期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.085504
关键词
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资金
- MOST of China [2012CB921703, 2012CB921403]
- NSF of China [11174344, 11074289, 91121003, 11222431, 11074287]
- IOP, CAS
The (root 3 x root 3)R30 degrees honeycomb of silicene monolayer on Ag(111) was found to undergo a phase transition to two types of mirror-symmetric boundary-separated rhombic phases at temperatures below 40 K by scanning tunneling microscopy. The first-principles calculations reveal that weak interactions between silicene and Ag(111) drive the spontaneous unusual buckling in the monolayer silicene, forming two energy-degenerate and mirror-symmetric (root 3 x root 3)R30 degrees rhombic phases, in which the linear band dispersion near the Dirac point and a significant gap opening (150 meV) at the Dirac point were induced. The low transition barrier between these two phases enables them to be interchangeable through dynamic flip-flop motion, resulting in the (root 3 x root 3)R30 degrees honeycomb structure observed at high temperature. DOI: 10.1103/PhysRevLett.110.085504
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