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    題名: Exact ground-state properties of one-dimensional Hubbard model in magnetic field
    作者: 楊棨;Yang, Chi;Kocharian, A. N.;Chiang, Y. L.
    貢獻者: 淡江大學物理學系
    關鍵詞: Hubbard model;Exact solution;Ground-state properties;Superconductivity;Magnetism;Phase diagram
    日期: 1999-12-20
    上傳時間: 2009-12-31 10:12:56 (UTC+8)
    出版者: World Scientific Publishing
    摘要: The exact phase diagram and the ground-state properties of the one-dimensional Hubbard model with arbitrary on-site interaction of electrons are calculated over a wide range of magnetic field and electron concentrations by means of the Bethe-ansatz formalism. The ground-state properties, including the total energy, the average spin (magnetization) and spin (magnetic) susceptibility are investigated for both signs of the interaction strength U/t. The critical behavior near the onset of magnetization and magnetic saturation are also analyzed. At the onset of magnetization and near the magnetic saturation the spin susceptibility χ diverges at all U/t for half-filling case n=1, whereas for n≠1 it is always finite. The reverse susceptibility χ-1(U) exhibits anomalous hump, which increases with h or n, and shows discontinuity as U/t→±0 at infinitesimal h→0. The analytical results for the ground-state properties in strong and weak interaction limits are in full agreement with our numerical calculations.
    關聯: International Journal of Modern Physics B 13(29-31), pp.3573-3578
    顯示於類別:[物理學系暨研究所] 期刊論文

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