Berlin 2008 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster II
DY 29.64: Poster
Thursday, February 28, 2008, 16:00–18:00, Poster C
Non-periodic locked phase of a 2D colloidal system in a 1D quasicrystalline potential — •Michael Schmiedeberg and Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany
We study a two-dimensional charge-stabilized colloidal system under the influence of a one-dimensional quasicrystalline optical lattice. The resulting quasicrystalline potential consists of two modulations with wave vectors whose magnitudes differ by a factor of τ2, where τ is the number of the golden mean. For high values of the potential strength, periodically ordered structures do not exist [1].
By using Brownian dynamics symulations, we studied the dynamics of the non-periodic phases in the regime of high potential values and determined a phase transition between the well-known modulated liquid phase for small values of the Debye screening length and a non-periodic locked phase for large screening lengths. Details of our study will be presented.
[1] M. Schmiedeberg, J. Roth, and H. Stark, Phys. Rev. Lett. 97, 158304 (2006)