A mixture of light and heavy atoms is considered. We study the kinetics of the light atoms, scattered by the heavy ones, the latter undergoing slow diffusive motion. In three-dimensional space we claim the existence of a crossover region (in energy), which separates the states of the light atoms with fast diffusion and the states with slow diffusion; the latter is determined by the dephasing time. For the two dimensional case we have a transition between weak localization, observed when the dephasing length is less than the localization length (calculated for static scatterers), and strong localization observed in the opposite case.
European Physical Journal B
- Pub Date:
- January 2008
- Localization effects;
- Condensed Matter - Disordered Systems and Neural Networks
- LaTeX, 5 pages, 3 figures. The manuscript has been changed following the Referees' constructive criticism and is accepted for publication in EPJB