Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 31: Statistical Physics far from Equilibrium

DY 31.5: Vortrag

Freitag, 26. März 2010, 11:30–11:45, H38

Anisotropic Phase Transition in a two-dimensional Ising model with friction — •Sebastian Angst, Alfed Hucht, and Dietrich E. Wolf — Fakultät für Physik, Universität Duisburg-Essen, D-47057 Duisburg

Magnetic friction is a field of raising interests. Magiera et al. [1] modeled a moving tip above a substrate consisting of Heisenberg spins. Magnetic friction in an Ising model has recently been introduced by Kadau et al.[2], and Hucht [3] investigated thermodynamic properties of this system.

Here two layers of Ising spins, displaced by one lattice constant, are moved relative to each other along an axis. Due to the directed motion the correlations behave differently in direction parallel and perpendicular to the motion. Using Monte Carlo methods it is shown, that the system becomes strongly anisotropic and thus the correlation length diverges with different exponents when reaching criticality. For infinite velocity we determine the correlation length exponents and demonstrate, that the system behaves mean field-like.

[1] M.P. Magiera et al., EPL 87, 26002 (2009)

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

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