Screening of a point charge: a fixed-node diffusion Monte Carlo study

Details Screening of a point charge: a fixed-node diffusion Monte Carlo study Screening of a point charge: a fixed-node diffusion Monte Carlo study

1999-04-19

arxiv.org/abs/cond-mat/9904257v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages LaTeX with 4 eps figures; Computer Simulations Studies in Condensed Matter Physics XII, Eds.: D.P. Landau, S.P. Lewis,

Scientific paper

We study the static screening in a Hubbard-like model using fixed-node diffusion Monte Carlo. We find that the random phase approximation is surprisingly accurate even for metallic systems close to the Mott transition. As a specific application we discuss the implications of the efficient screening for the superconductivity in the doped Fullerenes. In the Monte Carlo calculations we use trial functions with two Gutzwiller-type parameters. To deal with such trial functions, we introduce a method for efficiently optimizing the Gutzwiller parameters, both in variational and in fixed-node diffusion Monte Carlo.

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