Quantum dot thermometry at ultra-low temperature in a dilution refrigerator with a ${}^4$He immersion cell

Abstract

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.

arXiv comment9 pages, 5 figures

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Cited by in corpus (8)

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• Spin-Selective Equilibration among Integer Quantum Hall Edge Channels
• Measuring pulse heating in Si quantum dots with individual two-level fluctuators
• Dispersive detection of single microwave photons with quantum dots