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arXiv 2011.08696cond-mat.softcond-mat.stat-mech
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二维硬盘的三步熔化

Three-step melting of hard superdisks in two dimensions

Péter Gurin, Szabolcs Varga, Gerardo Odriozola

摘要:

我们探讨的硬盘和广场通过复制交换蒙特卡罗模拟硬盘超级磁盘的二维系统的熔化方案之间的联系。众所周知的熔化的情况下,观察到的磁盘和方形的限制,而我们观察到一个不寻常的三步方案的双重形状。我们发现,两个中间相介导的熔融:六角相和另一个流体相与$D_2$局部对称性,我们称之为菱形,其中键和粒子取向顺序是准长程。我们的研究结果表明,不仅可以液晶形成分子的熔融过程是复杂的,其中细长的形状稳定几个中间相,但也各向异性准球形分子。

英文摘要:

We explore the link between the melting scenarios of two-dimensional systems of hard disks and squares through replica-exchange Monte Carlo simulations of hard superdisks. The well-known melting scenarios are observed in the disk and square limits, while we observe an unusual three-step scenario for dual-shapes. We find that two mesophases mediate the melting: a hexatic phase and another fluid phase with a $D_2$ local symmetry, we call it rhombatic, where both bond and particle orientational orders are quasi-long-range. Our results show that not only can the melting process of liquid-crystal forming molecules be complicated, where elongated shapes stabilize several mesophases, but also that of anisotropic quasispherical molecules.

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