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

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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2017-12-18
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Language
en
Pages
1-5
Series
Applied Physics Letters, Volume 111, issue 25
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 both the electronic leads 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 ± 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 μK nanoelectronics.
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Citation
Palma , M , Scheller , C P , Maradan , D , Feshchenko , A V , Meschke , M & Zumbühl , D M 2017 , ' On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK ' , Applied Physics Letters , vol. 111 , no. 25 , 253105 , pp. 1-5 . https://doi.org/10.1063/1.5002565