Ground-State Cooling of a Mechanical Oscillator by Interference in Andreev Reflection

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Physical Review Letters. 2016, 117, 197202. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.117.197202
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We study the ground-state cooling of a mechanical oscillator linearly coupled to the charge of a quantum dot inserted between a normal metal and a superconducting contact. Such a system can be realized, e.g., by a suspended carbon nanotube quantum dot with a capacitive coupling to a gate contact. Focusing on the subgap transport regime, we analyze the inelastic Andreev reflections which drive the resonator to a nonequilibrium state. For small coupling, we obtain that vibration-assisted reflections can occur through two distinct interference paths. The interference determines the ratio between the rates of absorption and emission of vibrational energy quanta. We show that ground-state cooling of the mechanical oscillator can be achieved for many of the oscillator's modes simultaneously or for single modes selectively, depending on the experimentally tunable coupling to the superconductor.

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ISO 690STADLER, Pascal, Wolfgang BELZIG, Gianluca RASTELLI, 2016. Ground-State Cooling of a Mechanical Oscillator by Interference in Andreev Reflection. In: Physical Review Letters. 2016, 117, 197202. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.117.197202
BibTex
@article{Stadler2016Groun-35901,
  year={2016},
  doi={10.1103/PhysRevLett.117.197202},
  title={Ground-State Cooling of a Mechanical Oscillator by Interference in Andreev Reflection},
  volume={117},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Stadler, Pascal and Belzig, Wolfgang and Rastelli, Gianluca},
  note={This research was supported by the Zukunftskolleg of the University of Konstanz and by the DFG through the collaborative research center SFB 767 Article Number: 197202}
}
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This research was supported by the Zukunftskolleg of the University of Konstanz and by the DFG through the collaborative research center SFB 767
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