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We reveal the dynamics of carrier-induced screening of the internal electric field in ZnO quantum wells. By controlling the potential profile of the quantum wells we demonstrate the ability to tune the excited state lifetimes.
We have performed one and two colour, spectrally resolved four-wave mixing (FWM) experiments on a series of ZnO/Zn1-xMgxO quantum wells with different oxygen ion implantation doses. The results show that at room temperature and with resonant excitation, excitonic coherences are maintained beyond the duration of the laser pulse. A transient signal observed at negative delays in the two-colour experiments...
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