Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides

Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides
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铁磷族化物和硫族化物多轨道模型中的轨道选择性莫特相

DOI:
10.1103/physrevb.96.125110
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发表时间:
2017-05
期刊:
影响因子:
3.7
通讯作者:
Qimiao Si
Qimiao Si
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Rong Yu;Qimiao Si

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人们越来越认识到,3d电子的多轨道性质对于正确描述铁基超导体正常态的电子态是重要的。早期对相关多轨道哈伯德模型的研究发现了一个轨道选择性莫特相,它锚定了整个相图中的轨道选择性行为。模型的一个重要特征是轨道是动力学耦合的-即杂化-彼此,这使得轨道选择性莫特相位特别不平凡。用U(1)从旋方法分析了具有非零轨道能级分裂的模型。在这里,我们开发了一个朗道自由能功能,以进一步阐明这个问题。我们从U(1)从自旋方法的微观分析中发现,位间自旋关联对于裸杂化振幅向零的重整化和伴随的轨道选择性Mott跃迁的实现是至关重要的.基于这一认识,我们讨论了从轨道间杂化和集体自旋相关之间的动力学竞争来研究轨道选择性Mott物理的其他方法。我们的研究结果表明,轨道选择莫特相的鲁棒性在多轨道模型适合于铁基超导体。
There is increasing recognition that the multiorbital nature of the 3d electrons is important to the proper description of the electronic states in the normal state of the iron-based superconductors. Earlier studies of the pertinent multiorbital Hubbard models identified an orbital-selective Mott phase, which anchors the orbital-selective behavior seen in the overall phase diagram. An important characteristics of the models is that the orbitals are kinetically coupled -- i.e. hybridized -- to each other, which makes the orbital-selective Mott phase especially nontrivial. A U(1) slave-spin method was used to analyze the model with nonzero orbital-level splittings. Here we develop a Landau free-energy functional to shed further light on this issue. We put the microscopic analysis from the U(1) slave-spin approach in this perspective, and show that the intersite spin correlations are crucial to the renormalization of the bare hybridization amplitude towards zero and the concomitant realization of the orbital-selective Mott transition. Based on this insight, we discuss additional ways to study the orbital-selective Mott physics from a dynamical competition between the interorbital hybridization and collective spin correlations. Our results demonstrate the robustness of the orbital-selective Mott phase in the multiorbital models appropriate for the iron-based superconductors.
连续连接到铁磷族超导体的莫特绝缘体
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