Field-induced delocalization and Zener breakdown in semiconductor superlattices

We investigate the electronic structure in strongly coupled superlattices over a wide field range. It is shown that the Wannier–Stark localization is followed by a field-induced delocalization which is due to a strong Zener coupling to continuum states. The associated Zener breakdown is quantitative...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1999-12, Vol.272 (1), p.180-182
Main Authors: Rosam, B, Löser, F, Lyssenko, V.G, Leo, K, Glutsch, S, Bechstedt, F, Köhler, K
Format: Article
Language:English
Subjects:
Electrical breakdown
Superlattice
Zener
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Summary:We investigate the electronic structure in strongly coupled superlattices over a wide field range. It is shown that the Wannier–Stark localization is followed by a field-induced delocalization which is due to a strong Zener coupling to continuum states. The associated Zener breakdown is quantitatively shown in a detailed analysis of the absorption. A comprehensive theoretical model excellently describes the experimental results. Zener tunneling times are directly addressed with the help of time-resolved experiments.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(99)00266-5