Figure 1
(a) One-particle spectral function A(k, ω) for nc = 0.3 and jK/t = 0.3 as a function of ω for fixed values of k = k(ex + ey) in a small wave-vector region around kF. The k-resolved Kondo resonance peak around ω = 0 is clearly seen for all k values. (b) A(k, ω) for the raised temperature kBT = 5 · 10−3 t, which is above the Kondo temperature TK. For fixed k around kF only the coherent excitations survive whereas the Kondo resonances disappear. Note that the discrete bright spots for the coherent excitations are characteristic for finite systems which is not the case for the Kondo resonance.
