Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy

Details Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy

2007-11-15

arxiv.org/abs/0711.2523v2

Physics

Condensed Matter

Materials Science

18 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.235416

Graphene grown epitaxially on SiC has been proposed as a material for carbon-based electronics. Understanding the interface between graphene and the SiC substrate will be important for future applications. We report the ability to image the interface structure beneath single-layer graphene using scanning tunneling microscopy. Such imaging is possible because the graphene appears transparent at energies of 1 eV above or below the Fermi energy. Our analysis of calculations based on density functional theory shows how this transparency arises from the electronic structure of a graphene layer on a SiC substrate.

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