Tunable Dirac cones in two-dimensional acoustic metamaterials with matryoshka structure | |
Chen M(陈猛); Xu WS(徐文帅); Liu Y(刘宇); Zhang MG; Pei DL; Jiang H(姜恒); Wang YR(王育人) | |
刊名 | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA |
2019-07-01 | |
卷号 | 146期号:1页码:767-772 |
ISSN号 | 0001-4966 |
DOI | 10.1121/1.5115007 |
英文摘要 | 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. This paper proposes 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 helical 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. (C) 2019 Acoustical Society of America. |
分类号 | 二类 |
资助项目 | National Natural Science Foundation of China[11602269] ; National Natural Science Foundation of China[11802213] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040301] ; Research Program of Beijing[Z161100002616034] ; Research Program of Beijing[Z171100000817010] |
WOS关键词 | PHASE |
WOS研究方向 | Acoustics ; Audiology & Speech-Language Pathology |
语种 | 英语 |
WOS记录号 | WOS:000478628800081 |
资助机构 | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Research Program of Beijing |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/79452] |
专题 | 力学研究所_国家微重力实验室 |
通讯作者 | Wang YR(王育人) |
推荐引用方式 GB/T 7714 | Chen M,Xu WS,Liu Y,et al. Tunable Dirac cones in two-dimensional acoustic metamaterials with matryoshka structure[J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,2019,146(1):767-772. |
APA | Chen M.,Xu WS.,Liu Y.,Zhang MG.,Pei DL.,...&Wang YR.(2019).Tunable Dirac cones in two-dimensional acoustic metamaterials with matryoshka structure.JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA,146(1),767-772. |
MLA | Chen M,et al."Tunable Dirac cones in two-dimensional acoustic metamaterials with matryoshka structure".JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 146.1(2019):767-772. |
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