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Photoluminescence spectrum of self-assembled Ge quantum dots under excitation with wavelength of . The inset is the cross-sectional transmission electron microscopy image of the sample in this study.
Polarized photoluminescence spectra of self-assembled Ge quantum dots in the and  directions.
Schematic diagram of the bond sequence and the polarization of the corresponding interatomic optical transition at the interface.
(Color online) Polarized photoluminescence spectra of multiple quantum wells.
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