A solid-state cooling principle based on magnetic-field-driven tunable suppression of Andreev reflection in superconductor/two-dimensional electron gas nanostructures is proposed. This cooling mechanism can lead to very large heat fluxes per channel up to 10^4 times greater than currently achieved with superconducting tunnel junctions. This efficacy and its availability in a two-dimensional electron system make this method of particular relevance for the implementation of quantum nanostructures operating at cryogenic temperatures.
@article{arxiv.cond-mat/0602643,
title = {Cooling electrons by magnetic-field tuning of Andreev reflection},
author = {F. Giazotto and F. Taddei and M. Governale and C. Castellana and R. Fazio and F. Beltram},
journal= {arXiv preprint arXiv:cond-mat/0602643},
year = {2007}
}