Hybridizing localized and itinerant electrons: a recipe for pseudogaps
arXiv:1311.3341 · doi:10.1103/PhysRevB.89.085127
Abstract
In a system where selective Mott localization is realized, some electrons show a gap to charge excitations while others do not. A hybridization between these two kind of electrons will lead to a smoothening of this sharp difference and can even bring the system back to a complete delocalization. We show here that there is a large region of parameters at finite hybridization where the selective localization persists and the system shows a partial filling of the selective gap with incoherent states, giving rise to a pseudogap. This result is illustrated here in a two orbital Hubbard model with Hund's coupling, but is based on quite general assumptions and should hold for a larger class of systems, and possibly be a paradigm for the pseudogap mechanism in cuprates.
11 pages, 9 figures
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- Analytical slave-spin mean-field approach to orbital selective Mott insulators
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