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)

Vol. 10 1 21961

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics

DOI

10.1038/s41598-020-78869-z

PubMed

33319817

More information

Latest update

1/8/2021 8