Unambiguous scattering matrix for non-Hermitian systems

Novitsky, A.V.; Lyakhov, D.A.; Michels, D.L.; Pavlov, A.A.; Shalin, A.S.; Novitsky, D.V.

Авторы: Novitsky Andrey V., Lyakhov Dmitry A., Michels Dominik L., Pavlov Alexander A., Shalin Alexander S., Novitsky Denis V.
Журнал: Physical Review A
Том: 101
Номер: 4
Год издания: 2020
Издательство: American Physical Society
Местоположение издательства: USA
DOI: 10.1103/PhysRevA.101.043834
Аннотация: PT symmetry is a unique platform for light manipulation and versatile use in unidirectional invisibility, lasing, sensing, etc. Broken and unbroken PT-symmetric states in non-Hermitian open systems are described by scattering matrices. A multilayer structure, as a simplest example of the open system, has no certain definition of the scattering matrix, since the output ports can be permuted. The uncertainty in definition of the exceptional points bordering PT-symmetric and PT-symmetry-broken states poses an important problem, because the exceptional points are indispensable in applications such as sensing and mode discrimination. Here we derive the proper scattering matrix from the unambiguous relation between the PT-symmetric Hamiltonian and scattering matrix. We reveal that the exceptional points of the scattering matrix with permuted output ports are not related to the PT symmetry breaking. Nevertheless, they can be employed for finding a lasing onset as demonstrated in our time-domain calculations and scattering-matrix pole analysis. Our results are important for various applications of the non-Hermitian systems including encircling exceptional points, coherent perfect absorption, PT-symmetric plasmonics, etc. © 2020 American Physical Society.
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Unambiguous scattering matrix for non-Hermitian systemsстатья

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