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.

我们设计了一种超分子结构，由空气中两个方向相反的相同散射体组成。通过调整它们之间的间隔并旋转它们，就会发生拓扑相变。旋转和平移操作的结合为我们提供了广泛的界面状态和实现界面状态的多项选择。因此，界面态必须存在于两个拓扑相不同的子晶格的界面上。我们从理论上研究了通过 T 形结传播的亚波长界面态，该 T 形结由三个一维波导组成。该结果在开发基于界面态的声学双通道传输器件方面具有广阔的前景。