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TT: Tiefe Temperaturen
TT 28: FV-internes Symposium ”Theoretical Modeling of Materials with Correlated Electrons”
TT 28.9: Fachvortrag
Thursday, March 11, 2004, 17:45–18:10, H20
Coulomb Correlations in Multi-Orbital Materials — •A. Liebsch — Forschungszentrum Juelich, D-52425 Juelich
The influence of local Coulomb interactions on the electronic properties of transition metal oxides is investigated within the Dynamical Mean Field Theory and multi-orbital Quantum Monte Carlo method. In materials such as VO2, SrVO3, and Sr2RuO4 the quasi-particle spectra exhibit correlation features which cannot be understood within density functional theory. In particular, we discuss the enhancement of correlation effects due to orbital polarization induced by Peierls distortion, the enhancement of correlations at surfaces due to band narrowing, and the possibility of observing multi-gapped Mott insulators.