Abstract
The quantum conductance of graphene nanoribbons that include vacancy andadatom–vacancy defects is studied for both armchair and zigzag edge structures. Theconductance is calculated by using the Green’s function formalism combined with atight-binding method for the description of the system. Our results reveal that, owing tothe localized states that appear near the defect sites, the conductance of the defectednanoribbons generally decreases. We show that details of the conductance reductiondepend on the structure of the defect, its distance from the ribbon edges, and theribbon width. While some defect structures cause the conductance of the ribbonto vanish, some other defects have no effect on the conductance at the Fermienergy.
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