Two-dimensional Hubbard-Holstein model

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

Research output: Contribution to journalArticleResearchpeer-review

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.
Original languageEnglish
Pages (from-to)4806
Number of pages1
JournalPhysical Review / B
Volume52
Issue number7
DOIs
Publication statusPublished - 1995

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Hubbard model
Electrons
electrons
dynamic characteristics
Phase diagrams
attraction
phase diagrams
electronics
simulation

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Two-dimensional Hubbard-Holstein model. / Berger, E.; Valášek, P.; von der Linden, W.

In: Physical Review / B, Vol. 52, No. 7, 1995, p. 4806.

Research output: Contribution to journalArticleResearchpeer-review

Berger, E. ; Valášek, P. ; von der Linden, W. / Two-dimensional Hubbard-Holstein model. In: Physical Review / B. 1995 ; Vol. 52, No. 7. pp. 4806.
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