Fragile topology based helical edge states in two-dimensional moon-shaped photonic crystals

We study topological phases in a two-dimensional photonic crystal in a hexagonal lattice composed of an all-dielectric moon-shaped column (MSC) array, which preserves time-reversal symmetry, by calculating band structures, the Wilson loop, edge states, and topological-protected helical surface waves...

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Veröffentlicht in:	Physical review. B 2020-12, Vol.102 (24), Article 245149
Hauptverfasser:	Li, Zhongfu, Chan, Hsun-Chi, Xiang, Yuanjiang
Format:	Artikel
Sprache:	eng
Schlagworte:	Crystal lattices Eigenvalues Hexagonal lattice Mathematical analysis Phase transitions Photonic crystals Point sources Surface waves Topology Wave propagation
Online-Zugang:	Volltext
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