Disorder-Induced Topological State Transition in Photonic Metamaterials

Liu, Changxu, Gao, Wenlong, Yang, Biao and Zhang, Shuang (2017) Disorder-Induced Topological State Transition in Photonic Metamaterials. Physical Review Letters, 119 (18). p. 183901. ISSN 0031-9007

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Official URL: https://doi.org/10.1103/physrevlett.119.183901


The topological state transition has been widely studied based on the quantized topological band invariant such as the Chern number for the system without intense randomness that may break the band structures. We numerically demonstrate the disorder-induced state transition in the photonic topological systems for the first time. Instead of applying the ill-defined topological band invariant in a disordered system, we utilize an empirical parameter to unambiguously illustrate the state transition of the topological metamaterials. Before the state transition, we observe a robust surface state with well-confined electromagnetic waves propagating unidirectionally, immune to the disorder from permittivity fluctuation up to 60% of the original value. During the transition, a hybrid state composed of a quasiunidirectional surface mode and intensively localized hot spots is established, a result of the competition between the topological protection and Anderson localization.

Item Type: Article
Additional Information: Research funded by H2020 European Research Council (648783734578), Wolfson Foundation, Leverhulme Trust (RPG-2012-674)
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 14 Sep 2021 08:01
Last Modified: 14 Sep 2021 08:15
URI: http://nrl.northumbria.ac.uk/id/eprint/47170

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