classified into two primary categories: unobstructed and obstructed atomic insulators. While both types can be described by exponentially localized Wannier orbitals, a defining feature of is that the centers charge these orbitals positioned at empty sites within unit cell, rather than on atoms. Despite extensive theoretical predictions, unambiguous quantitative experimental identification an phase has remained elusive. In this work, we present first...