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  • Title: Dynamical instability of a condensate induced by a rotating thermal gas.
    Author: Williams JE, Zaremba E, Jackson B, Nikuni T, Griffin A.
    Journal: Phys Rev Lett; 2002 Feb 18; 88(7):070401. PubMed ID: 11863869.
    Abstract:
    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 the noncondensate, we find that m>0 modes, which rotate in the same sense as the thermal cloud, damp less strongly than m<0 modes, where m is the polarity of the excitation. We show that above a critical angular rotation frequency, equivalent to the Landau stability criterion, m>0 modes become dynamically unstable, leading to the possibility of vortex nucleation. 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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