Experimental study demonstrates high-resolution Bragg spectroscopy of a Bose-Einstein condensate, revealing full spatial coherence and establishing a probe for dynamic structure factors.
Properties of a Bose-Einstein condensate were studied by stimulated, two-photon Bragg scattering. The high momentum and energy resolution of this method allowed a spectroscopic measurement of the mean-field energy and of the intrinsic momentum uncertainty of the condensate. The coherence length of the condensate was shown to be equal to its size. Bragg spectroscopy can be used to determine the dynamic structure factor over a wide range of energy and momentum transfers.
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Stenger et al. (1999) studied this question.
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