Dresden 2006 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.62: Poster
Donnerstag, 30. März 2006, 16:00–18:00, P1
Colloidal Crystals in 2D: elasticity, structures and phase transitions — •Kerstin Franzrahe and Peter Nielaba — Department of Physics, University of Konstanz, 78457 Konstanz, Germany
We investigate the structural and elastic properties of two dimensional colloidal systems via Monte-Carlo Simulations. The colloidal systems of interest were modelled by hard disk systems. Simulations in the NPT- and NVT-Ensemble were carried out in order to analyse lattice formation in binary mixtures. The elastic properties of these systems were calculated using a fluctuation method by S. Sengupta et.al [1]. In this context we also examined the influence of quenched impurities on the elastic properties of a mono disperse hard disk system [2][3]. Another point of interest is the influence of external laser fields on these colloidal crystals. Simulations of a S1(AB) lattice under the influence of a commensurable, spatially periodic, external laser field show domain formation processes that are absent in the field free case.
[1] S. Sengupta, P. Nielaba, M. Rao and K. Binder,Phys. Rev. E 61, pp. 1072 (2000)
[2] K. Franzrahe et. al., Comp. Phys. Commun. 169,pp 197-202 (2005)
[3] P. Nielaba, K. Binder, C. Chaudhuri, K. Franzrahe, P. Henseler, M. Lohrer, A. Ricci, S. Sengupta, W. Strepp, J. Phys.: Condens. Matter 16, S4115-S4136 (2004)