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arXiv 1202.1885cond-mat.stat-mechcond-mat.dis-nn
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具有驱动场的随机场伊辛模型中的短时畴壁动力学

Short-time domain-wall dynamics in the random-field Ising model with a driving field

N. J. Zhou, B. Zheng, Y. Y. He

摘要:

用Monte Carlo方法研究了具有驱动场的二维随机场伊辛模型中畴壁的弛豫动力学。仔细研究了脱钉转变的短时动力学行为,观察到畴壁的粗化过程。基于短时动力学标度形式,我们精确地确定了跃迁场、静态和动态指数以及局部和全局粗糙度指数。与通常的假设相反,结果表明畴界面不属于Edwards-Wilkinson方程的普适类。特别地,由于悬突的动力学效应,畴界面表现出与实验一致的内禀反常标度和空间多标度行为

英文摘要:

With Monte Carlo methods, we investigate the relaxation dynamics of a domain wall in the two-dimensional random-field Ising model with a driving field. The short-time dynamic behavior at the depinning transition is carefully examined, and the roughening process of the domain wall is observed. Based on the short-time dynamic scaling form, we accurately determine the transition field, static and dynamic exponents, and local and global roughness exponents. In contrast to the usual assumption, the results indicate that the domain interface does not belong to the universality class of the Edwards-Wilkinson equation. In particular, due to the dynamic effect of overhangs, the domain interface exhibits intrinsic anomalous scaling and spatial multiscaling behaviors, compatible with the experiments

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