Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate

Details Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate

2008-05-02

arxiv.org/abs/0805.0295v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.135301

We report on measurements of the excitation spectrum of a strongly interacting Bose-Einstein condensate (BEC). A magnetic-field Feshbach resonance is used to tune atom-atom interactions in the condensate and to reach a regime where quantum depletion and beyond mean-field corrections to the condensate chemical potential are significant. We use two-photon Bragg spectroscopy to probe the condensate excitation spectrum; our results demonstrate the onset of beyond mean-field effects in a gaseous BEC.

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