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.
WOS:A1994QA79500011
1994
15
4
427
431
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
Cited Reference Count: 23
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