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arXiv · 1505.07244

Nanoelectronic thermometers optimised for sub-10 millikelvin operation

J. R. Prance·D. I. Bradley·R. E. George·R. P. Haley·Yu. A. Pashkin·M. Sarsby·J. Penttilä·L. Roschier·D. Gunnarsson·H. Heikkinen·M. Prunnila
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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.

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J. R. Prance, D. I. Bradley, R. E. George, R. P. Haley, Yu. A. Pashkin, M. Sarsby, J. Penttilä, L. Roschier, D. Gunnarsson, H. Heikkinen, M. Prunnila. 2015-05-27. Nanoelectronic thermometers optimised for sub-10 millikelvin operation. https://doi.org/10.1038/ncomms10455

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