Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 10: Topical Session Glass Dynamics III

MM 10.1: Topical Talk

Montag, 22. März 2010, 14:45–15:15, H16

Transport Processes in Dense Melts near and far from Equilibrium — •Thomas Voigtmann — Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln — Zukunftskolleg, Universität Konstanz, 78457 Konstanz — Fachbereich Physik, Universität Konstanz, 78457 Konstanz

Mass transport in densely packed liquids is characterized by slow dynamical processes and a strong sensitivity of the transport coefficients to control parameters and/or external fields. I will give an overview of recent theoretical developments based on the mode-coupling theory of the glass transition and some of its nonequilibrium generalizations. I will in particular focus on the relation between tagged-particle properties as measured, e.g., through self-diffusion processes, and the collective dynamics probed for example in the inter-diffusion of concentration fluctuations in multicomponent glass formers and metallic melts. Mixtures that exhibit strong decoupling between the individual species demonstrate the similarities and differences in these processes quite clearly. Externally applied forces allow to probe the underlying dynamical processes in the nonlinear, nonequilibrium regime, and thus provide much more detailled information than just the equilibrium transport coefficients. As an example, I will discuss the relation between local, microscopic friction and its macroscopic counterpart, viscosity.