Transport properties of a superconducting single-electron transistor coupled to a nanomechanical oscillator

2008/10/31 by V. Koerting, Thomas L. Schmidt, T. L. Schmidt +5
Physics and Astronomy · #Bistability #Computer science #Condensed matter physics #Cooper pair #Coulomb blockade #Force Microscopy Techniques and Applications #Josephson effect #Mechanical and Optical Resonators #Noise (video) #Optoelectronics #Physics #Quantum and electron transport phenomena #Quantum mechanics #Quantum tunnelling #Quasiparticle #Resonance (particle physics) #Resonator #Shot noise #Superconductivity #Transistor #Vackář oscillator #Voltage #Voltage-controlled oscillator #cond-mat.mes-hall #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.79.134511

published as Phys. Rev. B 79, 134511 (2009) [18 pages] · 19 pages, 11 figures, published in PRB

openalex publication_date 2009/04/09 · arxiv created 2009/05/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

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 back action 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.

Citations

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