1. Optical properties of one- and two-dimensional excitons inm-plane ZnO/MgZnO multiple quantum wells
- Author
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C. Y. Tsai, Yin-Hsien Huang, Cheng-Tzu Kuo, Hsiang-Jung Chen, Hsu Cheng Hsu, and Wen-Feng Hsieh
- Subjects
Condensed Matter::Quantum Gases ,010302 applied physics ,Materials science ,Acoustics and Ultrasonics ,Condensed matter physics ,Condensed Matter::Other ,Phonon ,Exciton ,Heterojunction ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Blueshift ,Pulsed laser deposition ,Condensed Matter::Materials Science ,Quantum dot ,0103 physical sciences ,0210 nano-technology ,Biexciton ,Quantum well - Abstract
Five pairs of ZnO/Zn0.9Mg0.1O multiple quantum wells (MQWs) with fixed barrier thickness of 55 nm and three well widths of 4, 8 and 16 nm have been grown on m-plane sapphires by pulsed laser deposition. Due to 2D quantum confinement with decreasing well width, the emission of excitons bound to the basal-plane stacking faults, which are one-dimensionally confined in MQWs, encounters larger blue shift than that of the near-band edge excitons. Furthermore, remarkably reducing coupling of free excitons with A 1 longitudinal optical phonons is closely correlated with increasing exciton binding energy but enhanced coupling of E 2-low phonons is a result of increasing interaction with the interface phonons with decreasing well width.
- Published
- 2016
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