Anomalous High-Energy Waterfall-Like Electronic Structure in 5 d Transition Metal Oxide Sr2IrO4 with a Strong Spin-Orbit Coupling.
Anomalous High-Energy Waterfall-Like Electronic Structure in 5 d Transition Metal Oxide Sr2IrO4 with a Strong Spin-Orbit Coupling.
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DOI：
10.1038/srep13036
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发表时间：
2015-08-12
影响因子：
4.6
通讯作者：
Zhou XJ
中科院分区：
文献类型：
--
作者：
Liu Y;Yu L;Jia X;Zhao J;Weng H;Peng Y;Chen C;Xie Z;Mou D;He J;Liu X;Feng Y;Yi H;Zhao L;Liu G;He S;Dong X;Zhang J;Xu Z;Chen C;Cao G;Dai X;Fang Z;Zhou XJ
Sr2IrO4 的低能电子结构已通过有效的 Jeff = 1/2 Mott 绝缘体模型得到了很好的研究和理解。然而，对其高能电子行为的研究却很少。在这里，我们报告了对 Sr2IrO4 中异常高能电子结构的新观察。通过在较宽的能量范围内对 Sr2IrO4 进行高分辨率角分辨光电发射测量，我们首次揭示了高能电子结构显示出不寻常的近垂直带，这些带在很大的能量范围内延伸。这种异常的高能行为类似于在铜酸盐超导体中观察到的高能瀑布特征。虽然强电子相关性在铜酸盐超导体中产生高能瀑布特征中起着重要作用，但Sr2IrO4中高能异常的揭示，表现出强自旋轨道耦合和中等电子相关性，指出了产生奇异电子激发的未知且新颖的途径。
The low energy electronic structure of Sr2IrO4 has been well studied and understood in terms of an effective Jeff = 1/2 Mott insulator model. However, little work has been done in studying its high energy electronic behaviors. Here we report a new observation of the anomalous high energy electronic structure in Sr2IrO4. By taking high-resolution angle-resolved photoemission measurements on Sr2IrO4 over a wide energy range, we have revealed for the first time that the high energy electronic structures show unusual nearly-vertical bands that extend over a large energy range. Such anomalous high energy behaviors resemble the high energy waterfall features observed in the cuprate superconductors. While strong electron correlation plays an important role in producing high energy waterfall features in the cuprate superconductors, the revelation of the high energy anomalies in Sr2IrO4, which exhibits strong spin-orbit coupling and a moderate electron correlation, points to an unknown and novel route in generating exotic electronic excitations.