Phase diagram of the one-dimensional extended attractive Hubbard model for large nearest-neighbor repulsion

Article

关键词: X-RAY-ABSORPTION;    ELECTRONIC-STRUCTURE;    SUPERCONDUCTIVITY;    BAPB1-XBIXO3;    BA1-XKXBIO3;    TEMPERATURE;    SYSTEM;   

DOI  :  10.1103/PhysRevB.61.7028

来源: SCIE

【 摘 要 】

We consider the extended Hubbard model with attractive on-site interaction U and nearest-neighbor repulsions V. We construct an effective Hamiltonian H-eff for hopping t << V and arbitrary U < 0. Retaining the most important terms, H-eff 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 Ba1-xKxBiO3.

【 授权许可】

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