Negative Bogoliubov dispersion paper published in Phys. Rev. B
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!