Electronic structure and imaging contrast of graphene moiré on metals.

Electronic structure and imaging contrast of graphene moiré on metals.
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DOI:
10.1038/srep01072
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Dedkov, Yu. S.
Dedkov, Yu. S.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Voloshina, E. N.;Fertitta, E.;Garhofer, A.;Mittendorfer, F.;Fonin, M.;Thissen, A.;Dedkov, Yu. S.

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在4d和5d过渡金属表面上实现石墨烯莫尔超结构提供了具有周期性调制电子密度的模板,这是许多迷人效应的原因,包括量子点的形成和有机分子或金属簇在石墨烯上的位置选择性吸附。在这里,应用扫描探针显微镜/光谱学和密度泛函理论计算的组合,我们获得了深刻的洞察电子和地形的贡献,外延石墨烯/Ir(111)系统的成像对比度。我们直接表明,在STM成像的电子贡献是占主导地位的地形相比。在力显微镜和光谱实验中,我们观察到石墨烯莫尔超晶胞内尖端和高对称位置之间的相互作用强度的变化,这决定了石墨烯/Ir(111)上分子或金属簇的吸附位点。
Realization of graphene moiré superstructures on the surface of 4d and 5d transition metals offers templates with periodically modulated electron density, which is responsible for a number of fascinating effects, including the formation of quantum dots and the site selective adsorption of organic molecules or metal clusters on graphene. Here, applying the combination of scanning probe microscopy/spectroscopy and the density functional theory calculations, we gain a profound insight into the electronic and topographic contributions to the imaging contrast of the epitaxial graphene/Ir(111) system. We show directly that in STM imaging the electronic contribution is prevailing compared to the topographic one. In the force microscopy and spectroscopy experiments we observe a variation of the interaction strength between the tip and high-symmetry places within the graphene moiré supercell, which determine the adsorption sites for molecules or metal clusters on graphene/Ir(111).
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