In-Plane Second-Order Topologically Protected States in Elastic Kagome Lattices

• DOI: 10.1103/physrevapplied.14.014084
• Publication Date: 2020-07-28T18:44:05Z
• Authors: Qian Wu; Hui Chen; Xiaopeng Li; Guoliang Huang
• Keywords: Topological insulator; Lattice (music); Elasticity

Second-order topological insulators, which exhibit capability of hosting topologically protected zero-dimensional corner states distinct from the well-studied edge states, unveil a horizon beyond conventional bulk-edge correspondence. Motivated by recent experimental observation Wannier-type second-order in acoustic structures, we investigate numerically and demonstrate experimentally in-plane mechanical kagome lattice. By manipulating simply lattice geometry quantized characterization, exploit that emerging are robust against disorders. We further present insulator with multi-interfaces such energy can be localized multiple locations, provides possibility practical application harvesting devices. The study is physical to extend elastic dynamics, modal coupling elasticity makes it more challenging measured experimentally.