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Non-linear Zeeman splitting of neutral excitons is observed in compositionengineered In(x)Ga(1-x)As self-assembled quantum dots and its microscopicorigin is explained. Eight-band k.p simulations, performed using realistic dotparameters extracted from cross-sectional scanning tunneling microscopy, revealthat a quadratic contribution to the Zeeman energy originates from a spindependent mixing of heavy and light hole orbital states in the dot. The diluteIn-composition (x<0.35) and large lateral size (40-50 nm) of the quantum dotsinvestigated is shown to strongly enhance the non-linear excitonic Zeeman gap,providing a blueprint to enhance such magnetic non-linearities via growthengineering.

Highly Non-linear Excitonic Zeeman Spin-Splitting in Composition-Engineered Artificial Atoms