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arXiv 0909.5052cond-mat.mes-hallcond-mat.mtrl-sci
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带隙石墨烯的单轴应变

Uniaxial strain on gapped graphene

M. Farjam, H. Rafii-Tabar

摘要:

研究了单轴应变对带隙石墨烯电子能带结构的影响。我们考虑两种类型的带隙石墨烯,一种打破了两个三角形子晶格之间的对称性(交错模型),另一种是交替的蜂窝晶格上的键(凯库莱模型)。在交错模型中,低于临界值的应变的影响仅是带隙位置的移动。在Kekulé模型中,随着应变的增加,带隙位置最初被钉扎到布里渊区的一个角落,而其宽度减小,并且在带隙闭合之后,接触点的位置开始移动。分析和数值计算结果得到的紧束缚和狄拉克费米子描述的带隙石墨烯。

英文摘要:

We study the effect of uniaxial strain on the electronic band structure of gapped graphene. We consider two types of gapped graphene, one which breaks the symmetry between the two triangular sublattices (staggered model), and another which alternates the bonds on the honeycomb lattice (Kekulé model). In the staggered model, the effect of strains below a critical value is only a shift of the band gap location. In the Kekulé model, as strain is increased, band gap location is initially pinned to a corner of the Brillouin zone while its width diminishes, and after gap closure the location of the contact point begins to shift. Analytic and numerical results are obtained for both the tight-binding and Dirac fermion descriptions of gapped graphene.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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