Excitonic photoluminescence in semiconductor quantum wells: Plasma versus excitons
Excitonic photoluminescence in semiconductor quantum wells: Plasma versus excitons
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DOI：
10.1103/physrevlett.92.067402
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发表时间：
2004-02-13
影响因子：
8.6
通讯作者：
Stolz, H
中科院分区：
文献类型：
--
作者：
Chatterjee, S;Ell, C;Stolz, H
非共振激发后的时间分辨光致发光光谱显示出明显的1s共振，与束缚激子的存在无关。微观分析确定了激子和电子空穴等离子体的贡献。对于低温和低密度，激子发射对电子-空穴对布居的细节极其敏感，这使得识别光学活跃激子的微小部分成为可能。
Time-resolved photoluminescence spectra after nonresonant excitation show a distinct 1s resonance, independent of the existence of bound excitons. A microscopic analysis identifies exciton and electron-hole plasma contributions. For low temperatures and low densities, the excitonic emission is extremely sensitive to details of the electron-hole-pair population making it possible to identify even minute fractions of optically active excitons.