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arXiv 1906.05091cond-mat.soft
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二维十次对称胶体准晶液固相变的事件链蒙特卡罗模拟

Event-chain Monte Carlo simulations of the liquid to solid transition of two-dimensional decagonal colloidal quasicrystals

M. Martinsons, J. Hielscher, S. C. Kapfer, M. Schmiedeberg

摘要:

在事件链蒙特卡罗模拟中,我们在两个维度上模拟胶体粒子,这些胶体粒子根据各向同性短程对势相互作用,该势支持十次准晶中存在的两个典型长度尺度。我们研究组装的结构,因为我们改变密度和温度。我们特别感兴趣的是从准晶体到液体的转变。我们发现一个一步一阶熔化过渡没有五面体相内的准晶体的KTHNY熔化理论预测。然而,我们发现,缓慢弛豫的相位翻转,即重排的粒子由于额外的自由度在准晶体中,改变的位置关联函数,这样的结构与长程取向相关性,但指数衰减的位置相关性被观察到。

英文摘要:

In event-chain Monte Carlo simulations we model colloidal particles in two dimensions that interact according to an isotropic short-ranged pair potential which supports the two typical length scales present in decagonal quasicrystals. We investigate the assembled structures as we vary the density and temperature. Our special interest is related to the transition from quasicrystal to liquid. We find a one-step first-order melting transition without a pentahedratic phase as predicted within the KTHNY melting theory for quasicrystals. However, we discover that the slow relaxation of phasonic flips, i.e. rearrangements of the particles due to additional degrees of freedom in quasicrystals, changes the positional correlation functions such that structures with long-range orientational correlations but exponentially decaying positional correlations are observed.

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