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

TitleOptical transparency of graphene as determined by the fine-structure constant
Publication TypeJournal Article
Year of Publication2009
AuthorsSheehy DE, Schmalian J
Journal TitlePhysical Review B
Volume80
Pages193411
Date Published11/01
ISBN Number1098-0121
Accession NumberISI:000272311000030
Keywordsfermi-liquid behavior, fine structure, graphene, optical conductivity, transparency
Abstract

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 theoretical dispute) and shown to amount to only 1%-2%, corresponding to 0.03%-0.04% in the transparency.

URL<Go to ISI>://000272311000030
DOI10.1103/Physrevb.80.193411