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Scattering-controlled transmission resonances and negative differential conductance by field-induced localization in superlattices.

The first observation of scattering-controlled transmission resonances in superlattices is reported. These originate from states supported by subsets of the superlattice of thickness equal to the electron coherence length. At lower electric fields a broad region of negative differential conductance due to progressive field-induced wave-function localization is also observed. This phenomenon is shown to be physically equivalent to the Bragg-diffraction-induced negative differential conductance predicted by Esaki and Tsu in 1970