title: Interaction-induced impeding of decoherence and anomalous diffusion.
abstract: We study how the interplay of dissipation and interactions affects the dynamics of a bosonic many-body quantum system. In the presence of both dissipation and strongly repulsive interactions, observables such as the coherence and the density fluctuations display three dynamical regimes: an initial exponential variation followed by a power-law regime, and finally a slow exponential convergence to their asymptotic values. These very long-time scales arise as dissipation forces the population of states disfavored by interactions. The long-time, strong coupling dynamics are understood by performing a mapping onto a classical diffusion process displaying non-Brownian behavior. While both dissipation and strong interactions tend to suppress coherence when acting separately, we find that strong interaction impedes the decoherence process generated by the dissipation.
authors.affiliation: Département de Physique Théorique, Université de Genève, CH-1211 Genève, Switzerland.
authors.forename: Dario
authors.initials: D
authors.lastname: Poletti
authors.forename: Jean-Sébastien
authors.initials: JS
authors.lastname: Bernier
authors.forename: Antoine
authors.initials: A
authors.lastname: Georges
authors.forename: Corinna
authors.initials: C
authors.lastname: Kollath