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Microwave response of an NS ring coupled to a superconducting resonator

Microwave response of an NS ring coupled to a superconducting resonator,F. Chiodi,M. Ferrier,K. Tikhonov,P. Virtanen,T. T. Heikkilä,M. Feigelman,S. Gu

Microwave response of an NS ring coupled to a superconducting resonator  
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A long phase coherent normal (N) wire between superconductors (S) is characterized by a dense phase dependent Andreev spectrum . We probe this spectrum in a high frequency phase biased configuration, by coupling an NS ring to a multimode superconducting resonator. We detect a dc flux and frequency dependent response whose dissipative and non dissipative components are related by a simple Debye relaxation law with a characteristic time of the order of the diffusion time through the N part of the ring. The flux dependence exhibits $h/2e$ periodic oscillations with a large harmonics content at temperatures where the Josephson current is purely sinusoidal. This is explained considering that the populations of the Andreev levels are frozen on the time-scale of the experiments.
Published in 2010.
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