Symmetry-enforced three-dimensional Dirac phononic crystals

Xiangxi Cai; Liping Ye; Chunyin Qiu; Meng Xiao; Rui Yu; Manzhu Ke; Zhengyou Liu

doi:10.1038/s41377-020-0273-4

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Symmetry-enforced three-dimensional Dirac phononic crystals

Letters

- Symmetry-enforced three-dimensional Dirac phononic crystals
- Light: Science & Applications Vol. 9, Issue 3, Pages: 485-490(2020)
- Affiliations：
  
  1.Key Laboratory of Artificial Micro-Structures and Nano-Structures of Ministry of Education and School of Physics and Technology, Wuhan University, 430072 Wuhan, China
  2.Institute for Advanced Studies, Wuhan University, 430072 Wuhan, China
- Author bio：
  
  Liping Ye (lpye@whu.edu.cn)
  Zhengyou Liu (zyliu@whu.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-0273-4
  CLC：
- Published：2020，
  
  Published Online：10 March 2020，
  
  Received：16 October 2019，
  
  Revised：15 February 2020，
  
  Accepted：24 February 2020
- Accepted：
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Cai, X. X. et al. Symmetry-enforced three-dimensional Dirac phononic crystals. Light: Science & Applications, 9, 485-490 (2020).
DOI：

Cai, X. X. et al. Symmetry-enforced three-dimensional Dirac phononic crystals. Light: Science & Applications, 9, 485-490 (2020). DOI： 10.1038/s41377-020-0273-4.

摘要

Abstract

Dirac semimetals

the materials featuring fourfold degenerate Dirac points

are critical states of topologically distinct phases. Such gapless topological states have been accomplished by a band-inversion mechanism

in which the Dirac points can be annihilated pairwise by perturbations without changing the symmetry of the system. Here

we report an experimental observation of Dirac points that are enforced completely by the crystal symmetry using a nonsymmorphic three-dimensional phononic crystal. Intriguingly

our Dirac phononic crystal hosts four spiral topological surface states

in which the surface states of opposite helicities intersect gaplessly along certain momentum lines

as confirmed by additional surface measurements. The novel Dirac system may release new opportunities for studying elusive (pseudo) and offer a unique prototype platform for acoustic applications.

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references

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