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Magnetic phase diagram of the anisotropic multi-band Hubbard model

机译:各向异性多频带Hubbard模型的磁相图

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Using quantum Monte Carlo (QMC) simulations we determine the magnetic phase diagram of the anisotropic two-band Hubbard model within the dynamical mean-field theory (DMFT) in the important intermediate-coupling regime. We compare the QMC predictions with exact results from second-order weak- and strong-coupling perturbation theory. We find that the orbital-selective Mott transition (OSMT), which occurs in the fully frustrated case, is completely hidden in the antiferromagnetic (AF) ground state of the model. On the basis of our results, we discuss possible mechanisms of frustration. We also demonstrate the close relationship of the physics of the two-band Hubbard model in the orbital-selective Mott (OSM) phase to the Falicov-Kimball model.
机译:使用量子蒙特卡洛(QMC)模拟,我们在重要的中间耦合机制中的动态平均场论(DMFT)中确定了各向异性两波段Hubbard模型的磁相图。我们将QMC预测与二阶弱耦合和强耦合微扰理论的精确结果进行比较。我们发现在完全沮丧的情况下发生的轨道选择性莫特跃迁(OSMT)被完全隐藏在模型的反铁磁(AF)基态中。根据我们的结果,我们讨论了挫折的可能机制。我们还证明了在轨道选择莫特(OSM)阶段的两波段Hubbard模型的物理学与Falicov-Kimball模型的密切关系。

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