Correlations in a BEC collision: First-principles quantum dynamics with 150 000 atoms

Details Correlations in a BEC collision: First-principles quantum dynamics with 150 000 atoms Correlations in a BEC collision: First-principles quantum dynamics with 150 000 atoms

2006-07-31

arxiv.org/abs/cond-mat/0607831v2

Phys. Rev. Lett. 98, 120402 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures. v2: Rewording and style changes, minor except for rewrite of background on the positive-P representation.

Scientific paper

The quantum dynamics of colliding Bose-Einstein condensates with 150 000 atoms are simulated directly from the Hamiltonian using the stochastic positive-P method. Two-body correlations between the scattered atoms and their velocity distribution are found for experimentally accessible parameters. Hanbury Brown-Twiss or thermal-like correlations are seen for copropagating atoms, while number correlations for counterpropagating atoms are even stronger than thermal correlations at short times. The coherent phase grains grow in size as the collision progresses with the onset of growth coinciding with the beginning of stimulated scattering. The method is versatile and usable for a range of cold atom systems.

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