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arXiv 1012.4934cond-mat.mtrl-sci
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具有小BN畴的改性石墨烯:一种有效的带隙开放方法

Modified graphene with small BN domain: an effective method for band gap opening

X. F. Fan, Jer-lai Kuo, Z. X. Shen

摘要:

由于相分离,BN畴容易在石墨烯的基面中形成。通过第一性原理密度泛函理论计算,从理论上证明了通过掺杂小的BN畴可以有效地打开石墨烯的带隙。研究还发现,除了费米能级的调制外,B或N的随机掺杂可能在狄拉克点处打开一个小的能隙。在狄拉克点附近属于$π$态的表面电荷被发现局部重新分布。电荷的重新分布是由于掺杂效应引起的局域电势的变化。这可能是由于BN畴的掺杂只在[-0.4eV,0.4eV]能区扰动了Dirac点附近的能态。因此,我们认为掺杂BN畴引起的能带开放是由于势的局域对称性的破坏。在石墨烯中掺杂BN畴是打开狄拉克点附近具有准线性耗散的带隙的有效方法。

英文摘要:

BN domains are easy to form in the basal plane of graphene due to phase separation. With first-principles DFT calculations, it is demonstrated theoretically that the band gap of graphene can be opened effectively around K (or K') points by doping the small BN domains. It is also found that the random doping with B or N is possible to open a small gap in the Dirac points, except for the modulation of Fermi level. The surface charge which belongs to the $π$ states near Dirac points is found to be redistributed locally. The charge redistribution is contributed to the change of localized potential due to the doping effects. This may be the reason that the energy states near Dirac points is just disturbed in the energy region [-0.4eV, 0.4eV] for the doping of BN domain. Thus, we suggest that the band opening induced by the doped BN domain is due to the breaking of localized symmetry of the potential. Doping graphene with BN domains is an effective method to open a band gap with quasi-linear dissipation near Dirac point.

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