Entropy-Driven Dimerization

IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL
Mauro Sellitto
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引用次数: 0

Abstract

I introduce a lattice gas model with excluded volume interactions and investigate its phase behavior on the square lattice. Monte Carlo simulations and finite-size scaling show a discontinuous sub-lattice ordering transition towards a high-density solidlike phase characterised by an anti-ferromagnetic dimerized ground state with eightfold degeneracy. Since thermodynamics is controlled by entropy alone this provides a simple athermal realization of a dimerization process. Interestingly, the model can be considered as a special case of a family of hard-core lattice gases with local geometric constraints on both particles and vacancies, which generalizes the one proposed by Biroli and Mézard in the context of glassy systems.

熵驱动的二聚
本文引入了一种排除体积相互作用的晶格气体模型,并研究了其在方形晶格上的相行为。蒙特卡罗模拟和有限尺寸缩放显示了一个不连续的亚晶格有序过渡到高密度的固体相,其特征是具有八倍简并的反铁磁二聚基态。由于热力学仅由熵控制,这提供了二聚化过程的一个简单的非热实现。有趣的是,该模型可以被视为对粒子和空位都有局部几何约束的硬核晶格气体族的一个特例,它推广了Biroli和msamzard在玻璃系统背景下提出的模型。
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来源期刊
Journal of Statistical Physics
Journal of Statistical Physics 物理-物理:数学物理
CiteScore
3.10
自引率
12.50%
发文量
152
审稿时长
3-6 weeks
期刊介绍: The Journal of Statistical Physics publishes original and invited review papers in all areas of statistical physics as well as in related fields concerned with collective phenomena in physical systems.
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