Format

Send to

Choose Destination
Phys Rev Lett. 2011 Oct 21;107(17):177007. Epub 2011 Oct 21.

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

Author information

1
Department of Physics and Center for Applied Photonics, Univ. of Konstanz, D-78457, Germany.

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, λ=1.1±0.1, which is in excellent agreement with theoretical estimates.

Supplemental Content

Full text links

Icon for American Physical Society
Loading ...
Support Center