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arXiv 1105.0150cond-mat.str-el
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准一维系统的Mott相变

Mott Transition in Quasi-One-Dimensional Systems

S. Moukouri, Eitan Eidelstein

摘要:

我们报告了密度矩阵重整化群方法在空间各向异性二维半填充哈伯德模型中的应用。我们发现了由横向跳跃参数$t_y$引起的从绝缘体到金属的退禁闭跃迁。因此,如果$t_y$固定在金属相中,则增加相互作用$U$导致在有限临界$U$下的金属到绝缘体转变。这与弱耦合Hartree-Fock理论相反,该理论预测任何$U>0$都有嵌套诱导的反铁磁绝缘体。

英文摘要:

We report the application of the density-matrix renormalization group method to a spatially anisotropic two-dimensional Hubbard model at half-filling. We find a deconfinement transition induced by the transverse hopping parameter $t_y$ from an insulator to a metal. Therefore, if $t_y$ is fixed in the metallic phase, increasing the interaction $U$ leads to a metal-to-insulator transition at a finite critical $U$. This is in contrast to the weak-coupling Hartree-Fock theory which predicts a nesting induced antiferromagnetic insulator for any $U>0$.

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