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TT: Fachverband Tiefe Temperaturen

TT 83: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems I

TT 83.2: Vortrag

Donnerstag, 3. April 2014, 10:00–10:15, HSZ 03

Quench Dynamics in a Model with Tuneable Integrability Breaking — Fabian H.L. Essler¹, Stefan Kehrein², •Salvatore R. Manmana², and Neil J. Robinson¹ — ¹The Rudolf Peierls Centre for Theoretical Physics, Oxford University, UK — ²Institut für Theoretische Physik, Georg-August-Universität Göttingen, Germany

We consider quantum quenches in an integrable quantum chain with tuneable integrability breaking interactions. In the case where these interactions are weak, we demonstrate that at intermediate times after the quench local observables relax to a prethermalized regime, which can be described by a density matrix that can be viewed as a deformation of a generalized Gibbs ensemble. We present explicit expressions for the approximately conserved charges characterizing this ensemble. We do not find evidence for a crossover from the prethermalized to a thermalized regime on the time scales accessible to us. Increasing the integrability-breaking interactions leads to a behaviour that is compatible with eventual thermalization.