Electronic Properties of Graphene Nanoribbon on Si(001) Substrate

Details Electronic Properties of Graphene Nanoribbon on Si(001) Substrate Electronic Properties of Graphene Nanoribbon on Si(001) Substrate

2008-07-06

arxiv.org/abs/0807.0883v3

Applied Physics Letters 95, 023107 (2009)

Physics

Condensed Matter

Materials Science

13 pages, 3 figures

Scientific paper

10.1063/1.3179426

We show by first-principles calculations that the electronic properties of zigzag graphene nanoribbons (Z-GNRs) adsorbed on Si(001) substrate strongly depend on ribbon width and adsorption orientation. Only narrow Z-GNRs with even rows of zigzag chains across their width adsorbed perpendicularly to the Si dimer rows possess an energy gap, while wider Z-GNRs are metallic due to width-dependent interface hybridization. The Z-GNRs can be metastably adsorbed parallel to the Si dimer rows, but show uniform metallic nature independent of ribbon width due to adsorption induced dangling-bond states on the Si surface.

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