Brownian refrigeration by hybrid tunnel junctions

Details Brownian refrigeration by hybrid tunnel junctions Brownian refrigeration by hybrid tunnel junctions

2011-04-29

arxiv.org/abs/1104.5623v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 16 figures

Scientific paper

Voltage fluctuations generated in a hot resistor can cause extraction of heat from a colder normal metal electrode of a hybrid tunnel junction between a normal metal and a superconductor. We extend the analysis presented in [Phys. Rev. Lett. 98, 210604 (2007)] of this heat rectifying system, bearing resemblance to a Maxwell's demon. Explicit analytic calculations show that the entropy of the total system is always increasing. We then consider a single electron transistor configuration with two hybrid junctions in series, and show how the cooling is influenced by charging effects. We analyze also the cooling effect from nonequilibrium fluctuations instead of thermal noise, focusing on the shot noise generated in another tunnel junction. We conclude by discussing limitations for an experimental observation of the effect.

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