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Nanoelectronic thermometers optimised for sub-10 millikelvin operation

Research output: Contribution to Journal/MagazineJournal article

<mark>Journal publication date</mark>10/06/2015
Publication StatusPublished
<mark>Original language</mark>English


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.

Bibliographic note

11 pages, 4 figures. (Fixed fitted saturation T_e on p9)