| Hubbard-Anderson无序模型的近似解 |
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| 引用本文： | 杜安,赵宝华. Hubbard-Anderson无序模型的近似解[J]. 东北大学学报(自然科学版), 1991, 0(4) |
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| 作者姓名： | 杜安 赵宝华 |
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| 作者单位： | 东北工学院物理系(杜安),东北工学院物理系(赵宝华) |
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| 摘 要： | 用 Mean-field hopping 的近似方法研究了同格点电子相关对 Anderson无序系统的影响。在半满带下得到了金属-绝缘转变相图。结果表明,同格点的吸引作用(U<0)有利于 Anderson 局域态的形成;排斥的相互作用(U>0)在低温下破坏Anderson 局域态的形成。还发现,很小的无序就需要较大的相关能来实现 Hubbard绝缘相。
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| 关 键 词： | Anderson无序 局域态 Hubbard绝缘相 “淬火”平均 |
An Approximate Solution to Hubbard-Anderson Model |
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| Du An,Zhao Baohua. An Approximate Solution to Hubbard-Anderson Model[J]. Journal of Northeastern University(Natural Science), 1991, 0(4) |
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| Authors: | Du An Zhao Baohua |
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| Abstract: | The effect of on-site electron correlation on Anderson's disorder system was studied by use of an approximate solution so-called Mean-field hopping. Phase diagrams of metal-insulator transition are obtained subject to a half-filled band. The results show that for the formation of Anderson's localized state, the on-site attractive interaction (U<0) will favour it but the repulsive interaction (U> will destroy it at a low temperature. Also, great correlation energy is required for the weak disorder to attain to Hubbard insulating phase. |
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| Keywords: | Anderson disorder, localized states,Hubbard insulating phase, " quenched-type" average. |
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