Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Crystallization and Self Assembly

CPP 13.2: Poster

Monday, March 22, 2010, 16:30–18:00, Poster C

Phase behavior of nanorods on quasicrystalline substrates — •Philipp Kählitz and Holger Stark — TU Berlin, Sekr. EW 7-1, Institut für Theoretische Physik Hardenbergstr. 36, D-10623 BERLIN-Charlottenburg

Quasicrystals are structures with long-range positional and orientational order. However, they cannot be periodic since they possess rotational symmetries such as 5- or 10-fold axis that are forbidden for conventional crystals. These structures lead to new and unique features of matter. Therefore, a lot of effort has recently been initiated to grow atomic quasicrystals on quasicrystalline surfaces. To mimic this situation, 2D light-interference patterns have been used to study the phase behavior of micron-sized colloidal particles in a 2D quasicrystalline potential and new ordered phases have been identified [1,2]. This contribution studies the ordering of nanorods, such as organic molecules, in a quasicrystalline substrate potential. By using Monte-Carlo simulations, we have identified varies novel phases. For example, in one phase the centers of mass of the rods order on a hexagonal lattice whereas their orientations display 10-fold symmetry. We demonstrate how these phases are situated in appropriate phase diagrams as a function of the length of the rods , the potential strenght, and the particle density.

[1] Mikhael et al., Nature (London) 454, 501 (2008)

[2] M. Schmiedeberg and H. Stark , PRL 101, 218302 (2008)