NEW METHOD FOR STUDYING THE DYNAMICS OF DISORDERED SPIN SYSTEMS WITHOUT FINITE-SIZE EFFECTS
NEW METHOD FOR STUDYING THE DYNAMICS OF DISORDERED SPIN SYSTEMS WITHOUT FINITE-SIZE EFFECTS
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DOI：
10.1103/physrevlett.68.2094
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发表时间：
1992-03-30
影响因子：
8.6
通讯作者：
OPPER, M
中科院分区：
文献类型：
--
作者：
EISSFELLER, H;OPPER, M
本文提出了一种避免有限尺寸效应的确定无序自旋系统动力学性质的新方法。该方法是基于精确的动力学平均场方程的无限大系统。由此产生的单自旋动力学的Monte Carlo模拟解决。我们概述了形式主义的并行动力学的一个完全连接的模型与随机耦合。研究了该模型的剩磁衰减。我们发现了一个幂律衰减：m（t）-m（无穷大）与t（-a）成正比，其中a = 0.474，m（无穷大）= 0.184。
A new method is presented which allows the determination of dynamical properties of disordered spin systems avoiding finite-size effects. The method is based on exact dynamical mean-field equations for the infinite large system. The resulting single-spin dynamics is solved by Monte Carlo simulations. We outline the formalism for the parallel dynamics of a fully connected model with random couplings. The decay of remanent magnetization of the model is studied. We find a power-law decay: m(t) -m(infinity) is-proportional-to t(-a), with a = 0.474 and m(infinity) = 0.184 for the infinite system.