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In this study, we evaluate the suitability of using DC-biased aluminiumresonators as low-frequency kinetic inductance detectors operating in thefrequency range of 50 - 120 GHz. Our analysis routine for supercurrent-biasedresonators is based on the Usadel equations and gives outputs including densityof states, complex conductivities, transmission line properties, andquasiparticle lifetimes. Results from our analysis confirm previousexperimental observations on resonant frequency tuneability and retention ofhigh quality factor. Crucially, our analysis suggests that DC-biased resonatorsdemonstrate significantly suppressed superconducting density of states gap.Consequently these resonators have lower frequency detection threshold and aresuitable materials for low-frequency kinetic inductance detectors.

Suppressed-gap millimetre wave kinetic inductance detectors using DC-bias current