Detection of ultrafast oscillations in Superconducting Point-Contacts by means of Supercurrent Measurements

Details Detection of ultrafast oscillations in Superconducting Point-Contacts by means of Supercurrent Measurements Detection of ultrafast oscillations in Superconducting Point-Contacts by means of Supercurrent Measurements

2011-07-26

arxiv.org/abs/1107.5167v2

Phys. Rev. B 84, 195415 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 5 figures. Published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.84.195415

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.

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