| Hubbard模型反铁磁相的电子相关 |
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| 引用本文： | 魏国柱,聂惠权,张开义.Hubbard模型反铁磁相的电子相关[J].东北大学学报(自然科学版),1989(4). |
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| 作者姓名： | 魏国柱 聂惠权 张开义 |
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| 作者单位： | 东北工学院物理系
(魏国柱，聂惠权)，东北工学院物理系(张开义) |
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| 摘 要： | 基于同一格点的电子相关,本文用局域方法研究了 Hubbard 模型的反铁磁相。在R=0,a 近似下,计算了与铁磁基态的序参量、能隙、局域磁矩和基态能量,给出了基态相图.与 R=0 近似所得的结果相比,对给定的 n和U,序参量、能隙及基态能量均变小;随U增加,反铁磁相的区域明显变小。
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| 关 键 词： | 电子相关 反铁磁相 基态相图 |
Electronic Correlation of Antiferromagnetic State in Hubbard Model |
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| Wei Guozhu,Nie Huiquan,Zhang Kaiyi.Electronic Correlation of Antiferromagnetic State in Hubbard Model[J].Journal of Northeastern University(Natural Science),1989(4). |
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| Authors: | Wei Guozhu Nie Huiquan Zhang Kaiyi |
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| Institution: | Wei Guozhu;Nie Huiquan;Zhang Kaiyi |
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| Abstract: | A local approach is introduced into investigation on antiferromagnetic statein Hubbard model since electrons are correlative at the same site. The orderparameter, gap, local moments and energy of correlated ground state arecalculated under conditions that R=0,a approximation, thus giving the groundstate phase diagram. The results show that, in comparison with those takingR=0 approximation, the order parameter, gap and energy of correlated groundstate are all decreased for the given n and U, and the region of antiferromag-netic ground state will be significantly reduced with the increasing U. |
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| Keywords: | electronic correlation antiferromagnetic state ground state diagram |
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