title: Kondo resonance for orbitally degenerate systems.
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.
authors.affiliation: Institute of Metal Physics, 620219 Ekaterinburg, Russia.
authors.forename: A K
authors.initials: AK
authors.lastname: Zhuravlev
authors.forename: V Yu
authors.initials: VY
authors.lastname: Irkhin
authors.forename: M I
authors.initials: MI
authors.lastname: Katsnelson
authors.forename: A I
authors.initials: AI
authors.lastname: Lichtenstein