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RESEARCH PRODUCT
Electron refrigeration in hybrid structures with spin-split superconductors
F. S. BergeretF. S. BergeretTero T. HeikkiläMikel Roucosubject
Materials scienceelectron refrigerationta221FOS: Physical sciences02 engineering and technologyElectronsuperconductors01 natural sciences7. Clean energylaw.inventionsuprajohteetSuperconductivity (cond-mat.supr-con)lawrefrigerationCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciences010306 general physicsQuantum tunnellingSuperconductivityCouplingCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsta114Condensed Matter - SuperconductivityjäähdytysRefrigerationCoefficient of performanceCondensed Matter::Mesoscopic Systems and Quantum Hall Effect021001 nanoscience & nanotechnologyCondensed Matter::Strongly Correlated Electrons0210 nano-technologyElectron coolingVoltagedescription
Electron tunneling between superconductors and normal metals has been used for an efficient refrigeration of electrons in the latter. Such cooling is a nonlinear effect and usually requires a large voltage. Here we study the electron cooling in heterostructures based on superconductors with a spin-splitting field coupled to normal metals via spin-filtering barriers. The cooling power shows a linear term in the applied voltage. This improves the coefficient of performance of electron refrigeration in the normal metal by shifting its optimum cooling to lower voltage, and also allows for cooling the spin-split superconductor by reverting the sign of the voltage. We also show how tunnel coupling spin-split superconductors with regular ones allows for a highly efficient refrigeration of the latter.
year | journal | country | edition | language |
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2017-11-08 | Physical Review B |