期刊
NEW JOURNAL OF PHYSICS
卷 16, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/16/7/075006
关键词
silicene; Ag(111); scanning tunneling microscope
资金
- National Basic Research Program of China [2012CB927401, 2011CB921902, 2013CB921902, 2011CB922200]
- NSFC [11374206, 91021002, 11274228, 10904090, 11174199, 11134008]
- Future and Emerging Technologies (FET) program of the European Commission, under FET [270749]
- Top-notch Young Talents Program
- Shanghai Municipal Education Commission
- Deutsche Forschungsgemeinschaft (DFG) [VO1261/3-1]
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 x 4 - alpha, 4x4 - beta, root 13 x root 13 - alpha, root 13 x root 13 - beta and root 13 x root 13 - gamma, 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.
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