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We present detailed LDA'+DMFT investigation of doping dependence ofcorrelation effects in novel K{1-x}Fe{2-y}Se2 superconductor. Calculations wereperformed at four different hole doping levels, starting from hypotheticalstoichiometric composition with total number of electrons equal to 29 per unitcell through 28 and 27.2 electrons towards the case of 26.52, which correspondsto chemical composition K{0.76}Fe{1.72}Se2 studied in recent ARPES experiments.In general case the increase of hole doping leads to quasiparticle bands inwide energy window +/-2 eV around the Fermi level becoming more broadened bylifetime effects, while correlation induced compression of Fe-3d LDA'bandwidths stays almost the same and of the order of ~1.3 for all holeconcentrations. However close to the Fermi level situation is more complicated.Here in the energy interval from -1.0 eV to 0.4 eV the bare Fe-3d LDA' bandsare compressed by significantly larger renormalization factors up to 5 withhole doping increase, while the value of Coulomb interaction remains the same.This fact manifests the increase of correlation effects with hole doping inK{1-x}Fe{2-y}Se2 system. Moreover in contrast to typical pnictidesK{1-x}Fe{2-y}Se2 does not have well defined quasiparticle bands on the Fermileves but pseudogap like "dark" region instead. We also find that with thegrowth of hole doping Fe-3d orbitals of various symmetries are affected bycorrelations in a different way in different parts of Brillouin zone. Toillustrate this we determine quasiparticle mass renormalization factors andenergy shifts, which transform the bare Fe-3d LDA' bands of various symmetriesinto LDA'+DMFT quasiparticle bands. These renormalization factors effectivelymimic more complicated energy dependent self-energy effects and can be used toanalyze the available ARPES data.

Doping Dependence of Correlation Effects in K{1-x}Fe{2-y}Se2 Superconductor: LDA'+DMFT Investigation