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DY: Fachverband Dynamik und Statistische Physik

DY 28: Phase transitions and Critical Phenomena II

DY 28.3: Vortrag

Donnerstag, 25. März 2010, 14:45–15:00, H47

Non-equilibrium phase transition in an exactly solvable driven Ising model with friction — •Alfred Hucht, Sebastian Angst, and Dietrich E. Wolf — Fakultät für Physik, Universität Duisburg-Essen, D-47048 Duisburg

A driven Ising model with friction due to magnetic correlations has recently been proposed by Kadau et al. [1]. The non-equilibrium phase transition present in this system is investigated in detail using analytical methods as well as Monte Carlo simulations [2]. In the limit of high driving velocities v the model shows mean field behavior due to dimensional reduction and can be solved exactly for various geometries. The simulations are performed with three different single spin flip rates: the common Metropolis and Glauber rates as well as a multiplicative rate. Due to the non-equilibrium nature of the model all rates lead to different critical temperatures at v>0, while the exact solution matches the multiplicative rate. Finally, the cross-over from Ising to mean field behavior as function of velocity and system size is analysed in one and two dimensions.

[1] D. Kadau et al., Phys. Rev. Lett. 101, 137205 (2008)

[2] A. Hucht, Phys. Rev. E 80 (in press), arXiv:0909.0533