Optimized Proximity Thermometer for Ultrasensitive Detection

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.

Description

| openaire: EC/H2020/766025/EU//QuESTech | openaire: EC/H2020/742559/EU//SQH

Keywords

TRANSPORT

DOI

10.1103/PhysRevApplied.13.054001

Citation

Karimi , B , Nikolic , D , Tuukkanen , T , Peltonen , J T , Belzig , W & Pekola , J P 2020 , ' Optimized Proximity Thermometer for Ultrasensitive Detection ' , Physical Review Applied , vol. 13 , no. 5 , 054001 . https://doi.org/10.1103/PhysRevApplied.13.054001

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202006013469

Collections

[article-cris] Perustieteiden korkeakoulu / SCI

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