Imaging orbital-selective quasiparticles in the Hund's metal state of FeSe
Imaging orbital-selective quasiparticles in the Hund's metal state of FeSe
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DOI：
10.1038/s41563-018-0151-0
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发表时间：
2018-10-01
期刊：
影响因子：
41.2
通讯作者：
Davis, J. C. Seamus
中科院分区：
文献类型：
--
作者：
Kostin, A.;Sprau, P. O.;Davis, J. C. Seamus
从母体Mott绝缘体相出现的强电子关联是铜基高温超导性的关键。相比之下，铁基高温超导体的母相绝不是相关绝缘体。然而，这种区别可能是欺骗性的，因为Fe有五个活化d轨道，而Cu只有一个。理论上，这种轨道多重性可以产生洪德金属态，其中Fe自旋的排列抑制了轨道间的波动，产生轨道选择性强相关性。与不同的Fe轨道m相关联的准粒子的谱权Z（m）应该是完全不同的。在这里，我们使用准粒子散射干涉解决轨道内容，探索这些预测FeSe。准粒子Z（m）的强烈的轨道选择性差异的特征出现在宽能量范围内的所有可检测带上。此外，准粒子干涉振幅揭示了Z（xy）
Strong electronic correlations, emerging from the parent Mott insulator phase, are key to copper-based high-temperature superconductivity. By contrast, the parent phase of an iron-based high-temperature superconductor is never a correlated insulator. However, this distinction may be deceptive because Fe has five actived d orbitals while Cu has only one. In theory, such orbital multiplicity can generate a Hund's metal state, in which alignment of the Fe spins suppresses inter-orbital fluctuations, producing orbitally selective strong correlations. The spectral weights Z(m) of quasiparticles associated with different Fe orbitals m should then be radically different. Here we use quasiparticle scattering interference resolved by orbital content to explore these predictions in FeSe. Signatures of strong, orbitally selective differences of quasiparticle Z(m) appear on all detectable bands over a wide energy range. Further, the quasiparticle interference amplitudes reveal that Z(xy) < Z(xz)