SPECTRALLY RESOLVED OVERHAUSER SHIFTS IN SINGLE GAAS ALXGA1-XAS QUANTUM DOTS/

In this work, the direct observation of spectrally resolved, polarizat ion-dependent shifts in excitonic Zeeman splittings arising from dynam ic polarization of lattice nuclei (the Overhauser effect) in single qu antum dots is reported. Overhauser shifts corresponding to effective n uclear fields greater than 1.3 T were observed from quantum dots in a 4.2-nm-wide quantum well. These electron-nuclear interactions are an i mportant aspect of the optical properties of quantum dots and may sign ificantly affect recombination dynamics in quantum dots even in the ab sence of an external magnetic field.