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Title: Topological phase transition induced by gain and loss in a photonic Chern insulator
Authors: Teo, Hau Tian
Xue, Haoran
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2022
Source: Teo, H. T., Xue, H. & Zhang, B. (2022). Topological phase transition induced by gain and loss in a photonic Chern insulator. Physical Review A, 105(5), 053510-.
Project: MOE2016- T3-1-006
Journal: Physical Review A
Abstract: We present a design of a non-Hermitian photonic Chern insulator whose band topology can be tuned via gain and loss. It is found that, by continuously varying the gain and loss parameter, a topological phase transition can take place in the photonic crystal, accompanied by the closing and reopening of a Dirac cone. We demonstrate this phenomenon through numerical simulations of the bulk and the edge dispersions, and steady field distributions excited by a point source. Our results show the possibility of non-Hermitian control over band topology in a Chern insulator setting and may find applications in active topological photonic devices.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.105.053510
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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