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Exceptional points and symmetry recovery in coupled ferromagnetic waveguides

This paper is available in a repository.
This paper is available in a repository.

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Abstract

We consider a two-state system consisting of a pair of coupled ferromagnetic waveguides. A monotonically increasing bias magnetic field can dynamically manipulate the system to enter a PT-symmetry broken phase and then reenter a symmetric phase. The symmetry recovery is enabled by the presence of accidental degeneracy points when the system has no loss, and each degeneracy point can spawn a pair of exceptional points when asymmetric loss is introduced. We perform microwave experiments to demonstrate the presence of the exceptional point and symmetry recovery. ; Comment: 24 pages, 14 figures