Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-03-03
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 figures
Scientific paper
The electronic transport properties and band structures for the graphene-based one-dimensional (1D) superlattices with periodic squared potentials are investigated. It is found that a new Dirac point is formed, which is exactly located at the energy which corresponds to the zero (volume) averaged wavenumber inside the 1D periodic potentials. The location of such a new Dirac point is robust against variations in the lattice constants, and it is only dependent on the ratio of potential widths. The zero-averaged wavenumber gap associated with the new Dirac point is insensitive to both the lattice constant and the structural disorder, and the defect mode in the zero-averaged wavenumber gap is weakly dependent on the insident angles of carriers.
Wang Li-Gang
Zhu Shi-Yao
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