Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates |
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Authors: | Richard S Gerbier F Thywissen J H Hugbart M Bouyer P Aspect A |
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Institution: | Laboratoire Charles Fabry de l'Institut d'Optique, UMR 8501 du CNRS, 91403 Orsay Cedex, France. |
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Abstract: | We measure the axial momentum distribution of Bose-Einstein condensates with an aspect ratio of 152 using Bragg spectroscopy. We observe the Lorentzian momentum distribution characteristic of one-dimensional phase fluctuations. The temperature dependence of the width of this distribution provides a quantitative test of quasicondensate theory. In addition, we observe a condensate length consistent with the suppression of density fluctuations, even when phase fluctuations are large. |
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