Fermi Surface of Sr2RuO4: Spin-Orbit and Anisotropic Coulomb Interaction Effects

Guoren Zhang, Evgeny Gorelov, Esmaeel Sarvestani, and Eva Pavarini
Phys. Rev. Lett. 116, 106402 – Published 8 March 2016
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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.

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  • Received 15 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.106402

© 2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Techniques
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Guoren Zhang1, Evgeny Gorelov1, Esmaeel Sarvestani1, and Eva Pavarini1,2

  • 1Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
  • 2JARA High-Performance Computing, RWTH Aachen University, 52062 Aachen, Germany

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Issue

Vol. 116, Iss. 10 — 11 March 2016

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