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Real part of the optical conductivity of single layer graphene as a function of the Fermi level EF (a), the carrier scattering time τ (b), and the broadening of the interband transition Γ (c). Insets: optical conductivity in the low wavenumber limit. Thin solid lines: intraband conductivity. Dashed lines: interband conductivity. Bold lines: total optical conductivity. In (a,b), Γ = 18 meV.
