Superconductivity in the presence of microwaves: Full phase diagram

Abstract

We address the problem of non-equilibrium superconductivity in the presence of microwave irradiation. We refine the old Eliashberg theory and generalize it to arbitrary temperatures $T$ and frequencies $\omega$. Microwave radiation is shown to stimulate superconductivity in a bounded region in the $(\omega ,T)$ plane. In particular, for $T<0.47T_c$ and for $\hslash \omega >3.3k_B{T}_c$ superconductivity is always suppressed by a weak \emph{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.

References in corpus (5)

• The Higgs Mode in Disordered Superconductors Close to a Quantum Phase Transition
• Amplitude Higgs mode and admittance in superconductors with a moving condensate
• Linear AC Response of Diffusive SNS Junctions
• Mesoscopic fluctuations of the supercurrent in diffusive Josephson junctions
• Admittance of a long diffusive SNS junction

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• Periodic dynamics in superconductors induced by an impulsive optical quench
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• Cavity Higgs-Polaritons
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• Cavity engineering of Hubbard $U$ via phonon polaritons
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• Emergence of Charge-Imbalanced BCS State and Suppression of Nonequilibrium FFLO State in Asymmetric NSN Junctions