Abstract
We resonantly excite excitons associated with the second electron and heavy hole subbands (n=2 excitons) in 13 and 17.5 nm GaAs quantum wells (QWs) at 8 K to perform femtosecond degenerate four wave mixing measurements. We deduce the lifetime T1 of the n=2 excitons to be ≈890 fs and ≈2.63 ps, respectively, for the 13 and 17.5 nm QWs.
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