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arXiv · 1210.3914

Depinning phase transition in two-dimensional clock model with quenched randomness

X. P. Qin·B. Zheng·N. J. Zhou
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Abstract

With Monte Carlo simulations, we systematically investigate the depinning phase transition in the two-dimensional driven random-field clock model. Based on the short-time dynamic approach, we determine the transition field and critical exponents. The results show that the critical exponents vary with the form of the random-field distribution and the strength of the random fields, and the roughening dynamics of the domain interface belongs to the new subclass with $ζ\neq ζ_{loc} \neq ζ_s$ and $ζ_{loc} \neq 1$. More importantly, we find that the transition field and critical exponents change with the initial orientations of the magnetization of the two ordered domains.

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X. P. Qin, B. Zheng, N. J. Zhou. 2012-10-15. Depinning phase transition in two-dimensional clock model with quenched randomness. https://doi.org/10.1103/physreve.86.031129

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