Graphene on Ru(0001): Contact Formation and Chemical Reactivity on the Atomic Scale
Graphene on Ru(0001): Contact Formation and Chemical Reactivity on the Atomic Scale
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DOI：
10.1103/physrevlett.105.236101
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发表时间：
2010-11-29
影响因子：
8.6
通讯作者：
Berndt, R.
中科院分区：
文献类型：
--
作者：
Altenburg, S. J.;Kroeger, J.;Berndt, R.
用低温扫描隧道显微镜观察了Ru(0001)表面石墨烯与Au尖端的接触。单原子接触的形成和电导在莫尔晶胞内是不同的。密度泛函计算表明，由于Ru(0001)中空位上C原子选择性增强的化学反应活性，石墨烯晶格在接触时发生弹性扭曲。伴随的量子输运计算表明，石墨烯-Ru距离决定了电导的变化。
Graphene on Ru(0001) is contacted with Au tips of a cryogenic scanning tunneling microscope. The formation and conductance of single-atom contacts vary within the moire unit cell. Density functional calculations reveal that elastic distortions of the graphene lattice occur at contact due to a selectively enhanced chemical reactivity of C atoms at hollow sites of Ru(0001). Concomitant quantum transport calculations indicate that the graphene-Ru distance determines the conductance variations.