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Absorption imaging of trapped 1s paraexcitons in bulk Cu_2O

机译:大量Cu_2O中捕获的1s对正激子的吸收成像

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摘要

We demonstrate absorption imaging of 1s paraexcitons in a strain-induced trap potential in bulk semiconductor Cu_2O. Using excitonic 1s-2p induced absorption in the midinfrared region, clear images of exciton ensembles are taken at liquid-helium temperatures. The observed spatial spread and redshift of the ls-2p resonance prove that the images are of a thermalized gas of trapped 1s paraexcitons. With its high sensitivity, midinfrared absorption imaging is especially important for characterizing quantum degenerate paraexcitons including Bose-Einstein condensates at near 100 mK temperatures, as they do not luminesce because of the principle of momentum conservation.
机译:我们展示了在体半导体Cu_2O中的应变诱导陷阱势中1s对激子的吸收成像。使用激子1s-2p在中红外区域引起的吸收,在液氦温度下拍摄了激子集合的清晰图像。观察到的ls-2p共振的空间扩展和红移证明图像是捕获的1s对激子的热化气体。凭借其高灵敏度,中红外吸收成像对于表征量子简并的超激子(包括Bose-Einstein凝聚物)在接近100 mK的温度下特别重要,因为由于动量守恒原理它们不会发光。

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