A5101388519- Topological Materials and Phenomena
- Graphene research and applications
- 2D Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
- Advanced Condensed Matter Physics
- Quantum Mechanics and Non-Hermitian Physics
- Quantum Information and Cryptography
- Physics of Superconductivity and Magnetism
- MXene and MAX Phase Materials
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Perovskite Materials and Applications
- Quantum chaos and dynamical systems
Tsinghua University
2023-2025
State Key Laboratory of Low-Dimensional Quantum Physics
2025
Peking University
2025
ZrTe_{5} has recently attracted much attention due to the observation of intriguing nonreciprocal transport responses which necessitate lack inversion symmetry (I). However, there been debate on exact I-asymmetric structure and underlying I-breaking mechanism. Here, we report a spontaneous I breaking in films, initiates from interlayer sliding is stabilized by subtle intralayer distortion. Moreover, predict significant nonlinear anomalous Hall effect (NAHE) kinetic magnetoelectric (KME), are...
Achieving multiple switchable polarization states at the nanoscale is crucial to high-density nonvolatile multistate memory beyond bistable ferroelectric architectures. Here, we propose a novel strategy realize and enhance nonreciprocal transport in two-dimensional (2D) van der Waals heterostructures. By integrating two distinct 2D materials with substantial spontaneous polarizations, demonstrate that Bi/SnTe heterostructure can support up eight states. Our first-principles analysis of...
Abstract The Berry curvature dipole (BCD) and the resulting nonlinear Hall effect have been investigated in various time‐reversal (TR) invariant but inversion‐breaking materials, where primary mechanisms are typically attributed to low‐energy Dirac models with tilt, Fermi surface (FS) warping, or semi‐Dirac dispersion quadratic momentum dependence one direction. This study proposes that a nonzero BCD arises special type‐II model formed by merging of three conventional points absence TR...
Two-dimensional (2D) second-order topological insulators (SOTIs) have been extensively studied due to their unique feature of fractional charge at corners. In order realize such kind SOTI in natural materials, we reveal a class experimentally synthesized 1T-phase transition metal dichalcogenides (TMDs) monolayers as candidates SOTI. Taking the monolayer 1T-${\mathrm{PtSe}}_{2}$ an example, identify its topology by determining nonzero corner using first-principles calculations and symmetry...
Topological semimetals in chiral crystals, which possess both structural handedness and band crossings (or nodes) with topological charge, exhibit many exotic physical properties. Here we demonstrate that the electronic chirality of these systems can endow them another fascinating phenomenon -- intrinsic nonlinear planar Hall effect (INPHE), is prominent around nodes reverses sign upon reversal opposite enantiomers. Taking tellurium as an example, reveal orbital mechanism, manifests...
A generalization of the nested Wilson loop formalism, which has been instrumental in studying topological quadrupole insulators, is presented. This formalism extended to nonsymmorphic materials with higher-order topology. In three-dimensional Dirac semimetals, generalized Berry phase derived from this acts as a bulk indicator, determining presence or absence Fermi arcs. reveals direct correspondence between and hinges.
The transport of Bloch electrons under strong fields is traditionally understood through two mechanisms: intraband oscillations and interband Zener tunneling. Here we propose a new oscillation mechanism induced by the quantum metric, which would significantly affect electron dynamics fields. By considering multiband to second order density matrix, reveal that metric-induced (QMO) persist regardless band dispersion, even in exactly flat bands. resultant drift current can reach magnitude...
We generalize the nested Wilson loop formalism, which has been playing an important role in study of topological quadrupole insulators, to two-dimensional (2D) and 3D nonsymmorphic materials with higher-order topology. In particular, certain Dirac semimetals exhibit 1D Fermi arc (HOFA) states localizing on hinges where two surfaces meet connecting projection bulk points. discover that generalized Berry phase (gNBP) derived from this formalism is indicator determining existence/absence HOFAs,...