Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 42: Coherent Quantum Dynamics (joint session DY/TT)

DY 42.1: Hauptvortrag

Donnerstag, 23. März 2017, 09:30–10:00, ZEU 160

Equilibration and ensembles in coherent quantum systems — •Fabian Essler — Oxford University

I consider the relaxation after quantum quenches in isolated quantum systems. In the thermodynamic limit local relaxation towards a stationary state occurs. I first discuss the characterization of the stationary state for generic and integrable systems and how this relates to properties of finite energy density eigenstates. In generic systems the stationary state is locally thermal and has a volume-law entanglement entropy, while there is a considerably richer set of possibilities in integrable models. I then turn to the recently proposed "quantum disentangled liquid", in which thermalized and non-thermalized degrees of freedom are postulated to co-exist. I discuss the possible existence of such states in the half-filled Hubbard model with strong repulsive interactions.