Decay of a superfluid current of ultra-cold atoms in a toroidal trap
arXiv:1207.0501 · doi:10.1103/PhysRevA.90.023604
Abstract
Using a numerical implementation of the truncated Wigner approximation, we simulate the experiment reported by Ramanathan et al. in Phys. Rev. Lett. 106, 130401 (2011), in which a Bose-Einstein condensate is created in a toroidal trap and set into rotation via a phase imprinting technique. A potential barrier is then placed in the trap to study the decay of the superflow. We find that the current decays via thermally activated phase slips, which can also be visualized as vortices crossing the barrier region in the radial direction. Adopting the notion of critical velocity used in the experiment, we determine it to be lower than the local speed of sound at the barrier, in contradiction to the predictions of the zero-temperature Gross-Pitaevskii equation. We map out the superfluid decay rate and critical velocity as a function of temperature and observe a strong dependence. Thermal fluctuations offer a partial explanation of the experimentally observed reduction of the critical velocity from the phonon velocity.
15 pages. 11 figures
References in corpus (13)
- Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
- Dynamics and statistical mechanics of ultra-cold Bose gases using c-field techniques
- Extension of Bogoliubov theory to quasi-condensates
- Superfluid behaviour of a two-dimensional Bose gas
- A large magnetic storage ring for Bose-Einstein condensates
- Cold atom confinement in an all-optical dark ring trap
- Evolution of the macroscopically entangled states in optical lattices
- Effect of quantum fluctuations on the dipolar motion of Bose-Einstein condensates in optical lattices
- Critical Rotation of an Annular Superfluid Bose Gas
- Critical velocity of superfluid flow through single barrier and periodic potentials
- Critical velocity for a toroidal Bose-Einstein condensate flowing through a barrier
- Dynamical instabilities of Bose-Einstein condensates at the band-edge in one-dimensional optical lattices
- Decay of super-currents in condensates in optical lattices
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