Ge ${_2}$ Pt晶体在Ge（110）上的锗烯封端
Germanene termination of Ge${_2}$Pt crystals on Ge(110)
摘要：
我们用扫描隧道显微镜和光谱研究了Pt在Ge（110）上的生长。在Ge（110）上沉积几个Pt单层，然后在1100 K下退火，结果形成三维金属Pt-Ge纳米晶体。这些晶体的最外层呈现蜂窝状结构。蜂窝结构由两个六边形子晶格组成，它们相对于彼此垂直位移0.2 μ m。蜂窝晶格中原子的最近邻距离为2.5 ${\pm}$ 0.1 π，即非常接近锗烯中预测的最近邻距离（2.4 π）。扫描隧道光谱显示，蜂窝层下面的原子层比蜂窝层本身更金属化。这些观察结果与最近提出的金属二（硅化物/）锗化物模型一致：金属层被半导体层隔开的六方晶体，具有蜂窝晶格。根据我们的观察，我们建议，最外层的Ge 2 Pt的层是锗烯层。
英文摘要：
We have investigated the growth of Pt on Ge(110) using scanning tunneling microscopy and spectroscopy. The deposition of several monolayers of Pt on Ge(110) followed by annealing at 1100 K results in the formation of three-dimensional metallic Pt-Ge nanocrystals. The outermost layer of these crystals exhibits a honeycomb structure. The honeycomb structure is composed of two hexagonal sub-lattices that are displaced vertically by 0.2 Å with respect to each other. The nearest-neighbor distance of the atoms in the honeycomb lattice is 2.5${\pm}$0.1 Å, i.e. very close to the predicted nearest-neighbor distance in germanene (2.4 Å). Scanning tunneling spectroscopy reveals that the atomic layer underneath the honeycomb layer is more metallic than the honeycomb layer itself. These observations are in line with a model recently proposed for metal di-(silicides/)germanides: a hexagonal crystal with metal layers separated by semiconductor layers with a honeycomb lattice. Based on our observations we propose that the outermost layer of the Ge2Pt nanocrystal is a germanene layer.
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