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- W1488305941 abstract "Gap opening at the Dirac point of the single-layer graphene with periodic scalar and vector potentials has been theoretically investigated under the continuum model. The symmetry analysis indicates that the two-fold degeneracy at the Dirac point can be lifted when the potentials break both the chiral symmetry and the time-reversal symmetry. A gap equation at the Dirac point is obtained analytically with perturbation theory. It is shown that a mass term at the Dirac point would be generated by coupling of vector and scalar potentials. This gap equation could be considered as a criterion for gap opening at the Dirac point, which is confirmed by the numerical calculation. Furthermore, the bandgap from the gap equation agrees well with the exact result, when the applied potentials are weak." @default.
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- W1488305941 date "2012-01-01" @default.
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- W1488305941 title "Gap opening in single-layer graphene in the presence of periodic scalar and vector potentials within the continuum model" @default.
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- W1488305941 doi "https://doi.org/10.1016/j.physleta.2011.11.020" @default.
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