Comparing light-induced colloidal quasicrystals with different rotational symmetries
Comparing light-induced colloidal quasicrystals with different rotational symmetries
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DOI：
10.1088/0953-8984/24/28/284101
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发表时间：
2012-07-18
影响因子：
2.7
通讯作者：
Stark, Holger
中科院分区：
文献类型：
--
作者：
Schmiedeberg, Michael;Stark, Holger
准晶是具有长程取向有序的非周期结构。与晶体不同，准晶在原理上可以具有任何非晶体学的旋转对称性。然而，只有少数这些旋转对称性已被观察到。通过对具有准晶对称性的激光干涉图样中的胶体粒子进行Monte Carlo模拟，我们比较了二维中不同旋转对称性的准晶有序的起始。我们发现，准晶与5-，8-，10-和12倍旋转轴可以诱导与其他非晶体学旋转对称性的准晶相比，较低的激光强度。我们将这一发现与各自干涉图样中的局部对称中心的数量有关。
Quasicrystals are aperiodic structures with long-range orientational order. Unlike crystals, quasicrystals can, in principle, possess any non-crystallographic rotational symmetry. However, only a few of these rotational symmetries have been observed. By using Monte Carlo simulations of colloidal particles in laser interference patterns with quasicrystalline symmetry, we compare the onset of quasicrystalline order for different rotational symmetries in two dimensions. We find that quasicrystals with 5-, 8-, 10-, and 12-fold rotational axes can be induced with lower laser intensities than quasicrystals with other non-crystallographic rotational symmetries. We relate this finding to the number of local symmetry centers in the respective interference patterns.