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

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

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...

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Veröffentlicht in:Chinese physics B 2011-04, Vol.20 (4), p.446-455
1. Verfasser: 林鑫 王海龙 潘晖 许怀哲
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摄动法
狄拉克
磁场调制
结构理论
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description 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.
doi_str_mv 10.1088/1674-1056/20/4/047302
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subjects 摄动法
狄拉克
磁场调制
结构理论
title Gap opening and tuning in single-layer graphene with combined electric and magnetic field modulation
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