Scattering of discrete solitons from an impurity in the saturable nonlinear Schrödinger equation.

We study the scattering of solitons from an impurity in the framework of the discrete nonlinear Schrödinger equation with a saturable nonlinearity. We show that this model displays a complex scenario compared to the same equation with cubic nonlinearity. For instance, even considering a single value of the soliton speed and frequency, one can generally observe the existence of a reflected and a transmitted soliton after the interaction between the incoming soliton and the impurity, and that in the case of an attractive impurity, a trapped soliton can coexist with the reflected and transmitted ones. [ABSTRACT FROM AUTHOR]