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arXiv 1111.5782cond-mat.softcond-mat.stat-mech
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二维斑片状粒子系统中十二方准晶的形成

Formation of dodecagonal quasicrystals in two-dimensional systems of patchy particles

Marjolein N. van der Linden, Jonathan P. K. Doye, Ard A. Louis

摘要:

用计算机模拟方法研究了具有5块和7块规则排列的二维斑片粒子的行为。对于较高的压力和较宽的斑块宽度,六边形晶体具有最低的焓,而在较低的压力和较窄的斑块,具有五个最近邻居的低密度晶体,以及基于正方形和三角形的(3^2,4,3,4)平铺的晶体的焓变低。有趣的是,在六方晶体变得稳定的参数空间附近的区域,从高温冷却时形成具有十二角对称性的准晶结构。这些准晶体可以被认为是正方形和三角形的镶嵌,并且可能是由与所有不同的可能的这种镶嵌相关联的大的构型熵所稳定的。潜在的实验实现这样的结构使用DNA多臂图案进行了讨论。

英文摘要:

The behaviour of two-dimensional patchy particles with 5 and 7 regularly-arranged patches is investigated by computer simulation. For higher pressures and wider patch widths, hexagonal crystals have the lowest enthalpy, whereas at lower pressures and for narrower patches, lower-density crystals with five nearest neighbours and that are based on the (3^2,4,3,4) tiling of squares and triangles become lower in enthalpy. Interestingly, in regions of parameter space near to that where the hexagonal crystals become stable, quasicrystalline structures with dodecagonal symmetry form on cooling from high temperature. These quasicrystals can be considered as tilings of squares and triangles, and are probably stabilized by the large configurational entropy associated with all the different possible such tilings. The potential for experimentally realizing such structures using DNA multi-arm motifs are discussed.

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