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Kim, Bumjoon
원자제어 저차원 전자계 연구단
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Constraints on the two-dimensional pseudospin- 12 Mott insulator description of Sr2IrO4

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Title
Constraints on the two-dimensional pseudospin- 12 Mott insulator description of Sr2IrO4
Author(s)
Zwartsenberg, B.; Day, R.P.; Razzoli, E.; Michiardi, M.; Na, M.X.; Zhang, G.; Denlinger, J.D.; Vobornik, I.; Bigi, C.; Bumjoon Kim; Elfimov, I.S.; Pavarini, E.; Damascelli, A.
Publication Date
2022-06
Journal
Physical Review B, v.105, no.24
Publisher
American Physical Society
Abstract
Sr2IrO4 has often been described via a simple, one-band pseudospin-12 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-12 model fails to capture the full complexity of the system. We show instead that a realistic multiband Hubbard Hamiltonian, accounting for the full correlated t2g 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 j3/2 states make up a substantial percentage of the low-energy spectral weight, i.e., approximately 74% as determined from the integration of the j-resolved spectral function in the 0 to -1.64eV 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. © 2022 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/12915
DOI
10.1103/PhysRevB.105.245130
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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