Effect of on-chip filter on Coulomb blockade thermometer

Coulomb Blockade Thermometer (CBT) is a primary thermometer based on electric conductance of normal tunnel junction arrays. One limitation for CBT use at the lowest temperatures has been due to environmental noise heating. To improve on this limitation, we have done measurements on CBT sensors fabri...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.400 (5), p.52029-4
Main Authors: Roschier, L, Gunnarsson, D, Meschke, M, Savin, A, Penttilä, J S, Prunnila, M
Format: Article
Language:English
Subjects:
Background noise
Blocking
Constraining
Coulomb friction
Dilution
Filtering
Filtration
Physics
Sensors
Thermometers
Tunnel junctions
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Summary:Coulomb Blockade Thermometer (CBT) is a primary thermometer based on electric conductance of normal tunnel junction arrays. One limitation for CBT use at the lowest temperatures has been due to environmental noise heating. To improve on this limitation, we have done measurements on CBT sensors fabricated with different on-chip filtering structures in a dilution refrigerator with a base temperature of 10 mK. The CBT sensors were produced with a wafer scale tunnel junction process. We present how the different on-chip filtering schemes affect the limiting saturation temperatures and show that CBT sensors with proper on-chip filtering work at temperatures below 20 mK and are tolerant to noisy environment.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/400/5/052029