Radio-Frequency Coulomb-Blockade Thermometry

We present a scheme and demonstrate measurements of a Coulomb-blockade thermometer (CBT) in a microwave-transmission setup. The sensor is embedded in an LCR resonator, where R is determined by the conductance of the junction array of the CBT. A transmission measurement yields a signal that is directly proportional to the conductance of the CBT, thus enabling the calibration-free operation of the thermometer. This is verified by measuring an identical sensor simultaneously in the usual dc setup. The important advantage of the rf measurement is its speed: the whole bias dependence of the CBT conductance can now be measured in a time of about 100 ms, which is 1000 times faster than in a standard dc measurement. The achieved noise-equivalent temperature of this rf primary measurement is about 1mK/Hz at the bath temperature T=200mK.

Description

Funding Information: This work was supported by Academy of Finland Grant No. 312057 (QTF Centre of Excellence) and by the European Metrology Programme for Innovation and Research (EMPIR) program co-financed by the Participating States and by the European Union Horizon 2020 research and innovation program. We acknowledge the provision of facilities and technical support by Aalto University at the OtaNano—Micronova Nanofabrication Center and through the low temperature laboratory (LTL) infrastructure, which is part of the EU Horizon 2020 European Microkelvin Platform (EMP), No. 824109. Publisher Copyright: © 2022 American Physical Society.

DOI

10.1103/PhysRevApplied.17.L011003

Citation

Blanchet , F , Chang , Y C , Karimi , B , Peltonen , J T & Pekola , J P 2022 , ' Radio-Frequency Coulomb-Blockade Thermometry ' , Physical Review Applied , vol. 17 , no. 1 , L011003 , pp. 1-5 . https://doi.org/10.1103/PhysRevApplied.17.L011003

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202203032074

Collections

[article-cris] Perustieteiden korkeakoulu / SCI

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