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  • PhysRevB.92.064504

    Rights statement: © 2015 American Physical Society

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Quasiparticle recombination in hotspots in superconducting current-carrying nanowires

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  • A. G. Kozorezov
  • Colin Lambert
  • F. Marsili
  • M. J. Stevens
  • V. B. Verma
  • J. A. Stern
  • R. Horansky
  • S. Dyer
  • S. Duff
  • D. P. Pappas
  • A. Lita
  • M. D. Shaw
  • R. P. Mirin
  • Sae Woo Nam
Article number064504
<mark>Journal publication date</mark>1/08/2015
<mark>Journal</mark>Physical review B
Issue number6
Number of pages16
Publication StatusPublished
<mark>Original language</mark>English


We describe a kinetic model of recombination of nonequilibrium quasiparticles generated by single photon absorption in superconducting current-carrying nanowires. The model is developed to interpret two-photon detection experiments in which a single photon does not possess sufficient energy for breaking superconductivity at a fixed low bias current. We show that quasiparticle self-recombination in relaxing hotspots dominates diffusion expansion effects and explains the observed strong bias current, wavelength, and temperature dependencies of hotspot relaxation in tungsten silicide superconducting nanowire single-photon detectors.

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© 2015 American Physical Society