Quasi-localization and quasi-mobility edge for light atoms mixed with heavy ones

Details Quasi-localization and quasi-mobility edge for light atoms mixed with heavy ones Quasi-localization and quasi-mobility edge for light atoms mixed with heavy ones

2007-06-05

arxiv.org/abs/0706.0629v5

Physics

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

Scientific paper

10.1140/epjb/e2008-00045-9

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.

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