Resonant femtosecond emission from quantum well excitons: The role of Rayleigh scattering and luminescence
Resonant femtosecond emission from quantum well excitons: The role of Rayleigh scattering and luminescence
复制标题
量子阱激子的共振飞秒发射：瑞利散射和发光的作用
DOI：
10.1103/physrevlett.78.2228
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发表时间：
1997
影响因子：
8.6
通讯作者：
B. Deveaud
中科院分区：
文献类型：
--
作者：
S. Haacke;R. Taylor;R. Zimmermann;I. Bar;B. Deveaud
研究了共振激发下半导体量子阱二次辐射的超快特性。我们证明了激子密度的依赖关系使人们能够确定二次辐射的起源。在激子密度较高时，发射为非相干发光，其上升时间由激子-激子散射决定。在低密度下，当激子之间的距离远大于激子直径时，时间形状与密度无关，并呈二次曲线上升，这与最近的共振瑞利散射理论非常一致。[S0031-9007(97)02590-8]
We study the ultrafast properties of secondary radiation of semiconductor quantum wells under resonant excitation. We show that the exciton density dependence allows one to identify the origin of secondary radiation. At high exciton densities, the emission is due to incoherent luminescence with a rise time determined by exciton-exciton scattering. For low densities, when the distance between excitons is much larger than their diameter, the temporal shape is independent of density and rises quadratically, in excellent agreement with recent theories for resonant Rayleigh scattering. [S0031-9007(97)02590-8]