Higher-order topological phases in tunable $C_3$-symmetric photonic crystals
Optics
2021-09-01 v1
Abstract
We demonstrate that multiple higher-order topological transitions can be triggered via the continuous change of the geometry in kagome photonic crystals composed of three dielectric rods. By tuning a single geometry parameter, the photonic corner and edge states emerge or disappear with the higher-order topological transitions. Two distinct higher-order topological insulator phases and a normal insulator phase are revealed. Their topological indices are obtained from symmetry representations. A photonic analog of fractional corner charge is introduced to distinguish the two higher-order topological insulator phases. Our predictions can be readily realized and verified in configurable dielectric photonic crystals.
Keywords
Cite
@article{arxiv.2102.11388,
title = {Higher-order topological phases in tunable $C_3$-symmetric photonic crystals},
author = {Hai-Xiao Wang and Li Liang and Bin Jiang and Junhui Hu and Xiancong Lu and Jian-Hua Jiang},
journal= {arXiv preprint arXiv:2102.11388},
year = {2021}
}