Josephson Current through a Quantum Dot Connected with Superconducting Leads

Figure 4

Dependence of the averaged occupation number in the QD on the QD energy level for   0.1 and θ  . The solid, dashed, and dotted curves correspond to cases U  5, 8, and 10, respectively. (a) HF approximation. (b) Lacroix approximation.

(a)

(b)