Determination of Polariton Condensates’ Critical Temperature

The thermal robustness of traveling polariton condensates is investigated. create remotendensa that have never been in contact,and study the interference in momentumspace, when they travel with the same velocity e by means of effect photoluminescence. We determine the condensed thermal, uncondensed polariton fraction, which shows a gradual decay with increasing temperature, and obtain the critical temperature for the BoseEinstein -like condensate (BEC) phase transition. We tentatively compare our experimental findings with theoretical models, developed for atomic conden sates,to describe the condensates' coherence fading with temperature.