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Mode Exchange and Phase Jumps at Exceptional Points in Anisotropy-Driven Layered Non-Hermitian Structures

Year: 2026

Type: article

Abstract: Exceptional points (EPs) are the most intriguing features of non-Hermitian systems associated with symmetry- and topology-driven applications. In this paper, we study the influence of tunable anisotropy on the topological properties of EPs in PT-symmetric layered structures. In particular, the eigenvalues exchange and eigenmodes exchange are predicted at the points of equal light transmission of different polarizations. We also unveil that the EPs tailored by the anisotropy parameters are associated with the π phase jump of reflection coefficients. Indirect evidence for the topological nature of EPs shown here is important for deeper insights into behaviors of anisotropic non-Hermitian systems and can be further used for the development of tunable non-Hermitian sensors and other applications.

Source: Photonics

DOI: 10.3390/photonics13020201

Authors: Milena Ramanovich, Andrey Novitsky, Denis V. Novitsky

Institutions: National Academy of Sciences of Belarus, B.I. Stepanov Institute of Physics, Belarusian State University

Language: English

Topic: Quantum Mechanics and Non-Hermitian Physics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

OpenAlex ID: W7130420030

FWCI: 2.844

Cites: 39

Cited by: 1

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