Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 20: Phase Transitions and Critical Phenomena I
DY 20.2: Vortrag
Mittwoch, 24. März 2010, 14:45–15:00, H47
MC simulations regarding the melting transition in a 2d hard disc fluid — •Marc Radu1 and Tanja Schilling2 — 1Johannes Gutenberg Universität, Mainz, Deutschland — 2Université du Luxembourg, Luxembourg, Luxembourg
We present a computer simulation study on the two-dimensional hard disc fluid. We prepared configurations inside the liquid, the hexatic and the solid phase in which the particles were coupled to the sites of a triangular lattice via a harmonic potential. The spring constant was decreased so that we could observe transitions from a state with long-ranged positional and orientational order to the state with the particular ordering characteristic. We compared our results with recent experiments carried out using colloidal particles in an optical trap. Finally we calculated the defect free energies of dislocations by using an algorithm to compute free energies of disordered structures.