Abstract
Optical spin injection is studied in novel laterally-arranged self-assembled InAs/GaAsquantum dot structures, by using optical orientation measurements in combination withtunable laser spectroscopy. It is shown that spins of uncorrelated free carriers are betterconserved during the spin injection than the spins of correlated electrons and holes in anexciton. This is attributed to efficient spin relaxation promoted by the electron–holeexchange interaction of the excitons. Our finding suggests that separate carrier injection,such as that employed in electrical spin injection devices, can be advantageous for spinconserving injection. It is also found that the spin injection efficiency decreases for freecarriers with high momentum, due to the acceleration of spin relaxation processes.
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