4-Wave-Mixing Signals from Extended Exciton-States above the Mobility Edge in Gaas (Ga,Al)as Multiple-Quantum Wells

We investigate the dependence of four-wave mixing response on the photon energy close to the fundamental exciton (X) resonance in GaAs quantum wells. We find that cross-polarised incident fields give rise to a non-linear signal which decays faster at energies below the X line centre than above. We show that this behaviour cannot be assigned to biexciton transitions alone but rather suggests that the delocalised X states above the mobility edge are excited off-resonantly by the laser light having slightly lower energies.


Published in:
Superlattices and Microstructures, 15, 4, 427-431
Year:
1994
ISSN:
0749-6036
Keywords:
Note:
Ecole polytech fed lausanne,ph ecublens,inst phys appl,ch-1015 lausanne,switzerland. Bongiovanni, g, univ cagliari,dipartimento sci fis,via osped 72,i-09124 cagliari,italy.
ISI Document Delivery No.: QA795
Times Cited: 1
Cited Reference Count: 23
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