Castaing's instability in a trapped ultra-cold gas

Details Castaing's instability in a trapped ultra-cold gas Castaing's instability in a trapped ultra-cold gas

2002-09-21

arxiv.org/abs/cond-mat/0209506v2

Eur. Phys. J. D 25, 167-171 (2003)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures; equation (8) corrected; submitted to EPJ D

Scientific paper

10.1140/epjd/e2003-00204-8

We consider a trapped ultra-cold gas of (non-condensed) bosons with two internal states (described by a pseudo spin) and study the stability of a longitudinal pseudo spin polarization gradient. For this purpose, we numerically solve a kinetic equation corresponding to a situation close to an experiment at JILA. It shows the presence of Castaing's instability of transverse spin polarization fluctuations at long wavelengths. This phenomenon could be used to create spontaneous transverse spin waves.

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