Excitonic effects on the optical response of graphene and bilayer graphene.

  title={Excitonic effects on the optical response of graphene and bilayer graphene.},
  author={Li Yang and J. Deslippe and C. Park and M. Cohen and S. Louie},
  journal={Physical review letters},
  volume={103 18},
  • Li Yang, J. Deslippe, +2 authors S. Louie
  • Published 2009
  • Medicine, Physics
  • Physical review letters
  • We present first-principles calculations of many-electron effects on the optical response of graphene, bilayer graphene, and graphite employing the GW-Bethe Salpeter equation approach. We find that resonant excitons are formed in these two-dimensional semimetals. The resonant excitons give rise to a prominent peak in the absorption spectrum near 4.5 eV with a different line shape and significantly redshifted peak position from those of an absorption peak arising from interband transitions in an… CONTINUE READING

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