Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Correlated Electrons: (General) Theory

TT 23.11: Vortrag

Mittwoch, 27. Februar 2008, 16:45–17:00, H 0104

Relaxation of a one-dimensional Mott insulator after a quantum quench — •Marcus Kollar and Martin Eckstein — Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, 86135 Augsburg, Germany

We obtain the exact time evolution for a one-dimensional integrable fermionic Hubbard model after a sudden change of its interaction parameter, starting from either a metallic or a Mott-insulating state. In all cases the system relaxes to a new steady state, showing that the presence of the Mott gap does not inhibit relaxation. The properties of the final state are described by the fully constrained Gibbs ensemble. We discuss under which conditions such ensembles provide the correct statistical description of integrable systems in general.