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首页> 外文期刊>Physical review letters >Coherence Length of Cold Exciton Gases in Coupled Quantum Wells
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Coherence Length of Cold Exciton Gases in Coupled Quantum Wells

机译:耦合量子阱中冷激子气体的相干长度

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摘要

A Mach-Zehnder interferometer with spatial and spectral resolution was used to probe spontaneous coherence in cold exciton gases, which are implemented experimentally in the ring of indirect excitons in coupled quantum wells. A strong enhancement of the exciton coherence length is observed at temperatures below a few Kelvin. The increase of the coherence length is correlated with the macroscopic spatial ordering of excitons. The coherence length at the lowest temperature corresponds to a very narrow spread of the exciton momentum distribution, much smaller than that for a classical exciton gas.
机译:具有空间和光谱分辨率的Mach-Zehnder干涉仪用于探测冷激子气体中的自发相干,这是在耦合量子阱中的间接激子环中通过实验实现的。在低于几个开尔文的温度下观察到激子相干长度的强烈增加。相干长度的增加与激子的宏观空间排序相关。最低温度下的相干长度对应于激子动量分布的非常窄的分布,远小于经典激子气体的分布。

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