Abstract
On-chip demagnetization refrigeration has recently emerged as a powerful tool for reaching microkelvin electron temperatures in nanoscale structures. The relative importance of cooling on-chip and off-chip components and the thermal subsystem dynamics are yet to be analyzed. We study a Coulomb blockade thermometer with on-chip copper refrigerant both experimentally and numerically, showing that dynamics in this device are captured by a first-principles model. Our work shows how to simulate thermal dynamics in devices down to microkelvin temperatures, and outlines a recipe for a low-investment platform for quantum technologies and fundamental nanoscience in this novel temperature range.
| Original language | English |
|---|---|
| Article number | 077001 |
| Journal | Physical Review Letters |
| Volume | 131 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 18 Aug 2023 |
| MoE publication type | A1 Journal article-refereed |
Funding
The simulation codes can be obtained from the corresponding author upon reasonable request. This research is supported by the U.K. EPSRC (No. EP/K01675X/1, No. EP/N019199/1, No. EP/P024203/1, No. EP/L000016/1, and No. EP/W015730/1), the European FP7 Programme MICROKELVIN (No. 228464), the European Union’s Horizon 2020 research and innovation programme (European Microkelvin Platform 824109, and EFINED 766853), by the Academy of Finland through the Centre of Excellence program (Projects No. 336817 and No. 312294), and by Business Finland through QuTI-project (No. 40562/31/2020). S. A. acknowledges financial support from the Jenny and Antti Wihuri Foundation via the Council of Finnish Foundations. M. D. T acknowledges financial support from the Royal Academy of Engineering (No. RF/201819/18/2). Yu. A. P. acknowledges support from the QSHS project ST/T006102/1 funded by STFC.
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