Nonresonant carrier transfer in single InGaAs/GaAs quantum dot molecules

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

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We present a spectroscopic study of single quantum dot molecules (QDMs) formed by two closely stacked In0.5 Ga0.5 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.

Original languageEnglish
Article number245314
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number24
StatePublished - 13 Jun 2008


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