Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-10-31
Phys. Rev. B 79, 134511 (2009) [18 pages]
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
19 pages, 11 figures, published in PRB
Scientific paper
10.1103/PhysRevB.79.134511
We investigate a superconducting single-electron transistor capacitively coupled to a nanomechanical oscillator and focus on the double Josephson quasiparticle resonance. The existence of two coherent Cooper pair tunneling events is shown to lead to pronounced backaction effects. Measuring the current and the shot noise provides a direct way of gaining information on the state of the oscillator. In addition to an analytical discussion of the linear-response regime, we discuss and compare results of higher-order approximation schemes and a fully numerical solution. We find that cooling of the mechanical resonator is possible, and that there are driven and bistable oscillator states at low couplings. Finally, we also discuss the frequency dependence of the charge noise and the current noise of the superconducting single electron transistor.
Bruder Christoph
Doiron C. B.
Koerting V.
Schmidt Thomas L.
Trauzettel Björn
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