Colloquium on April 23rd, 2007

Alexander Lichtenstein, University of Hamburg

Prospects of realistic ARPES theory for correlated systems

Density Functional Theory (DFT) and the GW-approximation have been highly successful for the interpretation of ARPES experiments for non-correlated systems. We discuss some failures of Local Density Approximation (LDA) to the DFT-scheme for transition metal and actinide compounds. One of the successful scheme for accurate description of the local Coulomb correlations in solids is based on Dynamical Mean Field Theory (DMFT) combined with first-principle investigations (LDA+DMFT). Possible ways to include non-local correlations in calculations of the spectral function in solids will be discussed.