Impact of photo-assisted collisions on superradiant light scattering   with Bose condensates
  We present experimental evidence supporting the postulation that the secondary effects of light-assisted collisions are the main reason that the superradiant light scattering efficiency in condensates is asymmetric with respect to the sign of the pump-laser detuning. Contrary to the recent experimental study, however, we observe severe and comparable heating with all three pump-laser polarizations. We also perform two-color, double-pulse measurements to directly study the degradation of condensate coherence and the resulting impact on the superradiant scattering efficiency. 
Xinyu Luo (Institute of Physics, Chinese Academy of Sciences, Beijing,   China), Kuiyi Gao (Institute of Physics, Chinese Ac...
cond-mat.quant-gas physics.atom-ph quant-ph