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Enhanced Piezoelectric Effects in Three-Dimensionally Coupled Self-Assembled Quantum Dot Structures
( Pil Kyung Moon ),( Young Soo Lee ),( Eung Jin Ahn ),( Jung Sub Kim ),( Chang Jae Yang ),( Gun Do Lee ),( Eui Joon Yoon ),( Jean Pierre Leburton ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 ELECTRONIC MATERIALS LETTERS Vol.2 No.2
We investigated the influence of piezoelectric effects on the quantum mechanical coupling in two types of self-assembled quantum dot (QD) configurations: (i) laterally ([110]) coupled structures and (ii) anti-correlated stacked structures, by using an eight-bands k?p method. We show that the valence band ground state of laterally coupled quantum dots (LCQDs) is highly localized in the coupling region. Optical transitions involving such a localized state exhibit strong red shifts compared to similar transitions in single QDs. Unlike LCQDs that show symmetric coupling between the two quantum dot (QD) wave functions, QDs on the upper and lower planes of the anti-correlated structures have asymmetric configurations, therefore the coupling occurs between different states in these two planes (mixed coupling). The origin of the spectral shift in the anticorrelated structures is interpreted in terms of the strain and confinement condition in the coupled QDs.