摘要
A valley topological acoustic waveguide based on two chiral sonic crystals is studied.Two sonic crystals composed of right-handed and left-handed chiral scatterers have different valley topology properties.When both types of chiral windmill scatterers rotate from-60°to 60°,their corresponding sonic crystals exhibit two accidental degenerated Dirac points and valley Hall phase transition.Two chiral sonic crystals with opposite valley Hall phase are selected to design a valley topological waveguide.It is found that there exist a pair of valley edge states localized at the domain wall of the waveguide in the overlapping band gap.The experimental results show that the edge states can support valley topological acoustic transport well,and have a certain robustness to the defects of bends and disorder around the domain wall of the waveguide.
基金
supported by the National Natural Science Foundation of China(11774137,12274183)
the China Postdoctoral Science Foundation(2020M671351)
the Postdoctoral Research Funding Program of Jiangsu Province(2021K567C)。
