Smooth Positons of the Second-Type Derivative Nonlinear Schrödinger Equation

Shu-Zhi Liu,Yong-Shuai Zhang,Jing-Song He

Fig. 2 (Color online) The evolution of the third order positon solution $q_{3p}$ of the DNLSII equation with $\xi_{1}=1.1,\eta_{1}=0.9$. (a) The structure of third order positon solution. (b) The density profile. (c) The comparsion between the real trajectories and approximate orbits for third order positon solution. Four blue dot lines denote the extreme values (including two minimal lines); Two dashes lines (green and red) denote the approximate orbits; The middle black dash-dot line denotes trajectory without phase shift.