Thermal and Electrical Performance Study of Cold-Finger ³he Cryostat in Precision Measurement of Quantum Hall Resistance and Single-Electron Current

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
Series
IEEE Transactions on Instrumentation and Measurement, Volume 70
Abstract
The performance of our newly constructed cold-finger cryostat is investigated for quantum Hall resistance (QHR) and single-electron pump (SEP) devices. The cryostat features a vacuum-sealed sample chamber (SC) attached to a 0.3 K plate inside the inner vacuum can. The SC is designed to accommodate both the SEP and the QHR devices with a shielding partition between them. The measured QHR in the chamber approaches the nominal value for filling factor 2 within 20 parts in 109. The white-noise level of the SEP module, as obtained from the Allan deviation data, is 4.5 fA/ √ Hz. We also investigated the thermometry of the SC either under vacuum or filled with 3He gas. We calculated the thermal conductivity of the different heat conduction channels in the sample holder and found the dominant channel to be through the chip carriers not signal lines.
Description
Keywords
Cryogenics, current measurement, electrical resistance measurement, measurement uncertainty, quantum dots (QDs), thermal conductivity, thermometers
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Citation
Ghee , Y S , Kim , W S , Chae , D H , Kim , B K , Muhojoki , J , Bae , M H & Kim , N 2021 , ' Thermal and Electrical Performance Study of Cold-Finger ³he Cryostat in Precision Measurement of Quantum Hall Resistance and Single-Electron Current ' , IEEE Transactions on Instrumentation and Measurement , vol. 70 , 9280430 . https://doi.org/10.1109/TIM.2020.3041820