Figure 4
From: Perturbation theory of a superconducting 0 − π impurity quantum phase transition
Normal (−Im G/π, upper panel (a)) and anomalous (
, lower panel (b)) spectral density for U = 4Δ, Γ = 2Δ, Φ = π/2 and ε = −U/2 (half-filling) calculated using the dynamical corrections from the second-order of the perturbation expansion.
The heights of the arrows marking the Andreev bound states represent their residues.
