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IEEE Journal of Quantum Electronics

Superconductivity and macroscopic quantum phenomena or is a Josephson junction really just a two-level atom?

Daniel N. Rogovin

Published Sep 1, 1974• 0 citations
Publisher
DOI
10.1109/jqe.1974.1068353

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We develop a theoretical description of nonadiabatic Josephson dynamics in superconducting junctions containing low energy quasiparticles. Within this approach we investigate the effects of midgap states in junctions of unconventional d-wave superconductors. We identify a reentrance effect in the transition between thermal activation and macroscopic quantum tunneling, and connect this phenomenon to the experimental observations in Phys. Rev. Lett. 94, 087003 (2005). It is also shown that nonlinear Josephson dynamics can be defined by resonant interaction with midgap states reminiscent of nonlinear optical phenomena in media of two-level atoms.