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

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.

4 pages, 3 color figures

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Cited by in corpus (11)

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• Coulomb blockade thermometry beyond the universal regime
• On-chip quantum confinement refrigeration overcoming electron-phonon heat leaks
• Sub-10 mK "In-cell" Magnetic Refrigeration for Cryogen-free Cryostats
• Dominant end-tunneling effect in two distinct Luttinger liquids coexisting in one quantum wire
• Effectiveness of Some 0 dB Cryogenic Microwave Attenuators as Thermal Heatsinks
• Exploring Quantum Hall Physics at Ultra-Low Temperatures and at High Pressures
• Influence of device non-uniformities on the accuracy of Coulomb blockade thermometry
• Coulomb Blockade Thermometry on a Wide Temperature Range