標題: Exciton fine structures and energy transfer in single InGaAs quantum-dot molecules
作者: Lin, Hsuan
Wang, Sheng-Yun
Lin, Chia-Hsien
Chang, Wen-Hao
Cheng, Shun-Jen
Lee, Ming-Chih
Chen, Wen-Yen
Hsu, Tzu-Min
Hsieh, Tung-Po
Chyi, Jen-Inn
電子物理學系
Department of Electrophysics
公開日期: 2009
摘要: We present a spectroscopic study of single quantum-dot molecules (QDMs) formed by two closely stacked In(0.5)Ga(0.5)As/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 microphotoluminescence measurements. With the increasing temperature, the direct-exciton intensity decreases while the indirect-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. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI: http://hdl.handle.net/11536/15687
http://dx.doi.org/10.1002/pssc.200880623
ISSN: 1610-1634
DOI: 10.1002/pssc.200880623
期刊: PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 4
Volume: 6
Issue: 4
起始頁: 860
結束頁: 863
顯示於類別:會議論文


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