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arXiv 0905.1573cond-mat.mes-hallcond-mat.other
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应变石墨烯:紧束缚和密度泛函计算

Strained graphene: tight-binding and density functional calculations

R. M. Ribeiro, Vitor M. Pereira, N. M. R. Peres, P. R. Briddon, A. H. Castro Neto

摘要:

我们使用密度泛函计算确定应变下石墨烯的能带结构。从头算能带结构,然后用于提取最适合的紧束缚跳跃参数中使用的应变石墨烯最近的微观模型。据发现,跳跃参数可能会增加或减少时,增加应变,这取决于所施加的应力的取向。拟合的值进行比较,与一个可用的参数化的依赖的轨道重叠分离的两个碳原子的距离。还发现,应变不会在石墨烯中引起间隙,至少对于高达10%的变形。

英文摘要:

We determine the band structure of graphene under strain using density functional calculations. The ab-initio band strucure is then used to extract the best fit to the tight-binding hopping parameters used in a recent microscopic model of strained graphene. It is found that the hopping parameters may increase or decrease upon increasing strain, depending on the orientation of the applied stress. The fitted values are compared with an available parametrization for the dependence of the orbital overlap on the distance separating the two carbon atoms. It is also found that strain does not induce a gap in graphene, at least for deformations up to 10%.

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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