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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

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

Résumé

We present a microscopic calculation of the nondissipative current through a superconducting quantum point contact coupled to a mechanical oscillator. Using the non-equilibrium 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.

Dates et versions

hal-00664434 , version 1 (30-01-2012)

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Rémi Avriller, F. S. Bergeret, Fabio Pistolesi. Detection of ultrafast oscillations in superconducting point contacts by means of supercurrent measurements. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 84 (19), pp.195415 (1-8). ⟨10.1103/PhysRevB.84.195415⟩. ⟨hal-00664434⟩

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