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Non-Hermitian chiral degeneracy of gated graphene metasurfaces

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Title
Non-Hermitian chiral degeneracy of gated graphene metasurfaces
Author(s)
Soojeong Baek; Sang Hyun Park; Donghak Oh; Kanghee Lee; Sangha Lee; Hosub Lim; Taewoo Ha; Hyun Sung Park; Shuang Zhang; Lan Yang; Bumki Min; Teun-Teun Kim
Publication Date
2023-04
Journal
Light: Science and Applications, v.12, no.1
Publisher
Springer Nature
Abstract
© 2023 Springer Nature Limited. Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive manner. Here, we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene metasurface. More specifically, the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral EP. Interestingly, the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface, revealing the missing dimension at the chiral EP. In addition, the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and, consequently, the observation of enhanced asymmetric polarisation conversion. We anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs.
URI
https://pr.ibs.re.kr/handle/8788114/13293
DOI
10.1038/s41377-023-01121-6
ISSN
2095-5545
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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