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arXiv · 1708.09491

On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK

M. Palma·C. P. Scheller·D. Maradan·A. V. Feshchenko·M. Meschke·D. M. Zumbühl
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Abstract

Cooling nanoelectronic devices below 10 mK is a great challenge since thermal conductivities become very small, thus creating a pronounced sensitivity to heat leaks. Here, we overcome these difficulties by using adiabatic demagnetization of \emph{both} the electronic leads \emph{and} the large metallic islands of a Coulomb blockade thermometer. This reduces the external heat leak through the leads and also provides on-chip refrigeration, together cooling the thermometer down to 2.8$\pm$0.1 mK. We present a thermal model which gives a good qualitative account and suggests that the main limitation is heating due to pulse tube vibrations. With better decoupling, temperatures below 1 mK should be within reach, thus opening the door for microkelvin nanoelectronics.

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M. Palma, C. P. Scheller, D. Maradan, A. V. Feshchenko, M. Meschke, D. M. Zumbühl. 2017-08-30. On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK. https://doi.org/10.1063/1.5002565

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