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Tunable Dirac cones in two-dimensional acoustic metamaterials with Matryoshka structure
Chen M(陈猛); Jiang H(姜恒); Wang YR(王育人)
Source PublicationProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
2019
Conference Name26th International Congress on Sound and Vibration, ICSV 2019
Conference DateJuly 7, 2019 - July 11, 2019
Conference PlaceMontreal, QC, Canada
Abstract

Dirac cones of an acoustic system are the foundation of most topological phase transitions and topological states, and have recently become a research hotspot. Although the Dirac cones, Dirac-like cones, double Dirac cones and semi-Dirac points are all skillfully designed, it is still indispensable to realize a tunable Dirac cone in a novel acoustic structure. We propose two-dimensional acoustic metamaterials with matryoshka structure to achieve tunable Dirac cones and topological spin states. Dirac points can be obtained on the dispersion curves owing to the high symmetry. The concentric circular scattering units of the matryoshka structure are arranged in honeycomb lattices. By a rotating-scatterer mechanism to break the symmetry, the Dirac cone at K (K') is split and the topological spin states appear at the band valley. The existence of a topological transition with opposite Chern numbers as the rotating angle varies is also verified, and chair edge states are obtained along the interfaces separating the topologically opposite spin states insulators. Moreover, the frequency of the Dirac cone is tuned by rotating the inner structure in a double-layer matryoshka structure © Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. All rights reserved.

KeywordAcoustic metamaterials Acoustic structures Dirac cones Dispersion curves Edge state Honeycomb lattices Topological phase Topological transitions
ISBN9781999181000
Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/80471
Collection国家微重力实验室
AffiliationKey Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
Recommended Citation
GB/T 7714
Chen M,Jiang H,Wang YR. Tunable Dirac cones in two-dimensional acoustic metamaterials with Matryoshka structure[C]Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019,2019.
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