We couple a proximity Josephson junction to a Joule-heated normal metal film and measure its electron temperature under steady state and nonequilibrium conditions. With a timed sequence of heating and temperature probing pulses, we are able to monitor its electron temperature in nonequilibrium with effectively zero back-action from the temperature measurement in the form of additional dissipation or thermal conductance. The experiments demonstrate the possibility of using a fast proximity Josephson junction thermometer for studying thermal transport in mesoscopic systems and for calorimetry.
@article{arxiv.1710.10082,
title = {Fast thermometry with a proximity Josephson junction},
author = {Libin Wang and Olli-Pentti Saira and Jukka Pekola},
journal= {arXiv preprint arXiv:1710.10082},
year = {2019}
}