Direct measurement of acoustic-phonon scattering of hot quantum-well excitons

被引：5
|
作者：
Zhao, H [1 ]
Kalt, H [1 ]
机构：
[1] Univ Karlsruhe, Inst Angew Phys, D-76128 Karlsruhe, Germany
来源：
PHYSICAL REVIEW B | 2004年 / 69卷 / 23期
关键词：
D O I：
10.1103/PhysRevB.69.233305
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Due to their high momentum, hot excitons do not couple to photons directly. Thus, the interaction of excitons with phonons is typically studied only for zero-momentum excitons. We show here that the excitonic recombination process assisted by optical phonons provides a direct method to study the acoustic-phonon scattering of hot excitons in semiconductor quantum wells. From the thermal broadening of the hot-exciton luminescence, we obtain the broadening coefficient as a measure of the coupling strength. The coefficient is found to increase with exciton kinetic energy. This finding is in contrast to theoretical predictions taking into account only the direct exciton-phonon scattering process.
引用
收藏
页码：233305 / 1
页数：4
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