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@ARTICLE{Zhang:885420,
      author       = {Zhang, Guoren and Pavarini, Eva},
      title        = {{O}ptical conductivity, {F}ermi surface, and spin-orbit
                      coupling effects in {S}r 2 {R}h{O} 4},
      journal      = {Physical review / B},
      volume       = {99},
      number       = {12},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2020-03817},
      pages        = {125102},
      year         = {2019},
      abstract     = {By using the local-density approximation + dynamical
                      mean-field theory approach, we study the low-energy
                      electronic properties of $Sr_2RhO_4$ in a realistic setting,
                      and compare to $Sr_2RuO_4$. We investigate the interplay of
                      spin-orbit coupling, crystal field, and Coulomb interaction,
                      including the tetragonal terms of the Coulomb tensor. We
                      find that (i) differently than in $Sr_2RuO_4$, the
                      zero-frequency effective crystal-field “enhancement” due
                      to Coulomb repulsion, ΔɛCF(ω=0), is small and, depending
                      on the parameters, even negative. (ii) In addition, the
                      effects of (realistic) anisotropic Coulomb terms are weak.
                      (iii) Instead, the effective zero-frequency enhancement of
                      the spin-orbit interaction doubles the value of the
                      corresponding local-density approximation couplings. This
                      explains the experimental Fermi surface and supports a
                      previous proposal based on static mean-field calculations.
                      We find that the sign of the Coulomb-induced spin-orbit
                      anisotropy is influenced by the octahedral rotation. Based
                      on these conclusions, we examine recent optical conductivity
                      experiments. (iv) We show that the spin-orbit interaction is
                      key for understanding them; differently than in $Sr_2RuO_4$,
                      the $t_{2g}$ intraorbital contributions are small; thus, the
                      single-band picture does not apply.},
      ddc          = {530},
      pnm          = {Multiplet effects in strongly correlated materials
                      $(jiff41_20091101)$ / Spin-orbital order-disorder
                      transitions in strongly correlated systems
                      $(jiff46_20161101)$},
      pid          = {$G:(DE-Juel1)jiff41_20091101$ /
                      $G:(DE-Juel1)jiff46_20161101$},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevB.99.125102},
      url          = {https://juser.fz-juelich.de/record/885420},
}