FLEX-description of the spectral functions near singlet-triplet transition

Details FLEX-description of the spectral functions near singlet-triplet transition FLEX-description of the spectral functions near singlet-triplet transition

2010-06-22

arxiv.org/abs/1006.4287v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

In a previous article, we have investigated the non-equilibrium two-level Anderson model with a simple iterative perturbation theory. Here we use here a more sophisticated perturbative method, the fluctuation-exchange (FLEX) approximation. The great advantage of FLEX is its \textit{conserving} nature, and that it can describe well the Kondo energy scale, the Kondo-temperature, $T_{K}$. As it was expected from the results obtained with iterative perturbation theory, the FLEX description can give back also the relevant features of the spectral properties.

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