Photonic topological fermi nodal disk in nonHermitian magnetic plasma

Wenhui Wang; Wenlong Gao; Leifeng Cao; Yuanjiang Xiang; Shuang Zhang

doi:10.1038/s41377-020-0274-3

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Photonic topological fermi nodal disk in nonHermitian magnetic plasma

Article

- Photonic topological fermi nodal disk in nonHermitian magnetic plasma
- Light: Science & Applications Vol. 9, Issue 2, Pages: 369-376(2020)
- Affiliations：
  
  1.International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Institute of Microscale Optoelectronics (IMO), Shenzhen University, 518060 Shenzhen, China
  2.School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, UK
  3.National Key Laboratory for Laser Fusion, Research Centre of Laser Fusion, CAEP, 621900 Mianyang, China
  4.School of Physics and Electronics, Hunan University, 410082 Changsha, China
- Author bio：
  
  Yuanjiang Xiang (xiangyuanjiang@126.com)
  Shuang Zhang (s.zhang@bham.ac.uk)
- Funds：
- DOI：10.1038/s41377-020-0274-3
  CLC：
- Published：2020，
  
  Published Online：11 March 2020，
  
  Received：04 March 2019，
  
  Revised：13 January 2020，
  
  Accepted：26 February 2020
- Accepted：
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Wang, W. H. et al. Photonic topological fermi nodal disk in nonHermitian magnetic plasma. Light: Science & Applications, 9, 369-376 (2020).
DOI：

Wang, W. H. et al. Photonic topological fermi nodal disk in nonHermitian magnetic plasma. Light: Science & Applications, 9, 369-376 (2020). DOI： 10.1038/s41377-020-0274-3.

摘要

Abstract

Topological physics mainly arises as a necessary link between properties of the bulk and the appearance of surface states

and has led to successful discoveries of novel topological surface states in Chern insulators

topological insulators

and topological Fermi arcs in Weyl

Dirac

and Nodal line semimetals owing to their nontrivial bulk topology. In particular

topological phases in non-Hermitian systems have attracted growing interests in recent years. In this work

we predict the emergence of the topologically stable nodal disks where the real part of the eigen frequency is degenerate between two bands in non-ideal magnetohydrodynamics plasma with collision and viscosity dissipations. Each nodal disk possesses continuously distributed topological surface charge density that integrates to unity. It is found that the lossy Fermi arcs at the interface connect to the middle of the projection of the nodal disks. We further show that the emergence

coalescence

and annihilation of the nodal disks can be controlled by plasma parameters and dissipation terms. Our findings contribute to understanding of the linear theory of bulk and surface wave dispersions of non-ideal warm magnetic plasmas from the perspective of topological physics.

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Keywords

references

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