Phonon cooling of nanomechanical beams with tunnel junctions

Details Phonon cooling of nanomechanical beams with tunnel junctions Phonon cooling of nanomechanical beams with tunnel junctions

2009-01-19

arxiv.org/abs/0901.2895v2

Phys. Rev. Lett. 102, 165502 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.102.165502

We demonstrate electronic cooling of 1D phonon modes in suspended nanowires for the first time, using normal metal--insulator--superconductor (NIS) tunnel junctions. Simultaneous cooling of both electrons and phonons to a common temperature was achieved. In comparison with non-suspended devices, better cooling performance is achieved in the whole operating range of bath temperatures between 0.1-0.7 K. The observed low-temperature thermal transport characteristics are consistent with scattering of ballistic phonons at the nanowire-bulk contact as being the mechanism limiting thermal transport. At the lowest bath temperature of the experiment $\sim$ 100 mK, both phonons and electrons in the beam were cooled down to 42 mK, which is below the refrigerator bath temperature.

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