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首页> 外文期刊>Physical Review X >Correlation Effects and Hidden Spin-Orbit Entangled Electronic Order in Parent and Electron-Doped Iridates Sr 2 IrO 4
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Correlation Effects and Hidden Spin-Orbit Entangled Electronic Order in Parent and Electron-Doped Iridates Sr 2 IrO 4

机译：相关效果和隐藏的旋转轨道缠绕在父母和电子掺杂射击中的电子订单SR 2 IRO 4

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Analogs of the high- T c cuprates have been long sought after in transition metal oxides. Because of the strong spin-orbit coupling, the 5 d perovskite iridates Sr 2 IrO 4 exhibit a low-energy electronic structure remarkably similar to the cuprates. Whether a superconducting state exists as in the cuprates requires understanding the correlated spin-orbit entangled electronic states. Recent experiments discovered hidden order in the parent and electron-doped iridates, some with striking analogies to the cuprates, including Fermi surface pockets, Fermi arcs, and pseudogap. Here, we study the correlation and disorder effects in a five-orbital model derived from the band theory. We find that the experimental observations are consistent with a d -wave spin-orbit density wave order that breaks the symmetry of a joint twofold spin-orbital rotation followed by a lattice translation. There is a Berry phase and a plaquette spin flux due to spin procession as electrons hop between Ir atoms, akin to the intersite spin-orbit coupling in quantum spin Hall insulators. The associated staggered circulating J eff = 1 / 2 spin current can be probed by advanced techniques of spin-current detection in spintronics. This electronic order can emerge spontaneously from the intersite Coulomb interactions between the spatially extended iridium 5 d orbitals, turning the metallic state into an electron-doped quasi-2D Dirac semimetal with important implications on the possible superconducting state suggested by recent experiments.
机译：在过渡金属氧化物中追求高温铜酸盐的类似物。由于强旋转轨道耦合，5d Perovskite虹膜SR 2 IRO 4表现出低能量电子结构与铜酸盐相似。超导状态是否存在，如铜替代替代者所需要理解相关的旋转轨道缠绕的电子状态。最近的实验在父母和电子掺杂的虹膜中发现了隐藏的命令，其中一些具有尖锐的类比，包括Fermi表面口袋，费米弧和假焦点。在这里，我们研究了来自乐队理论的五轨道模型中的相关性和紊乱效应。我们发现实验观察与D -Wave旋转轨道密度波顺序一致，其断开双重旋转轨道旋转的对称性，然后是晶格翻译。由于IR原子之间的电子跳跃，存在浆果相和斑块自旋助焊剂，类似于IR原子之间的电子跳跃，类似于Quantum Spin Hall绝缘子中的旋转旋转轨道耦合。相关的交错循环J EFF = 1/2旋转电流可以通过旋转旋转电流检测中的先进技术来探讨。这种电子顺序可以从空间延伸的铱5d轨道之间的间隙库相互作用自发地出现，将金属状态转换为电子掺杂的准二极管半球形，其对最近实验表明的可能超导状态的重要意义。

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