Experimental observation of Beliaev coupling in a Bose-Einstein condensate.

  title={Experimental observation of Beliaev coupling in a Bose-Einstein condensate.},
  author={E. Hodby and O. Marag{\`o} and G. Hechenblaikner and C. Foot},
  journal={Physical review letters},
  volume={86 11},
We report the first experimental observation of Beliaev coupling between collective excitations of a Bose-Einstein condensed gas. Beliaev coupling is not predicted by the Gross-Pitaevskii equation and so this experiment tests condensate theory beyond the mean field approximation. Measurements of the amplitude of a high frequency scissors mode show that the Beliaev process transfers energy to a lower-lying mode and then back and forth between these modes, unlike Landau processes which lead to a… Expand
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