Unidimensional model of the ad-atom diffusion on a substrate submitted to a standing acoustic wave II. Solutions of the ad-atom motion equation

Nicolas Combe (1) , Christophe Taillan (1) , Joseph Morillo (1)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales

The ad-atom dynamic equation, a Langevin type equation is analyzed and solved using some non-linear analytical and numerical tools. We noticeably show that the effect of the surface acoustic wave is to induce an effective potential that governs the diffusion of the ad-atom: the minima of this effective potential correspond to the preferential sites in which the ad-atom spends more time. The strength of this effective potential is compared to the destructuring role of the thermal diffusion and to the crystalline potential induced by the substrate.

Domaines: Vibrations [physics.class-ph]; Vibrations [physics.class-ph]

Nicolas Combe, Christophe Taillan, Joseph Morillo. Unidimensional model of the ad-atom diffusion on a substrate submitted to a standing acoustic wave II. Solutions of the ad-atom motion equation. 2011. ⟨hal-00678538⟩