Weak-Link Physics in the Dynamical Response of Transition-Edge Sensors
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.
- Publication:
-
Physical Review Applied
- Pub Date:
- August 2023
- DOI:
- 10.1103/PhysRevApplied.20.024017
- arXiv:
- arXiv:2212.06443
- Bibcode:
- 2023PhRvP..20b4017K
- Keywords:
-
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Superconductivity
- E-Print:
- Physical Review Applied 20, 024017 (2023)