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Interplay between symmetry and spin-orbit coupling on graphene nanoribbons

AuthorsSantos, Hernán; Muñoz, M. Carmen ; López-Sancho, María Pilar ; Chico, Leonor
Issue Date2013
PublisherAmerican Physical Society
CitationPhysical Review B 87: 235402 (2013)
AbstractWe study the electronic structure of chiral and achiral graphene nanoribbons with symmetric edges, including curvature and spin-orbit effects. Curved ribbons show spin-split bands, whereas flat ribbons present spin-degenerate bands. We show that this effect is due to the breaking of spatial inversion symmetry in curved graphene nanoribbons, while flat ribbons with symmetric edges possess an inversion center, regardless of their having chiral or achiral edges. We find an enhanced edge-edge coupling and a substantial gap in narrow chiral nanoribbons, which is not present in zigzag ribbons of similar width. We attribute these size effects to the mixing of the sublattices imposed by the edge geometry, yielding a behavior of chiral ribbons that is distinct from those with pure zigzag edges. © 2013 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.87.235402
Identifiersdoi: 10.1103/PhysRevB.87.235402
issn: 1098-0121
e-issn: 1550-235X
Appears in Collections:(ICMM) Artículos
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