Fermi Surface of Sr$_{2}$RuO$_{4}$: Spin-Orbit and Anisotropic Coulomb Interaction Effects

Zhang, G.; Sarvestani, E.; Gorelov, E.; Pavarini, Eva

doi:10.1103/PhysRevLett.116.106402

Journal Article

FZJ-2016-07380

Fermi Surface of Sr$_{2}$RuO$_{4}$: Spin-Orbit and Anisotropic Coulomb Interaction Effects

Zhang, G.FZJ* ; Gorelov, E. ; Sarvestani, E.FZJ* ; Pavarini, E. (Corresponding author)FZJ*

2016
APS College Park, Md.

Physical review letters 116, 106402 (2016) [10.1103/PhysRevLett.116.106402]

This record in other databases:

Please use a persistent id in citations: http://hdl.handle.net/2128/13172 doi:10.1103/PhysRevLett.116.106402

Abstract: The topology of the Fermi surface of Sr2RuO4 is well described by local-density approximation calculations with spin-orbit interaction, but the relative size of its different sheets is not. By accounting for many-body effects via dynamical mean-field theory, we show that the standard isotropic Coulomb interaction alone worsens or does not correct this discrepancy. In order to reproduce experiments, it is essential to account for the Coulomb anisotropy. The latter is small but has strong effects; it competes with the Coulomb-enhanced spin-orbit coupling and the isotropic Coulomb term in determining the Fermi surface shape. Its effects are likely sizable in other correlated multiorbital systems. In addition, we find that the low-energy self-energy matrix—responsible for the reshaping of the Fermi surface—sizably differs from the static Hartree-Fock limit. Finally, we find a strong spin-orbital entanglement; this supports the view that the conventional description of Cooper pairs via factorized spin and orbital part might not apply to Sr2RuO4.

Classification: