Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Posters II
DY 29.27: Poster
Donnerstag, 29. März 2012, 17:00–19:00, Poster A
Non-linear single-particle-response of glassforming systems to external fields — •David Winter1, Peter Virnau1, Jürgen Horbach2, and Kurt Binder1 — 1Johannes Gutenberg-Universität, Mainz, Germany — 2Heinrich Heine-Universität, Düsseldorf, Germany
In this work, we study the behavior of single particles in a supercooled liquid under the influence of an external force. Our model system is a 50:50 binary mixture whose particles interact via a Yukawa potential. In the equilibrated system, we add a constant force field to one of these particles which as a consequence will be accelerated. After some time, this particle reaches a steady state. In this state we measure characteristic properties of the particle and the surrounding like the steady state velocity, the friction coefficient, mean square displacements and correlation functions in dependence of the external force and system temperature. We observe that for low temperatures and high enough force fields the particle leaves the linear response regime and enters the non-linear regime. Here, the friction coefficient is not constant any more. For even higher forces all curves reach a second plateau and fall on top of each other.