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

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

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24 Scopus citations

Abstract

Nonlinear Zeeman splitting of neutral excitons is observed in composition-engineered In xGa 1-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 measurements, 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 are shown to strongly enhance the nonlinear contribution to the excitonic Zeeman gap, providing a blueprint to enhance such magnetic nonlinearities via growth engineering of the quantum dots.

Original languageEnglish
Article number165433
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number16
DOIs
StatePublished - 16 Apr 2012

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