We propose theoretically (Phys. Rev. Lett. 125, 146401 (2020) Web link) and observe experimentally higher-order Weyl semimetals. The experiment is achieved via a home-designed sonic crystal. The main feature of higher-order Weyl semimetal is the coexistence of Fermi arc surface states and the hinge-arc states connecting the higher-order Weyl points. Nat...

We discover experimentally second-order topological insulating phases and multidimensional topological transitions (in both bulk and edges) in sonic crystals. The higher-order topology and multidimensional transitions are triggered by tuning the geometry of the unit-cells of the sonic crystals. Nature Physics 15, 582-588 (2019) Link to the p...

We were invited by the EIC of Europhys. Lett. for a Perspective paper on higher-order topological insulators. We wrote on the relation between Dirac cones and higher-order topological phases in quasi-continuous media (i.e., photonic and acoustic crystals). The paper entitled with "Dirac cones and higher-order topology in quasi-continuous media" (https://ar...

Abstract Gauge fields play a major role in understanding quantum effects. For example, gauge flux insertion into single unit cells is crucial towards detecting quantum phases and controlling quantum dynamics and classical waves. However, the potential of gauge fields in topological materials studies has not been fully exploited. Here, we experimentally...

Jincheng and Rongqian got married! Congratulations to them! 

Abstract Topological phases of matter connect mathematical principles to real materials, and may shape future electronic and quantum technologies. So far, this discipline has mostly focused on single-gap topology described by topological invariants such as Chern numbers. Here, based on a tunable kagome model, we observe non-Abelian band topology and it...

Abstract Most natural and artificial materials have crystalline structures from which abundant topological phases emerge 1, 2, 3, 4, 5, 6. However, the bulk-edge correspondence -- which has been widely used in experiments to determine the band topology from edge properties -- is inadequate in discerning various topological crystalline phases 7, 8, ...

Prof. Jian-Hua Jiang was awarded the NSFC distinguished young scientist funding (4 million RMB). Congratulations!