Abstract
Using polarized Raman spectroscopy and high resolution X-ray diffraction we have investigated self-organized In0.45Ga0.55As quantum-dot chains in InGaAs/GaAs multilayer structures. It is shown that the formation of InGaAs QDs in InGaAs/GaAs multilayered structures is accompanied by a strong improvement in the uniformity of size and shapes of QDs as well as vertical alignment and lateral ordering. At mean densities, extended chains of QDs (up to 5 μm) appear along the \( [1\bar 10] \) direction; however, increased ordering of QDs along the [110] direction could be observed, too. For the first time, InGaAs dot-chains were investigated using polarized Raman scattering. Observation of optical phonons localized in InGaAs QDs and two-dimensional (2D) layers is demonstrated. An obvious anisotropy in the intensity of Raman modes was observed when the electric field vector of the exciting laser beam is parallel or perpendicular to the wire-like axis \( [1\bar 10] \) of dot-chains. This effect may be related to symmetry lowering effects and real anisotropic geometry of the QDs and 2D wetting layers.
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Notes
The phonon line at ≈528-531 cm−1 can correspond to the combined mode of LO(InAs)-like (≈240 сm−1) + LO(GaAs)-like (≈287 сm−1).
The degree of linear polarization of the PL band in GaAs QDs is estimated using the ratio \( {{(I_{[1\bar 10]} - I_{[110]} )} \mathord{\left/ {\vphantom {{(I_{[1\bar 10]} - I_{[110]} )} {(I_{[1\bar 10]} + \,I_{[110]} )}}} \right. \kern-\nulldelimiterspace} {(I_{[1\bar 10]} + \,I_{[110]} )}} \) is equal to ≈18%, which coincides with the results obtained for these samples in non-resonant conditions of excitation.
The experimental value of the frequency for the LO(GaAs)-like band in QDs was determined with account of the partial position for the low-frequency 2LO(GaAs)-like phonon line at ≈528–531 сm−1.
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Strelchuk, V.V., Mazur, Y.I., Wang, Z.M. et al. Polarized Raman spectroscopy and X-ray diffuse scattering in InGaAs/GaAs(100) quantum-dot chains. J Mater Sci: Mater Electron 19, 692–698 (2008). https://doi.org/10.1007/s10854-007-9381-7
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DOI: https://doi.org/10.1007/s10854-007-9381-7