High-energy pseudogap in degenerate Hubbard model induced via Hund coupling

@inproceedings{Liebsch2011HighenergyPI,
  title={High-energy pseudogap in degenerate Hubbard model induced via Hund coupling},
  author={Ansgar Liebsch},
  year={2011}
}
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… Expand

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