Kondo resonance for orbitally degenerate systems |
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Authors: | Zhuravlev A K Irkhin V Yu Katsnelson M I Lichtenstein A I |
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Institution: | Institute of Metal Physics, 620219 Ekaterinburg, Russia. |
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Abstract: | Formation of the Kondo state in the general two-band Anderson model has been investigated within the numerical renormalization group calculations. The Abrikosov-Suhl resonance is essentially asymmetric for the model with one electron per impurity (quarter filling case) in contrast with the one-band case. An external magnetic (pseudomagnetic) field breaking spin (orbital) degeneracy leads to asymmetric splitting and essential broadening of the many-body resonance. Unlike the standard Anderson model, the "spin-up" Kondo peak is pinned against the Fermi level, but not suppressed by the magnetic field. |
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