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arXiv 1503.04846cond-mat.soft
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一种新的十二方准晶

New kind of dodecagonal quasicrystal

Alfredo Metere, Peter Oleynikov, Mikhail Dzugutov, Sven Lidin

摘要:

我们报道了一种新颖的十二方准晶,到目前为止从未被观察到,也没有理论预测。它由轴向堆叠的六边形颗粒层组成,具有由相邻层相对于彼此旋转30度引起的12重旋转对称性。准晶是在一个分子动力学模拟的单组分质点系相互作用,通过球对称势,作为一个结果的一级相变从液相下恒密度冷却。这一发现意味着,类似结构的准晶体可能会产生的介晶的种类,产生近晶-B晶体和球形胶体颗粒与适当的调整电位的系统。

英文摘要:

We report a novel kind of dodecagonal quasicrystal that has so far never been observed, nor theoretically predicted. It is composed of axially stacked hexagonal particle layers, with 12-fold rotational symmetry induced by 30 degrees rotation of adjacent layers with respect to each other. The quasicrystal was produced in a molecular-dynamics simulation of a single-component system of particles interacting via a spherically-symmetric potential, as a result of a first-order phase transition from a liquid phase under constant-density cooling. This finding implies that a similarly structured quasicrystal can possibly be produced by the mesogens of the kind that produce smectic-B crystals and in a system of spherically-shaped colloidal particles with appropriately tuned potential.

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