| Hubbard模型的局域方法三阶近似 |
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| 引用本文： | 李林,魏国柱,聂惠权,张开义.Hubbard模型的局域方法三阶近似[J].东北大学学报(自然科学版),1990(1). |
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| 作者姓名： | 李林 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
(李林，魏国柱，聂惠权)，东北工学院物理系(张开义) |
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| 摘 要： | 应用局域方法近似对Hubbard模型作了三阶计算。考虑到同格点及相邻格点的电子和自旋相关,计算了相关能、基态能和局域磁矩,结果表明:在U和n较大时,三阶计算结果对保留项的二阶计算结果的修正比对略去项的二阶计算结果的修正小得多,从而说明,在二阶计算中项的贡献是重要的,不能略去。保留项的二阶计算结果可用于一般精度的计算。
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| 关 键 词： | 局域方法 相关能 基态能 局域磁矩 Hubbard模型 |
Localization for Hubbard Model in Third Approximation |
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| Li Lin,Wei Guozhu,Nie Huiguan,Zhang Kaiyi.Localization for Hubbard Model in Third Approximation[J].Journal of Northeastern University(Natural Science),1990(1). |
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| Authors: | Li Lin Wei Guozhu Nie Huiguan Zhang Kaiyi |
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| Abstract: | Localization is applied to Hubbard model in third approximation. In view of the fact that electrons at the same and adjacent lattice points are correlative with spin,the correlation energy,ground-state energy and local magnetic moment are all calculated.As a result of the third approximation,it is shown that the corrected value for the second approximation with the term (OOH) is much less than that for the second approximation without The comparison proves that the term akes an important contribution to the second approximation and cannot be neglected. The result of the second approximation with ncluded may be used for the calculation within ordinary accuracies. |
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| Keywords: | localization correlation energy grouod-state energy local magnetic moment Hubbard moedl |
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