Excitonic Effects on Optical Absorption Spectra of Doped Graphene

Details Excitonic Effects on Optical Absorption Spectra of Doped Graphene Excitonic Effects on Optical Absorption Spectra of Doped Graphene

2011-08-28

arxiv.org/abs/1108.5509v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 5 figures; Nano Lett., Article ASAP (2011)

Scientific paper

10.1021/nl201928g

We have performed first-principles calculations to study optical absorption spectra of doped graphene with many-electron effects included. Both self-energy corrections and electron-hole interactions are reduced due to the enhanced screening in doped graphene. However, self-energy corrections and excitonic effects nearly cancel each other, making the prominent optical absorption peak fixed around 4.5 eV under different doping conditions. On the other hand, an unexpected increase of the optical absorbance is observed within the infrared and visible-light frequency regime (1 ~ 3 eV). Our analysis shows that a combining effect from the band filling and electron-hole interactions results in such an enhanced excitonic effect on the optical absorption. These unique variations of the optical absorption of doped graphene are of importance to understand relevant experiments and design optoelectronic applications.

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