Abstract
has often been described via a simple, one-band pseudospin- model subject to electron-electron interactions on a square lattice, fostering analogies with cuprate superconductors believed to be well described by a similar model. In this work we argue—based on a detailed study of the low-energy electronic structure by circularly polarized spin and angle-resolved photoemission spectroscopy combined with dynamical mean-field theory calculations—that a pseudospin- model fails to capture the full complexity of the system. We show instead that a realistic multiband Hubbard Hamiltonian, accounting for the full correlated manifold, provides a detailed description of the interplay between spin-orbital entanglement and electron-electron interactions and yields quantitative agreement with experiments. Our analysis establishes that the states make up a substantial percentage of the low-energy spectral weight, i.e., approximately 74% as determined from the integration of the -resolved spectral function in the 0 to energy range. The results in our work are of relevance not only to Ir-based materials but also more generally to multiorbital materials with closely spaced energy scales.
- Received 29 January 2022
- Revised 10 April 2022
- Accepted 19 May 2022
DOI:https://doi.org/10.1103/PhysRevB.105.245130
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