Two-dimensional Hubbard-Holstein model

E. Berger, P. Valášek, and W. von der Linden
Phys. Rev. B 52, 4806 – Published 15 August 1995
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Abstract

The interplay of electron-phonon coupling and strong electronic correlations is studied in the frame of the two-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.

  • Received 13 March 1995

DOI:https://doi.org/10.1103/PhysRevB.52.4806

©1995 American Physical Society

Authors & Affiliations

E. Berger, P. Valášek, and W. von der Linden

  • Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85740 Garching bei München, Germany

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Issue

Vol. 52, Iss. 7 — 15 August 1995

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