Dielectric screening in doped Fullerides

Details Dielectric screening in doped Fullerides Dielectric screening in doped Fullerides

1998-04-07

arxiv.org/abs/cond-mat/9804077v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 eps figure included; to be published in the proceedings of the International Winterschool on Electronic Properties

Scientific paper

10.1063/1.56505

For conventional superconductors the electron-electron interaction is strongly reduced by retardation effects, making the formation of Cooper pairs possible. In the alkali-doped Fullerides, however, there are no strong retardation effects. But dielectric screening can reduce the electron-electron interaction sufficiently, if we assume that the random-phase approximation (RPA) is valid. It is not clear, however, if this assumption holds, since the alkali-doped Fullerides are strongly correlated systems close to a Mott transition. To test the validity of the RPA for these systems we have calculated the screening of a test charge using quantum Monte Carlo.

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