MONTE-CARLO SIMULATION OF 2-DIMENSIONAL HARD ELLIPSES

被引：147

作者：

CUESTA, JA ^{[1
]}

FRENKEL, D ^{[1
]}

机构：

[1] FOM, INST ATOOM & MOLEC FYS, 1098 SJ AMSTERDAM, NETHERLANDS

来源：

PHYSICAL REVIEW A | 1990年 / 42卷 / 04期

关键词：

D O I：

10.1103/PhysRevA.42.2126

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report constant-pressure Monte Carlo simulations of a system of hard ellipses with aspect ratios k=2, 4, and 6. The results show three different phases: isotropic, nematic, and solid, except for k=2, where no nematic phase is formed. In all cases the fluid-solid transition appears to be first order. However, the isotropic-nematic transition looks first order for k=4 and continuous, via disclination unbinding, for k=6. Thus a tricritical point for some k between these two values is predicted. The simulation results are also compared with a previous theoretical calculation. Satisfactory agreement is found for the equation of state, but the theoretical prediction for the location of the isotropic-nematic transition disagrees with the simulation results. Finally, we observed that the solid phase near melting exhibits anomalously large fluctuations. © 1990 The American Physical Society.

引用

页码：2126 / 2136

页数：11

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