Nicolí G, Märki P, Bräm B A, Röösli M P, Hennel S, Hofmann A, Reichl C, Wegscheider W, Ihn T, Ensslin K
Solid State Physics Laboratory, ETH Zürich, Otto-Stern-Weg 1, 8093 Zürich, Switzerland.
Rev Sci Instrum. 2019 Nov 1;90(11):113901. doi: 10.1063/1.5127830.
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 He immersion cell tight against superleaks, implement an innovative wiring technology, and develop optimized transport measurement procedures.
在几毫开尔文温度下进行的实验需要有效的热化方案、测量线路的低通滤波以及低噪声电子设备。在此，我们报告了对一台基础温度为3.5 mK的商用稀释制冷机所做的改进，这些改进使我们能够将电子温度降低至6.7 mK，该温度是通过对[Al]GaAs异质结构中量子点栅极定义的库仑峰宽度测量得到的。我们展示了一种紧密防止超漏的液氦浸没式样品池的设计与实现，采用了创新的布线技术，并开发了优化的输运测量程序。
