TY - STD AU - Beck, M. AU - Klammer, M. AU - Lang, S. AU - Leiderer, P. AU - Kabanov, V. V. AU - Gol’tsman, G. N. AU - Demsar, J. PY - 2011 DA - 2011// TI - Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy KW - NbN thin film KW - energy gap dynamics AB - 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. UR - https://arxiv.org/abs/1102.5616v2 N1 - Duplicated as 641 ID - Beck_etal2011 ER -