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Ordered states in the disordered Hubbard model

机译:无序Hubbard模型中的有序状态

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The Hubbard model is studied in which disorder is introduced by putting the on-site interaction to zero on a fraction f of (impurity) sites of a square lattice. Using quantum Monte Carlo methods and dynamical mean-field theory we iind that antiferromagnetic long-range order is initially enhanced at half-filling and stabilized off half-filling by the disorder. The Mott-Hubbard charge gap of the pure system is broken up into two pieces by the disorder: one incompressible state remains at average density n = 1 and another can be seen slightly below n = 1 + f. Qualitative explanations are provided. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 39]
机译:研究了Hubbard模型,其中通过在正方形晶格的(杂质)位点的分数f上将现场相互作用设为零来引入无序。使用量子蒙特卡罗方法和动力学平均场理论,我们发现反铁磁的远程顺序最初在半填充时得到增强,并由无序现象稳定下来。纯系统的Mott-Hubbard电荷隙被这种紊乱分为两部分:一种不可压缩状态保持在平均密度n = 1,而另一种状态则可以看到略低于n = 1 + f。提供定性说明。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:39]

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