Phys. Rev. Lett. 101, 135301 (2008) [4 pages]
Bragg Spectroscopy of a Strongly Interacting 85Rb Bose-Einstein Condensate
Abstract
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Citing Articles
S. B. Papp, 1 J. M. Pino, 1 R. J. Wild, 1 S. Ronen, 1 C. E. Wieman, 2,1 D. S. Jin, 1 and E. A. Cornell11JILA, Quantum Physics Division, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA
2University of British Colombia, Vancouver, British Columbia V6T 1Z1, Canada
Received 9 April 2008; revised 8 August 2008; published 22 September 2008
We report on measurements of the excitation spectrum of a strongly interacting Bose-Einstein condensate. 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 Bose-Einstein condensate.
©2008 The American Physical Society
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