Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.90: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Generalized Gibbs ensembles in weakly open quantum systems — •Florian Lange, Zala Lenarcic, and Achim Rosch — Universität zu Köln

We consider weakly driven and weakly open quantum systems in the situation when the unperturbed system has a set of conservation laws. If the perturbation is sufficiently weak the non-equilibrium steady state can be in the thermodynamic limit efficiently described by a generalized Gibbs ensemble (GGE) characterized by one Lagrange parameter for each approximate conservation law. The values of those are determined by rate equations for the approximately conserved quantities. We extend the concept of GGEs by showing that an ensemble with time-dependent Lagrange parameters can capture the relaxation towards the steady state.