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首页> 外文期刊>Solid State Communications >Observation of ortho and para-excitons by time-resolved excitonic Lyman spectroscopy
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Observation of ortho and para-excitons by time-resolved excitonic Lyman spectroscopy

机译：时间分辨激子莱曼光谱法观察正激子和对激子

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A review of our recent experiments on the detection of ortho- and para-excitons in Cu2O by the induced absorption associated with an internal excitonic transition (1s to 2p) is presented. In order to evaluate the temporal and spatial dynamics of the excitons, we developed a time-resolved mid-infrared femtosecond pump-probe spectroscopy analysis technique. Because of the large difference in the electron-hole exchange energy between the 1s and 2p excitons (12 and nearly 0 meV, respectively), we can distinguish ortho-excitons from para-excitons in mid-infrared pump probe spectra. Since the transition energy depends on the momenta of excitons because of the difference between the 1s and 2p exciton masses, we can obtain information on the thermal distribution of excitons. We successfully detected a signal associated with para-excitons. Based on the experimental results, we discuss the basic problems to be solved for the observation of exciton BEC, such as para-exciton mass, Auger recombination and ortho to para exciton conversion. (c) 2004 Elsevier Ltd. All rights reserved.
机译：介绍了我们最近关于通过与内部激子跃迁相关的诱导吸收（1s至2p）检测Cu2O中的正激子和对激子的实验。为了评估激子的时空动力学，我们开发了一种时间分辨的中红外飞秒泵浦探针光谱分析技术。由于1s和2p激子之间的电子-空穴交换能量差异很大（分别为12和接近0 meV），我们可以在中红外泵浦探针光谱中区分正激子和对激子。由于1s和2p激子质量之间的差异，跃迁能量取决于激子的动量，因此我们可以获得激子热分布的信息。我们成功检测到与对激子有关的信号。基于实验结果，我们讨论了对激子BEC观察需要解决的基本问题，如准激子质量，俄歇复合和原位到副激子转化。 （c）2004 Elsevier Ltd.保留所有权利。

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