A5045811285- Topological Materials and Phenomena
- Quantum Mechanics and Non-Hermitian Physics
- Graphene research and applications
- Metamaterials and Metasurfaces Applications
- Nonlinear Photonic Systems
- Quantum optics and atomic interactions
- Photonic Crystals and Applications
- Spectral Theory in Mathematical Physics
- Geophysical Methods and Applications
- Quantum many-body systems
- Acoustic Wave Phenomena Research
- Advanced Condensed Matter Physics
Wuhan University
2022-2024
Higher-order topological phases have raised widespread interest in recent years with the occurrence of boundary states dimension two or more less than that system bulk. The higher-order been verified gapped phases, a wide variety systems, such as photonic and acoustic recently also observed gapless semimetal phase, Weyl Dirac systems alike. topology is signaled by hinge emerging common band gaps bulk surface states. In this Letter, we report our first prediction observation new type states,...
Higher-order topological insulators and semimetals, which generalize the conventional bulk-boundary correspondence, have attracted extensive research interest. Among them, higher-order Weyl semimetals feature twofold linear crossing points in three-dimensional momentum space, 2D Fermi-arc surface states, 1D hinge states. nodal-point possessing or Dirac been implemented. However, nodal-line nodal-surface remain to be further explored experiments spite of many previous theoretical efforts. In...
Nodal lines are symmetry-protected one-dimensional band degeneracies in momentum space, which can appear numerous topological configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian physics have been proposed space-time inversion (PT) symmetric systems. One of the most special systems is earring link, composing a chain linking with an isolated line. Such links not observed real We designed phononic crystals experimentally two different kinds by measuring...
The study of topological states has become an important topic in both solid-state systems and artificial structures such as photonic crystals phononic crystals. Among them, Majorana zero modes, which exhibit nontrivial braiding process, have attracted extensive research interest. analog modes classical waves, or the Majorana-like (MLZMs), also got a lot attention recently. However, vast majority previous works concerned with MLZMs that were bounded to vortexes inside bulk. Here this work, we...
The robust transport of edge modes is perhaps the most useful property topological materials. existence guaranteed by bulk-edge correspondence, which states that number determined bulk invariants. To obtain on edge, we need to make volumetric changes many atoms control properties a few in lower dimension. We suggest here can do reverse some cases: guarantee chiral phenomena modes, achieving are essentially same as those observed valley-Hall systems. Specifically, show topologically trivial...
Abstract Topological pumps enable robust transports of topological states when the system parameters are varied in a cyclic process. The reported protected by bulk topology. However, exploration pump other mechanism remains elusive. Here we report our prediction and observation higher-order linked to boundary topology, i.e., Chern number. Based on such pump, between different dimensions (e.g., corner-edge-corner) directly observed spatial scanning sound field, their robustness is paths with...
Quadrupolar topological semimetals with a bulk quadrupole moment have been intensively investigated recently. Of special interest is the quadrupolar surface semimetal, which has gapped but Dirac nodes attached to each other by hinge states. However, this novel state remains be observed in condensed matter. Here, we implement semimetal acoustic crystals. By tuning symmetry of structure, states at specific can engineered, thus allowing coexistence different dispersions single system. The and...
Since the discovery of Weyl fermion in material $\mathrm{Ta}\mathrm{As}$, searching for new types (quasi)particles universe condensed matter and materials, beyond those captured real universe, has aroused tremendous interest. More recently, an exotic excitation, linear dispersion up to sixfold degeneracy, been predicted theoretically a three-dimensional material, which harbors hinge arc states on boundary thus manifesting nontrivial higher-order topology. The excitations, with maximal...
Higher-order topological insulators and semimetals, which generalize the conventional bulk-boundary correspondence, have attracted extensive research interest. Among them, higher-order Weyl semimetals feature two-fold linear crossing points in three-dimensional (3D) momentum space, 2D Fermi-arc surface states, 1D hinge states. nodal-point possessing or Dirac been implemented. However, nodal-line nodal-surface remain to be further explored experiments spite of many previous theoretical...