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arXiv · 1911.02844

Optimized proximity thermometer for ultra-sensitive detection

Bayan Karimi·Danilo Nikolic·Tuomas Tuukkanen·Joonas T. Peltonen·Wolfgang Belzig·Jukka P. Pekola
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Abstract

We present a set of experiments to optimize the performance of the noninvasive thermometer based on proximity superconductivity. Current through a standard tunnel junction between an aluminum superconductor and a copper electrode is controlled by the strength of the proximity induced to this normal metal, which in turn is determined by the position of a direct superconducting contact from the tunnel junction. Several devices with different distances were tested. We develop a theoretical model based on Usadel equations and dynamic Coulomb blockade which reproduces the measured results and yields a tool to calibrate the thermometer and to optimize it further in future experiments.

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Bayan Karimi, Danilo Nikolic, Tuomas Tuukkanen, Joonas T. Peltonen, Wolfgang Belzig, Jukka P. Pekola. 2019-11-07. Optimized proximity thermometer for ultra-sensitive detection. https://doi.org/10.1103/physrevapplied.13.054001

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