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A simple Kronig-Penney model is used to study the effect of nonlinearinteractions on the electronic properties of ordered and disordered electrifiedchains. In the case of ordered potentials, we found that the nonlinearitysuppresses the Wannier-Stark effect caused by the electric field. In the caseof disordered potentials, the nonlinearity gives rise to a transition fromsuperlocalized to weakly localized states.Comment: 8 pages (latex), 3 eps figures. Submitted to PR

Interplay between the electric field and the nonlinear interaction in ordered and disordered chains