Self-energy analysis of multiple-bosonic mode coupling in Sr2RuO4

Kim, Chul; Kyung, Wonshik; Park, S.R.; Leem, Choon Seong; Song, Dong Joon; Kim, Y.K.; Choi, Soo Hyun; Jung, Wooyong; Koh, Youngwoo; Choi, Hyunyong; Yoshida, Yoshiyuki; Moore, Robert; Shen, Z.‐X.; Kim, C.

doi:10.1016/j.jpcs.2010.10.068

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…These deviations are reproduced by our DMFT calculations suggesting that the cause of these non-linearities are local electronic correlations. Our results thus call for a revision of earlier reports of strong electron-lattice coupling in Sr 2 RuO 4 [29][30][31][46][47][48][49][50]. We finally quantify the effective spin-orbit coupling (SOC) strength and confirm its enhancement due to correlations predicted theoretically [21,23,51].…”

Section: Introductionsupporting

confidence: 81%

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

et al. 2019

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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 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 non-linear frequency dependence of the self-energies, leading to 'kinks' in the quasiparticle dispersion of Sr2RuO4. * present address: ISIS Facility, Rutherford

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Section: Introductionsupporting

confidence: 81%

“…This band assignment is used by the vast majority of subsequent ARPES publications [29-31, 33, 46, 56, 88, 89], except for Ref. [47], which reports a dispersion with much lower Fermi velocity and a strong kink at 15 meV for the smaller β sheet that we identify as a surface band.…”

Section: Acknowledgmentsmentioning

confidence: 95%

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

et al. 2019

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show abstract

“…These deviations are reproduced by our DMFT calculations, suggesting that the cause of these nonlinearities are local electronic correlations. Our results thus call for a revision of earlier reports of strong electron-lattice coupling in Sr 2 RuO 4 [29][30][31][46][47][48][49][50]. We finally quantify the effective spin-orbit coupling (SOC) strength and confirm its enhancement due to correlations predicted theoretically [21,23,51].…”

Section: Introductionsupporting

confidence: 80%

“…This band assignment is used by the vast majority of subsequent ARPES publications [29][30][31]33,46,56,89,90], except for Ref. [47], which reports a dispersion with much lower Fermi velocity and a strong kink at 15 meV for the smaller β sheet that we identify as a surface band.…”

Section: Acknowledgmentsmentioning

confidence: 97%

A Laser-Sharp View of Electron Correlations

Zhang

2019

Physics

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We explore the interplay of electron-electron correlations and spin-orbit coupling in the model Fermi liquid Sr 2 RuO 4 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 Sr 2 RuO 4 .

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“…Angle-resolved photoemission spectroscopy (ARPES) data have revealed kinks at energies of 40meV, 50-60meV and 70-80meV in the dispersion of quasi-2D γ band 4,13,21 . While there have been some discussions of self energy effects for the α band 21 , no sharp features have been unambiguously identified on the quasi-1D bands 13,21,23 .…”

mentioning

confidence: 99%

Quasiparticle interference and strong electron–mode coupling in the quasi-one-dimensional bands of Sr2RuO4

et al. 2017

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These authors contributed equally to this work 2The single-layered ruthenate Sr2RuO4 has attracted a great deal of interest as a spin-triplet superconductor with an order parameter that may potentially break time reversal invariance and host half-quantized vortices with Majorana zero modes. While the actual nature of the superconducting state is still a matter of controversy, it has long been believed that it condenses from a metallic state that is well described by a conventional Fermi liquid. In this work we use a combination of Fourier transform scanning tunneling spectroscopy (FT-STS) and momentum resolved electron energy loss spectroscopy (M-EELS) to probe interaction effects in the normal state of Sr2RuO4. Our high-resolution FT-STS data show signatures of the β-band with a distinctly quasi-one-dimensional (1D) character. The band dispersion reveals surprisingly strong interaction effects that dramatically renormalize the Fermi velocity, suggesting that the normal state of Sr2RuO4 is that of a `correlated metal' where correlations are strengthened by the quasi 1D nature of the bands. In addition, kinks at energies of approximately 10meV, 38meV and 70meV are observed. By comparing STM and M-EELS data we show that the two higher energy features arise from coupling with collective modes. The strong correlation effects and the kinks in the quasi 1D bands may provide important information for understanding the superconducting state. This work opens up a unique approach to revealing the superconducting order parameter in this compound.

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Self-energy analysis of multiple-bosonic mode coupling in Sr2RuO4

Cited by 11 publications

References 19 publications

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

A Laser-Sharp View of Electron Correlations

Quasiparticle interference and strong electron–mode coupling in the quasi-one-dimensional bands of Sr2RuO4

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