Optical conductivity in the normal state fullerene superconductors

Details Optical conductivity in the normal state fullerene superconductors Optical conductivity in the normal state fullerene superconductors

2000-05-15

arxiv.org/abs/cond-mat/0005238v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.62.4440

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 $et$ $al$.

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