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

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

2011-02-28

arxiv.org/abs/1102.5616v2

Physics

Condensed Matter

Superconductivity

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

Scientific paper

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.

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