Normal-Metal-Superconductor Tunnel Junction as a Brownian Refrigerator
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physical Review Letters, Volume 98, Issue 21
AbstractThermal noise generated by a hot resistor (resistance R) can, under proper conditions, catalyze heat removal from a cold normal metal (N) in contact with a superconductor (S) via a tunnel barrier (I). Such a NIS junction is reminiscent of Maxwell’s demon, rectifying the heat flow. Upon reversal of the temperature gradient between the resistor and the junction, the heat fluxes are reversed: this presents a regime which is not accessible in an ordinary voltage-biased NIS structure. We obtain analytical results for the cooling performance in an idealized high impedance environment and perform numerical calculations for general R. We conclude by assessing the experimental feasibility of the proposed effect.
normal-metal-superconductors, Brownian refrigerator, tunnel junctions, hot resistors, thermal noise, NIS structure
Pekola, Jukka & Hekking, F. W. J. 2007. Normal-Metal-Superconductor Tunnel Junction as a Brownian Refrigerator. Physical Review Letters. Volume 98, Issue 21. P. 210604/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.98.210604.