Cavity-controlled collective scattering at the recoil limit.

@article{Bux2011CavitycontrolledCS,
  title={Cavity-controlled collective scattering at the recoil limit.},
  author={Simone Bux and Christine Gnahm and Reinhardt A. W. Maier and Claus Zimmermann and Philippe Wilhelm Courteille},
  journal={Physical review letters},
  year={2011},
  volume={106 20},
  pages={
          203601
        }
}
We study collective scattering with Bose-Einstein condensates interacting with a high-finesse ring cavity. The condensate scatters the light of a transverse pump beam superradiantly into modes which, in contrast to previous experiments, are not determined by the geometrical shape of the condensate, but specified by a resonant cavity mode. Moreover, since the recoil-shifted frequency of the scattered light depends on the initial momentum of the scattered fraction of the condensate, we show that… 
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TLDR
An atom-cavity system is reported, combining a Purcell factor above 40 with a cavity bandwidth below the recoil frequency associated with the kinetic energy transfer in a single photon scattering event, which lets us access a yet-unexplored regime of atom- cavity interactions, in which the atomic motion can be manipulated by targeted dissipation with sub-recoil resolution.
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