Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals

Zhongfei Xiong; Ruo-Yang Zhang; Rui Yu; C. T. Chan; Yuntian Chen

doi:10.1038/s41377-020-00382-9

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Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals

Original Articles

- Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals
- Light: Science & Applications Vol. 9, Issue 6, Pages: 1800-1809(2020)
- Affiliations：
  
  1.School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
  2.Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
  3.School of Physics and Technology, Wuhan University, Wuhan 430072, China
  4.Wuhan National Laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
- Author bio：
  
  C. T. Chan (phchan@ust.hk)
  Yuntian Chen (yuntian@hust.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-00382-9
  CLC：
- Published：2020，
  
  Published Online：19 October 2020，
  
  Received：16 March 2020，
  
  Revised：27 July 2020，
  
  Accepted：06 August 2020
- Accepted：
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Xiong, Z F. et al. Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals. Light: Science & Applications, 9, 1800-1809 (2020).
DOI：

Xiong, Z F. et al. Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals. Light: Science & Applications, 9, 1800-1809 (2020). DOI： 10.1038/s41377-020-00382-9.

摘要

Abstract

It was recently demonstrated that the connectivities of bands emerging from zero frequency in dielectric photonic crystals are distinct from their electronic counterparts with the same space groups. We discover that in an AB-layer-stacked photonic crystal composed of anisotropic dielectrics

the unique photonic band connectivity leads to a new kind of symmetry-enforced triply degenerate points at the nexuses of two nodal rings and a Kramers-like nodal line. The emergence and intersection of the line nodes are guaranteed by a generalized 1/4-period screw rotation symmetry of Maxwell's equations. The bands with a constant

and iso-frequency surfaces near a nexus point both disperse as a spin-1 Dirac-like con

giving rise to exotic transport features of light at the nexus point. We show that spin-1 conical diffraction occurs at the nexus point

which can be used to manipulate the charges of optical vortices. Our work reveals that Maxwell's equations can have hidden symmetries induced by the fractional periodicity of the material tensor components and hence paves the way to finding novel topological nodal structures unique to photonic systems.

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