Record electron self-cooling in cold-electron bolometers with a hybrid superconductor-ferromagnetic nanoabsorber and traps
Journal article, 2020
The Cosmic Microwave Background (CMB) radiation is the only observable that allows studying the earliest stage of the Universe. Radioastronomy instruments for CMB investigation require low working temperatures around 100 mK to get the necessary sensitivity. On-chip electron cooling of receivers is a pathway for future space missions due to problems of dilution fridges at low gravity. Here, we demonstrate experimentally that in a Cold-Electron Bolometer (CEB) a theoretical limit of electron cooling down to 65 mK from phonon temperature of 300 mK can be reached. It is possible due to effective withdrawing of hot electrons from the tunnel barrier by double stock, special traps and suppression of Andreev Joule heating in hybrid Al/Fe normal nanoabsorber.
Author
A. V. Gordeeva
Nizhny Novgorod State Technical University
Russian Academy of Sciences
A. L. Pankratov
Nizhny Novgorod State Technical University
Russian Academy of Sciences
N. G. Pugach
National Research University Higher School of Economics
Moscow State University
Andrey Vasenko
National Research University Higher School of Economics
Donostia International Physics Center
V. O. Zbrozhek
Nizhny Novgorod State Technical University
A. V. Blagodatkin
Nizhny Novgorod State Technical University
D. A. Pimanov
Nizhny Novgorod State Technical University
Leonid Kuzmin
Nizhny Novgorod State Technical University
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Scientific Reports
2045-2322 (ISSN) 20452322 (eISSN)
Vol. 10 1 21961Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1038/s41598-020-78869-z
PubMed
33319817