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Exciton absorption saturation by phase-space filling: Influence of carrier temperature and density

Sättigung der Exzitonenabsorption durch Phasenraumfüllen: Einfluß von Trägertemperatur und Dichte
: Hunsche, S.; Leo, K.; Kurz, H.; Köhler, K.


Physical Review. B 49 (1994), No.23, pp.16565-16568
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Journal Article
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductors; quantum wells; time resolved optical measurement; zeitaufgelöste optische Messung

We investigate the temporal evolution and the density dependence of exciton bleaching in GaAs/Al (ind x) Ga (ind 1-x) As quantum wells. We find that the carrier-induced reduction of exciton oscillator strength is not influenced by carrier cooling after creation of hot carriers with femtosecond laser pulses. Excitation density experiments suggest that either phase-space filling or Coulomb screening dominates the exciton bleaching, depending on the carrier density.