Le Journal de Physique IV 03 (1993) C5-445-C5-448
Observation of type-I and type-II Wannier-stark-effect in InGaAs/InGaAs superlatticesR. SCHWEDLER, F. BRÜGGEMANN, B. OPITZ, A. KOHL, K. WOLTER, K. LEO and H. KURZ
Institut für Halbleitertechnik, RWTH Aachen, Sommerfeldstrasse 24, 52074 Aachen, Germany
The formation of minibands is demonstrated in photocurrent experiments on shallow In0.53Ga0.47As/In0.40Ga0.60As superlattices grown by low pressure metal-organic vapor phase epitaxy. Field-dependent variations of the spectral shape are attributed to Wannier-Stark-localization. Both type-I transitions between electrons and heavy holes and type-II transitions involving light holes confined in the In0.40Ga0.60As layers are observed and identified by comparison with theoretical calculations of the superlattice electronic transitions.
© EDP Sciences 1993