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The oscillations of excitonic and nuclear spin polarizations in an optically pumped singleself-assembled In0.8Al0.2As/Al0.35Ga0.65As quantum dot  QD  were clearly observed under theexcitation of a wetting layer edge at B=5 T. This indicates that an exciton pair with opposite spinsis alternatively created via the half-localized state only by changing the delay time betweencross-linearly polarized pulse pair. Furthermore, periodic modulation of Zeeman energysynchronizes the degree of circular polarization of photoluminescence from a single QD, indicatingthat the Overhauser field follows the optically created electron spin polarization in half-localizedstates of a QD, and the half-localized state in a QD consists of a confined electron in a discrete stateand hole in the continuum state

journal of applied physics

Nuclear and excitonic spin polarization formed using cross-linearly polarized pulse pair via half-localized state in a single self-assembled quantum dot