Volume 80, Number 6, December 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 November 2007|
Electron waves in chemically substituted graphene
Center of Physics and Departament of Physics, Universidade do Minho - P-4710-057, Braga, Portugal
2 Department of Physics and Astronomy, University of California - Riverside, CA 92521, USA
3 CFP and Departamento de Física, Faculdade de Ciências Universidade de Porto - 4169-007 Porto, Portugal
4 Department of Physics, Boston University - 590 Commonwealth Avenue, Boston, MA 02215, USA
Accepted: 21 October 2007
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.
PACS: 73.20.Hb – Impurity and defect levels; energy states of adsorbed species / 73.23.-b – Electronic transport in mesoscopic systems / 81.05.Uw – Carbon, diamond, graphite
© EPLA, 2007
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