A5000485170- Topological Materials and Phenomena
- Graphene research and applications
- 2D Materials and Applications
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Photonic Crystals and Applications
- Advanced Thermoelectric Materials and Devices
- Advanced Condensed Matter Physics
- Random lasers and scattering media
- Physics of Superconductivity and Magnetism
- Metamaterials and Metasurfaces Applications
- Quantum Mechanics and Non-Hermitian Physics
Beijing Institute of Technology
2023-2024
Inner Mongolia University
2023-2024
The anomalous Hall effect (AHE), a protocol of various low-power dissipation quantum phenomena and fundamental precursor intriguing topological phases matter, is usually observed in ferromagnetic materials with an orthogonal configuration between the electric field, magnetization, current. Here, based on symmetry analysis, we find unconventional AHE induced by in-plane magnetic field (IPAHE) via spin-canting $\mathcal{PT}$-symmetric antiferromagnetic (AFM) systems, featuring linear...
Nowadays, it is recognized that semiconductors are prospective candidates for promising thermoelectric materials and the gapless topological phonon modes can result in a high scattering rate. Therefore necessary to identify phonons semiconductors, which will aid future research aimed at gaining better understanding of properties semiconductors. Using first-principles calculations symmetry analysis, we propose series as excellent presence exotic phonons. Remarkably, almost all types phonons,...
Higher-order topological insulators (HOTIs), that are classified as obstructed atomic (OAIs) in the quantum chemistry (TQC) theory, attract great interest owning to lower-dimensional boundary states. However, states HOTIs reported so far often fragile, manifested strongly depending on crystalline symmetries and cleavage terminations disk or cylinder geometry. Here, using TQC we propose an intuitive strategy establish connection between Wannier charge centers of OAIs emergence robust corner...
Magnetic topological materials exhibiting unique quantum physics due to the combination of spintronics and topology have aroused interest researchers. We propose $P{6}_{3}22$-type ${\mathrm{BaNiIO}}_{6}$---a dynamically stable material with two fully spin-polarized hourglass charge-three (C-3) Weyl points (WPs) six charge-one (C-1) WPs around Fermi level---with help first-principles calculations symmetry analysis. C-3 been theoretically proposed for more than a decade. However, they only...
Novel fermions with relativistic linear dispersion can emerge as low-energy excitations in topological semimetal materials.Here, we show that the orbital moment contribution circular photomagnetic effect for these semimetals exhibit an unconventional ω -1 frequency scaling, leading to significantly enhanced response low window, which be orders of magnitude larger than previous observations on conventional materials.Furthermore, tensor is directly connected Chern numbers emergent fermions,...
Traditional electronic devices rely on the electron's intrinsic degrees of freedom (d.o.f.) to process information. However, additional d.o.f., like valley, can emerge in low-energy states certain systems. Here, we show that quantum dots constructed from two-dimensional second-order topological insulators posses a new kind namely corner freedom, related reside at different corners Since are well separated real space, they be individually and intuitively manipulated, giving rise concept...
Abstract Three-dimensional Dirac semimetals with square-net non-symmorphic symmetry, such as ternary ZrXY (X = Si, Ge; Y S, Se, Te) compounds, have attracted significant attention owing to the presence of topological nodal lines, loops, or networks in their bulk. Orbital symmetry plays a profound role materials different branches dispersion can be distinguished by distinct orbital eigenvalues. The eigenvalues suggests that scattering between states may strongly suppressed. Indeed, ZrSiS,...
When topology meets chirality, it is of great interest to search for possible topological properties in chiral crystals, thereby achieving the effect making $1+1$ greater than 2. Here, we accomplish a complete list charge-2 (C-2) Dirac fermions based on 65 S\"ohncke space groups. Such emergent occurring crystals enjoy higher charge number and exhibit more unique characteristics compared C-0 cases, including multiple Fermi arcs extending most Brillouin zone. For material realization, propose...
3D Dirac semimetals with square-net non-symmorphic symmetry, such as ternary ZrXY (X=Si, Ge; Y=S, Se, Te) compounds, have attracted significant attention owing to the presence of topological nodal lines, loops, or networks in their bulk. Orbital symmetry plays a profound role materials different branches dispersion can be distinguished by distinct orbital eigenvalues. The eigenvalues suggests that scattering between states may strongly suppressed. Indeed, ZrSiS, there has been no clear...
According to the theory of group representations, types band degeneracy can be divided into accidental and essential degeneracy. The essentially degenerate nodal lines (NLs) are typically resided on high-symmetry Brillouin zone. Here, we propose a type NL in two dimension that is but hidden within planes, making it less observable, dubbed hidden-essential line (HENL). existence HENL guaranteed as long system hosts horizontal glide-mirror symmetry, hence such NLs widely found both...
Three-dimensional nodal-line semimetals (NLSMs) are of remarkable importance for both enriching topological physics and wave management. However, NLSMs realized in acoustic systems twofold band degenerate called Weyl NLSMs. Here, we report on the experimental observation Dirac with fourfold degeneracy sonic crystals. We reveal that properties entirely different than those conventional The Berry phase related to nodal line (DNL) is $2\ensuremath{\pi}$, which results surface responses two...