Abstract
We design a supermolecular structure composed of two identical scatterers with opposite orientations in air. By adjusting the interval between them and rotating them, topological phase transitions occur. The combination of rotational and translational operations provides us with wide scope of interface states and multiple-choice to achieve interface states. Therefore, the interface states must exist at the interface between two sublattices with different topological phases. We investigate the subwavelength interface states propagating through a T-shaped junction theoretically, which consists of three one-dimensional waveguides. The results have promising prospects in developing acoustic double-channel transmission devices based on interface states.
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