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Field-induced delocalization and zener breakdown in semiconductor superlattices

Feldinduzierte Delokalisierung und Zenerdurchbruch in Halbleitergittern
: Rosam, B.; Meinhold, D.; Löser, F.; Lyssenko, V.; Leo, K.; Glutsch, S.; Bechstedt, F.; Köhler, K.


Physica status solidi. B 221 (2000), pp.463-466
ISSN: 0031-8957
ISSN: 0370-1972
Journal Article
Fraunhofer IAF ()
III-V semiconductor; III-V Halbleiter; superlattice; Übergitter; optical measurement; optische Messung

We investigate the electronic structure in strongly coupled superlattices over a wide field range. It is shown that die Wannier-Stark localization is followed by a field-induced delocalization which is due to a strong Zener coupling to continuum states, We compare different superlattice structures with high and with low barriers to alternatively investigate the affects of. resonant interminiband tunneling and a strong Zener coupling to continuum states. The associated electrical 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 by time-resolved experiments.