期刊
SCIENTIFIC REPORTS
卷 3, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep02399
关键词
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资金
- 2D-NANOLATTICES project of the Future and Emerging Technologies (FET) program within European Commission under FET Grant [270749]
- Deutsche Forschungsgemeinschaft (DFG) [VO1261/3-1]
Silicene, the considered equivalent of graphene for silicon, has been recently synthesized on Ag(111) surfaces. Following the tremendous success of graphene, silicene might further widen the horizon of two-dimensional materials with new allotropes artificially created. Due to stronger spin-orbit coupling, lower group symmetry and different chemistry compared to graphene, silicene presents many new interesting features. Here, we focus on very important aspects of silicene layers on Ag(111): First, we present scanning tunneling microscopy (STM) and non-contact Atomic Force Microscopy (nc-AFM) observations of the major structures of single layer and bi-layer silicene in epitaxy with Ag(111). For the (3 x 3) reconstructed first silicene layer nc-AFM represents the same lateral arrangement of silicene atoms as STM and therefore provides a timely experimental confirmation of the current picture of the atomic silicene structure. Furthermore, both nc-AFM and STM give a unifying interpretation of the second layer (root 3 x root 3)R +/- 30 degrees structure. Finally, we give support to the conjectured possible existence of less stable, similar to 2% stressed, (root 7 x root 7)R +/- 19.1 degrees rotated silicene domains in the first layer.
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