Anderson Impurity Model — Kondo Physics
Spectral function & NRG energy flow for a correlated quantum impurity
Model Parameters
Impurity level ε_d/Γ =
-2.0
Coulomb U/Γ =
4.0
Hybridization Γ =
1.0
Temperature T/T_K =
0.1
Display
Spectral A(ω)
NRG Flow
Occupancy
Physics
Occupancy ⟨n_d⟩
—
Kondo T_K/Γ
—
Kondo regime
—
H = ε_d n_d + U n_↑n_↓ + Σ_k(V c†_k d + h.c.)
Γ = π|V|²ρ_c (hybridization)
T_K ≈ √(ΓU/2) exp(πε_d(ε_d+U)/2ΓU)
Kondo peak at ω=0 for T≪T_K