| Issue |
EPL
Volume 80, Number 6, December 2007
|
|
|---|---|---|
| Article Number | 67007 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/80/67007 | |
| Published online | 13 November 2007 | |
Electron waves in chemically substituted graphene
1
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
Received:
29
August
2007
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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