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Anomalous High-Energy Waterfall-Like Electronic Structure in 5 d Transition Metal Oxide Sr2IrO4 with a Strong Spin-Orbit Coupling

机译:具有强自旋轨道耦合的5 d过渡金属氧化物Sr2IrO4中的异常高能瀑布类电子结构

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摘要

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.
机译:Sr2IrO4的低能电子结构已经通过有效的Jeff = 1/2 Mott绝缘子模型进行了充分的研究和理解。但是,在研究其高能电子行为方面,几乎没有做任何工作。在这里,我们报告了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进行高分辨率的角度分辨光发射测量,我们首次揭示了高能量电子结构显示了在较大能量范围内延伸的异常垂直带。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。尽管强电子相关性在形成铜酸盐超导体中的高能瀑布特征中起着重要作用,但Sr2IrO4中高能异常的揭示却显示出强自旋轨道耦合和适度的电子相关性,这指出了未知的新颖途径。产生奇特的电子激励。

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