Acoustic metamaterials with spinning components

We show that an acoustic metamaterial consisting of an array of spinning cylindrical inclusions can possess many unusual properties, including folded bulk bands and interface-state bands. The folding of bands inside the first Brillouin zone is made possible by a rotation-induced antiresonance of com...

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Bibliographic Details
Published in:Physical review. B 2020-02, Vol.101 (5), p.1, Article 054107
Main Authors: Zhao, Degang, Wang, Yao-Ting, Fung, Kin-Hung, Zhang, Zhao-Qing, Chan, C. T.
Format: Article
Language:English
Subjects:
Brillouin zones
Compressibility
Doppler effect
Inclusions
Metamaterials
Transport properties
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Summary:We show that an acoustic metamaterial consisting of an array of spinning cylindrical inclusions can possess many unusual properties, including folded bulk bands and interface-state bands. The folding of bands inside the first Brillouin zone is made possible by a rotation-induced antiresonance of compressibility and the rotational Doppler effect. Both bulk and interface-state band dispersions exhibit remarkable filling-fraction-dependent features such as the emergence of a cutoff frequency when the filling fraction exceeds a critical value. Robust one-way transport properties are supported by nondegenerate interface states, but within the same band, interface states at different frequencies can have different propagation directions.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.101.054107