Our paper on the  photoluminescence of the negative branch of exciton-polariton condensates was published today in Phys. Rev. B.  For strongly excited polariton condensates you get a weird effect where you not only see the regular energy momentum dispersion E=k^2, but a flipped version E=-k^2.  This occurs because of the peculiar effects of Bogoliubov theory originating from non-linear interactions between the polaritons.  Good news on this leap year day!

This is some artwork inspired by the work. Enjoy!

 

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