Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy

M. Beck; M. Klammer; S. Lang; P. Leiderer; V. V. Kabanov; G. N. Gol'tsman; J. Demsar

doi:10.1103/PhysRevLett.107.177007

Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy

Superconductivity 2015-05-27 v2 Strongly Correlated Electrons

Authors: M. Beck , M. Klammer , S. Lang , P. Leiderer , V. V. Kabanov , G. N. Gol'tsman , J. Demsar

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Abstract

Using time-domain Terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparticle recombination rate, the Cooper pair-breaking rate and the electron-phonon coupling constant, \lambda = 1.1 +/- 0.1, which is in excellent agreement with theoretical estimates.

Keywords

superconducting gap dynamics NbN thin films time-resolved terahertz spectroscopy quasiparticle recombination Rothwarf-Taylor model electron-phonon coupling

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@article{arxiv.1102.5616,
  title  = {Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy},
  author = {M. Beck and M. Klammer and S. Lang and P. Leiderer and V. V. Kabanov and G. N. Gol'tsman and J. Demsar},
  journal= {arXiv preprint arXiv:1102.5616},
  year   = {2015}
}

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4 pages, 4 figures; final version, accepted for publication in Phys. Rev. Lett

Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy

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