Low-energy band structures of armchair ribbon-graphene hybrid systems

• Published in: Diamond and related materials 2011-07, Vol.20 (7), p.1026-1029
• Main Authors: Lee, C.H., Chen, S.C., Chen, R.B., Lin, M.F.
• Format: Article
• Language: English
• Subjects: Band structure of solids; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electronic properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Energy gap; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Graphene; Graphene nanoribbons; Hybrid systems; Materials science; Monolayer graphene; Nanocomposites; Nanomaterials; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Other topics in nanoscale materials and structures; Physics; Specific materials; Stacking; Surface and interface electron states; Surface states, band structure, electron density of states
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2011.06.008

The electronic properties of armchair ribbon-graphene hybrid systems are studied within the 2 p z tight-binding model. The geometric structures of graphene nanoribbons, such as the width ( N y ) and the period ( R y ) of the ribbons, greatly determine the band structures. Furthermore, the stacking arrangement between graphene nanoribbons and monolayer graphene also plays an important role in low-energy states. Energy gaps caused by AA- and AB-stacking are dependent on N y s and R y s differently. These geometric structure effects can be well identified by the density of states. ► The electronic properties are calculated by the tight-binding model. ► An energy gap is induced in the monolayer graphene by the periodically aligned graphene nanoribbons. ► The stacking arrangement between them also plays an important role in low-energy states.