Brownian refrigeration by hybrid tunnel junctions

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
144505/1-14
Series
Physical Review B, Volume 84, Issue 14
Abstract
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.
Description
Keywords
Brownian refrigeration, hybrid tunnel junctions, superconductors, electrodes, heat rectifying systems, single-electron transistors
Other note
Citation
Peltonen, J. T. & Helle, M. & Timofeev, A. V. & Solinas, P. & Hekking, F. W. J. & Pekola, Jukka. 2011. Brownian refrigeration by hybrid tunnel junctions. Physical Review B. Volume 84, Issue 14. 144505/1-14. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.84.144505.