Dirac points and the transition towards Weyl points in three-dimensional sonic crystals

Boyang Xie; Hui Liu; Hua Cheng; Zhengyou Liu; Jianguo Tian; Shuqi Chen

doi:10.1038/s41377-020-00416-2

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Dirac points and the transition towards Weyl points in three-dimensional sonic crystals

Original Articles

- Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
- Light: Science & Applications Vol. 9, Issue 6, Pages: 1841-1849(2020)
- Affiliations：
  
  1.The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics, TEDA Institute of Applied Physics, and Renewable Energy Conversion and Storage Center, Nankai University, 300071 Tianjin, China
  2.The Key Laboratory of Artificial Micro- and Nanostructures of the Ministry of Education and School of Physics and Technology, Wuhan University, 430072 Wuhan, China
  3.The Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006 Taiyuan, Shanxi, China
  4.The Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, 250358 Jinan, China
- Author bio：
  
  Hua Cheng (hcheng@nankai.edu.cn)
  Shuqi Chen (schen@nankai.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-00416-2
  CLC：
- Published：2020，
  
  Published Online：22 December 2020，
  
  Received：04 April 2020，
  
  Revised：26 September 2020，
  
  Accepted：27 September 2020
- Accepted：
Scan QR Code
Xie, B. Y. et al. Dirac points and the transition towards Weyl points in three-dimensional sonic crystals. Light: Science & Applications, 9, 1841-1849 (2020).
DOI：

Xie, B. Y. et al. Dirac points and the transition towards Weyl points in three-dimensional sonic crystals. Light: Science & Applications, 9, 1841-1849 (2020). DOI： 10.1038/s41377-020-00416-2.

摘要

Abstract

A four-fold-degenerate three-dimensional (3D) Dirac point

represents a degenerate pair of Weyl points carrying opposite chiralities. Moreover

3D Dirac crystals have shown many exotic features different from those of Weyl crystals. How these features evolve from 3D Dirac to Weyl crystals is important in research on 3D topological matter. Here

we realized a pair of 3D acoustic Dirac points from band inversion in a hexagonal sonic crystal and observed the surface states and helical interface states connecting the Dirac points. Furthermore

each Dirac point can transition into a pair of Weyl points with the introduction of chiral hopping. The exotic features of the surface states and interface states are inherited by the resulting Weyl crystal. Our work may serve as an ideal platform for exploring exotic physical phenomena in 3D topological semimetals.

关键词

Keywords

references

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