High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies

We explore the interplay of electron-electron correlations and spin-orbit coupling in the model Fermi liquidSr2RuO4using 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 tha...

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Bibliographic Details
Published in:	Physical review. X 2019-06, Vol.9 (2)
Main Authors:	Tamai, A, Zingl, M, Rozbicki, E, Cappelli, E, Riccò, S, de la Torre, A, S. McKeown Walker, Bruno, F Y, King, P D C, Meevasana, W, Shi, M, Radović, M, Plumb, N C, Gibbs, A S, Mackenzie, A P, Berthod, C, Strand, H U R, Kim, M, Georges, A, Baumberger, F
Format:	Article
Language:	eng
Subjects:	Angular momentum Correlation Data analysis Electron spin Electron states Elementary excitations Fermi surfaces Laser applications Mean field theory Momentum Orbitals Photoelectric emission Spectrum analysis Spin-orbit interactions Strontium ruthenium oxide
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Summary:	We explore the interplay of electron-electron correlations and spin-orbit coupling in the model Fermi liquidSr2RuO4using 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 2, due to electronic correlations. The self-energies for theβandγsheets 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 nonlinear frequency dependence of the self-energies, leading to “kinks” in the quasiparticle dispersion ofSr2RuO4.
ISSN:	2160-3308 2160-3308