Soliton-kink interactions in a generalized nonlinear Schrodinger system

The interactions between the solitons and kinks in a nonintegrable system a re studied within the context of the generic cubic-quintic nonlinear Schrod inger equation, in which the bright soliton, dark soliton. kink and anti-ki nk solutions have been known. The structures have interesting relations wit h each other: they can coexist, and the kinks land anti-kinks) play a role of domain walls dividing the space into self-focusing and self-defocusing r egions. Numerical analysis shows that the bright (dark) solitons can be tra nsformed into the dark (bright) ones upon collisions with the kinks, direct ly showing the reciprocity between the two classes of solitons. (C) 2000 Pu blished by Elsevier Science B.V. All rights reserved.