Non-local Coulomb correlations in pure and electron-doped ${\mathrm{Sr}}_2{\mathrm{IrO}}_4$: spectral functions, Fermi surface and pseudogap-like spectral weight distributions from oriented cluster dynamical mean field theory

Abstract

We address the role of non-local Coulomb correlations and short-range magnetic fluctuations in the high-temperature phase of Sr${}_2$IrO${}_4$ within state-of-the-art spectroscopic and first-principles theoretical methods. Introducing a novel cluster dynamical mean field scheme, we compute momentum-resolved spectral functions, which we find to be in excellent agreement with angle-resolved photoemission spectra. We show that while short-range antiferromagnetic fluctuations are crucial to account for the electronic properties of the material even in the high-temperature paramagnetic phase, long-range magnetic order is not a necessary ingredient of the insulating state. Upon doping, an exotic metallic state is generated, exhibiting cuprate-like pseudo-gap spectral properties, for which we propose a surprisingly simple theoretical mechanism.

arXiv comment8 pages, 4 figures

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Cited by in corpus (12)

• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr2IrO4
• Spin-orbit coupling and correlations in three-orbital systems
• Magnetization density distribution of Sr${}_2$IrO${}_4$: Deviation from a local $j_{\text{eff}}=1/2$ picture
• Electronic structure and optical properties of Sr${}_2$IrO${}_4$ under epitaxial strain
• Light-induced insulator-metal transition in Sr${}_2$IrO${}_4$ reveals the nature of the insulating ground state
• Small moments without long-range magnetic ordering in the zero-temperature ground state of the double-perovskite iridate Ba${}_2$YIrO${}_6$
• Coherent and incoherent bands in La and Rh doped Sr3Ir2O7
• Possible superconductivity induced by a large spin-orbit coupling in carrier doped iridium oxide insulators: A weak coupling approach
• Evolution of the spectral lineshape at the magnetic transition in Sr2IrO4 and Sr3Ir2O7
• The rich phase diagram of the prototypical iridate Ba${}_2$IrO${}_4$: Effective low-energy models and metal-insulator transition
• Formation of CuO${}_2$ sublattices by suppression of interlattice correlations in tetragonal CuO