Optimized Proximity Thermometer for Ultrasensitive Detection

Bayan Karimi*, Danilo Nikolic, Tuomas Tuukkanen, Joonas T. Peltonen, Wolfgang Belzig, Jukka P. Pekola

*Corresponding author for this work

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Abstract

We present a set of experiments to optimize the performance of a 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 are tested. We develop a theoretical model based on Usadel equations and dynamic Coulomb blockade that reproduces the measured results and yields a tool to calibrate the thermometer and to optimize it further in future experiments. We also propose an analytic formula that reproduces the experimental data for a wide range of temperatures.

Original languageEnglish
Article number054001
Number of pages7
JournalPhysical Review Applied
Volume13
Issue number5
DOIs
Publication statusPublished - 1 May 2020
MoE publication typeA1 Journal article-refereed

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