Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-03-12
Phys. Rev. B 78, 085432 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures
Scientific paper
10.1103/PhysRevB.78.085432
We compute the optical conductivity of graphene beyond the usual Dirac cone approximation, giving results that are valid in the visible region of the conductivity spectrum. The effect of next nearest neighbor hoping is also discussed. Using the full expression for the optical conductivity, the transmission and reflection coefficients are given. We find that even in the optical regime the corrections to the Dirac cone approximation are surprisingly small (a few percent). Our results help in the interpretation of the experimental results reported by Nair {\it et al.} [Science {\bf 320}, 1308 (2008)].
Geim Andre K.
Peres Nuno. M. R.
Stauber Tobias
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