The properties of the two-chain Hubbard Model doped away from half-filling are investigated. The charge gap is found to vanish, but a finite spin gap exists over a range of interchain hopping strength t⊥. In this range, there are modified dx2−y2--like pairing correlations whose strength is correlated with the size of the spin gap. It is found that the pair field correlations are enhanced by the onsite Coulomb interaction U.
@article{arxiv.cond-mat/9409065,
title = {The Doped Two Chain Hubbard Model},
author = {R. M. Noack and S. R. White and D. J. Scalapino},
journal= {arXiv preprint arXiv:cond-mat/9409065},
year = {2009}
}
Comments
10 pages and 5 postscript figures, RevTeX 3.0, UCI-CMTHE-94-05