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Title: Robust large-area elastic transverse wave transport in active acoustic metamaterials
Authors: Chen, Zhenyu
Wang, Xiangyu
Lim, C. W.
Shi, Fan
Keywords: Engineering::Civil engineering
Issue Date: 2022
Source: Chen, Z., Wang, X., Lim, C. W. & Shi, F. (2022). Robust large-area elastic transverse wave transport in active acoustic metamaterials. Journal of Applied Physics, 131(18), 185112-.
Journal: Journal of Applied Physics
Abstract: We investigate robust large-area elastic transverse wave propagation in an actively tunable membrane-type acoustic metamaterial. The waveguide with multiple degrees of freedom to control the width of the interface mode is realized by designing a heterostructure including three domains. One central domain is constructed by periodic unit cells in an ordinary state, where a Dirac cone can be observed in the band structure. The other two domains consist of periodic unit cells possessing opposite valley Chern numbers, respectively. By employing a finite element model, the topologically protected interface states with tunable degrees of freedom are exhibited. The energy of interface states distributes equally in the large-central region. Although a larger degree of freedom leads to lower amplitudes of interface states, larger total energy is demonstrated by defining a quality factor. Moreover, we design several waveguides with straight lines and sharp corners with different angles and denote three different notations to show clearly that the large-area transverse wave can propagate robustly through sharp corners. Finally, it is found that the large-area transverse wave transport shows immunity to disorders and defects in the propagation path.
ISSN: 0021-8979
DOI: 10.1063/5.0087988
Schools: School of Civil and Environmental Engineering 
Rights: © 2022 Author(s). All rights reserved. This paper was published by AIP Publishing in Journal of Applied Physics and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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