期刊
AIP ADVANCES
卷 7, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5006010
关键词
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资金
- National Natural Science Foundation of China [11374093, 11674119, 11404125, 11690030]
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body [71375006]
- Young Scholar fund - common university and college of the province in Hunan
- Bird Nest Plan of HUST
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. (C) 2017 Author(s).
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