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Article overview
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High-energy pseudogap in degenerate Hubbard model induced via Hund coupling | Ansgar Liebsch
; | Date: |
1 Sep 2011 | 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. | Source: | arXiv, 1109.0162 | Services: | Forum | Review | PDF | Favorites |
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