Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.47: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Optical conductivity of layered ruthenates: spin-orbit and anistropic Coulomb interaction effects — •Esmaeel Sarvestani, Guoren Zhang, Evgeny Gorelov, and Eva Pavarini — Institute for Advanced Simulation, Forschungszentrum Jülich,D-52425 Jülich, Germany

Using the LDA+DMFT approach, we calculate the in-plane and out-of-plane optical conductivity of the single-layered (Sr₂RuO₄) and double-layered (Sr₃Ru₂O₇) ruthenates. The calculations are performed via linear response theory and Kubo’s formalism. We investigate the effects of the electron-electron interaction, the spin-orbit coupling and the low-symmetry Coulomb interaction in the optical spectra. We show that including the spin-orbit coupling improves the agreement with experimental data while the anisotropic Coulomb interaction does not change the in-plane optical spectrum. We find that, contrary to the out-of-plane conductivity, the in-plane conductivity changes considerably by changing temperature and Coulomb interaction and by including the spin-orbit coupling. We explain the difference in behaviour of the in-plane and out-of-plane conductivities in terms of the corresponding non-interacting transport functions. Furthermore, we discuss the effective mass-enhancement and quasi-particle scattering rate.