激子
量子点
物理
比克西顿
凝聚态物理
交换互动
自旋(空气动力学)
电子
磁场
声子
原子物理学
量子力学
铁磁性
热力学
作者
M. Nirmal,David J. Norris,Masaru Kuno,Moungi G. Bawendi,Alexander L. Efros,M. Rosen
标识
DOI:10.1103/physrevlett.75.3728
摘要
We use external magnetic fields to identify the band edge emitting state in CdSe quantum dots. The field dependence of emission decays and LO phonon spectra show the importance of exciton spin dynamics in the recombination mechanism. To interpret our results we calculate the band edge exciton structure, including the effects of the electron-hole exchange interaction and a nonspherical shape. The exchange term, negligible in the bulk, is strongly enhanced by quantum confinement and allows the observation of an optically passive "dark" excitonic state.
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