Abstract
We calculate the optical conductivity $\ensuremath{\sigma}(\ensuremath{\omega})$ in the normal-state fullerene superconductors by self-consistently including the impurity scatterings, the electron-phonon, and electron-electron Coulomb interactions. The finite bandwidth of the fullerenes and the vertex corrections are explicitly considered in calculating the renormalized Green's function. $\ensuremath{\sigma}(\ensuremath{\omega})$ is obtained by calculating the current-current correlation function with the renormalized Green's function in the Matsubara frequency and then performing analytic continuation to the real frequency at finite temperature. The Drude weight in $\ensuremath{\sigma}(\ensuremath{\omega})$ is strongly suppressed due to the interactions and transfered to the mid-infrared region around and above $0.06\mathrm{eV},$ which is somewhat less pronounced and much broader compared with the experimental observation by DeGiorgi et al.
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