Reconfigurable topological phononic crystal slabs |
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Authors: | Lu-yang Feng Hong-bo Huang Jian-cheng Zhang Xiao-ping Xie Jiu-jiu Chen |
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Affiliation: | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China |
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Abstract: | We propose two-dimensional reconfigurable phononic crystal slabs that support topologically protected edge states for Lamb waves. It consists of a triangular lattice of triangular-like air holes perforated in a slab and two sandwich cylinders are placed in the matrix of each unit cell. The pseudospin–orbit coupling is achieved by shifting the sandwich cylinders up or down. The robust transport of Lamb waves along reconfigurable interfaces is further demonstrated. The dynamically reconfigurable design provides an excellent platform for tuning the frequency range of topological edge states and steering efficient transport of Lamb waves along arbitrary pathways, which can be employed for elastic-wave communications, signal processing, and sensing. |
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Keywords: | Topological edge state Reconfigurability Lamb wave Pseudospin–orbit coupling Robustness |
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