Professor Gabriel Kotliar

Rutgers University

Correlation Effects in Iron Pnictides and Chalcogenides

Abstract:

The recently discovered iron based superconductors pose a new challenge to many body theory methods. We will argue that these materials are Hunds metals, a new class of strongly correlated materials where the correlations are controlled by the strength of the Hunds rule coupling J rather than by the Hubbard U. While correlations in these materials ar strong, their physical properties are strikingly different from that of transition metal oxides. We will describe some of the LDA+DMFT based predictions for various spectroscopies: optical conductivity, photoemission and inelastic neutron scattering. We will compare the theoretical results with experiments.