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TT: Fachverband Tiefe Temperaturen

TT 96: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems II

TT 96.7: Vortrag

Donnerstag, 3. April 2014, 16:30–16:45, HSZ 304

Many-body localization and entanglement in disordered quantum spin models — •Rajeev Singh, Jens Bardarson, and Frank Pollmann — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

The presence of disorder in a non-interacting system can localize all the energy eigenstates, a phenomena dubbed Anderson localization. Many-body localization is a generalization of this phenomena to include interactions. The dynamics of disordered interacting quantum systems shows a logarithmic growth (associated with glassy systems) in the entanglement entropy after a global quench [1]. For finite systems, this growth saturates and the saturation value obeys a volume law. A volume law leads to a constant entanglement entropy per site which might be related to thermal entropy and imply partial thermalization of the system. In this work, we study further the dynamics of disordered quantum spin systems and parameter dependence of the long time saturation.
J. H. Bardarson, F. Pollmann and J. E. Moore, Phys. Rev. Lett. 109, 107202 (2012)