Robust zero-averaged wave-number gap inside gapped graphene superlattices
Abstract
In this paper, the electronic band structures and its transport properties in the gapped graphene superlattices, with one-dimensional (1D) periodic potentials of square barriers, are systematically investigated. It is found that a zero averaged wave-number (zero-k ) gap is formed inside the gapped graphene-based superlattices, and the condition for obtaining such a zero-k gap is analytically presented. The properties of this zero-k gap including its transmission, conductance and Fano factor are studied in detail. Finally it is revealed that the properties of the electronic transmission, conductance and Fano factor near the zero-k gap are very insensitive to the structural disorder for the finite graphene-based periodic-barrier systems.
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