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Resonance excitation of superconducting bound states in a tunnel junction by an electromagnetic field: Nonlinear response of the Josephson current

V. S. Shumeiko, G. Wendin, E. N. Bratus’

DOI 10.1103/PhysRevB.48.13129 · Physical Review B

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Abstract

We study the manifestations of superconducting current-induced bound states in the ac Josephson effect in tunnel contacts. Due to the normal elelctron backscattering by the contact, the bound states have a two-level structure, which allows direct interlevel transitions driven by an electromagnetic field introduced in the dielectric layer. We find substantial nonequilibrium suppression of the Josephson current, and nonlinear current oscillations induced by a resonant applied electromagnetic field.

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