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    題名: Bose condensation and electron pairing in one-dimensional Hubbard model
    作者: Kocharian, A. N.;楊棨;Yang, Chi;Chiang, Y. L.
    貢獻者: 淡江大學物理學系
    關鍵詞: Hubbard model;Ground-state;Bethe-ansatz;BCS pairing;Electron-hole pairing;Bose condensation;Crossover
    日期: 1999-12-20
    上傳時間: 2009-12-31 10:12:51 (UTC+8)
    出版者: World Scientific Publishing
    摘要: The ground-state properties in one-dimensional Hubbard model with on-site attraction and repulsion of electrons in the presence of magnetic field h are calculated by means of the exact Bethe-ansatz formalism and the generalized self-consistent field (GSCF) approach for general electron concentrations n and arbitrary interaction strength. The ground-state properties, including the energy, the average spin (magnetization) and the kinetic energy are compared over a wide range of parameter space. The GSCF theory is in qualitative and in some cases in good quantitative agreement with the exact results. The GSCF theory at U≤0 (or U≥0) differentiates the spin (or charge) energy gap from the BCS (or antiferromagnetic) order parameter and suggests a smooth crossover from the phase with the itinerant BCS-like behavior to the Bose condensation regime of the local pairs.
    關聯: International Journal of Modern Physics B 13(29-31), pp.3538-3545
    DOI: 10.1142/S0217979299003386
    顯示於類別:[物理學系暨研究所] 期刊論文

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