Document Type

Article

Publication Date

Fall 9-22-2008

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

101

Issue

13

First Page

135301-1

Last Page

135301-4

DOI

10.1103/PhysRevLett.101.135301

Abstract

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.

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