Le Journal de Physique IV 03 (1993) C5-229-C5-232
Electric field induced [MATH]-X transition in GaAs-AlAs coupled quantum well structuresM. HAGN, A. ZRENNER, G. BÖHM and G. WEIMANN
Walter Schottky Institut, Technische Universität München, Am Coulombwall, 85748 Garching, Germany
Phonon replicas are investigated at the electric field induced Γ-X transition in GaAs/AlAs coupled quantum well structures by photoluminescence spectroscopy. In the real- and k-space indirect regime the observed replicas are assigned to AlAs LO, TO and LA zone-edge phonons. At the indirect-direct transition those phonons disappear and a new replica emerges, which is assigned as a GaAs-LO phonon at the Γ-point. The observed phonon replicas are shown to be a local probe for the distribution of the ground state electronic wave function in the GaAs/AlAs coupled quantum well structure.
© EDP Sciences 1993