Effects of Charging Energy on SINIS Tunnel Junction Thermometry

We have investigated theoretically the effects of the charging energy to the normal metal–insulator–superconductor (NIS) tunnel junction used as a thermometer. We demonstrate by numerical calculations how the charging effects modify NIS thermometry, and how the voltage-to-temperature response and th...

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Bibliographic Details
Published in:Journal of low temperature physics 2009-03, Vol.154 (5-6), p.179-189
Main Authors: Koppinen, P. J., Kühn, T., Maasilta, I. J.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Charging
Condensed Matter Physics
Energy use
Low temperature physics
Magnetic Materials
Magnetism
Mathematical analysis
Physics
Physics and Astronomy
Thermometers
Tunnel junctions
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Summary:We have investigated theoretically the effects of the charging energy to the normal metal–insulator–superconductor (NIS) tunnel junction used as a thermometer. We demonstrate by numerical calculations how the charging effects modify NIS thermometry, and how the voltage-to-temperature response and the responsivity |d V /d T | of a current biased thermometer are affected. In addition, we show that the responsivity of the thermometer can be modulated with an additional gate electrode. The maximum responsivity is achieved when the Coulomb blockade is maximal, i.e. with a closed gate.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-009-9861-7