Detection of ultrafast oscillations in superconducting point contacts by means of supercurrent measurements
R. Avriller, F. S. Bergeret, F. Pistolesi
DOI 10.1103/PhysRevB.84.195415 · Physical Review B
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Abstract
We present a microscopic calculation of the nondissipative current through a superconducting quantum point contact coupled to a mechanical oscillator. Using the nonequilibrium Keldysh Green function approach, we determine the current-phase relation. The latter shows that at certain phases, the current is sharply suppressed. These dips in the current-phase relation provide information about the oscillating frequency and coupling strength of the mechanical oscillator. We also present an effective two-level model from which we obtain analytical expressions describing the position and width of the dips. Our findings are of relevance for nanomechanical resonators based on superconducting materials.
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