Optical spin injection in InAs/GaAs quantum dot structures

What is it about?

Injection of spin-oriented charge carriers (electrons and holes) from a surrounding matrix into quantum dots is typically a rather fast process. Here we show, that it is preferable to inject free, uncorrelated spin-oriented charge carriers over the injection of excitons. It seems that the injection time is still long enough for the electron-hole-exchange interaction in excitons to reduce their spin-orientation degree compared to free carriers.

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