Exciton fine structures and energy transfer in single InGaAs quantum-dot molecules

Hsuan Lin, Sheng Yun Wang, Chia Hsien Lin, Wen Hao Chang, Shun Jen Cheng, Ming Chih Lee, Wen Yen Chen, Tzu Min Hsu, Tung Po Hsieh, Jen Inn Chyi

研究成果: 雜誌貢獻會議論文同行評審


We present a spectroscopic study of single quantum-dot molecules (QDMs) formed by two closely stacked In0.5Ga0.5As/GaAs layers. It was found that the interdot coupling and directional energy transfer between the two adjacent dots can be controlled by temperature tuning. Direct and indirect excitons, as well as charged excitons in single QDMs were classified and identified by excitation-power dependent, excitation-energy dependent and polarization-resolved micro-photoluminescence measurements. With the increasing temperature, the direct-exciton intensity decreases while the indi-rect-exciton intensity increases. A rate equation model considering phonon mediated processes has been developed. The directional energy transfer in QDMs is explained in terms of the phonon-assisted tunnelling of hole between the two adjacent dots.

頁(從 - 到)860-863
期刊Physica Status Solidi (C) Current Topics in Solid State Physics
出版狀態已出版 - 2009
事件5th International Conference on Semiconductor Quantum Dots, QD 2008 - Gyeongju, Korea, Republic of
持續時間: 11 5月 200816 5月 2008


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