Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Dynamics in many-body systems: Equilibriation and localization
(Joint session of DY and TT organized by DY)

TT 4.4: Vortrag

Montag, 7. März 2016, 10:15–10:30, H47

Equilibration in many-body localised systems — Mathis Friesdorf, Albert Werner, •Marcel Goihl, Winton Brown, and Jens Eisert — Freie Universität Berlin

The effect of many-body localisation (MBL) is connected to an intriguing class of systems that fail to thermalise. Due to the randomness present in these models, both particles and energies remain largely confined to local regions. This prevents the relaxation of excitations and thus leads to a local memory of the precise initial conditions even after long evolution times. Based on a phenomenological model of MBL, we examine the time evolution of these systems and explore the role of local constants of motion, which are intrinsically present if energy is localised. We show that despite the fact that particles and energy are localised, information is able to propagate over arbitrary distances. Following this information theoretical viewpoint, we capture equilibration in MBL systems and derive time scales thereof. We connect our findings to signatures measurable in optical lattice architectures, thus allowing for the distinction of Anderson localisation and true MBL based solely on existing measurement techniques.