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Quantum dot thermometry at ultra-low temperature in a dilution refrigerator with a 4He immersion cell.

Giorgio NicolíPeter MärkiB A BrämMarc P RöösliS HennelA HofmannC ReichlW WegscheiderT IhnK Ensslin
Published in: The Review of scientific instruments (2019)
Experiments performed at a temperature of a few millikelvins require effective thermalization schemes, low-pass filtering of the measurement lines, and low-noise electronics. Here, we report on the modifications to a commercial dilution refrigerator with a base temperature of 3.5 mK that enable us to lower the electron temperature to 6.7 mK measured from the Coulomb peak width of a quantum dot gate-defined in an [Al]GaAs heteostructure. We present the design and implementation of a liquid 4He immersion cell tight against superleaks, implement an innovative wiring technology, and develop optimized transport measurement procedures.
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