%0 Generic %T Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy %A Beck, M. %A Klammer, M. %A Lang, S. %A Leiderer, P. %A Kabanov, V. V. %A Gol’tsman, G. N. %A Demsar, J. %D 2011 %F Beck_etal2011 %O Duplicated as 641 %O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1388), last updated on Thu, 13 May 2021 23:33:50 -0500 %X 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. %K NbN thin film %K energy gap dynamics %9 miscellaneous %U https://arxiv.org/abs/1102.5616v2