硅烯
半金属
凝聚态物理
材料科学
石墨烯
纳米电子学
费米能级
费米能量
纳米技术
带隙
物理
量子力学
电子
作者
Rui Qin,Chun‐Hai Wang,Wenjun Zhu,Yalin Zhang
出处
期刊:AIP Advances
[American Institute of Physics]
日期:2012-06-01
卷期号:2 (2)
被引量:150
摘要
We perform first-principles calculations of mechanical and electronic properties of silicene under strains. The in-plane stiffness of silicene is much smaller than that of graphene. The yielding strain of silicene under uniform expansion in the ideal conditions is about 20%. The homogeneous strain can introduce a semimetal-metal transition. The semimetal state of silicene, in which the Dirac cone locates at the Fermi level, can only persist up to tensile strain of 7% with nearly invariant Fermi velocity. For larger strains, silicene changes into a conventional metal. The work function is found to change significantly under biaxial strain. Our calculations show that strain tuning is important for applications of silicene in nanoelectronics.
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