Observation of Wannier-Stark localization in shallow superlattices
- 3 September 1992
- proceedings article
- Published by SPIE-Intl Soc Optical Eng
- p. 310-318
- https://doi.org/10.1117/12.137621
Abstract
Surprisingly, the onset of superlattice (SL)-type electroabsorption (EA) (localization/delocalization and Stark ladder phenomena) as multi-quantum well (MQW) barriers are lowered does not correlate with miniband width. As the barriers of a 100/100 angstroms GaAs/AlxGa-1As MQW are lowered to x equals 0.01, similar (quantum confined Stark effect) EA as for x equals 0.3 samples is seen. For x equals 0.02, as the MQW period (d) is shortened to 140 angstroms, SL-type EA is observed but does not correlate with miniband width. This shows that standard models do not apply for shallow systems. For x equals 0.07 and d equals 175 angstroms SL effects consistent with standard models are observed.Keywords
This publication has 0 references indexed in Scilit: