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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. . (Unpublished)

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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 direct determination of the depairing current. Accurate and direct 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:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Frasca, S.0000-0002-3741-2215
Korzh, B.0000-0002-8262-9720
Allmaras, J. P.0000-0001-9621-289X
Wollman, E. E.0000-0002-5474-3745
Additional Information:Part of this research was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Support for this work was provided in part by the DARPA Defense Sciences Office, through the DETECT program. J. P. A. acknowledges partial support from the NASA Space Technology Research Fellowship program. D. Z. acknowledges support from the A*STAR National Science Scholarship.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
NASA Space Technology Research FellowshipUNSPECIFIED
Agency for Science, Technology and Research (A*STAR)UNSPECIFIED
Record Number:CaltechAUTHORS:20190528-085503786
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95807
Deposited By: Tony Diaz
Deposited On:28 May 2019 16:12
Last Modified:09 Mar 2020 13:18

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