High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies

A. Tamai, M. Zingl, Emil Jerzy Rozbicki, E. Cappelli, S. Riccò, A. de la Torre, S. McKeown-Walker, F. Y. Bruno, Philip David King, W. Meevasana, M. Shi, M. Radović, N. C. Plumb, Alexandra Sarah Gibbs, Andrew Peter Mackenzie, C. Berthod, H. U. R. Strand, M. Kim, A. Georges, F. Baumberger

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Abstract

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 2, due to electronic correlations. The self-energies for the β and γ 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 nonlinear frequency dependence of the self-energies, leading to “kinks” in the quasiparticle dispersion of Sr2RuO4.
Original languageEnglish
Article number021048
Number of pages18
JournalPhysical Review X
Volume9
Issue number2
Early online date6 Jun 2019
DOIs
Publication statusPublished - Jun 2019

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