Damping of bulk excitations over an elongated BEC - the role of radial modes

Abstract

We report the measurement of Beliaev damping of bulk excitations in cigar shaped Bose Einstein condensates of atomic vapor. By using post selection, excitation line shapes of the total population are compared with those of the undamped excitations. We find that the damping depends on the initial excitation energy of the decaying quasi particle, as well as on the excitation momentum. We model the condensate as an infinite cylinder and calculate the damping rates of the different radial modes. The derived damping rates are in good agreement with the experimentally measured ones. The damping rates strongly depend on the destructive interference between pathways for damping, due to the quantum many-body nature of both excitation and damping products.

5 pages, 4 figures

References in corpus (8)

• Quadrupole Oscillation of a Single-Vortex Condensate: Evidence for Kelvin Modes
• Beliaev damping of quasi-particles in a Bose-Einstein condensate
• Bragg spectroscopy of the multi-branch Bogoliubov spectrum of elongated Bose-Einstein condensates
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• Landau damping in trapped Bose-condensed gases
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