On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK
Finna-arvio
On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK
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.
Tallennettuna:
Kieli |
englanti |
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Sarja | Applied Physics Letters |
ISSN |
0003-6951 1077-3118 |
DOI | 10.1063/1.5002565 |