Dresden 2011 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 10: Posters I

DY 10.10: Poster

Monday, March 14, 2011, 17:00–19:00, P4

Glassy dynamics of orientation fluctuations in a stripe-forming system — •Christian Riesch., Günter Radons, and Robert Magerle — Institut für Physik, Technische Universität Chemnitz, D-09107 Chemnitz

We present numerical results indicating aging behavior in the orientation fluctuations of a stripe-forming system in the ordered state. We use a simple model which describes phase separation for a conserved order parameter with additional long-range interactions under the influence of thermal noise. It belongs to a class of models describing microdomain formation in block copolymers and other modulated phases, such as thin magnetic films with dipolar interactions. In our simulations, we focus on the dynamics which result from initial conditions of a defect-free ordered state, i.e. a set of parallel stripes. With increasing noise strength η, an order-disorder transition (ODT) occurs at a critical level η_c. Below the ODT, orientation correlation functions (OCF) computed from local stripe orientation depend on both, simulation time t and waiting time t_w. The OCF are found to scale as C(t,tw)∼ t^−ν· f(t/t_w), where the scaling function f(t/t_w) is well described by a stretched exponential.