Journal
PHYSICAL REVIEW B
Volume 80, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.193411
Keywords
fine structure; graphene; optical conductivity; transparency
Funding
- Ames Laboratory [DE-AC02-07CH11358]
- Louisiana Board of Regents [LEQSF (2008-11)-RD-A-10]
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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.
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