Fermi surface topology of LaFePO and LiFeP
  We perform charge self-consistent LDA+DMFT (density functional theory combined with dynamical mean field theory) calculations to study correlation effects on the Fermi surfaces of the iron pnictide superconductors LaFePO and LiFeP. We find a distinctive change in the topology of the Fermi surface in both compounds where a hole pocket with Fe dz^2 orbital character changes its geometry from a closed shape in LDA to an open shape upon inclusion of correlations. 
Johannes Ferber, Harald O. Jeschke, Roser Valenti
cond-mat.str-el cond-mat.supr-con