Efficient electron-refrigeration based on a normal-metal/spin-filter/superconductor junction is proposed and demonstrated theoretically. The spin-filtering effect leads to values of the cooling power much higher than in conventional normal-metal/nonmagnetic-insulator/superconductor coolers and allows for an efficient extraction of heat from the normal metal. We demonstrate that highly efficient cooling can be realized in both ballistic and diffusive multi-channel junctions in which the reduction of the electron temperature from 300 mK to around 50 mK can be achieved. Our results indicate the practical usefulness of spin-filters for efficiently cooling detectors, sensors, and quantum devices.
@article{arxiv.1307.2318,
title = {Efficient electron refrigeration using superconductor/spin-filter devices},
author = {Shiro Kawabata and Asier Ozaeta and Andrey S. Vasenko and Frank W. J. Hekking and F. Sebastian Bergeret},
journal= {arXiv preprint arXiv:1307.2318},
year = {2013}
}
Comments
5 pages, 3 figures, Appl. Phys. Lett. (2013) in press