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) | |
会议录名称 | Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019 |
2019 | |
会议名称 | 26th International Congress on Sound and Vibration, ICSV 2019 |
会议日期 | July 7, 2019 - July 11, 2019 |
会议地点 | Montreal, QC, Canada |
摘要 | 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. |
关键词 | Acoustic metamaterials Dirac cones Edge state Graphene likes Helmholtz resonators Structural dimensions Sub wavelength resonators Transmission property |
ISBN号 | 9781999181000 |
收录类别 | EI |
语种 | 英语 |
文献类型 | 会议论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/80472 |
专题 | 微重力重点实验室 |
作者单位 | Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China |
推荐引用方式 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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