Seeing many-body effects in single- and few-layer graphene: observation of two-dimensional saddle-point excitons.

@article{Mak2011SeeingME,
  title={Seeing many-body effects in single- and few-layer graphene: observation of two-dimensional saddle-point excitons.},
  author={Kin Fai Mak and Jie Shan and Tony F Heinz},
  journal={Physical review letters},
  year={2011},
  volume={106 4},
  pages={046401}
}
Significant excitonic effects were observed in graphene by measuring its optical conductivity in a broad spectral range including the two-dimensional π-band saddle-point singularities in the electronic structure. The strong electron-hole interactions manifest themselves in an asymmetric resonance peaked at 4.62 eV, which is redshifted by nearly 600 meV from the value predicted by ab initio GW calculations for the band-to-band transitions. The observed excitonic resonance is explained within a… CONTINUE READING
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