Excitation of phonons in a Bose-Einstein condensate by light scattering

Details Excitation of phonons in a Bose-Einstein condensate by light scattering Excitation of phonons in a Bose-Einstein condensate by light scattering

1999-06-03

arxiv.org/abs/cond-mat/9906035v2

Physics

Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.83.2876

Stimulated small-angle light scattering was used to measure the structure factor of a Bose-Einstein condensate in the phonon regime. The excitation strength for phonons was found to be significantly reduced from that of free particles, revealing the presence of correlated pair excitations and quantum depletion in the condensate. The Bragg resonance line strength and line shift agreed with predictions of a local density approximation.

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