Determining the depairing current in superconducting nanowire single-photon detectors

Frasca, S. and Korzh, B. and Colangelo, M. and Zhu, D. and Lita, A.E. and Allmaras, J.P. and Wollman, E.E. and Verma, V.B. and Dane, A.E. and Ramirez, E. and Beyer, A.D. and Nam, S.W. and Kozorezov, A.G. and Shaw, M.D. and Berggren, K.K. (2019) Determining the depairing current in superconducting nanowire single-photon detectors. Physical review B, 100 (5). ISSN 2469-9950

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Abstract

We estimate the depairing current of superconducting nanowire single-photon detectors (SNSPDs) by studying the dependence of the nanowires' kinetic inductance on their bias current. The kinetic inductance is determined by measuring the resonance frequency of resonator-style nanowire coplanar waveguides both in transmission and reflection configurations. Bias current dependent shifts in the measured resonant frequency correspond to the change in the kinetic inductance, which can be compared with theoretical predictions. We demonstrate that the fast relaxation model described in the literature accurately matches our experimental data and provides a valuable tool for determination of the depairing current. Accurate measurement of the depairing current is critical for nanowire quality analysis, as well as modeling efforts aimed at understanding the detection mechanism in SNSPDs.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
Subjects:
ID Code:
137358
Deposited By:
Deposited On:
28 Apr 2020 09:25
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2020 09:46