Metastable two-component solitons near an exceptional point

Abstract

We consider a two-dimensional nonlinear waveguide with distributed gain and losses. The optical potential describing the system consists of an unperturbed complex potential depending only on one transverse coordinate, i.e., corresponding to a planar waveguide, and a small non-separable perturbation depending on both transverse coordinates. It is assumed that the spectrum of the unperturbed planar waveguide features an exceptional point (EP), while the perturbation drives the system into the unbroken phase. Slightly below the EP, the waveguide sustains two-component envelope solitons. We derive one-dimensional equations for the slowly varying envelopes of the components and show their stable propagation. When both traverse directions are taken into account within the framework of the original model, the obtained two-component bright solitons become metastable and persist over remarkably long propagation distances.

arXiv comment9 pages, 5 figures; several typos corrected; final version

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Cited by in corpus (5)

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• Phase transitions in quasi-Hermitian quantum models at exceptional points of order four
• Emergence and localization of exceptional points in an exactly solvable toy model
• Triple exceptional point with unitary paths of unfolding in a three-site fermionic Swanson-like model
• Twin Hamiltonians, three types of the Dyson maps, and the probabilistic interpretation problem in quasi-Hermitian quantum mechanics