https://doi.org/10.1140/epjd/e2003-00204-8
Castaing's instability in a trapped ultra-cold gas
Laboratoire Kastler Brossel, Département de Physique de
l'ENS, 24 rue Lhomond, 75005 Paris, France
Corresponding authors: a fuchs@lkb.ens.fr - b olivier.prevote@voila.fr - c gangardt@lkb.ens.fr
Received:
1
October
2002
Published online:
15
July
2003
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 the experiment at JILA [1]. 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.
PACS: 03.75.Nt – Other Bose-Einstein condensation phenomena / 51.10.+y – Kinetic and transport theory of gases / 75.30.Ds – Spin waves
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
