Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Correlated Electrons: Low-Dimensional Systems - Models 1

TT 3.7: Vortrag

Montag, 11. März 2013, 11:15–11:30, H9

Real-time dynamics of charge and spin densities in one-dimensional systems — •Michael Sekania and Arno P. Kampf — Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Germany

In the last decade great effort has been devoted to investigations of the real-time dynamics in strongly correlated systems. We present a theoretical investigation of the space-time evolution of the charge and spin perturbations induced by a local quench of the ground state of the one-dimensional Hubbard model. Employing the time-dependent Density-Matrix Renormalization Group methods we find that induced charge and spin perturbations expand ballistically in the Mott-insulating host system. The expansion velocities in the charge and spin sector are also found to be different as expected for the spin-charge separation scenario. For the metallic hosts close to the half filling, however, the character of the charge expansion changes from ballistic to diffusive and finally to subdiffusive regimes.