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arXiv 1302.0087cond-mat.mtrl-scicond-mat.stat-mech
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二维分子固体的强一级熔化

Strongly first order melting of a two dimensional molecular solid

Rakesh S. Singh, Mantu Santra, Biman Bagchi

摘要:

已知二维系统中的熔化和凝固转变显示出极不寻常的特性。大多数早期的研究考虑了原子系统;在二维分子固体中的熔化行为在很大程度上仍然没有探索。为了了解分子系统中存在的多个能量和长度尺度对熔化转变性质的作用,在这里,我们报告了二维梅赛德斯-奔驰(MB)系统熔化的计算机模拟研究。我们发现,各向同性和各向异性相互作用的强度之间的相互作用可以产生丰富的相图。计算得到的固液相图由各向同性的液相和两个晶相组成-蜂窝状和倾斜状。与著名的KTHNY理论相矛盾,我们观察到强烈的一步一级熔融转变的蜂窝和斜固体。与原子系统相比,固体和液体中靠近转变的缺陷都更加复杂。

英文摘要:

Melting and freezing transitions in two dimensional systems are known to show highly unusual characteristics. Most of the earlier studies considered atomic systems; the melting behavior in two dimensional molecular solids is still largely unexplored. In order to understand the role of multiple energy and length scales present in molecular systems on nature of melting transition, here we report computer simulation studies of melting of a two dimensional Mercedes-Benz (MB) system. We find that the interplay between the strength of isotropic and anisotropic interactions can give rise to rich phase diagram. The computed solid-liquid phase diagram consists of isotropic liquid and two crystalline phases - honeycomb and oblique. In contradiction to the celebrated KTHNY theory, we observe strongly one step first order melting transitions for both the honeycomb and oblique solids. The defects in both solids and liquids near the transition are more complex compared to the atomic systems.

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