High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies
High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies
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DOI：
10.1103/physrevx.9.021048
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发表时间：
2019-06-06
影响因子：
12.5
通讯作者：
Baumberger, F.
中科院分区：
文献类型：
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作者：
Tamai, A.;Zingl, M.;Baumberger, F.
我们探索的电子-电子相关性和自旋轨道耦合的相互作用，在模型费米液体Sr 2 RuO 4使用基于激光的角分辨光电子能谱。我们对费米表面的精确测量证实了这种材料中自旋-轨道耦合的重要性，并揭示了由于电子相关性，其有效值提高了约2倍。的β和Y片的自能被发现显示显着的角度依赖性。通过考虑准粒子态的多轨道组成，我们直接从实验数据中确定与每个轨道分量相关的自能。这一分析表明，所感知的角度依赖性并不意味着动量依赖的多体效应，但从大量的自旋轨道耦合引起的轨道混合。比较单网站动态平均场理论进一步支持的概念，占主导地位的本地轨道自能，并提供了强有力的证据为电子原产地所观察到的非线性频率依赖性的自能，导致“扭结”的准粒子分散的Sr 2 RuO 4。
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 beta and y 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.