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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 2011 The American Physical Society
- ISSN
- 1098-0121
- eISSN
- 1550-235X
- DOI
- 10.1103/PhysRevB.84.180505
- Publisher site
- See Article on Publisher Site
Abstract
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.
Journal
Physical Review B – American Physical Society (APS)
Published: Nov 1, 2011