Highly nonlinear excitonic Zeeman spin splitting in composition-engineered artificial atoms

V. Jovanov, T. Eisfeller, S. Kapfinger, E.C. Clark, F. Klotz, M. Bichler, J.G. Keizer, P.M. Koenraad, M.S. Brandt, A.G. Abstreiter, J.J. Finley

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Abstract

Non-linear Zeeman splitting of neutral excitons is observed in composition engineerd InxGa1-xAS 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-linearitics via growth engineering
Original languageEnglish
Article number165433
Pages (from-to)165433-1/6
JournalPhysical Review B
Volume85
Issue number16
DOIs
Publication statusPublished - 2012

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