Phase diagram of the one-dimensional extended attractive Hubbard model for large nearest-neighbor repulsion
A. A. Aligia
Abstract
We consider the extended Hubbard model with attractive on-site interaction U and nearest-neighbor repulsions V. We construct an effective Hamiltonian Heff for hopping t<<V and arbitrary U<0. Retaining the most important terms, Heff can be mapped onto two XXZ models, solved by the Bethe ansatz. The quantum phase diagram shows two Luttinger liquid phases and a region of phase separation between them. For density n<0.422 and U<-4, singlet superconducting correlations dominate at large distances. For some parameters, the results are in qualitative agreement with experiments in BaKBiO.
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