Nanoelectronic primary thermometry below 4 mK

Bradley, David Ian and George, Richard Edwin and Gunnarsson, David and Haley, Richard Peter and Heikkinen, Hannele and Pashkin, Yuri and Penttilä, J. and Prance, Jonathan Robert and Prunnila, Mika and Roschier, Leif and Sarsby, Matt (2016) Nanoelectronic primary thermometry below 4 mK. Nature Communications, 7. ISSN 2041-1723

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Abstract

Cooling nanoelectronic structures to millikelvin temperatures presents extreme challenges in maintaining thermal contact between the electrons in the device and an external cold bath. It is typically found that when nanoscale devices are cooled to ~10 mK the electrons are significantly overheated. Here we report the cooling of electrons in nanoelectronic Coulomb blockade thermometers below 4 mK. The low operating temperature is attributed to an optimized design that incorporates cooling fins with a high electron–phonon coupling and on-chip electronic filters, combined with low-noise electronic measurements. By immersing a Coulomb blockade thermometer in the 3He/4He refrigerant of a dilution refrigerator, we measure a lowest electron temperature of 3.7 mK and a trend to a saturated electron temperature approaching 3 mK. This work demonstrates how nanoelectronic samples can be cooled further into the low-millikelvin range.

Item Type: Journal Article
Journal or Publication Title: Nature Communications
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 78034
Deposited By: ep_importer_pure
Deposited On: 28 Jan 2016 13:34
Refereed?: Yes
Published?: Published
Last Modified: 14 Oct 2019 08:17
URI: https://eprints.lancs.ac.uk/id/eprint/78034

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