On the correllation effect in Peierls-Hubbard chains

Details On the correllation effect in Peierls-Hubbard chains On the correllation effect in Peierls-Hubbard chains

2002-10-16

arxiv.org/abs/cond-mat/0210349v1

Physics

Condensed Matter

Strongly Correlated Electrons

7pages,4figures(6eps-files)

Scientific paper

10.1143/JPSJ.72.2277

We reexamine the dimerization, the charge and the spin gaps of a half-filled Peierls-Hubbard chain by means of the incremental expansion technique. Our numerical findings are in significant quantitative conflict with recently obtained results by M. Sugiura and Y. Suzumura [J. Phys. Soc. Jpn. v. 71 (2002) 697] based on a bosonization and a renormalization group method, especially with respect to the charge gap. Their approach seems to be valid only in the weakly correlated case.

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