Correlations in a two--chain Hubbard model

Details Correlations in a two--chain Hubbard model Correlations in a two--chain Hubbard model

1994-01-07

arxiv.org/abs/cond-mat/9401013v2

Physics

Condensed Matter

9 pages and 5 postscript figures, RevTeX 3.0, UCI-CMTHE-94-01 (revised version)

Scientific paper

10.1103/PhysRevLett.73.882

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.

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