Effect of Hund's exchange on the spectral function of a triply orbital degenerate correlated metal

Details Effect of Hund's exchange on the spectral function of a triply orbital degenerate correlated metal Effect of Hund's exchange on the spectral function of a triply orbital degenerate correlated metal

2005-11-15

arxiv.org/abs/cond-mat/0511372v1

Phys. Rev. B 72, 245115 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Phys. Rev. B (In Press)

Scientific paper

10.1103/PhysRevB.72.245115

We present an approach based on the dynamical mean field theory which is able to give the excitation spectrum of a triply degenerate Hubbard model with a Hund's exchange invariant under spin rotation. The lattice problem can be mapped onto a local Anderson model containing 64 local eigenstates. This local problem is solved by a generalized non-crossing approximation. The influence of Hund's coupling J is examined in detail for metallic states close to the metal insulator transition. The band-filling is shown to play a crucial role concerning the effect of J on the low energy dynamics.

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