High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies
| Autor: | A. Tamai, M. Zingl, E. Rozbicki, E. Cappelli, S. Riccò, A. de la Torre, S. McKeown Walker, F. Y. Bruno, P. D. C. King, W. Meevasana, M. Shi, M. Radović, N. C. Plumb, A. S. Gibbs, A. P. Mackenzie, C. Berthod, H. U. R. Strand, M. Kim, A. Georges, F. Baumberger |
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| Přispěvatelé: | University of St Andrews. Centre for Designer Quantum Materials, University of St Andrews. School of Physics and Astronomy, University of St Andrews. Condensed Matter Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Strongly correlated materials
Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Physics QC1-999 TK Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences DAS ddc:500.2 Condensed matter physics TK Electrical engineering. Electronics Nuclear engineering Condensed Matter - Strongly Correlated Electrons QC Physics Condensed Matter::Strongly Correlated Electrons QC |
| Zdroj: | Physical Review X, Vol. 9, No 021048 (2019) pp. 1-18 Physical Review X, Vol 9, Iss 2, p 021048 (2019) |
| ISSN: | 2160-3308 |
| Popis: | We explore the interplay of electron-electron correlations and spin-orbit coupling in the model Fermi liquid Sr2RuO4 using laser-based angle-resolved photoemission spectroscopy. Our precise measurement of the Fermi surface confirms the importance of spin-orbit coupling in this material and reveals that its effective value is enhanced by a factor of about two, due to electronic correlations. The self-energies for the $\beta$ and $\gamma$ sheets are found to display significant angular dependence. By taking into account the multi-orbital composition of quasiparticle states, we determine self-energies associated with each orbital component directly from the experimental data. This analysis demonstrates that the perceived angular dependence does not imply momentum-dependent many-body effects, but arises from a substantial orbital mixing induced by spin-orbit coupling. A comparison to single-site dynamical mean-field theory further supports the notion of dominantly local orbital self-energies, and provides strong evidence for an electronic origin of the observed non-linear frequency dependence of the self-energies, leading to `kinks' in the quasiparticle dispersion of Sr2RuO4. Comment: PRX accepted |
| Databáze: | OpenAIRE |
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