Optical conductivity in A3C60 (A=K, Rb)

J. van den Brink (1,2), O. Gunnarsson(1) and V. Eyert(1,3)
(1) Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany (2) Laboratory of Solid State and Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands (3) Hahn-Meitner-Institut, Glienicker Strasse 100, D-14109 Berlin, Germany

We study the optical conductivity in A3C60 (A =K, Rb). The effects of the electron-phonon interaction is included to lowest order in the coupling strength lambda. It is shown that this leads to a narrowing of the Drude peak by a factor (1+lambda) and a transfer of weight to a mid-infrared peak at somewhat larger energies than the phonon energy. Although this goes in the right direction, it is not sufficient to describe experiment.

Phys. Rev. B 57 , 2163 (1998).

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