Nanoelectronic primary thermometry below 4 mK

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

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)

    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 ~ 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
    Volume7
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Thermometry
    Nanoelectronics
    temperature measurement
    Electrons
    Coulomb blockade
    Thermometers
    Electron temperature
    thermometers
    Cooling
    cooling fins
    electronic filters
    Temperature
    electrons
    chips (electronics)
    electron energy
    cooling
    Fins (heat exchange)
    refrigerants
    Refrigerators
    refrigerators

    Keywords

    • Molecular electronics
    • Nanoscience and technology

    Cite this

    Bradley, D. I., George, R. E., Gunnarsson, D., Haley, R. P., Heikkinen, H., Pashkin, Y. A. A., ... Sarsby, M. (2016). Nanoelectronic primary thermometry below 4 mK. Nature Communications, 7, [10455]. https://doi.org/10.1038/ncomms10455
    Bradley, D.I. ; George, R.E. ; Gunnarsson, D. ; Haley, R.P. ; Heikkinen, H. ; Pashkin, Y.A.a ; Penttila, J. ; Prance, J.R. ; Prunnila, M. ; Roschier, L. ; Sarsby, M. / Nanoelectronic primary thermometry below 4 mK. In: Nature Communications. 2016 ; Vol. 7.
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    Bradley, DI, George, RE, Gunnarsson, D, Haley, RP, Heikkinen, H, Pashkin, YAA, Penttila, J, Prance, JR, Prunnila, M, Roschier, L & Sarsby, M 2016, 'Nanoelectronic primary thermometry below 4 mK', Nature Communications, vol. 7, 10455. https://doi.org/10.1038/ncomms10455

    Nanoelectronic primary thermometry below 4 mK. / Bradley, D.I.; George, R.E.; Gunnarsson, D.; Haley, R.P.; Heikkinen, H.; Pashkin, Y.A.a; Penttila, J.; Prance, J.R. (Corresponding Author); Prunnila, M.; Roschier, L. (Corresponding Author); Sarsby, M.

    In: Nature Communications, Vol. 7, 10455, 2016.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Bradley, D.I.

    AU - George, R.E.

    AU - Gunnarsson, D.

    AU - Haley, R.P.

    AU - Heikkinen, H.

    AU - Pashkin, Y.A.a

    AU - Penttila, J.

    AU - Prance, J.R.

    AU - Prunnila, M.

    AU - Roschier, L.

    AU - Sarsby, M.

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    AB - 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.

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    Bradley DI, George RE, Gunnarsson D, Haley RP, Heikkinen H, Pashkin YAA et al. Nanoelectronic primary thermometry below 4 mK. Nature Communications. 2016;7. 10455. https://doi.org/10.1038/ncomms10455