Motion of a Kink Pair in a Hydrogen-Bonded Chain Due to Anharmonicity

Abstract

In a hydrogen-bonded molecular chain with a symmetric double-well potential, using the variational approach, we study the kink pair with anharmonic interatomic interactions in the two sublattices, based on the two-component soliton model. We obtain the asymmetric solutions of a kink pair and calculate the energy, the effective mass and the charge density of a kink pair due to anharmonicity. The calculated results are in good agreement with the experimental data.