Topological corner states in non-Hermitian photonic crystals

Higher-order topological insulators and superconductors are topological phases that can exhibit novel boundary states on corners or edges. The effects of non-Hermiticity on higher-order topological physics have been presented recently in a few works. Here we extend this concept into non-Hermitian ph...

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Bibliographic Details
Published inOptics communications Vol. 466; p. 125653
Main Authors Zhou, Xingping, Wu, Jing, Wu, Yongfeng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2020
Subjects
Non-Hermitian
Parity-time symmetry
Photonic crystals
Topologic
Non-Hermitian
Topologic
Parity-time symmetry
Photonic crystals
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Summary:Higher-order topological insulators and superconductors are topological phases that can exhibit novel boundary states on corners or edges. The effects of non-Hermiticity on higher-order topological physics have been presented recently in a few works. Here we extend this concept into non-Hermitian photonic crystals. For such a non-Hermitian system, we find that the second-order corner state occurs at all corners when the parity-time symmetry is intact, while the second-order corner state occurs at some particular corners when the parity-time symmetry is broken. We hope the newly found corner modes may expand the understanding in a non-Hermitian photonic crystals system.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2020.125653