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WHEN IS A QUANTUM GAS A QUANTUM LIQUID?

    https://doi.org/10.1142/9789814273008_0003Cited by:0 (Source: Crossref)
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    Abstract:

    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.