Optical anisotropy in vertically coupled quantum dots

Ping Yu, Wolfgang Werner Langbein, Kristjan Leosson, Jørn Märcher Hvam, N. N. Ledentsov, Dieter Bimberg, V. M. Ustinov, A. Yu. Egorov, A. E. Zhukov, A. F. Tsatsul'nikov, Yu. G. Musikhin

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We have studied the polarization of surface and edge-emitted photoluminescence (PL) from structures with vertically coupled In0.5Ga0.5As/GaAs quantum dots (QD's) grown by molecular beam epitaxy. The PL polarization is found to be strongly dependent on the number of stacked layers. While single-layer and 3-layer structures show only a weak TE polarization, it is enhanced for 10-layer stacks. The 20-layer stacks additionally show a low-energy side-band of high TE polarization, which is attributed to laterally coupled QD's forming after the growth of many layers by lateral coalescence of QD's in the upper layers. While in the single, 3- and 10-layer stacks, both TE polarized PL components an stronger than the TM component, the [110] TE component is weaker than the TM component in the 20-layer stack. This polarization reversal is attributed to an increasing vertical coupling with increasing layer number due to increasing dot size.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Issue number24
Pages (from-to)16680-16685
Publication statusPublished - 1999

Bibliographical note

Copyright (1999) by the American Physical Society.


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Yu, P., Langbein, W. W., Leosson, K., Hvam, J. M., Ledentsov, N. N., Bimberg, D., Ustinov, V. M., Egorov, A. Y., Zhukov, A. E., Tsatsul'nikov, A. F., & Musikhin, Y. G. (1999). Optical anisotropy in vertically coupled quantum dots. Physical Review B Condensed Matter, 60(24), 16680-16685. https://doi.org/10.1103/PhysRevB.60.16680