Inelastic energy loss measurements of the 0.5 eV charge carrier plasmon in K3C60 are presented, showing that the plasmon has a very large broadening but a negligible dispersion. The response function is calculated in a self-consistent, conserving approximation, showing that the plasmon broadening can be explained in terms of a decay in electron hole pair(s) under the emission of phonon(s). The negligible plasmon dispersion can be understood within the random phase approximation. Local-field effects tend to give a large negative dispersion, which is compensated by interband effects.
 

Physics and Chemistry of Fullerenes and Derivatives. Proceedings of the International Winterschool on Electronic Properties of Novel Materials Editor(s): Kuzmany, H.; Fink, J.; Mehring, M.; Roth, S. Singapore: World Scientific, 1995. p.402-7 of xvi+589 pp. 14 refs. Conference: Kirchberg, Austria, 5-12 March 1995 ISBN: 981-02-2380-3.