Regensburg 2007 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 7: Statistical physics far from thermal equilibrium

DY 7.7: Talk

Monday, March 26, 2007, 16:00–16:15, H5

Time-dependent structure factors of a disordering system — •Robert Stück and Timo Aspelmeier — Institut für Theoretische Physik, Universität Göttingen

The non-equilibrium disordering dynamics of an initially phase-separated crystal via atom-vacancy exchanges is studied by investigating the time-dependent static structure factor. Just before complete disorder, it shows some anomalies such as an dip for periodic boundary conditions and a plateau for reflecting boundary conditions. For the plateau we found an analytic mean field solution which matches perfectly the simulation data. The dip can not be derived by a mean field approximation since it is due to correlations induced by the random walk of the vacancies. The nature of these correlations is studied numerically.