EMP is funded through the Horizon2020 programme of the European Commission.
Selected Publications

Optimized Proximity Thermometer for Ultrasensitive Detection

Bayan Karimi, Danilo NikoliÄ?, Tuomas Tuukkanen, Joonas T. Peltonen, Wolfgang Belzig, Jukka P. Pekola

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.

Phys. Rev. Applied 13, 054001 (2020)

doi: 10.1103/PhysRevApplied.13.054001