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Acoustic valley edge states in a graphene-like system with sub-wavelength resonator
Jiang H(姜恒); Chen M(陈猛); 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

Recently, the study of topological phase transitions and edge states for acoustic wave systems has become a research hotspot. However, most current studies on topological edge states are based on Bragg scattering, which is not practical to apply in situations involving low-frequency sound because of the large structural dimensions. Therefore, we construct in this study a graphene-like structure based on a sub-wavelength resonant unit Helmholtz resonator and adjust the acoustic capacitance diameter of adjacent units to change the local resonance frequency, and thereby impose the degeneracy of the Dirac cone and topological spin states, which is characterized by valley Chern numbers of opposite sign. We also check topological valley edge states at zigzag and armchair interfaces and find that gapless topological valley edge states only appear at zigzag interfaces, whereas armchair interfaces host gap edge states. Moreover, the results show that the transmission properties of edge states in a zigzag rectangular waveguide are immune to backscattering and defects © Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. All rights reserved.

KeywordAcoustic metamaterials Dirac cones Edge state Graphene likes Helmholtz resonators Structural dimensions Sub wavelength resonators Transmission property
ISBN9781999181000
Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/80472
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
Jiang H,Chen M,Wang YR. Acoustic valley edge states in a graphene-like system with sub-wavelength resonator[C]Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019,2019.
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