Higher‐Order Topological States in Thermal Diffusion

• DOI: 10.1002/adma.202210825
• Publication Date: 2023-02-02T18:43:04Z
• Authors: Haotian Wu; Hao Hu; Xixi Wang; Zhixia Xu; Baile Zhang; Qi Jie Wang; Yuanjin Zheng; Jingjing Zhang; Tie Jun Cui; Yu Luo
• Keywords: Lattice (music); Topological insulator

Unlike conventional topological materials that carry states at their boundaries, higher-order are able to support boundaries of such as corners and hinges. While band topology has been recently extended into thermal diffusion for metamaterials, its realization is limited a 1D lattice, lacking access the topology. In this work, experimental reported insulator in generalized 2D lattice. The corner observed bandgap rate bulk, consequence anti-Hermitian nature Hamiltonian. protection these demonstrated with stability profile presence amorphous deformation. This work constitutes first purely diffusive systems opens door future management beyond geometries.