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Phys. Rev. Lett. 102, 200801 (2009) [4 pages]

Electronic Refrigeration at the Quantum Limit

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Andrey V. Timofeev1,2, Meri Helle1, Matthias Meschke1, Mikko Möttönen1,3,4, and Jukka P. Pekola1
1Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 3500, 02015 TKK, Finland
2Laboratory of Superconductivity, Institute of Solid State Physics, Chernogolovka, 142432 Russia
3Department of Applied Physics, Helsinki University of Technology, P.O. Box 5100, 02015 TKK, Finland
4Australian Research Council Centre of Excellence for Quantum Computer Technology, The University of New South Wales, Sydney 2052, Australia

Received 14 February 2009; published 18 May 2009

We demonstrate quantum-limited electronic refrigeration of a metallic island in a low-temperature microcircuit. We show that matching the impedance of the circuit enables refrigeration at a distance, of about 50  μm in our case, through superconducting leads with a cooling power determined by the quantum of thermal conductance. In a reference sample with a mismatched circuit this effect is absent. Our results are consistent with the concept of electromagnetic heat transport. We observe and analyze the crossover between electromagnetic and quasiparticle heat flux in a superconductor.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.200801
DOI:
10.1103/PhysRevLett.102.200801
PACS:
07.20.Mc, 72.15.Eb
 
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