Le Journal de Physique IV 03 (1993) C5-27-C5-30
Picosecond photoluminescence of resonantly-excited excitons in GaAs quantum wellsA. VINATTIERI1, J. SHAH2, T.C. DAMEN2, D.S. KIM2, L.N. PFEIFFER3 and L.J. SHAM4
1 Dipartimento di Fisica dell'Universita', Largo E. Fermi 2, 50125 Firenze, Italy
2 AT[MATH]T Bell Laboratories, Holmdel, NJ 07733, U.S.A.
3 AT[MATH]T Bell Laboratories, Murray Hill, NJ 07974, U.S.A.
4 University of California at San Diego, La Jolla, CA 92093, U.S.A.
We show that the initial dynamics of resonantly-excited excitons in quantum wells is controlled by several processes such as radiative recombination, spin relaxation of excitons, electrons and holes, and scattering between different in-plane momentum states of excitons. We present a unifïed analysis of the results, which provides quantitative information about these important rates, and a good physical understanding of the initial dynamics of nonequilibrium excitons. In particular, we show that the enhanced radiative recombination rate of excitons makes an important contribution to the early decay of the photoluminescence.
© EDP Sciences 1993