Cooling of a suspended nanowire by an AC Josephson current flow

Details Cooling of a suspended nanowire by an AC Josephson current flow Cooling of a suspended nanowire by an AC Josephson current flow

2010-02-05

arxiv.org/abs/1002.1207v2

Phys. Rev. Lett. 104, 226802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.104.226802

We consider a nanoelectromechanical Josephson junction, where a suspended nanowire serves as a superconducting weak link, and show that an applied DC bias voltage an result in suppression of the flexural vibrations of the wire. This cooling effect is achieved through the transfer of vibronic energy quanta first to voltage driven Andreev states and then to extended quasiparticle electronic states. Our analysis, which is performed for a nanowire in the form of a metallic carbon nanotube and in the framework of the density matrix formalism, shows that such self-cooling is possible down to a level where the average occupation number of the lowest flexural vibration mode of the nanowire is $\sim 0.1$.

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