标题： 莫特转变在准一维系统中 显示英文标题

标题： Mott Transition in Quasi-One-Dimensional Systems

摘要： 我们报告了密度矩阵重整化群方法在半填充空间各向异性二维Hubbard模型中的应用。 我们发现由横向跃迁参数$t_y$引起的解禁闭相变，从绝缘体到金属。 因此，如果在金属相中固定$t_y$，增加相互作用$U$会导致在有限临界值$U$的金属到绝缘体相变。 这与弱耦合Hartree-Fock理论相反，该理论预测对于任何$U>0$都会诱导出由嵌套引起的反铁磁绝缘体。 显示英文摘要

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 $U>0$.