Abstract
In the present paper, soliton-impurity interactions in a weak ac drive are semianalytically and fully numerically studied. It is found that a soliton with initial velocity =0 in a weak ac drive can overcome an attractive impurity potential. A physical interpretation of this phenomenon is given: First, the impurity mode is excited and amplified by the weak ac drive, then the soliton gains, through the strong soliton-impurity interactions, kinetic energy to overcome the impurity potential and finally escapes.
- Received 24 January 1992
DOI:https://doi.org/10.1103/PhysRevB.47.1088
©1993 American Physical Society