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Non-abelian charged nodal links in a dielectric photonic crystal

Park, Haedong, Wong, Stephan, Zhang, Xiao and Oh, Sang Soon 2021. Non-abelian charged nodal links in a dielectric photonic crystal. ACS Photonics 8 (9) , pp. 2746-2754. 10.1021/acsphotonics.1c00876

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Abstract

A nodal link is a special form of a line degeneracy (a nodal line) between adjacent bands in the momentum space of a three-dimensional topological crystal. Unlike nodal chains or knots, a nodal link consists of two or more mutually linked rings that do not touch each other. Recent studies on non-Abelian band topology revealed that the topological charges of the nodal links can have the properties of quaternions. However, a photonic crystal that has a nodal link with non-Abelian charges has not been reported. Here, we propose dielectric photonic crystals in the form of double diamond structures that realize the nodal links in the momentum space. By examining the evolution of the eigenstate correlations along closed loops that enclose the nodal line(s) of the links, their non-Abelian topological charges are also analyzed. The proposed design scheme and theoretical approach in this work will allow for experimental observation of photonic non-Abelian charges in purely dielectric materials and facilitate the control of the degeneracy in complex photonic structures.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Chemical Society
ISSN: 2330-4022
Date of First Compliant Deposit: 21 September 2021
Date of Acceptance: 16 August 2021
Last Modified: 21 Sep 2021 13:45
URI: https://orca.cardiff.ac.uk/id/eprint/143752

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