Dynamical instability of a condensate induced by a rotating thermal gas

Details Dynamical instability of a condensate induced by a rotating thermal gas Dynamical instability of a condensate induced by a rotating thermal gas

2001-09-10

arxiv.org/abs/cond-mat/0109172v1

Physics

Condensed Matter

4 pages, no figures

Scientific paper

10.1103/PhysRevLett.88.070401

We study surface modes of the condensate in the presence of a rotating thermal cloud in an axisymmetric trap. By considering collisions that transfer atoms between the condensate and noncondensate, we find that modes which rotate in the same sense as the thermal cloud damp less strongly than counter-rotating modes. We show that above a critical angular rotation frequency, equivalent to the Landau stability criterion, the co-rotating mode becomes dynamically unstable, leading to the possibility of vortex nucleation. This kind of mechanism is proposed as a natural explanation for the formation of vortices observed recently in the experiment of Haljan \emph{et al} {[}P. C. Haljan \emph{et al.}, cond-mat/0106362{]}. We also generalize our stability analysis to treat the case where the stationary state of the condensate already possesses a single vortex.

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