Abstract
Electrons in isolated graphene layers are a two-dimensional gas of massless Dirac Fermions. In realistic devices, however, the electronic properties are modified by elastic deformations, interlayer coupling and substrate interaction. Here, we unravel the electronic structure of noninteracting, doped graphene layers by revisiting the stage one graphite intercalation compound . To this end we apply angle-resolved photoemission spectroscopy and ab initio calculations. The full experimental dispersion is in excellent agreement with calculations of doped graphene once electron correlations are included at the level (Greens function of the Coulomb interaction ). This highlights that has negligible interlayer coupling allowing us to access the full experimental Dirac cone.
- Received 23 December 2008
DOI:https://doi.org/10.1103/PhysRevB.80.075431
©2009 American Physical Society
Synopsis
Dirac cone revealed
Published 8 September 2009
The full Dirac spectrum has been measured in intercalated graphite.
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