MAGNETOOPTICAL PROPERTIES OF SELF-ORGANIZED STRAINED INGAAS QUANTUM DISKS

We have measured the optical properties of self-organized strained InG aAs quantum disks in high magnetic fields. The disks are formed during spontaneous reorganization of a sequence of AlGaAs and strained InGaA s epitaxial films grown on GaAs (311)B substrates by metallorganic vap or-phase epitaxy. The magneto-luminescence properties of these InGaAs quantum disks have been studied for various disks sizes with lateral w idths from 100 nm down to 20 nm. We have confirmed that when the later al confinement exists the exciton binding energy increases even when t he spatial extent of the effective potential is greater than the excit on in-plane Bohr radius. This enhancement starts being noticeable when the spatial extent of the potential is two, three times larger than t he Bohr radius, where the center-of-mass quantization is negligibly sm all.