TY  - JOUR
AU  - Liebsch, A.
TI  - High-energy pseudogap induced by Hund coupling in a degenerate Hubbard model
JO  - Physical review / B
VL  - 84
IS  - 18
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-18489
SP  - 180505
PY  - 2011
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000296911600002
DO  - DOI:10.1103/PhysRevB.84.180505
UR  - https://juser.fz-juelich.de/record/18489
ER  -