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arXiv 1801.08962cond-mat.stat-mech
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正方形稀位Ising关联格上的自回避行走

Self-Avoiding Walk on the square site-diluted Ising-correlated lattice

J. Cheraghalizadeh, M. N. Najafi, H. Mohammadzadeh, A. Saber

摘要:

研究了正方形格点稀释关联渗流格上的自回避行走问题。利用伊辛模型实现度量空间的空间相关性。作为一个公认的结果,(广义)弗洛里的平均场关系进行了测试,以衡量相关性的影响。在研究了微扰的Fokker-Planck方程后,我们采用了一种丰富的Rosenbluth Monte Carlo方法来研究这个问题。为了更精确地,还进行了缠绕角分析,从中提取Schramm-Loewner演化(SLE)理论($κ$)的扩散率参数。我们发现,在临界Ising(主机)系统的指数与Flory的近似。对于非临界Ising系统,我们还发现了Walker迹的分形维数与Ising系统$ξ(T)$的关联长度的关系,即$D_F^{\text{SAW}}(T)-D_F^{\text{SAW}}(T_c)\sim \frac{1}{\sqrt{ξ(T)}}$ .

英文摘要:

The self-avoiding walk on the square site-diluted correlated percolation lattice is considered. The Ising model is employed to realize the spatial correlations of the metric space. As a well-accepted result, the (generalized) Flory's mean field relation is tested to measure the effect of correlation. After exploring a perturbative Fokker-Planck-like equation, we apply an enriched Rosenbluth Monte Carlo method to study the problem. To be more precise, the winding angel analysis is also performed from which the diffusivity parameter of Schramm-Loewner evolution (SLE) theory ($κ$) is extracted. We find that at the critical Ising (host) system the exponents are in agreement with the Flory's approximation. For the off-critical Ising system we find also a new behavior for the fractal dimension of the walker trace in terms of the correlation length of the Ising system $ξ(T)$, i.e. $D_F^{\text{SAW}}(T)-D_F^{\text{SAW}}(T_c)\sim \frac{1}{\sqrt{ξ(T)}}$.

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