Underwater acoustic metamaterial based on double Dirac cone characteristics in rectangular phononic crystals

doi:10.1088/1674-1056/ab55d2

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	Underwater acoustic metamaterial based on double Dirac cone characteristics in rectangular phononic crystals
	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
通讯作者	Chen, Meng(chenmeng@imech.ac.cn) ; Jiang, Heng(hengjiang@imech.ac.cn)
发表期刊	CHINESE PHYSICS B
	2019-11-01
卷号	28 期号:12 页码:6
ISSN	1674-1056
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.
关键词	double Dirac cone topological edge state rectangular phononic crystal topological phase transition
DOI	10.1088/1674-1056/ab55d2
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000516543800001
关键词[WOS]	EDGE STATES ; TRANSITION
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
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]
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Research Program of Beijing, China
论文分区	Q3
力学所作者排名	1
RpAuthor	Chen, Meng ; Jiang, Heng
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/81608
专题	微重力重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 0090, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, 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.

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