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arXiv 0802.0115cond-mat.soft
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周期衬底上胶体分子晶体的基态

Ground states of colloidal molecular crystals on periodic substrates

Samir El Shawish, Jure Dobnikar, Emmanuel Trizac

摘要:

球形胶体在周期性外场作用下的二维悬浮液表现出丰富的分子晶相。我们研究在模拟的基态配置的二聚体和三聚体系统,实现正方形和三角形晶格,当两个或三个宏离子被困在每个外部潜在的最小值。的棋盘格或条纹类型的二分订单报告一起更复杂的四分订单,设想聚集在一个单一的潜在的最低限度作为一个复合刚性物体的胶体的缺点进行了讨论。这项工作也揭示了简化假设的基础上以前的理论治疗,使可能的自旋模型的映射。

英文摘要:

Two dimensional suspensions of spherical colloids subject to periodic external fields exhibit a rich variety of molecular crystalline phases. We study in simulations the ground state configurations of dimeric and trimeric systems, that are realized on square and triangular lattices, when either two or three macroions are trapped in each external potential minimum. Bipartite orders of the checkerboard or stripe types are reported together with more complex quadripartite orderings, and the shortcomings of envisioning the colloids gathered in a single potential minimum as a composite rigid object are discussed. This work also sheds light on simplifying assumptions underlying previous theoretical treatments and that made possible the mapping onto spin models.

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