Friedel oscillations in graphene: Sublattice asymmetry in doping

J. A. Lawlor, S. R. Power, and M. S. Ferreira
Phys. Rev. B 88, 205416 – Published 13 November 2013

Abstract

Symmetry breaking perturbations in an electronically conducting medium are known to produce Friedel oscillations in various physical quantities of an otherwise pristine material. Here we show in a mathematically transparent fashion that Friedel oscillations in graphene have a strong sublattice asymmetry. As a result, the presence of impurities and/or defects may impact the distinct graphene sublattices very differently. Furthermore, such an asymmetry can be used to explain the recent observations that nitrogen atoms and dimers are not randomly distributed in graphene but prefer to occupy one of its two distinct sublattices. We argue that this feature is not exclusive of nitrogen and that it can be seen with other substitutional dopants.

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  • Received 13 September 2013

DOI:https://doi.org/10.1103/PhysRevB.88.205416

©2013 American Physical Society

Authors & Affiliations

J. A. Lawlor1, S. R. Power2,*, and M. S. Ferreira1,3

  • 1School of Physics, Trinity College Dublin, Dublin 2, Ireland
  • 2Center for Nanostructured Graphene (CNG), DTU Nanotech, Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
  • 3CRANN, Trinity College Dublin, Dublin 2, Ireland

  • *spow@nanotech.dtu.dk

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Issue

Vol. 88, Iss. 20 — 15 November 2013

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