Hotspot relaxation dynamics in a current-carrying superconductor

F. Marsili, M. J. Stevens, A. Kozorezov, V. B. Verma, Colin Lambert, J. A. Stern, R. D. Horansky, S. Dyer, S. Duff, D. P. Pappas, A. E. Lita, M. D. Shaw, R. P. Mirin, and S. W. Nam

Phys. Rev. B 93, 094518 – Published 17 March 2016

Abstract

We experimentally studied the dynamics of optically excited hotspots in current-carrying WSi superconducting nanowires as a function of bias current, bath temperature, and excitation wavelength. We observed that the hotspot relaxation time depends on bias current, temperature, and wavelength. We explained this effect with a model based on quasiparticle recombination, which provides insight into the quasiparticle dynamics of superconductors.

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Received 9 June 2015
Revised 7 January 2016

DOI:https://doi.org/10.1103/PhysRevB.93.094518

Authors & Affiliations

F. Marsili^1,*, M. J. Stevens², A. Kozorezov³, V. B. Verma², Colin Lambert³, J. A. Stern¹, R. D. Horansky², S. Dyer², S. Duff², D. P. Pappas², A. E. Lita², M. D. Shaw¹, R. P. Mirin², and S. W. Nam²

¹Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
²National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA
³Department of Physics, Lancaster University, Lancaster, United Kingdom LA1 4YB

^*Corresponding author: francesco.marsili.dr@jpl.nasa.gov

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Vol. 93, Iss. 9 — 1 March 2016

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