Coherent Excited States in Superconductors due to a Microwave Field

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

doi:10.1103/PhysRevLett.117.047002

Coherent Excited States in Superconductors due to a Microwave Field

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

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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 language	English
Article number	047002
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review Letters
Volume	117
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.117.047002
Publication status	Published - 19 Jul 2016

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AB - 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.

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Coherent Excited States in Superconductors due to a Microwave Field

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