Resonant femtosecond emission from quantum well excitons: The role of Rayleigh scattering and luminescence

We study the ultrafast properties of secondary radiation of semiconductor quantum wells under resonant excitation. We show that the exciton density dependence allows one to identify the origin of secondary radiation. At high exciton densities, the emission is due to incoherent luminescence with a rise time determined by exciton-exciton scattering. For low densities, when the distance between excitons is much larger than their diameter, the temporal shape is independent of density and rises quadratically, in excellent agreement with recent theories for resonant Rayleigh scattering.


Published in:
Physical Review Letters, 78, 11, 2228-2231
Year:
1997
ISSN:
0031-9007
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,INST MICRO & OPTOELECT,CH-1015 LAUSANNE,SWITZERLAND.
ISI Document Delivery No.: WN079
Times Cited: 96
Cited Reference Count: 22
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