Superconducting atomic contacts under microwave irradiation

Details Superconducting atomic contacts under microwave irradiation Superconducting atomic contacts under microwave irradiation

2006-08-29

arxiv.org/abs/cond-mat/0608648v1

Physical Review Letters 97 (2006) 067006

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.97.067006

We have measured the effect of microwave irradiation on the dc current-voltage characteristics of superconducting atomic contacts. The interaction of the external field with the ac supercurrents leads to replicas of the supercurrent peak, the well known Shapiro resonances. The observation of supplementary fractional resonances for contacts containing highly transmitting conduction channels reveals their non-sinusoidal current-phase relation. The resonances sit on a background current which is itself deeply modified, as a result of photon assisted multiple Andreev reflections. The results provide firm support for the full quantum theory of transport between two superconductors based on the concept of Andreev bound states.

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