Ultrafast electron transfer in type II GaAs/AlAs superlattices by femtosecond luminescence

Electron transfer from GaAs wells (Gamma wavefunctions) to AlAs barriers (X wavefunctions) in GaAs / AlAs type II superlattices has been studied by time resolved luminescence with femtosecond resolution. Transfer times can be as short as 140 fs for narrow wells and as long as 25 ps for the widest wells. They do not depend appreciably on the barrier thickness. We discuss the possible contribution to the transfer mechanism of state mixing, intervalley scattering and Frolich interaction. Our measurement favors phonon assisted, intervalley type scattering, modified by the overlap of the different wavefunctions.


Published in:
Annales De Physique, 20, 3, 215-227
Year:
1995
ISSN:
0003-4169
Keywords:
Note:
France telecom,ctr natl etud telecommun,f-22301 lannion,france. cnrs,l2m,f-92220 bagneux,france. france telecom,ctr natl etud telecommun,f-92120 bagneux,france. Deveaud, B, ECOLE POLYTECH FED LAUSANNE,CH-1015 LAUSANNE,SWITZERLAND.
ISI Document Delivery No.: TR867
Times Cited: 0
Cited Reference Count: 27
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