Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 28: FS: Time-Resolved Spectroscopy in Correlated Electron Systems:
Experiment and Theory
TT 28.8: Talk
Thursday, March 25, 2010, 12:45–13:00, H18
Ultrafast non-equilibrium dynamics in conventional and unconventional superconductors — •Andreas Schnyder and Dirk Manske — Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
We present simulations of the ultrafast dynamics of conventional and unconventional superconductors using density-matrix theory. In particular, we study how the optical conductivity evolves in response to ultrashort optical pulses in the frequency range of the superconducting gap, i.e., in the terahertz regime. The dominant relaxation process is assumed to be due to electron-phonon collisions. Employing a second order cluster expansion and assuming that the phonons remain equilibrated, Boltzmann type equations for the dynamics of the quasiparticle occupations and coherences are derived. We apply our theoretical model to the study of non-equlibrium dynamics in the two-gap superconductor MgB2.