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

Autor:	Hsuan Lin, Jen-Inn Chyi, Wen-Hao Chang, Tung Po Hsieh, Wen Yen Chen, Chia Hsien Lin, Sheng Yun Wang, Tzu Min Hsu, Ming Chih Lee, Shun-Jen Cheng
Rok vydání:	2009
Předmět:	Condensed Matter::Materials Science Photoluminescence Phonon Chemistry Exciton Rate equation Emission spectrum Atmospheric temperature range Atomic physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Quantum tunnelling Spectral line
Zdroj:	physica status solidi c. 6:860-863
ISSN:	1610-1642 1862-6351
Popis:	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 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. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3d3c9944be83885a6c9a087df20e578b https://doi.org/10.1002/pssc.200880623 Zobrazit plný text záznamu Plný text