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arXiv 1102.0134cond-mat.stat-mech
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一种计算长程相互作用体系自由能的有效Monte-Carlo方法

An Efficient Monte-Carlo Method for Calculating Free-Energy in Long-Range Interacting Systems

Kazuya Watanabe, Munetaka Sasaki

摘要:

提出了一种有效的计算长程相互作用体系自由能随序参量变化的Monte-Carlo方法。在这种方法中,一个变种的Wang-Landau方法的序参量相结合的随机截止方法,这是最近开发的远程相互作用系统。这种方法使我们能够计算自由能在远程相互作用系统与合理的计算时间,尽管事实上,没有近似。这种方法适用于一个三维磁偶极系统测量自由能作为磁化的函数。通过使用本方法,我们可以计算自由能的大系统尺寸的$16^3$自旋,尽管存在的长程磁偶极相互作用。与传统的由能量态密度和序参量联合计算自由能的Wang-Landau方法相比,讨论了本方法的优缺点.

英文摘要:

We present an efficient Monte-Carlo method for long-range interacting systems to calculate free energy as a function of an order parameter. In this method, a variant of the Wang-Landau method regarding the order parameter is combined with the stochastic cutoff method, which has recently been developed for long-range interacting systems. This method enables us to calculate free energy in long-range interacting systems with reasonable computational time despite the fact that no approximation is involved. This method is applied to a three-dimensional magnetic dipolar system to measure free energy as a function of magnetization. By using the present method, we can calculate free energy for a large system size of $16^3$ spins despite the presence of long-range magnetic dipolar interactions. We also discuss the merits and demerits of the present method in comparison with the conventional Wang-Landau method in which free energy is calculated from the joint density of states of energy and order parameter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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