Electric-Field-Induced Energy Gap in Few-Layer Graphene

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• 作者：Kechao Tang ; Rui Qin ; Jing Zhou ; Heruge Qu ; Jiaxin Zheng ; Ruixiang Fei ; Hong Li ; Qiye Zheng ; Zhengxiang Gao ; Jing Lu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：May 19, 2011
• 年：2011
• 卷：115
• 期：19
• 页码：9458-9464
• 全文大小：1050K
• 年卷期：v.115,no.19(May 19, 2011)
• ISSN：1932-7455

文摘

We provide the first systematic ab initio investigation of the possibility to create a band gap in few-layer graphene (FLG) via a perpendicular electric field. Bernal (ABA) and arbitrarily stacked FLG remain semimetallic, but rhombohedral (ABC) stacked FLG demonstrates a variable band gap. The maximum band gap in ABC stacked FLG decreases with increasing layer number and can be fitted by the relationship 螖_max = 1/(2.378 + 0.521N + 0.035N²) eV. The effective masses of carriers over a wide range around the maximum band gap point in ABC stacked FLG are comparable with that in AB bilayer graphene under zero field. It is therefore possible to fabricate an effective field effect transistor operating at room temperature with high carrier mobility out of ABC stacked FLG.