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