19th Asia-Pacific Vibration Conference (APVC2021)

Acoustic topological insulators (ATIs) has revealed excellent acoustic transmission characteristics robust against imperfections of the structure, which has attracted the world's attention recently. Here, we research the edge modes of zigzag interface of acoustic valley hall topological insulators (AVHTIs). The numerical results demonstrate that two different types of interfaces of AVHTIs own symmetric and antisymmetric edge modes about the interface, respectively. Next, we construct a multichannel system based on these two interfaces and the asymmetric acoustic transmission base on modes conversion can be realized by introducing a phase shifter into one of the channels. Our work may contribute to acoustic communication and the design of integrated acoustic device.

Asymmetric acoustic transmission; Topological insulators; Modes conversion