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Abstract

The interplay of electron-phonon coupling and strong electronic correlations is studied in the frame of the 2-dimensional Hubbard-Holstein model. Static and dynamic properties are determined by quantum Monte Carlo simulations and by Migdal-Eliashberg theory. The comparison allows us to assess the diagrammatic approach. The competition between the phonon-mediated electron-electron attraction and the local Coulomb repulsion leads to a rich phase diagram, which we study in detail for a wide range of parameters. We address the question, to which extent the systems can be described by an effective negative-U Hubbard model.

Additional information

Authors: BERGER E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);VALASEK P, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);VON DER LINDEN W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article : Physical Review B, Vol. 52 (1995), No. 7, pp. 4805-4814
Record Number: 199512134 / Last updated on: 1996-01-15
Category: PUBLICATION
Original language: en
Available languages: en