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Fig. 8 | Nanoscale Research Letters

Fig. 8

From: RETRACTED ARTICLE: Enhanced Emission of Quantum System in Si-Ge Nanolayer Structure

Fig. 8

a Physical model of quasi-direct-bandgap emission with a three-level system built in the Si-Ge layers structure, in which the rise of X valley in nanosilicon and L valley in nanogermanium forms the pumping levels, and the Γ valley of Ge direct-gap band or the localized state near Si edge band becomes emission level with inverse population. b Structures of three levels in the Si-Ge layer quantum system, in which the states of Si-Ge QDs are higher to be pumping levels for population inversion in the Γ valley of Ge

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