On the correllation effect in Peierls-Hubbard chains

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 (...

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Bibliographic Details
Published in:arXiv.org 2002-10
Main Authors: Malek, J, S -L Drechsler, Flach, S, Jeckelmann, E, Kladko, K
Format: Article
Language:English
Subjects:
Chains
Dimerization
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0210349