Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-07-05
Physics
Condensed Matter
Other Condensed Matter
5 pages, 4 figures
Scientific paper
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.
Bar-Gill Nir
Davidson Nir
Pugatch Rami
Rowen Eitan E.
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