期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.150402
关键词
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资金
- French ANR
- IFRAF institute
- Euroquam Project CIGMA
- European Union [MEIF-CT-2006-041390]
- Polish Government
- Australian Research Council
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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