Coherent Excited States in Superconductors due to a Microwave Field

A. V. Semenov, I. A. Devyatov, P. J. De Visser, T. M. Klapwijk

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
49 Downloads (Pure)

Abstract

We describe theoretically the depairing effect of a microwave field on diffusive s-wave superconductors. The ground state of the superconductor is altered qualitatively in analogy to the depairing due to a dc current. In contrast to dc depairing, the density of states acquires, for microwaves with frequency ω0, steps at multiples of the photon energy Δ±n ω0 and shows an exponential-like tail in the subgap regime. We show that this ac depairing explains the measured frequency shift of a superconducting resonator with microwave power at low temperatures.

Original languageEnglish
Article number047002
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Volume117
Issue number4
DOIs
Publication statusPublished - 19 Jul 2016

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