Abstract
We have studied the spin dynamics in nonintentionally doped and n-modulation doped self-organized InAs/GaAs quantum dots (QD) by time-resolved photoluminescence. Under strictly resonant excitation, we demonstrate that the carrier spins in these nanostructures are totally frozen on the neutral or charged exciton lifetime scale. In addition, we show that the spin state of the resident electron in n-doped self-assembled InAs–GaAs QD can be written and read using nonresonant, circularly polarized optical pumping. A simple theoretical model is presented and accounts for the remarkable dynamics producing counter-polarized photoluminescence in such structures.
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