Observation of a radiation-induced soliton resonance in a Josephson ring

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Abstract
An experimental study of single-soliton dynamics in a ring-shaped Josephson junction is reported. An externally applied magnetic field H forms a harmonic potential for a soliton in the ring. The revolution of the soliton in the junction leads to a potential-induced emission of plasma waves, which give rise to a resonance at a certain soliton velocity. This behavior agrees with numerical simulations, which indicate locking of the soliton to the radiation frequency. Good agreement between the experiment, kinematic model, and numerical simulations is found.