Dresden 2009 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Pattern formation in colloidal and granular systems I
DY 24.1: Vortrag
Donnerstag, 26. März 2009, 14:45–15:00, ZEU 255
Reversibly tunable standing strain wave pattern and soliton dynamics in a two dimensional colloidal crystal with confinement — •David Yu-Hang Chui1, Surajit Sengupta2, Ian K Snook3, and Kurt Binder1 — 1Institut für Physik, Johannes-Gutenberg-Universitüt, Staudingerweg 7, 55099 Mainz, Germany — 2S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700098, India — 3Applied Physics, School of Applied Science, RMIT University, GPO Box 2476V, Melbourne 3001, VIC, Australia
We have shown that confinement can be used to impose a controllable mesoscopic superstructure of a predominantly mechanical elastic character on a crystal [1]. The two dimensional colloidal crystal of two different sizes interacting with an inverse power law potential was simulated using Monte Carlo simulations [2]. Two structured walls, which are created by choosing two rows of particles fixed in the positions of the triangular lattice, provide the confinement to the system. Due to an interplay of the particle density of the system and the width D of a confining channel, ``soliton staircases'' can be created along both parallel confining boundaries, that give rise to standing strain waves in the entire crystal. This strain wave superstructure in the crystal can be reversibly tuned by varying the physical conditions. The novel soliton dynamics and elasticity are also investigated using Molecular Dynamics simulations. References [1] Y. H. Chui, S. Sengupta and K. Binder, Europhysics Letter 83, 58004 (2008). [2] A. Ricci, P. Nielaba, S. Sengupta and K. Binder, Physical Review E 75, 011405 (2007).