Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium

Yachao Liu; Mingwei Wang; Yongqing Huang; Guo Ping Wang; Shuang Zhang

doi:10.1038/s41377-024-01632-w

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Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium

Original Articles

- Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium
- Light: Science & Applications Vol. 13, Issue 11, Pages: 2794-2801(2024)
- Affiliations：
  
  1.State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
  2.Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
  3.Department of Physics, University of Hong Kong, Hong Kong, China
  4.Department of Electrical & Electronic Engineering, University of Hong Kong, Hong Kong, China
- Author bio：
  
  Yachao Liu (yachaoliu@szu.edu.cn)
  Guo Ping Wang (gpwang@szu.edu.cn)
  Shuang Zhang (shuzhang@hku.hk)
- Funds：
- DOI：10.1038/s41377-024-01632-w
  CLC：
- Received：14 May 2024，
  
  Revised：02 September 2024，
  
  Accepted：2024-09-10，
  
  Published Online：27 September 2024，
  
  Published：30 November 2024
- Accepted：
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Liu, Y. C. et al. Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium. Light: Science & Applications, 13, 2794-2801 (2024).
DOI：

Liu, Y. C. et al. Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium. Light: Science & Applications, 13, 2794-2801 (2024). DOI： 10.1038/s41377-024-01632-w.

摘要

Abstract

Propagation properties of electromagnetic waves in an optical medium are mainly determined by the contour of equal-frequency states in

$$ {\boldsymbol{k}} $$

-space. In photonic Weyl media

the topological surface waves lead to a unique open arc of the equal-frequency contour

called the Fermi arc. However

for most realistic Weyl systems

the shape of Fermi arcs is fixed due to the constant impedance of the surrounding medium

making it difficult to manipulate the surface wave. Here we demonstrate that by adjusting the thickness of the air layer sandwiched between two photonic Weyl media

the shape of the Fermi arc can be continuously changed from convex to concave. Moreover

we show that the concave Fermi-arc waves can be used to achieve topologically protected electromagnetic pulling forces over a broad range of angles in the air layer. Our finding offers a generally applicable strategy to shape the Fermi arc in photonic Weyl media.

关键词

Keywords

references

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