Reconfigurable waveguide based on valley topological phononic crystals with local symmetry inversion via continuous translation

Abstract We proposed a reconfigurable valley topological acoustic waveguide constructed using 2D phononic crystal (PnC) with C 3v symmetric arrangement of three rods in the unit cell. An interface between two types PnCs differently oriented cells exhibits high robustness transport waves via topologically protected state. Structural reconfiguration was introduced by continuous translation rod arrays PnCs. The phase transition this translational change quantitatively identified Berry curvature. leaves dimer array at interface, creating localized/defective mode along waveguide. Despite presence localized mode, wave can propagate same as original be used to turn on and off bandgap. This new approach design robust device reconfigurability.