The performance of hybrid superconducting electronic coolers is usually limited by the accumulation of hot quasi-particles in the superconducting leads. This issue is all the more stringent in large-scale and high-power devices, as required by applications. Introducing a metallic drain connected to the superconducting electrodes via a fine-tuned tunnel barrier, we efficiently remove quasi-particles and obtain electronic cooling from 300 mK down to 130 mK with a 400 pW cooling power. A simple thermal model accounts for the experimental observations.
@article{arxiv.1304.1846,
title = {Trapping hot quasi-particles in a high-power superconducting electronic cooler},
author = {H. Q. Nguyen and T. Aref and V. J. Kauppila and M. Meschke and C. B. Winkelmann and H. Courtois and J. P. Pekola},
journal= {arXiv preprint arXiv:1304.1846},
year = {2014}
}