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arXiv 1902.04358cond-mat.mes-hall
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极化激元凝聚体临界温度的测定

Determination of polariton condensates' critical temperature

E. Rozas, M. D. Martín, C. Tejedor, L. Viña, G. Deligeorgis, Z. Hatzopoulos, P. G. Savvidis

摘要:

我们研究了行波极化激元凝聚的热鲁棒性。我们创造了从未接触过的远程凝聚体,并通过时间分辨光致发光研究了它们在动量空间中的干扰,当它们以相同的速度行进时。我们确定了凝聚态到热态、非凝聚态的极化激元分数,该分数随温度的升高而逐渐衰减,并得到了类玻色-爱因斯坦凝聚态(BEC)相变的临界温度.我们尝试性地将我们的实验结果与为原子凝聚体开发的理论模型进行比较,以描述凝聚体的相干性随温度的衰减。

英文摘要:

We investigate the thermal robustness of traveling polariton condensates. We create remote condensates that have never been in contact, and study their interference in momentum space, when they travel with the same velocity, by means of time-resolved photoluminescence. We determine the condensed to thermal, uncondensed polariton fraction, which shows a gradual decay with increasing temperature, and obtain the critical temperature for the Bose-Einstein-like condensate (BEC) phase transition. We tentatively compare our experimental findings with theoretical models, developed for atomic condensates, to describe the condensates' coherence fading with temperature.

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