3 years ago

The contribution of microwaves to the Cooper-pair condensate of a superconductor in the presence of inelastic processes.

Alexander V Semenov, Marc P Westig, Igor A Devyatov, Teunis M Klapwijk

We analyse theoretically the influence of inelastic processes on coherent excited states of a superconductor generated by the application of microwaves. These states were identified recently [Phys. Rev. Lett. 117, 047002 (2016)] as the source of resonance frequency shift in microwave superconducting micro-resonators at low temperatures where the quasiparticle density is negligible. As a convenient model we use a thin dirty superconducting strip in contact with a diffuse normal metallic reservoir through an opaque tunnel junction and calculate analytically both the spectral functions and the non-equilibrium distribution function in the presence of a monochromatic microwave signal. We demonstrate that in the quantum mode of depairing, when the frequency of the microwave signal is much larger than the normalised signal amplitude, but much less than the modulus of a superconductor order parameter, the change of the kinetic inductance is determined primarily by the change of the spectral functions. We propose an experimental system to measure the spectral functions as well as the non-equilibrium distribution function using a non-invasive tunnel-junction on a microwave-driven superconducting wire.

Publisher URL: http://arxiv.org/abs/1801.03311

DOI: arXiv:1801.03311v1

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