1. Elastic valley Hall phases in bilayer phononic crystal.
- Author
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Wang, Zhen, Liu, Shiyuan, Yuan, Peilong, and Xu, Xiaodong
- Subjects
PHONONIC crystals ,LASER ultrasonics ,SEMIMETALS - Abstract
In this Letter, a bilayer elastic C
6 v structure is proposed and used to precisely manipulate two topological nontrivial valley pseudo-spin states. According to the theoretical simulation results, the two elastic pseudo-spin states have opposite valley polarizations along propagation directions. Owing to the interlayer polarization and mixing effects of the elastic valley pseudo-spin states in the bilayer elastic C6 v structure, the transport and prohibition of elastic valley pseudo-spin states and even the tunneling between layers are flexibly manipulated. The transmission efficiency of elastic valley pseudo-spin states across layers reaches 93%, which has also been confirmed in experiments by the laser ultrasonic method. The in-depth exploration of valley pseudo-spin states with layer indices further expands and enriches the research of valley pseudo-spin states in the elastic environment and lays the foundation for the further design of elastic topological devices. [ABSTRACT FROM AUTHOR]- Published
- 2022
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