Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.150402
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Funding
- French ANR
- IFRAF institute
- Euroquam Project CIGMA
- European Union [MEIF-CT-2006-041390]
- Polish Government
- Australian Research Council
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We investigate the atom-optical analog of degenerate four-wave mixing by colliding two Bose-Einstein condensates of metastable helium. The momentum distribution of the scattered atoms is measured in three dimensions. A simple analogy with photon phase matching conditions suggests a spherical final distribution. We find, however, that it is an ellipsoid with radii smaller than the initial collision momenta. Numerical and analytical calculations agree with this and reveal the interplay between many-body effects, mean-field interaction, and the anisotropy of the source condensate.
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