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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Low-Dimensional Systems - Models 3

TT 25.10: Talk

Tuesday, March 12, 2013, 12:15–12:30, H9

The Role of Local and Non-Local Conserved Quantities in the Thermalization of Closed Quantum Systems — •Nikolaos P. Konstantinidis and Jesko Sirker — Fachbereich Physik und Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

We investigate thermalization after a sudden quench for antiferromagnetic Heisenberg models on finite rings, with extrapolation of the results to the thermodynamic limit. We show that in the non-integrable case, which results from the inclusion of next-nearest neighbor interactions, only local conservation laws are important for the thermalization of local quantities, while the contribution of non-local operators vanishes exponentially with system size. The equilibrated system in the thermodynamic limit is thus described by a canonical ensemble. We also examine how in the integrable case the additional local but longer-range conserved quantities affect thermalization.