Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Poster II

DY 30.67: Poster

Donnerstag, 29. März 2007, 16:00–18:00, Poster D

Phase diagram of a colloidal adsorbate on a quasicrystalline substrate — •Michael Schmiedeberg and Holger Stark — Max-Planck-Institute for Dynamics and Self-Organization, D-37073 Göttingen, Germany

Using Monte-Carlo simulations, we study the phase behavior of a 2D charged-stabilized colloidal suspension in a potential with decagonal symmetry that can be realized by five interfering laser beams. As one may expect, we find a triangular to liquid phase transition for small potential values and a ten-fold symmetric quasicrystalline phase for high laser intensities. However, in an intermediate regime a quasicrystalline phase exist that only exhibits a 20-fold bond orientational order. It occurs due to the delicate interplay between the interacting colloids and the substrate potential.