Topological Valley Transport of Elastic Waves Based on Periodic Triangular-Lattices

Topological transports of elastic waves have attracted much attention because their unique immunity to defects and backscattering-suppression ability. Periodic lattice structures are ideal carriers elastic-wave due ability manipulate waves. Compared with honeycomb-lattice structures, the wave-guide-path designs triangular-lattice higher flexibility. In this paper, topological in periodic structure explored. It is shown that differences between intra-coupling inter-coupling radii can cause destruction effective spatial inversion symmetry, which gives rise valley Hall phase transition forming edge states. Utilizing effect, traveling along linear Z-shaped waveguides realized low scattering defects. On basis, path-selection function obtained. states a good application prospects manipulations communications.