Kondo Effect
Spin Screening Cloud · Resistivity Minimum · Many-Body Entanglement
Parameters
Kondo Temperature TK (K):
30
Exchange J (meV):
0.4
Bandwidth D (eV):
5
Phonon coeff A:
1.0
Impurity density nᵢ (%):
0.5
ρ(T) = ρ₀[1 − J·ln(T/TK)] + A·T² + B·T⁵ + C·nᵢ·f(T/TK)
Kondo temperature: TK ∝ D·exp(−1/J·N(EF))
Below TK: impurity screened into singlet;
ρ → constant (unitarity limit) as T→0
Kondo cloud radius ξK ∼ ℏvF/kBTK