Random telegraph signal in the photoluminescence intensity of a single quantum dot

被引：684

作者：

Efros, AL

Rosen, M

机构：

[1] Nanostructure Optics Section, Naval Research Laboratory, Washington, DC

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.78.1110

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose a model in which the time dependence of the photoluminescence intensity of a single nanosize quantum dot under cw excitation conditions shows a sequence of ''on'' and ''off'' periods similar to a random telegraph signal. In our model the off periods are the times when the dot is ionized and the luminescence is quenched by nonradiative Auger recombination. The duration of the on periods depends on the ionization rate of the dot via thermal or Auger autoionization, and depends strongly on excitation intensity. Numerical simulations reproduce the random intermittency recently observed in the photoluminescence intensity of a single CdSe quantum dot.

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页码：1110 / 1113

页数：4

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