Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate
S. B. Papp, J. M. Pino, R. J. Wild, S. Ronen, C. E. Wieman, D. S. Jin,, and E. A. Cornell
TL;DR
This paper uses Bragg spectroscopy to explore the excitation spectrum of a strongly interacting 85Rb Bose-Einstein condensate, revealing significant beyond mean-field effects due to tunable interactions via a Feshbach resonance.
Contribution
It demonstrates the first experimental observation of beyond mean-field effects in a gaseous BEC using Bragg spectroscopy with tunable interactions.
Findings
Observation of quantum depletion effects
Detection of beyond mean-field corrections
Confirmation of theoretical predictions
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.
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