Tunable Dirac cones in two-dimensional acoustic metamaterials with Matryoshka structure | |
Chen M(陈猛)![]() ![]() ![]() | |
Source Publication | Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019 |
2019 | |
Conference Name | 26th International Congress on Sound and Vibration, ICSV 2019 |
Conference Date | July 7, 2019 - July 11, 2019 |
Conference Place | Montreal, 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. |
Keyword | Acoustic metamaterials Acoustic structures Dirac cones Dispersion curves Edge state Honeycomb lattices Topological phase Topological transitions |
ISBN | 9781999181000 |
Indexed By | EI ; CPCI-S |
Language | 英语 |
Document Type | 会议论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/80471 |
Collection | 国家微重力实验室 |
Affiliation | Key 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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