Two-stream instability in quasi-one-dimensional Bose-Einstein condensates

Details Two-stream instability in quasi-one-dimensional Bose-Einstein condensates Two-stream instability in quasi-one-dimensional Bose-Einstein condensates

2009-11-25

arxiv.org/abs/0911.4906v1

Phys. Rev. A 79, 065601 (2009)

Physics

Condensed Matter

Quantum Gases

4 pages

Scientific paper

We apply a kinetic model to predict the existence of an instability mechanism in elongated Bose-Einstein condensates. Our kinetic description, based on the Wigner formalism, is employed to highlight the existence of unstable Bogoliubov waves that may be excited in the counterpropagation configuration. We identify a dimensionless parameter, the Mach number at T = 0, that tunes different regimes of stability. We also estimate the magnitude of the main parameters at which two-stream instability is expected to be observed under typical experimental conditions.

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