Interference patterns between bright–dark two solitons. Top panel: density evolutions for soliton collisions, panels (a) and (b) correspond to the component q_2b and component q_2d, respectively. Bottom panel: spatial interference fringes (blue solid curve) and temporal interference fringes (red dotted curve); They are the cutaway view of the interference patterns in Figs. 1(a) and 1(b) at t = 0 and x = 1.05, respectively. Panels (a1) and (a2) correspond to the component q_2b; panels (b1) and (b2) correspond to the component q_2d. It is shown that the spatial-temporal interference patterns are formed in both components. For dark solitons, interference behavior was absent in the previous studies. The parameters are v₁ = −2.4, v₂ = 1.1, w₁ = 0.324, w₂ = 0.224, φ₁ = 0, and φ₂ = 0.