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Electron waves in chemically substituted graphene

  • Author(s): Peres, NMR
  • Klironomos, FD
  • Tsai, SW
  • Santos, JR
  • Lopes Dos Santos, JMB
  • Castro Neto, AH
  • et al.
Abstract

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. © Europhysics Letters Association.

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