Structure and optical anisotropy of vertically correlated submonolayer InAs/GaAs quantum dots

Zhangcheng Xu, Dan Birkedal, Jørn Märcher Hvam, Z.Y. Zhao, Y.M. Liu, K.T. Yang, A. Kanjilal, J. Sadowski

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A vertically correlated submonolayer (VCSML) InAs/GaAs quantum-dot (QD) heterostructure was studied using transmission electron microscopy, high-resolution x-ray diffraction (HRXRD) and polarization-dependent photoluminescence. The HRXRD (004) rocking curve was simulated using the Tagaki-Taupin equations. Excellent agreement between the experimental curve and the simulation is achieved assuming that indium-rich VCSML QDs are embedded in a quantum well (QW) with lower indium content and an observed QD coverage of 10%. In the VCSML QDs, the vertical lattice mismatch of the InAs monolayer with respect to GaAs is around 1.4%, while the lattice mismatch in the QW is negligible. The photoluminescence is transverse magnetic-polarized in the edge geometry.
Original languageEnglish
JournalApplied Physics Letters
Issue number22
Pages (from-to)3859-3861
Publication statusPublished - 2003

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Copyright (2003) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


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