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arXiv 1208.0903cond-mat.mes-hallcond-mat.mtrl-sci
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扭曲双层石墨烯层间耦合的控制

Controlling the Interlayer Coupling of Twisted Bilayer Graphene

Lan Meng, Wei Yan, Zhao-Dong Chu, Yanfeng Zhang, Lei Feng, Rui-Fen Dou, Jia-Cai Nie, Lin He

摘要:

扭曲双层石墨烯的层间耦合会显著影响其电子能带结构。目前在实验中需要克服的挑战是如何精确控制耦合,从而调整双层石墨烯的电子特性。在这里,我们描述了一种简便的方法来调制的局部层间耦合的单分子磁铁吸附到扭曲的双层石墨烯和报告的表征其电子能带结构使用扫描隧道显微镜和光谱。在隧穿谱中观察到了低能范霍夫奇异性和超晶格狄拉克锥,分别由层间耦合和石墨烯-石墨烯叠栅引起。我们的实验表明,两个VHS的能量差,这反映了层间耦合的大小,可以通过调整的局部覆盖密度的吸附。

英文摘要:

The interlayer coupling of twisted bilayer graphene could markedly affect its electronic band structure. A current challenge required to overcome in experiment is how to precisely control the coupling and therefore tune the electronic properties of the bilayer graphene. Here, we describe a facile method to modulate the local interlayer coupling by adsorption of single molecule magnets onto the twisted bilayer graphene and report the characterization of its electronic band structure using scanning tunneling microscopy and spectroscopy. The low-energy Van Hove singularities (VHSs) and superlattice Dirac cones, induced by the interlayer coupling and graphene-on-graphene moiré respectively, are observed in the tunneling spectra. Our experiment demonstrates that the energy difference of the two VHSs, which reflects the magnitude of interlayer coupling, can be tuned by the local coverage density of adsorption.

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