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Bradley DI, George RE, Gunnarsson D, et al. Nanoelectronic primary thermometry below 4 mK. Nat Commun. 2016;7:10455doi: 10.1038/ncomms10455.
Bradley, D. I., George, R. E., Gunnarsson, D., Haley, R. P., Heikkinen, H., Pashkin, Y. A., Penttilä, J., Prance, J. R., Prunnila, M., Roschier, L., & Sarsby, M. (2016). Nanoelectronic primary thermometry below 4 mK. Nature communications, 710455. https://doi.org/10.1038/ncomms10455
Bradley, D I, et al. "Nanoelectronic primary thermometry below 4 mK." Nature communications vol. 7 (2016): 10455. doi: https://doi.org/10.1038/ncomms10455
Bradley DI, George RE, Gunnarsson D, Haley RP, Heikkinen H, Pashkin YA, Penttilä J, Prance JR, Prunnila M, Roschier L, Sarsby M. Nanoelectronic primary thermometry below 4 mK. Nat Commun. 2016 Jan 27;7:10455. doi: 10.1038/ncomms10455. PMID: 26816217; PMCID: PMC4737845.
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Nat Commun. 2016 Jan 27;7:10455. doi: 10.1038/ncomms10455.

Nanoelectronic primary thermometry below 4 mK.

Nature communications

D I Bradley, R E George, D Gunnarsson, R P Haley, H Heikkinen, Yu A Pashkin, J Penttilä, J R Prance, M Prunnila, L Roschier, M Sarsby

Affiliations

  1. Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YB, UK.
  2. VTT Technical Research Centre of Finland, P.O. Box 1000, 02044 VTT Espoo, Finland.
  3. Lebedev Physical Institute, Moscow 119991, Russia.
  4. Aivon Oy, Valimotie 13A, 00380 Helsinki, Finland.

PMID: 26816217 PMCID: PMC4737845 DOI: 10.1038/ncomms10455

Abstract

Cooling nanoelectronic structures to millikelvin temperatures presents extreme challenges in maintaining thermal contact between the electrons in the device and an external cold bath. It is typically found that when nanoscale devices are cooled to ∼ 10 mK the electrons are significantly overheated. Here we report the cooling of electrons in nanoelectronic Coulomb blockade thermometers below 4 mK. The low operating temperature is attributed to an optimized design that incorporates cooling fins with a high electron-phonon coupling and on-chip electronic filters, combined with low-noise electronic measurements. By immersing a Coulomb blockade thermometer in the (3)He/(4)He refrigerant of a dilution refrigerator, we measure a lowest electron temperature of 3.7 mK and a trend to a saturated electron temperature approaching 3 mK. This work demonstrates how nanoelectronic samples can be cooled further into the low-millikelvin range.

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