Weak-Link Physics in the Dynamical Response of Transition-Edge Sensors

Journal article (2023)

Authors

M. Kounalakis Kavli institute of nanoscience Delft, QN/Blanter Group - AS
L Gottardi SRON–Netherlands Institute for Space Research
Martin de Wit SRON–Netherlands Institute for Space Research
Y.M. Blanter QN/Blanter Group - AS , Kavli institute of nanoscience Delft
Research Group
QN/Blanter Group (AS) (TU Delft)
Copyright: © 2023 M. Kounalakis, Luciano Gottardi, Martin De Wit, Y.M. Blanter
DOI: https://doi.org/10.1103/PhysRevApplied.20.024017
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Published Date

2023

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Blanter Group

Abstract

We theoretically predict and experimentally observe the onset of weak-link physics in the dynamical response of transition-edge sensors (TESs). We develop a theoretical framework based on a Fokker-Planck description that incorporates both the TESs electrical response, stemming from Josephson phenomena, and the electrothermal effects due to coupling to a thermal bath. Our measurements of a varying dynamic resistance are in excellent agreement with our theory, thereby establishing weak-link phenomena as the main mechanism underlying the operation of TESs. Furthermore, our description enables the calculation of power spectral densities, paving the way for a more thorough investigation of the unexplained "excess noise"in long diffusive junctions and TESs reported in recent experiments.

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