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Title

Detection of ultrafast oscillations in superconducting point contacts by means of supercurrent measurements

AuthorsAvriller, R.; Bergeret, F. S. CSIC ORCID; Pistolesi, F.
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review B 84(19): 195415 (2011)
AbstractWe 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. © 2011 American Physical Society.
URIhttp://hdl.handle.net/10261/50533
DOIhttp://dx.doi.org/10.1103/PhysRevB.84.195415
Identifiersdoi: 10.1103/PhysRevB.84.195415
issn: 1098-0121
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