Microkelvin electronics on a pulse-tube cryostat with a gate Coulomb blockade thermometer

Samani, Mohammad and Scheller, Christian P. and Yurttagül, Nikolai and Grigoras, Kestutis and Gunnarsson, David and Sedeh, Omid Sharifi and Jones, Alexander T. and Prance, Jonathan R. and Haley, Richard P. and Prunnila, Mika and Zumbühl, Dominik M.. (2021) Microkelvin electronics on a pulse-tube cryostat with a gate Coulomb blockade thermometer. arxiv.

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Official URL: https://edoc.unibas.ch/95040/

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Access to lower temperatures has consistently enabled scientific breakthroughs. Pushing the limits of emph{on-chip} temperatures deep into the microkelvin regime would open the door to unprecedented quantum coherence, novel quantum states of matter, and also the discovery of unexpected phenomena. Adiabatic demagnetization is the workhorse of microkelvin cooling, requiring a dilution refrigerator precooling stage. Pulse-tube dilution refrigerators have grown enormously in popularity due to their vast experimental space and independence of helium, but their unavoidable vibrations are making microkelvin cooling very difficult. On-chip thermometry in this unexplored territory is also not a trivial task due to extreme sensitivity to noise. Here, we present a pulse-tube compatible microkelvin sample holder with on-board cooling and microwave filtering and introduce a new type of temperature sensor, the gate Coulomb blockade thermometer (gCBT), working deep into the microkelvin regime. Using on- and off-chip cooling, we demonstrate electronic temperatures as low as 224 ± 7 μ K, remaining below 300 μ K for 27 hours, thus providing sufficient time for measurements. Finally, we give an outlook for cooling below 50 μ K for a new generation of microkelvin transport experiments.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Zumbühl, Dominik M
Item Type:Preprint
Publisher:Cornell University
Note:Publication type according to Uni Basel Research Database: Discussion paper / Internet publication
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Last Modified:26 Jun 2023 08:13
Deposited On:26 Jun 2023 08:13

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