Optical conductivity in the normal state fullerene superconductors

Abstract

We calculate the optical conductivity, $\sigma (\omega )$, 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 is explicitely considered, and the vertex corection is included $a$ $la$ Nambu in calculating the renormalized Green's function. $\sigma (\omega )$ 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 $\sigma (\omega )$ is strongly suppressed due to the interactions and transfered to the mid-infrared region around and above 0.06 eV which is somewhat less pronounced and much broader compared with the expermental observation by DeGiorgi $et$ $al$.

6 pages, 4 figures. To be published in Physical Review B, July 15

References in corpus (1)

• Coulomb suppression of NMR coherence peak in fullerene superconductors

Cited by in corpus (2)

• Impurity effects on optical response in a finite band electronic system coupled to phonons
• Observation of phonon structure in electron density of states of normal metal