Magneto-optical properties of charged excitons in quantum dots

C. Schulhauser, D. Haft, R. J. Warburton, K. Karrai, A. O. Govorov, A. V. Kalameitsev, A. Chaplik, W. Schoenfeld, J. M. Garcia, P. M. Petroff

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Abstract

We present results on the influence of a magnetic field on excitons in semiconductor quantum dots, concentrating on the diamagnetic curvature. We use samples with a bimodal ensemble photoluminescence (PL) and we find that for the low-energy PL branch, the diamagnetic curvature is independent of charge, yet for the high-energy branch, the diamagnetic curvature is strongly reduced with excess charge. Guided by model calculations, we interpret the two classes as typical of the strong and intermediate confinement regimes. In the light of this, we predict that in the weak confinement regime the excitonic diamagnetic shift is strongly dependent on surplus charge, corresponding to a reversal in sign of the conventional diamagnetic shift for neutral excitons.

Original languageEnglish
Article number193303
Pages (from-to)1933031-1933034
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume66
Issue number19
Publication statusPublished - 15 Nov 2002

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    Schulhauser, C., Haft, D., Warburton, R. J., Karrai, K., Govorov, A. O., Kalameitsev, A. V., Chaplik, A., Schoenfeld, W., Garcia, J. M., & Petroff, P. M. (2002). Magneto-optical properties of charged excitons in quantum dots. Physical Review B: Condensed Matter and Materials Physics, 66(19), 1933031-1933034. [193303].