Correlations in a BEC collision: first-principles quantum dynamics with 150000 atoms

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Title: Correlations in a BEC collision: first-principles quantum dynamics with 150000 atoms
Author(s): Deuar, P.; Drummond, P. D.
Abstract: The quantum dynamics of colliding Bose-Einstein condensates with 150000 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.
Publication type: Journal article
Source: Physical Review Letters, Vol. 98, no. 12 (2007), article no. 120402
Publication year: 2007
FOR Code(s): 02 Physical Sciences
Keyword(s): Bose-Einstein condensation; Grain growth; Grain size and shape; Hamiltonians; High energy physics; Molecular dynamics; Number correlations; Random processes; Stimulated scattering; Thermal like correlations; Two body correlations; Velocity distribution
Publisher: American Physical Society
ISSN: 0031-9007
Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.98.120402
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