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RESEARCH PRODUCT
Phonon Cooling of Nanomechanical Beams with Tunnel Junctions
P. J. KoppinenIlari Maasiltasubject
Range (particle radiation)Materials scienceCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsScatteringPhononCondensed Matter - SuperconductivityRefrigerator carNanowireFOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technologyElectronCondensed Matter::Mesoscopic Systems and Quantum Hall Effect021001 nanoscience & nanotechnology01 natural sciencesSuperconductivity (cond-mat.supr-con)Condensed Matter::Materials ScienceThermal transportCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciences010306 general physics0210 nano-technologyBeam (structure)description
We demonstrate electronic cooling of 1D phonon modes in suspended nanowires for the first time, using normal-metal-insulator-superconductor (N-I-S) tunnel junctions. Simultaneous cooling of both electrons and phonons to a common temperature was achieved. In comparison with nonsuspended 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 approximately 100 mK, both phonons and electrons in the beam were cooled down to 42 mK, which is below the refrigerator base temperature.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-01-19 | Physical Review Letters |