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

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

2011-12-12

arxiv.org/abs/1112.2585v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Non-linear Zeeman splitting of neutral excitons is observed in composition engineered In(x)Ga(1-x)As self-assembled quantum dots and its microscopic origin is explained. Eight-band k.p simulations, performed using realistic dot parameters extracted from cross-sectional scanning tunneling microscopy, reveal that a quadratic contribution to the Zeeman energy originates from a spin dependent mixing of heavy and light hole orbital states in the dot. The dilute In-composition (x<0.35) and large lateral size (40-50 nm) of the quantum dots investigated is shown to strongly enhance the non-linear excitonic Zeeman gap, providing a blueprint to enhance such magnetic non-linearities via growth engineering.

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