Nanoelectronic primary thermometry below 4 millikelvin

Sarsby, Matthew and Haley, Richard and Bradley, David Ian and George, Richard and Pashkin, Yuri and Prance, Jonathan and Gunnarsson, David and Heikkinen, Hannele and Prunnila, Mika and Jari, Penttilä and Roschier, Leif (2016) Nanoelectronic primary thermometry below 4 millikelvin. APS March Meeting 2016.

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We present measurements of nanoelectronic Coulomb Blockade Thermometers that are optimised for operation below 10 mK. Their design incorporates on-chip electronic filters and cooling fins with a high electron-phonon coupling. By immersing the devices in the 3He/4He mixture of a dilution refrigerator, and by minimising electrical noise in the measurement circuit, the on-chip electron temperature reaches a value of 3.7 mK, the lowest yet measured in any nanoelectronic device. Above 7 mK the devices are in good thermal contact with their environment and are not susceptible to self-heating. Below 7 mK the device continues to provide accurate thermometry of the on-chip electron temperature, which is seen to diverge from the ambient temperature. In this regime the device provides valuable information about noise and heat-leaks from the environment, which points the way towards cooling nanoelectronic structures to lower temperatures.

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Journal Article
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APS March Meeting 2016
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24 Oct 2022 10:15
Last Modified:
11 Sep 2023 23:29