Nonequilibrium interpretation of DC properties of NbN superconducting hot electron bolometers
M Shcherbatenko (Moscow State University, Moscow State Pedagogical University)
I. Tretyakov (Moscow State University, Moscow State Pedagogical University, Russian Academy of Sciences)
Yu Lobanov (Moscow State Pedagogical University, Moscow State University)
S. N. Maslennikov (Moscow State Pedagogical University)
N. Kaurova (Moscow State Pedagogical University)
M. Finkel (TU Delft - QN/Klapwijk Lab)
B. Voronov (Moscow State Pedagogical University)
G Goltsman (Moscow State Pedagogical University, National Research University Higher School of Economics (HSE University))
T.M. Klapwijk (Moscow State Pedagogical University, TU Delft - QN/Klapwijk Lab)
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Abstract
We present a physically consistent interpretation of the dc electrical properties of niobiumnitride (NbN)-based superconducting hot-electron bolometer mixers, using concepts of nonequilibrium superconductivity. Through this, we clarify what physical information can be extracted from the resistive transition and the dc current-voltage characteristics, measured at suitably chosen temperatures, and relevant for device characterization and optimization. We point out that the intrinsic spatial variation of the electronic properties of disordered superconductors, such as NbN, leads to a variation from device to device.