Correlation Effects and Hidden Spin-Orbit Entangled Electronic Order in Parent and Electron-Doped Iridates Sr 2 IrO 4

Zhou, Sen; Jiang, Kun; Chen, Hua; Wang, Ziqiang

doi:10.1103/PhysRevX.7.041018

Title: Correlation Effects and Hidden Spin-Orbit Entangled Electronic Order in Parent and Electron-Doped Iridates ${Sr}_{2} {IrO}_{4}$

Journal Article · Tue Oct 24 00:00:00 EDT 2017 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.7.041018· OSTI ID:1402539

Zhou, Sen; Jiang, Kun; Chen, Hua; Wang, Ziqiang

Analogs of the high-T_c cuprates have been long sought after in transition metal oxides. Because of the strong spin-orbit coupling, the 5d perovskite iridates Sr₂IrO₄ 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. Here, this electronic order can emerge spontaneously from the intersite Coulomb interactions between the spatially extended iridium 5d 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.

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Research Organization:: Boston College, Chestnut Hill, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-99ER45747

OSTI ID:: 1402539

Alternate ID(s):: OSTI ID: 1499088

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 7 Journal Issue: 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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