Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates

Details Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates

2003-03-07

arxiv.org/abs/cond-mat/0303137v1

Phys. Rev. Lett. 91, 010405 (2003)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures; submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.010405

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 quasi-condensate theory. In addition, we observe a condensate length consistent with the absence of density fluctuations, even when phase fluctuations are large.

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