Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Determining the depairing current in superconducting nanowire single-photon detectors
AU - Frasca, S.
AU - Korzh, B.
AU - Colangelo, M.
AU - Zhu, D.
AU - Lita, A.E.
AU - Allmaras, J.P.
AU - Wollman, E.E.
AU - Verma, V.B.
AU - Dane, A.E.
AU - Ramirez, E.
AU - Beyer, A.D.
AU - Nam, S.W.
AU - Kozorezov, A.G.
AU - Shaw, M.D.
AU - Berggren, K.K.
PY - 2019/8/30
Y1 - 2019/8/30
N2 - 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.
AB - 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.
KW - Avalanche photodiodes
KW - Coplanar waveguides
KW - Inductance
KW - Kinetics
KW - Nanowires
KW - Natural frequencies
KW - Photons
KW - Accurate measurement
KW - Detection mechanism
KW - Fast relaxation
KW - Kinetic inductances
KW - Reflection configuration
KW - Resonance frequencies
KW - Superconducting nanowire single photon detectors
KW - Particle beams
U2 - 10.1103/PhysRevB.100.054520
DO - 10.1103/PhysRevB.100.054520
M3 - Journal article
VL - 100
JO - Physical review B
JF - Physical review B
SN - 2469-9950
IS - 5
M1 - 054520
ER -