Various atomic structures of monolayer silicene fabricated on Ag(111)

Various atomic structures of monolayer silicene fabricated on Ag(111)
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Ag(111) 上单层硅烯的各种原子结构

DOI:
10.1088/1367-2630/16/7/075006
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发表时间:
2014-07-08
影响因子:
3.3
通讯作者:
Jia, Jin-Feng
Jia, Jin-Feng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, Zhi-Long;Wang, Mei-Xiao;Jia, Jin-Feng

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硅烯是一种以蜂窝状晶格排列的单层硅原子,可以在Ag(111)表面合成,在那里它形成了几种具有不同屈曲模式和周期性的超结构。利用扫描隧道显微镜(STM),我们获得了生长在Ag(111)上的硅烯的高分辨率图像,并揭示了它的五个相,即,4 × 4 − α,4 × 4 − β,13 × 13?>− α,13 × 13?>− β和13 × 13?> - γ,有些是第一次观察到的。对于每个相,我们通过将原子分辨率的STM图像与之前报道的理论模拟结果进行比较来确定其原子结构。因此,我们消除了以前的研究中的矛盾的各种硅烯相的结构模型支持的Ag(111)表面。
Silicene, a monolayer of silicon atoms arranged in honeycomb lattices, can be synthesized on the Ag(111) surface, where it forms several superstructures with different buckling patterns and periodicity. Using scanning tunneling microscopy (STM), we obtained high-resolution images of silicene grown on Ag(111) and revealed its five phases, i.e., 4 × 4 − α, 4 × 4 − β, 13 × 13 ?> − α, 13 × 13 ?> − β and 13 × 13 ?> − γ, some observed for the first time. For each of the phases, we have determined its atomic structure by comparing the atomic-resolution STM images with theoretical simulation results previously reported. We thus eliminate the contradictions of previous studies on the structural models of various silicene phases supported by the Ag(111) surface.