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Non-linear exciton spin-splitting in single InAs/GaAs self-assembled quantum structures in ultrahigh magnetic fields

A. Babinski·G. Ortner·S. Raymond·M. Potemski·M. Bayer·P. Hawrylak·A. Forchel·Z. Wasilewski·S. Fafard
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Abstract

We report on the magnetic field dispersion of the exciton spin-splitting and diamagnetic shift in single InAs/GaAs quantum dots (QDs) and dot molecules (QDMs) up to $B$ = 28 T. Only for systems with strong geometric confinement, the dispersions can be well described by simple field dependencies, while for dots with weaker confinement considerable deviations are observed: most importantly, in the high field limit the spin-splitting shows a non-linear dependence on $B$, clearly indicating light hole admixtures to the valence band ground state.

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A. Babinski, G. Ortner, S. Raymond, M. Potemski, M. Bayer, P. Hawrylak, A. Forchel, Z. Wasilewski, S. Fafard. 2005-03-11. Non-linear exciton spin-splitting in single InAs/GaAs self-assembled quantum structures in ultrahigh magnetic fields. https://doi.org/10.1103/physrevb.74.075310

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