Vectorial Bulk-Boundary Correspondence for 3D Photonic Chern Insulators

Chiara Devescovi, Mikel García-Díez, Barry Bradlyn, Juan L. Mañes, Maia G. Vergniory, Aitzol García-Etxarri

Research output: Contribution to journalArticlepeer-review

Abstract

In 2D Chern insulators, the topology of the bulk states is captured by a topological invariant, the Chern number. The scalar bulk-boundary correspondence (sBBC) relates the change in Chern number across an interface with the number of 1D chiral edge modes at the interface. However, 3D Chern insulators (3D CIs) can be characterized by a Chern vector (Formula presented.) and a more general vector bulk-boundary correspondence (vBBC) is needed to correctly predict the propagation of the surface modes. In this work the possible interfaces between 3D photonic CIs are explored, focusing on possible changes in Chern vector orientation. To formulate a 3D vBBC, a link is derived between the Chern vector discontinuity across an interface and the winding of the surface equifrequency loops on the boundary. Last, it is demonstrated how to correctly predict the number and the propagation direction of topological photonic surface modes in 3D CIs.

Original languageEnglish (US)
Article number2200475
JournalAdvanced Optical Materials
Volume10
Issue number20
DOIs
StatePublished - Oct 18 2022
Externally publishedYes

Keywords

  • Chern vectors
  • bulk-boundary correspondence
  • photonic surface modes
  • planar interfaces

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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