We have studied numerically the soliton scattering from one or two impurities in one-dimensional atomic lattices with nonlinear first-neighbor interactions of both quartic and Morse type. Our results for small-amplitude incident solitons are interpreted with some analytical formulas obtained from linear theories, while comparison with linear wave-packet results are made for both low- and high-amplitude incident solitons. Finally, interference effects are studied.

• Received 21 September 1987

DOI:https://doi.org/10.1103/PhysRevB.37.3534