Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.17: Poster
Mittwoch, 28. März 2012, 15:00–19:00, Poster B
Ultrafast non-equilibrium dynamics in SDW metals — •Bhaskar Kamble1, Alireza Akbari2, and Ilya Eremin1 — 1Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44801 Bochum — 2Max Planck Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany
We employ a density-matrix theory to analyze the ultrafast dynamics of metallic two-dimensional spin density wave systems on short time scales far away from thermal equilibrium. In particular, we study a non-adiabatic regime where the full account for the time evolution of anomalous expectation values and the coherences between different quasiparticle states are required. We calculate the time evolution of the SDW mean-field order parameter and compare its behavior with that of a superconductor. In addition, we discuss the transition between the adiabatic and the non-adiabatic regimes, where the order parameter oscillates, and a description in terms of the quasiparticle occupations becomes insufficient.