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Characterizing and tuning exceptional points using Newton polygons

Jaiswal, R and Banerjee, A and Narayan, A (2023) Characterizing and tuning exceptional points using Newton polygons. In: New Journal of Physics, 25 (3).

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Official URL: https://doi.org/10.1088/1367-2630/acc1fe


The study of non-Hermitian degeneracies—called exceptional points (EPs)—has become an exciting frontier at the crossroads of optics, photonics, acoustics, and quantum physics. Here, we introduce the Newton polygon method as a general algebraic framework for characterizing and tuning EPs. Newton polygons, first described by Isaac Newton, are conventionally used in algebraic geometry, with deep roots in various topics in modern mathematics. We propose and illustrate how the Newton polygon method can enable the prediction of higher-order EPs, using a recently experimentally realized optical system. Using the paradigmatic Hatano-Nelson model, we demonstrate how our method can predict the presence of the non-Hermitian skin effect. As further application of our framework, we show the presence of tunable EPs of various orders in PT-symmetric one-dimensional models. We further extend our method to study EPs in higher number of variables and demonstrate that it can reveal rich anisotropic behaviour around such degeneracies. Our work provides an analytic recipe to understand exceptional physics.

Item Type: Journal Article
Publication: New Journal of Physics
Publisher: Institute of Physics
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Algebra; Optical systems; Skin effect, Algebraic framework; Algebraic geometry; Exceptional points; Hermitians; Institute of Physics; Newton polygon; Non-hermitian skin effect; Non-hermitian system; Quantum physics, Geometry
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 May 2023 10:23
Last Modified: 02 May 2023 10:23
URI: https://eprints.iisc.ac.in/id/eprint/81252

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