Correlations in a two--chain Hubbard model
凝聚态物理
2009-10-22 v2
摘要
Equal time spin--spin and pair field correlation functions are calculated for a two-chain Hubbard model using a density-matrix numerical renormalization group approach. At half-filling, the antiferromagnetic and pair field correlations both decay exponentially with the pair field having a much shorter correlation length. This is consistent with a gapped spin-liquid ground state. Below half--filling, the antiferromagnetic correlations become incommensurate and the spin gap persists. The pair field correlations appear to follow a power law decay which is similar to their non-interacting U=0 behavior.
引用
@article{arxiv.cond-mat/9401013,
title = {Correlations in a two--chain Hubbard model},
author = {R. M. Noack and S. R. White and D. J. Scalapino},
journal= {arXiv preprint arXiv:cond-mat/9401013},
year = {2009}
}
备注
9 pages and 5 postscript figures, RevTeX 3.0, UCI-CMTHE-94-01 (revised version)