Graphyne: hexagonal network of carbon with versatile Dirac cone

Details Graphyne: hexagonal network of carbon with versatile Dirac cone Graphyne: hexagonal network of carbon with versatile Dirac cone

2011-12-13

arxiv.org/abs/1112.2932v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, 1 table

Scientific paper

We study alpha, beta, and gamma graphyne, a class of graphene allotropes with carbon triple bonds, using a first-principles density-functional method and tight-binding calculation. We find that graphyne has versatile Dirac cones and it is due to remarkable roles of the carbon triple bonds in electronic and atomic structures. The carbon triple bonds modulate effective hopping matrix elements and reverse their signs, resulting in Dirac cones with reversed chirality in alpha graphyne, momentum shift of the Dirac point in beta graphyne, and switch of the energy gap in gamma graphyne. Furthermore, the triple bonds provide chemisorption sites of adatoms which can break sublattice symmetry while preserving planar sp2-bonding networks. These features of graphyne open new possibilities for electronic applications of carbon-based two-dimensional materials and derived nanostructures.

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