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Resonant optical excitation of lowest-energy excitonic transitions inself-assembled quantum dots lead to nuclear spin polarization that isqualitatively different from the well known optical orientation phenomena. Bycarrying out a comprehensive set of experiments, we demonstrate that nuclearspin polarization manifests itself in quantum dots subjected to finite externalmagnetic field as locking of the higher energy Zeeman transition to the drivinglaser field, as well as the avoidance of the resonance condition for the lowerenergy Zeeman branch. We interpret our findings on the basis of dynamic nuclearspin polarization originating from non-collinear hyperfine interaction and findan excellent agreement between the experimental results and the theoreticalmodel.

Dynamic nuclear spin polarization in resonant laser spectroscopy of a quantum dot