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Graphyne on metallic surfaces: A density functional theory study

机译:金属表面上的石墨烯:密度泛函理论研究

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摘要

We show how a structural modification of graphene, which gives the carbon allotrope graphyne, can induce an energy gap at the K point of the Brillouin zone. Upon adsorption on metallic surfaces, the same mechanism is responsible for a further modification of energy bands which occurs via the charge transfer mechanism. We perform the calculation based on the density functional theory with the novel nonlocal van der Waals-density functional correlation of the adsorption of graphyne on Cu(111), Ni(111), and Co(0001) surfaces and show the dependence of the band change on the charge transfer in the system. The binding of graphyne appears to be stronger than that of graphene on the same surfaces.
机译:我们展示了石墨烯的结构修饰如何产生碳同素异形体石墨烯,可以在布里渊区的K点处引起能隙。当吸附在金属表面上时,相同的机制负责进一步改变通过电荷转移机制发生的能带。我们基于密度泛函理论,通过石墨烯在Cu(111),Ni(111)和Co(0001)表面上的吸附的新型非局部范德华-密度泛函相关性,进行了计算,并显示了谱带的依赖性更改系统中的电荷转移。在相同的表面上,石墨烯的结合似乎比石墨烯的结合更强。

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