The exciton dynamics in InxGa1-xAs/GaAs quantum wells grown on (111)B and (
100) GaAs substrates were studied by time-resolved photoluminescence (PL) u
nder magnetic fields in a Faraday configuration. We have found that the pie
zoelectric fields in (111)B samples affect the transient behavior of the PL
spectra. Compared with the reference (100) sample, we have found that the
strong piezoelectric fields, as well as the magnetic fields, cause a slower
spin-flip process in (111)B strained quantum wells. (C) 2001 American Inst
itute of Physics.