Gap opening and tuning in single-layer graphene with combined electric and magnetic field modulation

作者：Lin Xin; Wang Hai Long; Pan Hui; Xu Huai Zhe^*

来源：Chinese Physics B, 2011, 20(4): 047302.

DOI：10.1088/1674-1056/20/4/047302

• gap opening at Dirac point
• single-layer graphene
• electric and magnetic superlattice
• second-order perturbation

The energy band structure of single-layer graphene under one-dimensional electric and magnetic field modulation is theoretically investigated. The criterion for bandgap opening at the Dirac point is analytically derived with a two-fold degeneracy second-order perturbation method. It is shown that a direct or an indirect bandgap semiconductor could be realized in a single-layer graphene under some specific configurations of the electric and magnetic field arrangement. Due to the bandgap generated in the single-layer graphene, the Klein tunneling observed in pristine graphene is completely suppressed.

• 出版日期2011-4
• 单位北京航空航天大学