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

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.

4 pages, 3 figures

References in corpus (2)

• Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
• Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas

Cited by in corpus (3)

• Bragg spectroscopy of a strongly interacting Fermi gas
• Ground State Properties of Cold Bosonic Atoms At Large Scattering Lengths
• Quantum fluctuations in trapped time-dependent Bose-Einstein condensates