Smooth Positons of the Second-Type Derivative Nonlinear Schrödinger Equation

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

Fig. 1 (Color online) The evolution of the fundamental positon $|q_{2p}|$ of the DNLSII equation with $\xi_{1}=1.3,\eta_{1}=0.7$. (a) The structure of fundamental positon solution. (b) The density profile. (c) The comparsion between the real trajectories of positon and the approximate orbits: The three blue dot lines denote the extreme values of positon solution (including a minimal line); Two dash lines (green and red) denote the approximate orbits.