Quantum dot thermometry at ultra-low temperature in a dilution refrigerator with a $^4$He immersion cell
| Autor: | Nicolí, Giorgio, Märki, Peter, Bräm, Beat A., Röösli, Marc P., Hennel, Szymon, Hofmann, Andrea, Reichl, Christian, Wegscheider, Werner, Ihn, Thomas, Ensslin, Klaus |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Rev. Sci. Instr. 90, 113901 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.5127830 |
| Popis: | Experiments performed at a temperature of a few millikelvin 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 $^4$He immersion cell tight against superleaks, implement an innovative wiring technology and develop optimized transport measurement procedures. Comment: 9 pages, 5 figures |
| Databáze: | arXiv |
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