Observation of a $p$-orbital higher-order topological insulator phase in puckered lattice acoustic metamaterials

Bing-Quan Wu, Zhi-Kang Lin, Li-Wei Wang +1

The puckered lattice geometry, along with $p$-orbitals is often overlooked in the study of topological physics. Here, we investigate the higher-order topology of the $p_{x,y}$-orbi…