標題: Nonresonant carrier transfer in single InGaAs/GaAs quantum dot molecules
作者: Chang, Wen-Hao
Lin, Hsuan
Wang, Sheng-Yun
Lin, Chia-Hsien
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: 1-Jun-2008
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 layers. The exciton fine structures as well as direct and indirect excitonic species associated with QDMs were identified by power dependent and polarization resolved microphotoluminescence measurements. As the temperature was increased, a directional energy transfer between the direct and indirect excitons in single QDMs was observed. A rate-equation model was developed to explain our data. We show that a phonon-assisted nonresonant tunneling of the hole between the two adjacent dots is responsible for such directional energy transfers in QDMs.
URI: http://dx.doi.org/10.1103/PhysRevB.77.245314
http://hdl.handle.net/11536/8743
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.77.245314
期刊: PHYSICAL REVIEW B
Volume: 77
Issue: 24
起始頁: 0
結束頁: 0
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