Exact ground-state properties of one-dimensional Hubbard model in magnetic field

doi:10.1142/S0217979299003453

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/27501

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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
DOI:	10.1142/S0217979299003453
顯示於類別:	[物理學系暨研究所] 期刊論文

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