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

Xu, Zhangcheng; Birkedal, Dan; Hvam, Jørn M.; Zhao, Zongyan; Liu, Yanmei; Yang, Kuntang; Kanjilal, Aloke; Sadowski, Janusz
June 2003
Applied Physics Letters;6/2/2003, Vol. 82 Issue 22, p3859
Academic Journal
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. © 2003 American Institute of Physics.


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