Topological photonic crystals with zero Berry curvature

Liu, Feng, Deng, Hai-Yao ORCID: https://orcid.org/0000-0001-6065-483X and Wakabayashi, Katsunori 2018. Topological photonic crystals with zero Berry curvature. Physical Review B 97 (3) , 035442. 10.1103/PhysRevB.97.035442

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Abstract

Topological photonic crystals are designed based on the concept of Zak's phase rather than the topological invariants such as the Chern number and spin Chern number, which rely on the existence of a nonvanishing Berry curvature. Our photonic crystals (PCs) are made of pure dielectrics and sit on a square lattice obeying the C 4 v point-group symmetry. Two varieties of PCs are considered: one closely resembles the electronic two-dimensional Su-Schrieffer-Heeger model, and the other continues as an extension of this analogy. In both cases, the topological transitions are induced by adjusting the lattice constants. Topological edge modes (TEMs) are shown to exist within the nontrivial photonic band gaps on the termination of those PCs. The high efficiency of these TEMs transferring electromagnetic energy against several types of disorders has been demonstrated using the finite-element method.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2469-9950
Date of First Compliant Deposit:	20 January 2020
Last Modified:	05 May 2023 11:05
URI:	https://orca.cardiff.ac.uk/id/eprint/128133

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