Regensburg 2004 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 3: Gl
äser I (gemeinsam FV DF/DY)

DF 3.1: Hauptvortrag

Dienstag, 9. März 2004, 09:30–10:00, H23

Theory of the glass transition for systems with trivial statics — •Rolf Schilling¹ and Grzegorz Szamel² — ¹Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz — ²Department of Chemistry, Colorado State University, Ft. Collins, CO 80523, USA

The mode coupling theory (MCT) derived and investigated in great detail by Götze and his coworkers has been the most important step towards the microscopic understanding of the structural glass transition. MCT yields a glass transition if the static correlations reach a critical value. However, there exist systems with trivial statics where static correlations even vanish. Nevertheless they exhibit a discontinuous glass transition which can not be described by MCT in its present form. In a first step we have derived a self-consistent equation for the diffusion constant which yields a continuous transition, in contrast to simulational results. We show how this drawback can be eliminated by a modification of the MCT-approximations. As a result MCT-equations are obtained which are complementary to the original ones. The glass transition is not driven by the growth of static correlations but by the increase of collision events between 2, 3 and 4 particles.