Nanoelectronic thermometers optimised for sub-10 millikelvin operation

Prance, J. R. and Bradley, D. I. and George, R. E. and Haley, R. P. and Pashkin, Yu A. and Sarsby, M. and Penttilä, J. and Roschier, L. and Gunnarsson, D. and Heikkinen, H. and Prunnila, M. (2015) Nanoelectronic thermometers optimised for sub-10 millikelvin operation. arxiv.org.

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Abstract

We report the cooling of electrons in nanoelectronic Coulomb blockade thermometers below 4 mK. Above 7 mK the devices are in good thermal contact with the environment, well isolated from electrical noise, and not susceptible to self-heating. This is attributed to an optimised design that incorporates cooling fins with a high electron-phonon coupling and on-chip electronic filters, combined with a low-noise electronic measurement setup. Below 7 mK the electron temperature is seen to diverge from the ambient temperature. 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.

Item Type:
Journal Article
Journal or Publication Title:
arxiv.org
Additional Information:
11 pages, 4 figures. (Fixed fitted saturation T_e on p9)
Subjects:
ID Code:
77061
Deposited By:
Deposited On:
17 Dec 2015 10:38
Refereed?:
No
Published?:
Published
Last Modified:
12 Jul 2020 05:23