Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 21: Superconductivity: Poster Session
TT 21.3: Poster
Monday, March 16, 2015, 15:00–18:00, Poster B
Signatures of the nonequilibrium dynamics of superconductors in the pump-probe response — •Holger Krull1, Götz S. Uhrig2, Andreas P. Schnyder1, and Dirk Manske1 — 1Max- Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2TU Dortmund, Dortmund, Germany
We present theoretical studies of the pump-probe response of nonequilibrium superconductors coupled to optical phonons. Considering ultra-short pump pulses, the superconductor is pushed into the nonadiabatic regime. It is characterized by oscillations of the order parameter as well as by the generation of coherent phonons. Using the density matrix formalism, we compute the pump-probe response and determine signatures of the order parameter and of the phonon dynamics in the pump-probe conductivity. We find that the nonadiabatic dynamics of the superconductor is reflected in the oscillation in the conductivity as function of the delay time between pump and probe pulse.