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

Tercas, H. and Mendonca, J.T. and Robb, G.R.M. (2009) Two-stream instability in quasi-one-dimensional Bose-Einstein condensates. Physical Review A, 79 (6). ISSN 1094-1622

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Abstract

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.