Topological valley transport of plate-mode waves in a homogenous thin plate with periodic stubbed surface
Jiu-Jiu Chen,
Shao-Yong Huo,
Zhi-Guo Geng,
Hong-Bo Huang,
Xue-Feng Zhu
Affiliations
Jiu-Jiu Chen
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, People’s Republic of China
Shao-Yong Huo
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, People’s Republic of China
Zhi-Guo Geng
School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
Hong-Bo Huang
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, People’s Republic of China
Xue-Feng Zhu
School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
The study for exotic topological effects of sound has attracted uprising interests in fundamental physics and practical applications. Based on the concept of valley pseudospin, we demonstrate the topological valley transport of plate-mode waves in a homogenous thin plate with periodic stubbed surface, where a deterministic two-fold Dirac degeneracy is form by two plate modes. We show that the topological property can be controlled by the height of stubs deposited on the plate. By adjusting the relative heights of adjacent stubs, the valley vortex chirality and band inversion are induced, giving rise to a phononic analog of valley Hall phase transition. We further numerically demonstrate the valley states of plate-mode waves with robust topological protection. Our results provide a new route to design unconventional elastic topological insulators and will significantly broaden its practical application in the engineering field.
