Excitonic effects in the optical spectra of graphene nanoribbons.

@article{Yang2007ExcitonicEI,
  title={Excitonic effects in the optical spectra of graphene nanoribbons.},
  author={Li Yang and Marvin L. Cohen and Steven G. Louie},
  journal={Nano letters},
  year={2007},
  volume={7 10},
  pages={
          3112-5
        }
}
We present a first-principles calculation of the optical properties of armchair-edged graphene nanoribbons (AGNRs) with many-electron effects included. The reduced dimensionality of the AGNRs gives rise to an enhanced electron-hole binding energy for both bright and dark exciton states (0.8-1.4 eV for GNRs with width approximately 1.2 nm) and dramatically changes the optical spectra owing to a near complete transfer of oscillator strength to the exciton states from the continuum transitions… 

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