Size dependence of exciton fine structure in CdSe quantum dots
Size dependence of exciton fine structure in CdSe quantum dots
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DOI：
10.1103/physrevb.53.16347
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发表时间：
1996-06-15
影响因子：
3.7
通讯作者：
Bawendi, MG
中科院分区：
文献类型：
--
作者：
Norris, DJ;Efros, AL;Bawendi, MG
利用光致发光激发和荧光窄化光谱对CdSe量子点的带边吸收特性进行了结构分析。我们研究了8个半径从15到50埃的样品，以探索这种结构的尺寸依赖性。我们将我们的结果与最近的理论进行了比较，这些理论预测了由于CdSe点的内部晶体结构，非球形形状以及电子和空穴之间的交换相互作用而导致的带边激子分裂。我们发现我们的数据和理论之间有合理的一致性，支持激子精细结构的观察。
We use photoluminescence excitation and fluorescence line narrowing spectroscopies to examine structure observed in the band-edge absorption feature of CdSe quantum dots. We study eight samples ranging from similar to 15 to similar to 50 Angstrom in radius to probe the size dependence of this structure. We compare our results with recent theories, which predict band-edge exciton splittings in CdSe dots due to their internal crystal structure, non-spherical shape, and the exchange interaction between the electron and hole. We find reasonable agreement between our data and theory, supporting the observation of exciton fine structure.