Impacts of structural asymmetry on the magnetic response of excitons and biexcitons in single self-assembled In(Ga)As quantum rings

被引：27
作者：
Lin, Ta-Chun [1 ]
Lin, Chia-Hsien [2 ]
Ling, Hong-Shi [1 ]
Fu, Ying-Jhe [1 ]
Chang, Wen-Hao [2 ]
Lin, Sheng-Di [1 ]
Lee, Chien-Ping [1 ]
机构：
[1] Natl Chiao Tung Univ, Dept Elect Engn, Hsinchu 300, Taiwan
[2] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 08期
关键词：
biexcitons; cyclotron resonance; electron-hole recombination; excitons; gallium arsenide; III-V semiconductors; indium compounds; localised states; self-assembly; semiconductor quantum dots; PERSISTENT CURRENTS; SPECTROSCOPY; DOTS; LOOP;
D O I：
10.1103/PhysRevB.80.081304
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The diamagnetic shifts of neutral excitons and biexcitons confined in single self-assembled In(Ga)As/GaAs quantum rings are investigated. Unlike quantum dots, quantum rings reveal a considerably large biexciton diamagnetic shift, about two times larger than that of single excitons. Based on model calculations, we found that the inherent structural asymmetry and imperfection, combined with the interparticle Coulomb interactions, is the fundamental cause of the more extended biexciton wave function in the quantum rings. The exciton wave function tends to be localized in one of the potential valleys induced by structural imperfections of the quantum ring due to the strong localization of hole and the electron-hole Coulomb attraction, resembling the behavior in single dots. Our results suggest that the phase coherence of neutral excitons in quantum rings will be smeared out by such wave function localizations.
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页数：4
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