OBSERVATION OF THE DARK EXCITON IN CDSE QUANTUM DOTS

被引：736

作者：

NIRMAL, M ^{[1
]}

NORRIS, DJ ^{[1
]}

KUNO, M ^{[1
]}

BAWENDI, MG ^{[1
]}

EFROS, AL ^{[1
]}

ROSEN, M ^{[1
]}

机构：

[1] USN,RES LAB,BEAM THEORY SECT,WASHINGTON,DC 20375

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.75.3728

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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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页码：3728 / 3731

页数：4

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