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

Article Article scientifique Article High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies eng 2019 author Tamai Anna 0000-0001-5239-6826 795188 author Zingl M. author Rozbicki E. author Cappelli Edoardo 884256 author Ricco Sara 827343 author De La Torre Alberto 793516 author Mckeown Walker Siobhan 793495 author Bruno Flavio Yair 819904 author King P.D.C. author Meevasana W. author Shi M. author Radovic M. author Plumb N.C. author Gibbs A.S. author Mackenzie A.P. author Berthod Christophe 0000-0002-0787-008X 133299 author Strand Hugo 867801 author Kim M. author Georges Antoine 714169 author Baumberger Felix 0000-0001-7104-7541 790217 Félix Baumberger 1-18 10.1103/PhysRevX.9.021048 2160-3308 https://link.aps.org/doi/10.1103/PhysRevX.9.021048 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. Condensed matter physics Strongly correlated materials Dewey 500.2 Swiss National Science Foundation 146995 CH Swiss National Science Foundation 165791 CH 33 Département de physique de la matière quantique 131 false 805 Groupe Baumberger 780 Groupe Giamarchi Physical Review X 9 021048 f3d9d673-f71c-4e6f-b930-10d6116a10cb Article (Published version) Public PRX9_021048Tamai.pdf 2371764 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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High-Resolution Photoemission on Sr₂RuO₄ Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies	Physical Review X			2019	794	404

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