2 research outputs found
Locally Disordered Lattices in Strong ac Electric Fields
We develop a formalism to study the role of local defects in tight binding
systems in the presence of a strong external ac electric field. It is found
that the appearance and disappearance of localized states, as well as their
localization lengths, can be controlled by the amplitude or frequency of the
driving field. The theory is illustrated by numerical model calculations for
imperfect semiconductor superlattices in far--infrared laser fields.Comment: LaTeX, 26 pages (8 figures available on request), Preprint
UCSBTH-93-2