期刊
PHYSICAL REVIEW LETTERS
卷 95, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.95.257402
关键词
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A systematic variation of the exciton fine-structure splitting with quantum dot size in single InAs/GaAs quantum dots grown by metal-organic chemical vapor deposition is observed. The splitting increases from -80 to as much as 520 mu eV with quantum dot size. A change of sign is reported for small quantum dots. Model calculations within the framework of eight-band k center dot p theory and the configuration interaction method were performed. Different sources for the fine-structure splitting are discussed, and piezoelectricity is pinpointed as the only effect reproducing the observed trend.
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