Fermi Surface ofSr2RuO4: Spin-Orbit and Anisotropic Coulomb Interaction Effects
Autor: | Evgeny Gorelov, Esmaeel Sarvestani, Guoren Zhang, Eva Pavarini |
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Rok vydání: | 2016 |
Předmět: |
Physics
Condensed matter physics Isotropy General Physics and Astronomy Fermi surface 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Quantum mechanics 0103 physical sciences Coulomb Condensed Matter::Strongly Correlated Electrons Cooper pair 010306 general physics 0210 nano-technology Anisotropy Fermi Gamma-ray Space Telescope Spin-½ |
Zdroj: | Physical Review Letters. 116 |
ISSN: | 1079-7114 0031-9007 |
DOI: | 10.1103/physrevlett.116.106402 |
Popis: | The topology of the Fermi surface of Sr_{2}RuO_{4} 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 Sr_{2}RuO_{4}. |
Databáze: | OpenAIRE |
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