Nanoelectronic primary thermometry below 4 mK

D.I. Bradley, R.E. George, D. Gunnarsson, R.P. Haley, H. Heikkinen, Yu.A. Pashkin, J. Penttila, J.R. Prance (Corresponding Author), Mika Prunnila, L. Roschier (Corresponding Author), M. Sarsby

    Research output: Contribution to journalArticleScientificpeer-review

    29 Citations (Scopus)


    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 ~ 10mK 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 3He/4He refrigerant of a dilution refrigerator, we measure a lowest electron temperature of 3.7mK 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.
    Original languageEnglish
    Article number10455
    JournalNature Communications
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed


    • Molecular electronics
    • Nanoscience and technology


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