High-energy pseudogap in degenerate Hubbard model induced via Hund coupling
Strongly Correlated Electrons
2015-05-30 v1
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.
Keywords
Cite
@article{arxiv.1109.0162,
title = {High-energy pseudogap in degenerate Hubbard model induced via Hund coupling},
author = {Ansgar Liebsch},
journal= {arXiv preprint arXiv:1109.0162},
year = {2015}
}
Comments
4 pages, 4 figures