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Article
Modification of the G-phonon mode of graphene by nitrogen doping
Faculty Publications from Nebraska Center for Materials and Nanoscience
  • Pavel V. Lukashev, University of Nothern Iowa
  • Liuyan Zhao, Columbia University
  • Tula R. Paudel, University of Nebraska-Lincoln
  • Theanne Schiros, Columbia University
  • Noah Hurley, University of Northern Iowa
  • Evgeny Y Tsymbal, University of Nebraska-Lincoln
  • Aron Pinczuk, Columbia University
  • Abhay Pasupathy, Columbia University
  • Rui He, University of Northern Iowa
Date of this Version
1-1-2016
Citation

APPLIED PHYSICS LETTERS 108, 041907 (2016)

http://dx.doi.org/10.1063/1.4940910

Comments

Copyright 2016 AIP Publishing LLC

Abstract
The effect of nitrogen doping on the phonon spectra of graphene is analyzed. In particular, we employ first-principles calculations and scanning Raman analysis to investigate the dependence of phonon frequencies in graphene on the concentration of nitrogen dopants. We demonstrate that the G phonon frequency shows oscillatory behavior as a function of nitrogen concentration. We analyze different mechanisms which could potentially be responsible for this behavior, such as Friedel charge oscillations around the localized nitrogen impurity atom, the bond length change between nitrogen impurity and its nearest neighbor carbon atoms, and the long-range interactions of the nitrogen point defects. We show that the bond length change and the long range interaction of point defects are possible mechanisms responsible for the oscillatory behavior of the G frequency as a function of nitrogen concentration. At the same time, Friedel charge oscillations are unlikely to contribute to this behavior.
Citation Information
Pavel V. Lukashev, Liuyan Zhao, Tula R. Paudel, Theanne Schiros, et al.. "Modification of the G-phonon mode of graphene by nitrogen doping" (2016)
Available at: http://works.bepress.com/rui-he/12/