Physicists confirm existence of polariton condensate (May 17)
http://physicsweb.org/article/news/11/5/17

Physicists in the US say they have witnessed the trademark coherence of
a Bose-Einstein condensate in a cooled system of quasiparticles known
as
"polaritons". Although similar claims have been made before, other
researchers in the field had suspected that the coherence was an effect
of the laser beam used to create the polaritons, meaning the systems
were not true condensates. This new experiment has removed doubt by
accumulating polaritons away from the laser beam (Science 316 1007).