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

doi:10.1103/PhysRevB.85.165433

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

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	165433
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.85.165433
State	Published - 16 Apr 2012

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Jovanov, V., Eissfeller, T., Kapfinger, S., Clark, E. C., Klotz, F., Bichler, M., Keizer, J. G., Koenraad, P. M., Brandt, M. S., Abstreiter, G., & Finley, J. J. (2012). Highly nonlinear excitonic Zeeman spin splitting in composition-engineered artificial atoms. Physical Review B - Condensed Matter and Materials Physics, 85(16), Article 165433. https://doi.org/10.1103/PhysRevB.85.165433

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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.",

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AU - Eissfeller, T.

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AU - Clark, E. C.

AU - Klotz, F.

AU - Bichler, M.

AU - Keizer, J. G.

AU - Koenraad, P. M.

AU - Brandt, M. S.

AU - Abstreiter, G.

AU - Finley, J. J.

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AB - 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.

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

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