Underwater acoustic metamaterial based on double Dirac cone characteristics in rectangular phononic crystals
文献类型：期刊论文
| 作者 | Pei DL(裴东亮)1,2; Yang T(杨洮)1,2 ; Chen M(陈猛)1,2; Jiang H(姜恒)1,2
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| 刊名 | CHINESE PHYSICS B
 |
| 出版日期 | 2019-11-01 |
| 卷号 | 28期号:12页码:6 |
| ISSN号 | 1674-1056 |
| 关键词 | double Dirac cone topological edge state rectangular phononic crystal topological phase transition |
| DOI | 10.1088/1674-1056/ab55d2 |
| 通讯作者 | Chen, Meng(chenmeng@imech.ac.cn) ; Jiang, Heng(hengjiang@imech.ac.cn) |
| 英文摘要 | We theoretically construct a rectangular phononic crystal (PC) structure surrounded by water with C-2v symmetry, and then place a steel rectangular scatterer at each quarter position inside each cell. The final complex crystal has two forms: the vertical type, in which the distance s between the center of the scatterer and its right-angle point is greater than 0.5a, and the transverse type, in which s is smaller than 0.5a (where a is the crystal constant in the x direction). Each rectangular scatterer has three variables: length L, width D, and rotation angle theta around its centroid. We find that, when L and D change and theta is kept at zero, there is always a linear quadruply degenerate state at the corner of the irreducible Brillouin zone. Then, we vary theta and find that the quadruply degenerate point splits into two doubly-degenerate states with odd and even parities. At the same time, the band structure reverses and undergoes a phase change from topologically non-trivial to topologically trivial. Then we construct an acoustic system consisting of a trivial and a non-trivial PC with equal numbers of layers, and calculate the projected band structure. A helical one-way transmission edge state is found in the frequency range of the body band gap. Then, we use the finite-element software Comsol to simulate the unidirectional transmission of this edge state and the backscattering suppression of right-angle, disorder, and cavity defects. This acoustic wave system with rectangular phononic crystal form broadens the scope of acoustic wave topology and provides a platform for easy acoustic operation. |
| 分类号 | Q3 |
| WOS关键词 | EDGE STATES ; TRANSITION |
| 资助项目 | National Natural Science Foundation of China[11602269] ; National Natural Science Foundation of China[11972034] ; National Natural Science Foundation of China[11802213] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040301] ; Research Program of Beijing, China[Z161100002616034] ; Research Program of Beijing, China[Z171100000817010] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000516543800001 |
| 资助机构 | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Research Program of Beijing, China |
| 其他责任者 | Chen, Meng ; Jiang, Heng |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/81607]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 0090, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Pei DL,Yang T,Chen M,et al. Underwater acoustic metamaterial based on double Dirac cone characteristics in rectangular phononic crystals[J]. CHINESE PHYSICS B,2019,28(12):6. |
| APA | 裴东亮,杨洮,陈猛,&姜恒.(2019).Underwater acoustic metamaterial based on double Dirac cone characteristics in rectangular phononic crystals.CHINESE PHYSICS B,28(12),6. |
| MLA | 裴东亮,et al."Underwater acoustic metamaterial based on double Dirac cone characteristics in rectangular phononic crystals".CHINESE PHYSICS B 28.12(2019):6. |
入库方式： OAI收割
来源：力学研究所
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