Optical transparency of graphene as determined by the fine-structure constant

Details Optical transparency of graphene as determined by the fine-structure constant Optical transparency of graphene as determined by the fine-structure constant

2009-06-29

arxiv.org/abs/0906.5164v3

Phys. Rev. B 80, 193411 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures, Minor changes, published version with a new title

Scientific paper

The observed 97.7% optical transparency of graphene has been linked to the value 1/137 of the fine structure constant, by using results for noninteracting Dirac fermions. The agreement in three significant figures requires an explanation for the apparent unimportance of the Coulomb interaction. Using arguments based on Ward identities, the leading corrections to the optical conductivity due to the Coulomb interactions are correctly computed (resolving a subtle theoretical issue) and shown to amount to only 1-2%, corresponding to 0.03-0.04% in the transparency.

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