Metal to insulator transition in epitaxial graphene induced by molecular doping

Details Metal to insulator transition in epitaxial graphene induced by molecular doping Metal to insulator transition in epitaxial graphene induced by molecular doping

2008-07-30

arxiv.org/abs/0807.4791v2

Phys. Rev. Lett. 101, 086402 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.086402

The capability to control the type and amount of charge carriers in a material and, in the extreme case, the transition from metal to insulator is one of the key challenges of modern electronics. By employing angle resolved photoemission spectroscopy (ARPES) we find that a reversible metal to insulator transition and a fine tuning of the charge carriers from electrons to holes can be achieved in epitaxial bilayer and single layer graphene by molecular doping. The effects of electron screening and disorder are also discussed. These results demonstrate that epitaxial graphene is suitable for electronics applications, as well as provide new opportunities for studying the hole doping regime of the Dirac cone in graphene.

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