Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 29: Glass II (joint session with DF)

DY 29.4: Vortrag

Dienstag, 28. März 2006, 15:30–15:50, M{\"U}L Elch

Dynamics of mobile particles in an immobile environment: Computer simulations of disparate-sized mixtures — •Jürgen Horbach and Norio Kikuchi — Insitut für Physik, Johannes-Gutenberg-Universität Mainz, Staudinger Weg 7, 55099 Mainz

Molecular dynamics computer simulations are used to study transport properties of mobile particles in an immobile environment. To this end, we consider simple binary mixtures. The first system consists of small and big soft spheres in two dimensions where the big spheres are a factor of 5 bigger than the small ones. We discuss whether the transport properties are similar to those obtained from mode coupling theory [1]. The second system contains also small and big particles with a size–ratio 1:5. But now a three–dimensional system is considered where the particles interact via a screened Coulomb (or Yukawa) potential (note, that this system can be realized experimentally [2]). Here, a transition is observed where the big particles crystallize while the small particles remain in a kind of fluid phase. We study the activated transport of the small particles in the crystalline matrix.

[1] J. Bosse and Y. Kaneko, Prog. Theoret. Phys. Suppl. 126, 13 (1997); Phys. Rev. Lett. 74, 4023 (1995).

[2] A. Imhof and J.K.G. Dhont, Coll. Surf. A 122, 53 (1997); Phys. Rev. E 52, 6344 (1995); Phys. Rev. Lett. 75, 1662 (1995).