Signatures of Mottness and Hundness in archetypal correlated metals
Signatures of Mottness and Hundness in archetypal correlated metals
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DOI：
10.1038/s41467-019-10257-2
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发表时间：
2019-06-20
影响因子：
16.6
通讯作者：
Kotliar, Gabriel
中科院分区：
文献类型：
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作者：
Deng, Xiaoyu;Stadler, Katharina M.;Kotliar, Gabriel
多轨道材料的物理性质不仅取决于价电子之间有效相互作用的强度，还取决于其类型。强相关性是由捕捉电荷之间库仑斥力的莫特物理学或对齐不同轨道中的自旋的亨德物理学引起的。我们确定了标记轨道和自旋通道中筛选的开始和完成的四种能量尺度。这些尺度的差异表现在局部光谱以及电荷、自旋和轨道磁化率的温度依赖性上，提供了区分莫特和洪德物理学的清晰特征。我们通过对两种典型的强相关材料的现实研究来说明这些概念，并通过模型哈密顿研究证实了我们结论的普遍性。
Physical properties of multi-orbital materials depend not only on the strength of the effective interactions among the valence electrons but also on their type. Strong correlations are caused by either Mott physics that captures the Coulomb repulsion among charges, or Hund physics that aligns the spins in different orbitals. We identify four energy scales marking the onset and the completion of screening in orbital and spin channels. The differences in these scales, which are manifest in the temperature dependence of the local spectrum and of the charge, spin and orbital susceptibilities, provide clear signatures distinguishing Mott and Hund physics. We illustrate these concepts with realistic studies of two archetypal strongly correlated materials, and corroborate the generality of our conclusions with a model Hamiltonian study.