Nuclear demagnetisation cooling of a nanoelectronic device

Jones, Alex and Bradley, Ian and Guénault, Tony and Gunnarsson, David and Haley, Richard and Holt, Stephen and Pashkin, Yuri and Penttilä, Jari and Prance, Jonathan and Prunnila, Mika and Roschier, Leif (2017) Nuclear demagnetisation cooling of a nanoelectronic device. APS March Meeting 2017.

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Abstract

We present a new technique for on-chip cooling of electrons in a nanostructure: nuclear demagnetisation of on-chip, thin-film copper refrigerant. We are motivated by the potential improvement in the operation of nanoelectronic devices below 10 mK . At these temperatures, weak electron-phonon coupling hinders traditional cooling, yet here gives the advantage of thermal isolation between the environment and the on-chip electrons, enabling cooling significantly below the base temperature of the host lattice. To demonstrate this we electroplate copper onto the metallic islands of a Coulomb blockade thermometer (CBT), and hence provide a direct thermal link between the cooled copper nuclei and the device electrons. The CBT provides primary thermometry of its internal electron temperature, and we use this to monitor the cooling. Using an optimised demagnetisation profile we observe the electrons being cooled from 9 mK to 4 . 5 mK , and remaining below 5 mK for an experimentally useful time of 1200 seconds. We also suggest how this technique can be used to achieve sub- 1 mK electron temperatures without the use of elaborate bulk demagnetisation stages.

Item Type:
Journal Article
Journal or Publication Title:
APS March Meeting 2017
ID Code:
177983
Deposited By:
Deposited On:
24 Oct 2022 10:25
Refereed?:
No
Published?:
Published
Last Modified:
22 Nov 2022 11:59