• Open Access

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

Mohammad Samani, Christian P. Scheller, Omid Sharifi Sedeh, Dominik M. Zumbühl, Nikolai Yurttagül, Kestutis Grigoras, David Gunnarsson, Mika Prunnila, Alexander T. Jones, Jonathan R. Prance, and Richard P. Haley
Phys. Rev. Research 4, 033225 – Published 19 September 2022

Abstract

Temperatures below 1 mK on-chip hold great potential for quantum physics but present a great challenge due to the lack of suitable thermometry and the detrimental pulse-tube vibrations of cryogen-free refrigerators. Here, we solve the pulse-tube problem using a rigidly wired metallic sample holder, which provides a microkelvin environment with low heat leaks despite the vibrations. Further, we demonstrate an improved type of temperature sensor, the gate Coulomb blockade thermometer (gCBT), employing a gate metallization covering the entire device. This immunizes against nanofabrication imperfections and uncontrollable offset charges, and extends the range to lower temperatures compared to a junction CBT with the same island capacitance, here down to 160 μK for a 10% accuracy. Using on- and off-chip cooling, we demonstrate electronic temperatures as low as 224 ±μK, remaining below 300 μK for 27 hours, thus providing time for experiments. Finally, we give an outlook for cooling below 50 μK for a future generation of microkelvin transport experiments.

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  • Received 28 October 2021
  • Accepted 24 July 2022
  • Corrected 13 October 2022

DOI:https://doi.org/10.1103/PhysRevResearch.4.033225

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Corrections

13 October 2022

Correction: The byline footnote indicating the equal contribution of the first and second authors was missing and has been inserted.

Authors & Affiliations

Mohammad Samani*,†, Christian P. Scheller*, Omid Sharifi Sedeh, and Dominik M. Zumbühl3,‡

  • Department of Physics, University of Basel, CH-4056 Basel, Switzerland

Nikolai Yurttagül, Kestutis Grigoras, David Gunnarsson§, and Mika Prunnila

  • VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT Espoo, Finland

Alexander T. Jones, Jonathan R. Prance, and Richard P. Haley

  • Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YB, United Kingdom

  • *These authors contributed equally to this work.
  • m@msamani.ca
  • dominik.zumbuhl@unibas.ch
  • §Present address: Bluefors Oy, Arinatie 10, 00370 Helsinki, Finland.

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Issue

Vol. 4, Iss. 3 — September - November 2022

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