Figure 7

2d results. Rate of change of the disturbance defined in Eq. 7 as a function of the incident velocity k for different values of the interactions (g = 0 and g = 15) and of the parameter ε: separable stands for ε = 2 and the non-separable potential is with ε = 1. The initial wavefunction is \(\psi (x,y,t=\mathrm{0)}={\psi }_{0}{e}^{ik(x+y)/\sqrt{2}}\).