Coherent excited states in superconductors due to a microwave field

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 ${\omega }_0$, steps at multiples of the photon energy $\Delta \pm n\hslash {\omega }_0$ 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.

References in corpus (3)

• Reduction of Dissipative Nonlinear Conductivity of Superconductors by Static and Microwave Magnetic Fields
• Transport properties of a two-dimensional electron gas dressed by light
• Theory of microwave-assisted supercurrent in quantum point contacts

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