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    题名: Crossover in the attractive one-dimensional Hubbard model for general electron concentrations
    作者: Kocharian, A. N.;Yang, C.;Chiang, Y. L.;Kioussis, N.
    贡献者: 淡江大學物理學系
    关键词: Attractive Hubbard model;Bethe-ansatz;Self-consistent field;Crossover
    日期: 1999-01
    上传时间: 2013-07-09 15:11:01 (UTC+8)
    出版者: Amsterdam: Elsevier BV * North-Holland
    摘要: The crossover and the ground-state properties in the attractive Hubbard model are studied using the exact Bethe-ansatz equations and the self-consistent field (SCF) approach with renormalized chemical potential. The exact and the SCF results for the ground-state energy, the concentration of double occupied sites D, the chemical potential μ and the kinetic energy are in good agreement for all band fillings n and a wide range of the coupling strength -U/t. The SCF theory in one dimension suggests a smooth crossover from the BCS superconductivity to the superfluidity of local pairs under variation of -U/t and n. We found a simple relationship between D, n and the BCS order parameter.
    關聯: Physica B: Condensed Matter 259-261, pp.739-741
    DOI: 10.1016/S0921-4526(98)00933-8
    显示于类别:[物理學系暨研究所] 期刊論文

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