Picosecond time evolution of free electron-hole pairs into excitons in GaAs quantum wells

被引：56
|
作者：
Kumar, R
Vengurlekar, AS
Prabhu, SS
Shah, J
Pfeiffer, LN
机构：
[1] AT&T BELL LABS,HOLMDEL,NJ 07733
[2] AT&T BELL LABS,MURRAY HILL,NJ 07974
来源：
PHYSICAL REVIEW B | 1996年 / 54卷 / 07期
关键词：
D O I：
10.1103/PhysRevB.54.4891
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We measure picosecond time resolved luminescence,spectra in GaAs quantum wells using frequency upconversion luminescence spectroscopy. A careful line-shape analysis of the spectra is performed to separate the free exciton and free carrier related luminescence. From the time evolution of the free carrier luminescence, we deduce the characteristic time constant (tau(f)) for the bimolecular process of exciton formation by free electron-hole pairs. For an estimated initial carrier density of 4X10(10) cm(-2), tau(f) is found to be 50 ps.
引用
收藏
页码：4891 / 4897
页数：7
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