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Doping-driven metal-insulator transition in correlated electron systems with strong Hund's exchange coupling

机译:具有强Hund交换耦合的相关电子系统中掺杂驱动的金属-绝缘体跃迁

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摘要

We study the doping-driven Mott metal-insulator transition for multiorbital Hubbard models with Hund's exchange coupling at finite temperatures. As in the single-orbital Hubbard model, the transition is first order within dynamical mean-field theory, with a coexistence region where two solutions can be stabilized. We find that in the presence of finite Hund's coupling, the insulating phase is connected to a badly metallic phase, which extends to surprisingly large dopings. While fractional power-law behavior of the self-energies on the Matsubara axis is found on both sides of the transition, a regime with frozen local moments develops only on the branch connected to the insulating phase.
机译:我们研究了在有限温度下具有Hund交换耦合的多轨道Hubbard模型的掺杂驱动的Mott金属-绝缘体跃迁。像在单轨道哈伯德模型中一样,跃迁在动力学平均场理论中是一阶的,并且存在一个可以使两个解稳定的共存区域。我们发现,在存在有限洪德耦合的情况下,绝缘相连接到不良的金属相,从而扩展到了惊人的大掺杂。虽然在过渡的两侧都发现了自能量在松原轴上的分数幂定律行为,但具有冻结局部矩的状态仅在连接到绝缘相的分支上形成。

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  • 来源
    《Physical review》 |2019年第8期|085104.1-085104.1|共10页
  • 作者单位

    Ecole Polytech Inst Polytech Paris CNRS CPHT F-91128 Palaiseau France;

    UMR8213 CNRS ESPCI UPMC Lab Phys & Etud Mat Paris France;

    Ecole Polytech Inst Polytech Paris CNRS CPHT F-91128 Palaiseau France|Coll France 11 Pl Marcelin Berthelot F-75005 Paris France|European Theoret Spect Facil F-91128 Palaiseau France;

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