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Planar Silicene: A New Silicon Allotrope Epitaxially Grown by Segregation

机译:平面硅:偏析外延生长的新型硅同素异形体

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摘要

2D sheets of graphene-like silicon, namely planar silicene, are synthesized. This new silicon allotrope is prepared on Au(111) thin films grown on a Si(111) substrate in the process of surface segregation. Owing to its almost perfectly flat geometry it shares the atomic structure with graphene rather than with low-buckled silicene. Scanning tunneling microscopy measurements clearly display an atomically resolved planar silicene honeycomb lattice. Ab initio density functional theory calculations fully support the experimental findings and predict a pure sp(2) atomic configuration of Si atoms. The present work is the first experimental evidence of epitaxial planar silicene.
机译:合成了二维石墨烯样硅片,即平面硅片。这种新的硅同素异形体是在表面偏析过程中在Si(111)衬底上生长的Au(111)薄膜上制备的。由于其几乎完美的平坦几何形状,它与石墨烯而不是与低屈曲的硅石共享原子结构。扫描隧道显微镜测量清楚地显示了原子分解的平面硅碳蜂窝状晶格。从头算密度函数理论计算完全支持实验结果,并预测Si原子的纯sp(2)原子构型。目前的工作是外延平面硅的第一个实验证据。

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