Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Glasses II (joint session with DY)
CPP 12.4: Talk
Tuesday, March 27, 2012, 10:45–11:00, MA 004
Statistical analysis of the non-linear dynamics of a supercooled model fluid under a microrheological perturbation — •Carsten Schroer1,2 and Andreas Heuer1,2 — 1Institut für physikalische Chemie, Münster, Germany — 2Graduate School of Chemistry, Münster, Germany
In our approach we regard the complex dynamics of glass-forming systems as a stochastic process on the potential energy landscape (PEL). Via computer simulations it is possible to map the continuous dynamics onto a hopping motion between the corresponding inherent structures of the system. We find mesoscopic regions (metabasins) in the PEL where the system is located for long times so that dynamics is mainly determined by the transitions between those metabasins. These discrete processes allow us to describe the dynamics in terms of a continuous time random walk.
This approach is of particular interest when including a microrheological perturbation via non-equilibrium molecular dynamic simulations. We report how linear and non-linear responses translate into the continuous time random walk properties of the system. Furthermore we show what consequences for the pathway of the system in its PEL arise by the application of a microrheological perturbation. We discuss these effects in terms of a rejuvenation scenario.