Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots

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Abstract

The magneto-photoluminescence experiments have been performed on a coupled quantum dots (QDs) system composed of CdSe and CdMnSe QD double layers. The photoluminescence peaks from two QD layers forms a wide PL band due to the inhomogeneous broadening of QD ensemble in the coupled QD system. The intensity of the PL band undergoes significant change when a magnetic field is applied. Specifically, the QD system shows large difference in intensity between σ-and σ+circular polarizations, which results from the spin polarization of carriers in the presence of magnetic field. Interestingly, while the lower energy side of the PL band was dominated by the σ+circular polarization, the higher energy side of the band was dominated by the σ-circular polarization. Furthermore, the relative PL intensity at the low energy side of the band remarkably increases with decrease in excitation power for the σ+circular polarization, while it showed no significant change for σ-circular polarization. Such polarization and excitation power-dependent behaviors of PL intensity enable us to identify the relative potential profile of the magnetic/non-magnetic coupled QD systems. © 2008 Elsevier B.V. All rights reserved.

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Lee, S., Dobrowolska, M., & Furdyna, J. K. (2009). Polarization and excitation power-dependent photoluminescence of magnetic/non-magnetic coupled quantum dots. Journal of Crystal Growth, 311(3), 851–854. https://doi.org/10.1016/j.jcrysgro.2008.09.101

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