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arXiv 0709.2035cond-mat.softcond-mat.stat-mech
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二维Yukawa系统中六角相和各向同性相的共存性

Coexistence of hexatic and isotropic phases in two-dimensional Yukawa systems

Wei-Kai Qi, Shao-Meng Qin, Xiao-Ying Zhao, Yong Chen

摘要:

我们对粒子与汤川势相互作用的二维胶体晶体的熔化过程进行了布朗动力学模拟。计算了Yukawa体系的对关联函数和键取向关联函数。观察到键取向关联函数的代数衰减。通过排除共存区,只有一个不稳定的六角相被发现在汤川系统。但我们的工作表明Yukawa系统的熔化是一个两阶段的熔化,与KTHNY理论不一致,并且发现了各向同性液体和六角相共存区。

英文摘要:

We have performed Brownian dynamics simulations on melting of two-dimensional colloidal crystal in which particles interact with Yukawa potential. The pair correlation function and bond-orientational correlation function was calculated in the Yukawa system. An algebraic decay of the bond orientational correlation function was observed. By ruling out the coexistence region, only a unstable hexatic phase was found in the Yukawa systems. But our work shows that the melting of the Yukawa systems is a two-stage melting not consist with the KTHNY theory and the isotropic liquid and the hexatic phase coexistence region was found. Also we have studied point defects in two-dimensional Yukawa systems.

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