%0 Journal Article
%A Liebsch, A.
%T High-energy pseudogap induced by Hund coupling in a degenerate Hubbard model
%J Physical review / B
%V 84
%N 18
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-18489
%P 180505
%D 2011
%Z Record converted from VDB: 12.11.2012
%X Hund coupling in the degenerate five-band Hubbard model near n = 6 occupancy is shown to give rise to a significant depletion of spectral weight above the Fermi level. Calculations within dynamical mean-field theory combined with exact diagonalization reveal that this pseudogap is associated with a collective mode in the self-energy caused by spin fluctuations. The pseudogap is remarkably stable over a wide range of Coulomb and exchange energies, but disappears for weak Hund coupling. The implications of this phenomenon for optical spectra of iron pnictides are discussed.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000296911600002
%R 10.1103/PhysRevB.84.180505
%U https://juser.fz-juelich.de/record/18489