Elastic scattering losses from colliding BEC's

Details Elastic scattering losses from colliding BEC's Elastic scattering losses from colliding BEC's

2005-12-05

arxiv.org/abs/cond-mat/0512082v1

Physics

Condensed Matter

Other Condensed Matter

10 pages, 9 figures

Scientific paper

Bragg diffraction divides a Bose-Einstein condensate into two overlapping components, moving with respect to each other with high momentum. Elastic collisions between atoms from distinct wave packets can significantly deplete the condensate. Recently Zi\'{n} {\it et al.} (Phys. Rev. Lett. {\bf 94}, 200401 (2005)) have introduced a model of two counter-propagating atomic Gaussian wavepackets incorporating dynamics of the incoherent scattering processes. Here we study the properties of this model in detail, including the nature of the transition from spontaneous to stimulated scattering. Within the first order approximation we derive analytical expressions for the density matrix and anomalous density which provides excellent insight into correlation properties of scattered atoms.

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