Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment

Abstract

The spin-orbit Mott insulator Sr${}_2$IrO${}_4$ has attracted a lot of interest in recent years from theory and experiment due to its close connection to isostructural high-temperature copper oxide superconductors. Despite of not being superconducting its spectral features closely resemble those of the cuprates, including Fermi surface and pseudogap properties. In this article, we review and extend recent work in the theoretical description of the spectral function of pure and electron-doped Sr${}_2$IrO${}_4$ based on a cluster extension of dynamical mean-field theory ("oriented-cluster DMFT") and compare it to available angle-resolved photoemission data. Current theories provide surprisingly good agreement for pure and electron-doped Sr${}_2$IrO${}_4$, both in the paramagnetic and antiferromagnetic phases. Most notably, one obtains simple explanations for the experimentally observed steep feature around the $M$ point and the pseudo-gap-like spectral feature in electron-doped Sr${}_2$IrO${}_4$.

29 pages, 17 figures

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Cited by in corpus (12)

• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• BaOsO${}_3$: A Hund's metal in the presence of strong spin-orbit coupling
• Light-induced insulator-metal transition in Sr${}_2$IrO${}_4$ reveals the nature of the insulating ground state
• Decomposing imaginary time Feynman diagrams using separable basis functions: Anderson impurity model strong coupling expansion
• Non-local Correlation Effects in Fermionic Many-Body Systems: Overcoming the Non-causality Problem
• Modeling multiorbital effects in Sr2IrO4 under strain and a Zeeman field
• The rich phase diagram of the prototypical iridate Ba${}_2$IrO${}_4$: Effective low-energy models and metal-insulator transition
• Microscopic model realization of $\mathbf{d}$-wave pseudospin current order in Sr${}_2$IrO${}_4$
• Magnetic polarons due to spin-length fluctuations in ${\mathbf{d}}^4$ spin-orbit Mott systems
• Formation of CuO${}_2$ sublattices by suppression of interlattice correlations in tetragonal CuO
• Automated evaluation of imaginary time strong coupling diagrams by sum-of-exponentials hybridization fitting
• Fingerprints of Mott and Slater gaps in the core-level photoemission spectra of antiferromagnetic iridates