CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Gap opening and tuning in single-layer graphene with combined electric and magnetic field modulation |
Lin Xin(林鑫), Wang Hai-Long(王海龙), Pan Hui(潘晖), and Xu Huai-Zhe(许怀哲)† |
Department of Physics, Beihang University, Beijing 100191, China |
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Abstract 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.
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Received: 09 December 2010
Revised: 08 January 2011
Accepted manuscript online:
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PACS:
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73.43.Cd
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(Theory and modeling)
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73.61.Wp
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(Fullerenes and related materials)
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73.50.Bk
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(General theory, scattering mechanisms)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60776067 and 10974011). |
Cite this article:
Lin Xin(林鑫), Wang Hai-Long(王海龙), Pan Hui(潘晖), and Xu Huai-Zhe(许怀哲) Gap opening and tuning in single-layer graphene with combined electric and magnetic field modulation 2011 Chin. Phys. B 20 047302
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