1. Suppressed-gap millimetre wave kinetic inductance detectors using DC-bias current
- Author
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Songyuan Zhao, Stafford Withington, Christopher N. Thomas, David J. Goldie, Zhao, Songyuan [0000-0002-5712-6937], Apollo - University of Cambridge Repository, Goldie, David [0000-0001-8472-5110], and Thomas, Christopher [0000-0002-4039-6551]
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Paper ,Materials science ,Acoustics and Ultrasonics ,Condensed matter ,FOS: Physical sciences ,Applied Physics (physics.app-ph) ,02 engineering and technology ,01 natural sciences ,GeneralLiterature_MISCELLANEOUS ,Resonator ,Quality (physics) ,Transmission line ,0103 physical sciences ,ComputingMilieux_COMPUTERSANDEDUCATION ,010306 general physics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,ComputingMilieux_MISCELLANEOUS ,Superconductivity ,Range (particle radiation) ,ComputingMilieux_THECOMPUTINGPROFESSION ,DC-bias ,superconducting resonators ,Physics - Applied Physics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Computational physics ,kinetic inductance detectors ,Density of states ,Quasiparticle ,ComputingMilieux_COMPUTERSANDSOCIETY ,0210 nano-technology ,Astrophysics - Instrumentation and Methods for Astrophysics ,DC bias - Abstract
Funder: CSC Cambridge Scholarship, In this study, we evaluate the suitability of using DC-biased aluminium resonators as low-frequency kinetic inductance detectors capable of operating in the frequency range of 50–120 GHz. Our analysis routine for supercurrent-biased resonators is based on the Usadel equations and gives outputs including density of states, complex conductivities, transmission line properties, and quasiparticle lifetimes. Results from our analysis confirm previous experimental observations on resonant frequency tuneability and retention of high quality factor. Crucially, our analysis suggests that DC-biased resonators demonstrate significantly suppressed superconducting density of states gap. Consequently these resonators have lower frequency detection threshold and are suitable materials for low-frequency kinetic inductance detectors.
- Published
- 2022
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