Selective Activation Of Topological Edge and Corner States on Dislocation Interfaces
Yan Liu, Lifeng Wang, Yuping Tian, Yuqiang Gao
Abstract: Topological edge and corner states have been demonstrated at the interfaces between two topologically distinct metamaterials. In this study, the topological edge and corner states of the dislocation interfaces between two elastic metamaterial plates with the same bulk lattice are investigated. Supercell analysis reveals that a bandgap emerges between the edge and bulk bands for two different dislocation interfaces. Multichannel structures containing both interfaces are designed, and selective activation and waveguide transmission of the edge states are observed. In addition to the edge states, antisymmetrical corner states with high localization are observed in metamaterial plates with triangular interfaces. The robustness of the corner states is demonstrated by introducing different types of imperfections near the corners. Moreover, the feature of selective activation is verified in a parallelogram-shaped structure, which facilitates the realization of elastic switches. This study provides a reference for manipulating elastic waves in topological metamaterials with a single bulk lattice.
文章链接：https://www.sciencedirect.com/science/article/pii/S0997753825003808
