Electron waves in chemically substituted graphene

Details Electron waves in chemically substituted graphene Electron waves in chemically substituted graphene

2007-05-21

arxiv.org/abs/0705.3040v1

Europhysics Letters 80, 67007 (2007)

Physics

Condensed Matter

Materials Science

4 pages, 7 figures

Scientific paper

10.1209/0295-5075/80/67007

We present exact analytical and numerical results for the electronic spectra and the Friedel oscillations around a substitutional impurity atom in a graphene lattice. A chemical dopant in graphene introduces changes in the on-site potential as well as in the hopping amplitude. We employ a T-matrix formalism and find that disorder in the hopping introduces additional interference terms around the impurity that can be understood in terms of bound, semi-bound, and unbound processes for the Dirac electrons. These interference effects can be detected by scanning tunneling microscopy.

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