Competing Orderings in an Extended Falicov-Kimball Model

Details Competing Orderings in an Extended Falicov-Kimball Model Competing Orderings in an Extended Falicov-Kimball Model

2005-06-07

arxiv.org/abs/cond-mat/0506159v2

Phys. Rev. B 72, 125122 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, 5 pages, 4 figures; expanded and corrected, typos added, references added

Scientific paper

10.1103/PhysRevB.72.125122

We present a Hartree-Fock study of the Falicov-Kimball model extended by both on-site and non-local hybridization. We examine the interplay between excitonic effects and the charge-density wave (CDW) instability known to exist at zero hybridization. It is found that the CDW state remains stable in the presence of finite hybridization; for on-site hybridization the Coulomb interaction nevertheless strongly enhances the excitonic average above its value in the noninteracting system. In contrast, for non-local hybridization, we observe no such enhancement of the excitonic average or a spontaneous on-site hybridization potential. Instead, we find only a significant suppression of the excitonic correlations in the CDW state. A phenomenological Ginzburg-Landau analysis is also provided to understand the interplay.

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