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Non-local electronic correlation effects in materials

Alexander Lichtenstein, University Hamburg

06.05.2016 at 09:00 

Dynamical mean field theory (DMFT) in combination with the first-principle LDA-scheme is an optimal starting point to go beyond static density functional approximation and include effects of spin and charge fluctuations in strongly correlated materials. In order to go beyond the local approximation we investigate a cluster generalization of the DMFT scheme as well as analytical dual-fermion/boson scheme which include a full interaction vertex of general impurity problem and spin fluctuations in the ladder approximation. We discuss non-local correlation effects in superconducting and magnetic materials which have anomalies in the energy spectrum.

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