无序结构绝对自由能的分子模拟计算
Computing absolute free energies of disordered structures by molecular simulation
摘要:
本文提出了一种蒙特卡罗模拟方法,利用该方法可以直接计算无序系统的自由能。它是基于热力学积分。其中心思想是从一个代表感兴趣状态的配置构造一个解析可解的参考系。该方法可以应用于晶格模型(例如,伊辛模型)以及非晶格分子模型。我们主要关注更具挑战性的非格点情况。我们提出了一种蒙特卡罗算法,它可以有效地采样的热力学积分路径。以硬球液体和含缺陷的硬盘固体为例,讨论了该方法的几个性质。
英文摘要:
We present a Monte Carlo simulation technique by which the free energy of disordered systems can be computed directly. It is based on thermodynamic integration. The central idea is to construct an analytically solvable reference system from a configuration which is representative for the state of interest. The method can be applied to lattice models (e.g., the Ising model) as well as off-lattice molecular models. We focus mainly on the more challenging off-lattice case. We propose a Monte Carlo algorithm, by which the thermodynamic integration path can be sampled efficiently. At the examples of the hard sphere liquid and a hard disk solid with a defect we discuss several properties of the approach.
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