| Hubbard模型反铁磁相的局域方法三阶近似 |
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| 引用本文： | 聂惠权,魏国柱,张开义. Hubbard模型反铁磁相的局域方法三阶近似[J]. 东北大学学报(自然科学版), 1992, 0(4) |
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| 作者姓名： | 聂惠权 魏国柱 张开义 |
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| 作者单位： | 东北工学院物理系(聂惠权，魏国柱)，东北工学院物理系(张开义) |
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| 摘 要： | 利用局域方法,对Hubbard 模型反铁磁相进行三阶微扰计算。与二阶微扰计算结果相比较,反铁磁基态的序参量,能隙和局域磁矩在n 和U 都较大情况下有定量的修正,得到的基态相图反铁磁区域变得稍大一些。
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| 关 键 词： | 三阶近似 反铁磁相 基态相图 局域方法 局域磁矩 |
Third--Order Approximation in Local Approach to Antiferromagnetic State of Hubbard Model |
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| Nie Huiquan,Wei Guozhu,Zhang Kaiyi. Third--Order Approximation in Local Approach to Antiferromagnetic State of Hubbard Model[J]. Journal of Northeastern University(Natural Science), 1992, 0(4) |
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| Authors: | Nie Huiquan Wei Guozhu Zhang Kaiyi |
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| Affiliation: | Nie Huiquan;Wei Guozhu;Zhang Kaiyi |
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| Abstract: | Local approach is introduced into the calculation of third-orderperturbation to the antiferromagntic state of Hubbard model. Comparing withthe results from the second-order perturbation calculation, the ordering para-meter, energy gap and local magnetic moments are found corrected somewhatunder conditions that both n and U are relatively great, and the range ofantiferromagnetic state in ground state diagram increases slightly. |
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| Keywords: | third-order approximation antiferromagnetic state groundstate diagram local approach local magnetic moment |
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