Abstract
We present a magneto-optical study of ZnSe/ Se quantum-well structures in which a suitable choice of the Cd composition leads to a system that is type I at zero magnetic field. When a magnetic field is applied perpendicular to the layers of the structure, the band edges split in such a way as to make the upper (+, +) exciton transition type II, while the ground state (-, -) exciton component remains type I at all field values. This alignment reduces the probability for carrier relaxation from the higher-energy exciton component and opens the possibility of hole-spin population inversion via optical pumping.
DOI:https://doi.org/10.1103/PhysRevB.55.1602
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