Dirac Cone Characteristics of Hexachiral Phononic Crystal

被引：0
|
作者：
Chen L. [1 ,2 ]
Wang J. [1 ,2 ]
Cui Y. [3 ]
Kong H. [1 ,2 ]
机构：
[1] State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai
[2] Key Laboratory of Marine Intelligent Equipment and System of the Ministry of Education, Shanghai Jiao Tong University, Shanghai
[3] Shanghai Second Militaryx Representative Office, Nanjing Military Representative Office of the Ministry of Army Equipment, Shanghai
来源：
Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University | 2021年 / 55卷 / 11期
关键词：
Band structure; Dirac cone; Directional band gap; Linear dispersion; Phononic crystal;
D O I：
10.16183/j.cnki.jsjtu.2020.242
中图分类号：
学科分类号：
摘要：
The band structure properties of phononic crystal is important to evaluate the vibration and noise reduction of acoustic metamaterials. Taking the 2D hexachiral phononic crystal as an example, the band structure and Dirac cone properties were investigated by numerical analysis, and the four-fold accidental degenerate Dirac point was obtained in the center of Brillouin zone. By adjusting the design parameters of ligament structure, a double Dirac cone was broken and a novel directional band gap was formed. The influence of geometric parameters on the directional band gaps width was investigated, and the band structure inversion problem was further discussed. This research can provide support for the application of hexachiral phononic crystal in elastic wave manipulation and acoustic topological insulator. © 2021, Shanghai Jiao Tong University Press. All right reserved.
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页码：1453 / 1458
页数：5
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