Molecular random tilings as glasses
Molecular random tilings as glasses
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DOI：
10.1073/pnas.0902443106
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发表时间：
2009-09-08
影响因子：
11.1
通讯作者：
Beton, Peter H.
中科院分区：
文献类型：
--
作者：
Garrahan, Juan P.;Stannard, Andrew;Beton, Peter H.
我们最近发现，对-三苯基-3，5，3‘，5’-四羧酸吸附在石墨上会自组装成二维菱形无规瓷砖。这种瓷砖接近理想，显示出远距离的相关性，不时被稀疏的局部瓷砖缺陷所打断。在这篇文章中，我们探索了这种类型的随机瓷砖中的动态停滞与结构玻璃中的动态停滞之间的类比。我们发现，这些系统的结构松弛是通过瓦片缺陷的传播-反应来实现的，从而导致了动态的非均匀。我们研究了动力学的标度性质，并讨论了与玻璃的动力学约束模型之间的联系。
We have recently shown that p-terphenyl-3,5,3',5'-tetracarboxylic acid adsorbed on graphite self-assembles into a two-dimensional rhombus random tiling. This tiling is close to ideal, displaying long-range correlations punctuated by sparse localized tiling defects. In this article we explore the analogy between dynamic arrest in this type of random tilings and that of structural glasses. We show that the structural relaxation of these systems is via the propagation-reaction of tiling defects, giving rise to dynamic heterogeneity. We study the scaling properties of the dynamics and discuss connections with kinetically constrained models of glasses.