Sublattice ordering in a dilute ensemble of monovalent adatoms on graphene
Sublattice ordering in a dilute ensemble of monovalent adatoms on graphene
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DOI：
10.1209/0295-5075/89/56003
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发表时间：
2010-03-01
期刊：
影响因子：
1.8
通讯作者：
Fal'ko, V. I.
中科院分区：
文献类型：
--
作者：
Cheianov, V. V.;Syljuasen, O.;Fal'ko, V. I.
当吸附剂附着在石墨烯蜂窝晶格中的碳上时，它们可能会优先占据其两个子晶格中的一个，从而打破全局晶格对称性。这导致在电子光谱中打开一个缺口。我们表明，这种亚晶格有序可能自发地发生在吸附在石墨烯上的吸附原子的低密度系综，由于它们之间的电子介导的长程相互作用。因此，可能会形成亚晶格有序畴，具有二维拓扑绝缘体的电子特性。版权所有（C）EPLA，2010
When adsorbents attach themselves to carbons in the honeycomb lattice of graphene, they may preferentially take positions on one of its two sublattices, thus breaking the global lattice symmetry. This leads to opening a gap in the electronic spectrum. We show that such a sublattice ordering may spontaneously occur in a low-density ensemble of adatoms adsorbed on graphene, due to the long-range interaction between them mediated by electrons. As a result sublattice-ordered domains may form, with electronic properties characteristic of a two-dimensional topological insulator. Copyright (C) EPLA, 2010