Enhanced resonant backscattering of excitons in disordered quantum wells
Enhanced resonant backscattering of excitons in disordered quantum wells
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DOI：
10.1103/physrevlett.89.157401
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发表时间：
2002-10-07
影响因子：
8.6
通讯作者：
Zimmermann, R
中科院分区：
文献类型：
--
作者：
Langbein, W;Runge, E;Zimmermann, R
在无序量子威尔斯阱中局域二维激子的定向共振瑞利散射中，观察到激子的背散射增强的明显特征。它的光谱依赖性和时间动力学的测量和理论预测的定量方法。强度增强具有延伸到外部光发射锥之外的大动量跨度。这是一个小的局域化长度的激子作为一个大质量的粒子探测接近带底的结果。局域化长度可以通过光子动能来控制。这与物理学其他分支中的后向散射现象有质的区别。
A clear signature of enhanced backscattering of excitons is observed in the directional resonant Rayleigh scattering of light from localized two-dimensional excitons in disordered quantum wells. Its spectral dependence and time dynamics are measured and theoretically predicted in a quantitative way. The intensity enhancement has a large momentum span extending beyond the external light emission cone. This is a consequence of the small localization length of the exciton as a massive particle probed close to the band bottom. The localization length can be controlled by the photon kinetic energy. This constitutes a qualitative difference to backscattering phenomena in other branches of physics.