Coherent control in a single semiconductor quantum dot exhibiting excitonic and biexcitonic features

被引：1
|
作者：
Sen, P.
Qureshi, M. S.
Sen, P. K.
机构：
[1] Devi Ahilya Vishwavidyalaya, Sch Phys, Indore 452017, Madhya Pradesh, India
[2] Shri GS Inst Technol & Sci, Dept Appl Phys, Indore 452003, Madhya Pradesh, India
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2007年 / 88卷 / 01期
关键词：
D O I：
10.1007/s00340-007-2660-4
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We have developed a simplified theoretical model to analyze the phenomenon of coherent control in a single semiconductor quantum dot excited by a pair of optical pulses. The first pulse populates a biexciton state by two-photon absorption while the second pulse generates population in the exciton state via deexcitation from the biexciton state. We have used density-matrix analysis for a 3-level system to calculate the time dependent biexciton and exciton state populations. The usual 9x9 matrix has been reduced to a 6x6 matrix. The time variation of the population in each state and it's dependence on the pulse delay manifest coherent control. Numerical estimates made for In0.5Ga0.5As/GaAs single quantum dots qualitatively agree with the recent experimental results.
引用
收藏
页码：13 / 19
页数：7
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