Abstract
A tight-binding model is used to study the role of impurities in a graphene ribbon. The graphene ribbon is made of lines of carbon atoms in an armchair or zigzag shape where the impurities are included in the ribbon substitutionally. The addition of a line of impurities opens up a gap in the energy spectrum. The size of it depends in a nonmonotonic way on the position of the impurity line, and also on the strength of the carbon-impurity interaction.
- Received 22 May 2007
DOI:https://doi.org/10.1103/PhysRevB.76.193409
©2007 American Physical Society
