• 文献标题:   Field modulation in bilayer graphene band structure
  • 文献类型:   Article
  • 作  者:   RAZA H, KAN EC
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF PHYSICSCONDENSED MATTER
  • ISSN:   0953-8984 EI 1361-648X
  • 通讯作者地址:   Cornell Univ
  • 被引频次:   22
  • DOI:   10.1088/0953-8984/21/10/102202
  • 出版年:   2009

▎ 摘  要

Using an external electric field, one can modulate the band gap of Bernal stacked bilayer graphene by breaking the A-(B) over tilde symmetry. We analyze strain effects on the bilayer graphene using the extended Huckel theory and find that reduced interlayer distance results in higher band gap modulation, as expected. Furthermore, above about 2.5 angstrom interlayer distance, the band gap is direct, follows a convex relation with the electric field and saturates to a value determined by the interlayer distance. However, below about 2.5 angstrom, the band gap is indirect, the trend becomes concave and a threshold electric field is observed, which also depends on the stacking distance.