Relevance of dephasing processes for the ultrafast rise of emission from resonantly created excitons in quantum wells

We present a comparative study of time-integrated four-wave-mixing and femtosecond emission under resonant excitation on excitons in weakly disordered GaAs quantum wells. At highest exciton densities when dephasing dominates the spectral width (homogeneous broadening), we find that the rise time of the incoherent luminescence signal is given by T-2/2. At lowest densities, optical coherence times approach the exciton radiative lifetime (15 to 20 ps). This confirms our previous result that coherent resonant Rayleigh scattering is responsible for the short rise time of the excitonic emission. We also show clear evidence for dephasing due to exciton-phonon interaction, as the rise time of the emission decreases dramatically when the sample temperature is increased.


Published in:
Physica Status Solidi B-Basic Research, 204, 1, 35-38
Year:
1997
ISSN:
0370-1972
Keywords:
Note:
Univ oxford,dept phys,clarendon lab,oxford ox1 3pu,england. humboldt univ berlin,inst phys,d-10117 berlin,germany. weizmann inst sci,dept phys,il-76100 rehovot,israel. Haacke, S, SWISS FED INST TECHNOL,DEPT PHYS,IMO,CH-1015 LAUSANNE,SWITZERLAND.
ISI Document Delivery No.: YJ654
Times Cited: 6
Cited Reference Count: 6
Cited References:
CITRIN DS, 1996, PHYS REV B, V54, P14527
HAACKE S, IN PRESS
HAACKE S, OSA TECHNICAL DIGEST, V11
HAACKE S, 1997, PHYS REV LETT, V78, P2228
WANG HL, 1995, PHYS REV LETT, V74, P3065
ZIMMERMANN R, 1995, NUOVO CIMENTO D, V17, P1801
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 Record created 2007-08-31, last modified 2018-03-17


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