Josephson Current through a Quantum Dot Connected with Superconducting Leads

Figure 5

Current density and dependence of the pole position on the QD energy level. The data are obtained by the HF approximation for   0.1 and θ  . (a) Current density. The solid and dashed curves correspond to cases U = 3 with and , respectively. (b) Dependence of the pole positions of on the QD energy level. The solid curves with symbols , , and correspond to cases U = 0, 3, and 5, respectively.

(a)

(b)