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Published May 1, 2020 | Version v1
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Optimized Proximity Thermometer for Ultrasensitive Detection

  • 1. QTF Centre of Excellence, Department of Applied Physics, Aalto University School of Science, P.O. Box 13500, 00076 Aalto, Finland
  • 2. Fachbereich Physik, Universität Konstanz, D-78467, Germany

Description

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.

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Additional details

Related works

Is published in
Journal article: 10.1103/PhysRevApplied.13.054001 (DOI)

Funding

QuESTech – QUantum Electronics Science and TECHnology training 766025
European Commission