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内蒙古大学 物理科学与技术学院
收稿:2008-12-07,
修回:1900-1-2,
网络首发:2009-08-30,
纸质出版:2009-08-30
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王志平, 邢 雁, 王 旭. 球型核壳量子点结构中二类激子向一类激子的转化[J]. 发光学报, 2009,30(4):453-456.
WANG Zhi-ping, XING Yan, WANG Xu. Transformation from Type- Ⅱ to Type- Ⅰ Excitons in Spherical Core-shell Quantum Dots[J]. Chinese Journal of Luminescence, 2009, 30(4): 453-456.
在有效质量近似下
采用变分方法研究了球型核壳量子点中激子的性质。数值计算了电子波函数随位置的变化关系以及临界势随球壳宽度和核半径的比值的变化关系。结果表明
当球壳宽度和核半径的比值为给定值时
存在一临界势
当局域势减小到临界势时
激子从二类激子转化为一类激子;当局域势为给定值时
存在一临界比值
当球壳宽度和核半径的比值减小到临界比值时
激子亦从二类激子转化为一类激子。该结果对研究球型核壳量子点中的电子结构有参考价值。
paper
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