Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 29: Colloids and Complex Liquids I
CPP 29.1: Vortrag
Mittwoch, 2. April 2014, 09:30–09:45, ZEU 114
Periodic Average Structures of Colloidal Monolayers on 1D Quasicrystalline Substrates — •Lamiss Zaidouny1, Thomas Bohlein1, Johannes Roth2, and Clemens Bechinger1,3 — 12. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — 2Institut für Theoretische und Angewandte (ITAP), Pfaffenwaldring 57, 70550 Stuttgart, Germany — 3Max-Planck-Institut für Intelligente systems, Stuttgart, Germany
We experimentally demonstrate that a colloidal monolayer with repulsive pair interaction which is subjected to a 1D quasiperiodic substrate light potential can lead to the formation of a periodic density modulation perpendicular to the orientation of the substrate. Interestingly, the periodicity does not coincide with one of the quasiperiodic length scales and is also independent of the particle number density over a wide range. Our findings are in quantitative agreement with the concept of periodic average structures (PAS) of quasicrystals (QC) which have been introduced by Janner, Janssen and de Wolf (1). The study of this concept in our experiments can lead to understand the QC-C transformations observed in atomic systems, as for example in metallic alloys (2,3). (1) P. M. de Wolf, T. Janssen and A. Janner. Acta Crystallogr, A37, 625, 1981 (2) E. Abe, A.P. Tsai, PRL 83,4 (1999) (3) B. Grushko, D. Holland-Moritz, R. Wittman, G. Wild, Alloys Comp. 280, 215-230 (1998)