Optical transitions in charged CdSe quantum dots

被引：69

作者：

Franceschetti, A ^{[1
]}

Zunger, A ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.62.R16287

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using a many-body approach based on single-particle pseudopotential wave functions, we calculate the dependence of the optical transitions in CdSe nanocrystals on the presence of "spectator" electrons or holes. We find that (i) as a result of the different localization of the electron and hole wave functions, the absorption lines shift by as much as 22 meV/unit charge when electrons or holes are loaded into the quantum dot. (ii) The lowest emission line is significantly red shifted with respect to the lowest allowed absorption line. (iii) Trapping of;a "spectator" hole in a surface state is predicted to lead to dramatic changes in the absorption spectrum, including the appearance of new transitions.

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页码：R16287 / R16290

页数：4

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