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VOLUME 87 (2008) | ISSUE 8 | PAGE 487
Electronic structure of negatively curved graphene
PACS: 73.22.-f, 73.22.-Dj
Abstract
We study the electronic structure of graphene in the presence of either sevenfolds or eightfolds by using a gauge field-theory model. The graphene sheet with topological defects is considered as a negative cone surface with infinite Gaussian curvature at the center. The density of electronic states is calculated for a single seven- and eightfold as well as for a pair of sevenfolds with different morphology. The density of states at the Fermi energy is found to be zero in all cases except two sevenfolds with translational factor M\neq 0.