Abstract
Molecular dynamics computer simulation has been performed in order to excite solitons in the two-dimensional mass-spring square-lattice model crystals. Central forces were considered between the nearest neighbor atoms in the crystal, and a lattice anharmonic potential up to the fourth order was taken into account. An input pulse displacement was given to the atomic rows in the crystal and the displacements of all the atoms were computed. When the applied input pulse was large, multiple solitons were produced. Collisions of the solitons with homogeneous and inhomogeneous rows of mass defects were simulated in order to investigate the characteristics of the defect-soliton interaction in the two-dimensional crystal. Collisions of solitons and phonons with a single mass defect were also simulated in order to investigate the differences in the characteristics of the two kinds of excitations.
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