Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.11: Poster

Monday, March 11, 2013, 18:00–20:00, Poster E

Stability Analysis of Intrinsic Colloidal Quasicrystals: A Recipe for Designing Quasicrystals — •Erdal Celal Oǧuz and Michael Schmiedeberg — Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany

A big advantage of studying colloidal quasicrystals is that individual particle positions are directly observable (eg. by using video-microscopy) and therefore real-space information is accessible. Another advantage is that the interaction between the colloidal particles in principle can be fine-tuned. In this work, we investigate the ground state (T=0) stability of colloidal quasicrystals by minimizing the lattice sum. For this purpose, we develop lattice summation techniques for quasicrystals with 5-, 8-, 10- and 12-fold rotational symmetry. Subsequently, we minimize the potential energy with respect to particle coordinates for various pair interaction potentials with two length scales. Our goal is to find suitable isotropic interaction potentials that lead to stable quasicrystalline order.