Exact ground-state properties and phase transitions within one-dimensional Hubbard model in magnetic field

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题名:	Exact ground-state properties and phase transitions within one-dimensional Hubbard model in magnetic field
作者:	Yang C;Kocharian AN;Chiang YL
贡献者:	物理系
日期:	2000
上传时间:	2009-12-14 11:40:15 (UTC+8)
摘要:	Cited: 0 References: 20 Citation Map Abstract: The phase diagram, the Bethe-ansatz ground-state properties, including the chemical potential mu, the spin (magnetic) and charge susceptibilities, are calculated within the one-dimensional Hubbard model in entire range of interaction strength (-infinity < U/t < + infinity), magnetic field (h greater than or equal to 0) and all electron concentrations (0 less than or equal to n less than or equal to 1). The continuous and smooth variation of mu with n and h in the vicinity of n = 1 points on the gapless character of charge excitations at U < <0 and provides rigorous upper and lower bounds for <mu>. The spin (magnetic) susceptibility chi at half-filling changes discontinuously as U --> 0 and is strongly enhanced by electron repulsion, comparing with that of the non-interacting case. The compressibility rc,h increases with n at U < 0 and shows non-monotonous behavior with a dramatic increase at U > 0. Variation of k(ch)(-1) in both repulsive and attractive cases qulitatively well reproduces corresponding behavior of charge stiffness.
關聯:	INTERNATIONAL JOURNAL OF MODERN PHYSICS B Volume: 14 Issue: 29-31 Pages: 3771-3776
显示于类别:	[光電物理系] 期刊論文

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