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

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dc.creatorKoch, Erik
dc.creatorGunnarsson, Olle
dc.creatorMartin, Richard M.
dc.date1999-04-19
dc.date.accessioned2026-07-07T03:13:16Z
dc.date.available2026-07-07T03:13:16Z
dc.descriptionWe 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.
dc.description4 pages LaTeX with 4 eps figures; Computer Simulations Studies in Condensed Matter Physics XII, Eds.: D.P. Landau, S.P. Lewis, and H.B. Schuettler, Springer 1999; additional material available at http://www.mpi-stuttgart.mpg.de/docs/ANDERSEN/fullerene/
dc.identifierhttps://arxiv.org/abs/cond-mat/9904257
dc.identifierhttp://arxiv.org/abs/cond-mat/9904257
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/29236
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.subjectSuperconductivity
dc.titleScreening of a point charge: a fixed-node diffusion Monte Carlo study
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