I came across this article that claims to a have a B.E condensate of exciton polariton in 2D. However, the authors also seem to admit that is a different kind of phase transition different from a traditional BEC and called Kosterlitz-Thouless superfluid (KTS) transition. But the condensate properties of this are similar to that of atomic BEC. A special condition for this KTS was requirement of a potential trap which in context of paper was local minima provided by disordered potential well. So I was wondering in this context that: Are trap really required for a 3D BEC ??

The discussed paper is from J. Kasprzak et al., Nature 443, 409 (2006). https://www.nature.com/articles/nature05131

Here is a piece from the supplementary information of the paper that discusses about KT.

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  • $\begingroup$ KT transition has nothing to do with trap. Rather, it is because the system is (classical) 2D. The finite temperature superfluid transition is of KT type in 2D. $\endgroup$
    – Meng Cheng
    Sep 15, 2022 at 3:33
  • $\begingroup$ Where, in that paper, do they mention KT? $\endgroup$
    – SuperCiocia
    Sep 15, 2022 at 3:34
  • $\begingroup$ @SuperCiocia They have mentioned that in the supplementary information. $\endgroup$
    – AdShil00
    Sep 15, 2022 at 3:40


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