Abstract
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.
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