TY  - JOUR
AU  - Zhang, G.
AU  - Gorelov, E.
AU  - Sarvestani, E.
AU  - Pavarini, Eva
TI  - Fermi Surface of Sr$_{2}$RuO$_{4}$: Spin-Orbit and Anisotropic Coulomb Interaction Effects
JO  - Physical review letters
VL  - 116
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2016-07380
SP  - 106402
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000371721600009
C6  - pmid:27015496
DO  - DOI:10.1103/PhysRevLett.116.106402
UR  - https://juser.fz-juelich.de/record/824878
ER  -