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Título: | Intrinsic spin-orbit interactions in flat and curved graphene nanoribbons |
Autor: | López-Sancho, María Pilar CSIC ORCID ; Muñoz, M. Carmen CSIC | Fecha de publicación: | 11-feb-2011 | Editor: | American Institute of Physics | Citación: | Physical Review B - Condensed Matter and Materials Physics 83 (2011) | Resumen: | [EN] Recent theoretical and experimental works on carbon nanotubes and graphene samples have revealed that spin-orbit interactions, though customarily ignored in carbon-based materials, are more important and complex than it was thought. We study the intrinsic spin-orbit coupling effects on graphene nanoribbons, both flat and bent. Calculations are performed within the tight-binding model with the inclusion of a four-orbital basis set; thereby the full symmetry of the honeycomb lattice and the hybridization of σ and π bands are considered. In addition to the zero-energy π-edge states, σ-derived edge states are found for the three investigated ribbon geometries. The σ states are also spin filtered and localized at the boundaries of the ribbons. The calculated spin-orbit splittings are larger for the σ- than for the π-derived edge states. Due to this enhancement, spin-orbit splittings of the σ states reach values of the order of a few Kelvin. These spin-filtered edge states are robust under σ-π hybridization and curvature effects. © 2011 American Physical Society. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevB.83.075406 | URI: | http://hdl.handle.net/10261/280395 | DOI: | 10.1103/PhysRevB.83.075406 | Identificadores: | doi: 10.1103/PhysRevB.83.075406 issn: 1098-0121 e-issn: 1550-235X |
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