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Electron capture times in a separate confinement quantum well (QW) structurewith finite electron density are calculated for electron-electron (e-e) andelectron-polar optic phonon (e-pop) scattering. We find that the capture timeoscillates as function of the QW width for both processes with the same period,but with very different amplitudes. For an electron density of 10^11 cm^-2 thee-e capture time is 10-1000 times larger than the e-pop capture time except forQW widths near the resonance minima, where it is only 2-3 times larger. Withincreasing electron density the e-e capture time decreases and near theresonance becomes smaller than the e-pop capture time. Our e-e capture timevalues are two-to-three orders of magnitude larger than previous results ofBlom et al. [Appl. Phys. Lett. 62, 1490 (1993)]. The role of the e-e capture inQW lasers is therefore readdressed.

Electron capture in GaAs quantum wells via electron-electron and optic phonon scattering