Computer experiment on propagation of solitons in crystals

Molecular dynamics computer simulation was carried out for homogeneous one-dimensional crystals and Langmuir–Blogett chain crystals. A mass-spring model was used, and the anharmonic interatomic potential up to the fourth order was taken into account. The total number of atoms was 120, and an end of the crystal was free to move and the other end fixed. An input pulse was applied to a couple of free end atoms, and the displacements and kinetic energies of all atoms in the crystal were computed. Solitons and phonons were produced, propagated and reflected at the ends of the crystal. Long-period propagation of stable solitons was observed in homogeneous crystals and in one-layer LB chain crystals.