Abstract
AbstractWe develop a microscopic theory of electron transport in superlattices within the Wannier‐Stark approach by including the interaction among the energy levels pertaining to adjacent quantum wells. The main results are: (i) the interaction among the levels is responsible for a systematic increase of the level energy with respect to the bottom of the quantum well at increasing electric fields; (ii) the interaction is responsible for the onset of a new delocalization of the Wannier‐Stark states at the highest fields associated with the tunneling of electrons between adjacent quantum wells; (iii) with respect to the noninteracting case, at the highest fields the average carrier energy evidences a consistent increase which leads to a significant softening of the negative differential value of both the drift velocity and diffusivity. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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