Voltage Fluctuations in ac Biased Superconducting Transition-Edge Sensors
arXiv:2210.06869 · doi:10.1103/PhysRevLett.126.217001
Abstract
We present a detailed analysis of the fundamental noise sources in superconducting transition-edge sensors (TESs), ac voltage biased at MHz frequencies and treated as superconducting weak links. We have studied the noise in the resistive transition as a function of bath temperature of several detectors with different normal resistances and geometries. We show that the excess noise, typically observed in the TES electrical bandwidth, can be explained by the equilibrium Johnson noise of the quasiparticles generated within the weak link. The fluctuations at the Josephson frequency and higher harmonics contribute significantly to the measured voltage noise at the detector bandwidth through the nonlinear response of the weak link with a sinusoidal current-phase relation.
9 pages, 7 figures
References in corpus (5)
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- Mitigation of the Magnetic Field Susceptibility of Transition Edge Sensors using a Superconducting Groundplane
- Impact of the absorber coupling design for Transition Edge Sensor X-ray Calorimeters
- Slow electron-phonon relaxation controls the dynamics of the superconducting resistive transition
- Demonstration of Weak-Link Physics in the Dynamical Response of Transition-Edge Sensors
- Fluctuation-driven excess noise near superconducting phase transition