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Vortex Motion in a Josephson Junction Induced by Phonon Injection

Coherent phonons or pulses of phonons give rise to potential wells moving with them, exerting a force on the array of vortices in the Josephson junction. These potential wells arise from the modulation of the maximum Josephson current density and of the other parameters of the tunnel junction due to a change in the thickness of the insulating barrier or a change in the magnitude of the order parameter by the phonons. If the counter force is small, the phonons can drag the vortices with them, that is, with the velocity of sound. We discuss this effect phenomenologically and show that phonons can induce the vortex motion under experimentally attainable conditions.