Competition between antiferromagnetic and charge-density-wave order in the half-filled Hubbard-Holstein model

E. A. Nowadnick, S. Johnston, B. Moritz, R. T. Scalettar, T. P. Devereaux

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43 Scopus citations

Abstract

We present a determinant quantum Monte Carlo study of the competition between instantaneous on-site Coulomb repulsion and retarded phonon-mediated attraction between electrons, as described by the two-dimensional Hubbard-Holstein model. At half filling, we find a strong competition between antiferromagnetism (AFM) and charge-density-wave (CDW) order. We demonstrate that a simple picture of AFM-CDW competition that incorporates the phonon-mediated attraction into an effective-U Hubbard model requires significant refinement. Specifically, retardation effects slow the onset of charge order so that CDW order remains absent even when the effective U is negative. This delay opens a window where neither AFM nor CDW order is well established and where there are signatures of a possible metallic phase.

Original languageEnglish (US)
Article number246404
JournalPhysical Review Letters
Volume109
Issue number24
DOIs
StatePublished - Dec 10 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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