Superconductivity in the presence of microwaves: Full phase diagram

We address the problem of nonequilibrium superconductivity in the presence of microwave irradiation. Using contemporary analytical methods, we refine the old Eliashberg theory and generalize it to arbitrary temperatures T and frequencies ω. Microwave radiation is shown to stimulate superconductivity...

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Bibliographic Details
Published in:Physical review. B 2018-05, Vol.97 (18), Article 184516
Main Authors: Tikhonov, K. S., Skvortsov, M. A., Klapwijk, T. M.
Format: Article
Language:English
Subjects:
Critical current (superconductivity)
Irradiation
Microwaves
Phase diagrams
Superconductivity
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Summary:We address the problem of nonequilibrium superconductivity in the presence of microwave irradiation. Using contemporary analytical methods, we refine the old Eliashberg theory and generalize it to arbitrary temperatures T and frequencies ω. Microwave radiation is shown to stimulate superconductivity in a bounded region in the (ω,T) plane. In particular, for T3.3kBTc superconductivity is always suppressed by a weak ac driving. We also study the supercurrent in the presence of microwave irradiation and establish the criterion for the critical current enhancement. Our results can be qualitatively interpreted in terms of the interplay between the kinetic (“stimulation” vs “heating”) and spectral (“depairing”) effects of the microwaves.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.184516