Crossover in the attractive one-dimensional Hubbard model for general electron concentrations

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題名:	Crossover in the attractive one-dimensional Hubbard model for general electron concentrations
作者:	Kocharian, A. N.;Yang, C.;Chiang, Y. L.;Kioussis, N.
貢獻者:	淡江大學物理學系
關鍵詞:	Attractive Hubbard model;Bethe-ansatz;Self-consistent field;Crossover
日期:	1999-01
上傳時間:	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
顯示於類別:	[物理學系暨研究所] 期刊論文

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