Optical detection of high-field domains in GaAs/AlAs superlattices

Grahn, H. T.; Schneider, H.; Klitzing, K. v.
May 1989
Applied Physics Letters;5/1/1989, Vol. 54 Issue 18, p1757
Academic Journal
We investigated the formation of high-field domains in undoped GaAs/AlAs superlattices under strong illumination. The photocurrent-voltage characteristics showed an oscillatory-like behavior which is attributed to the existence of high-field domains. We used photoluminescence (PL) spectroscopy to identify the existing domains as a function of electric field perpendicular to the layers. A total of five PL lines was observed and assigned to different domains through their Stark shift.


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