Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates
arXiv:cond-mat/0303137 · doi:10.1103/PhysRevLett.91.010405
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 quasi-condensate theory. In addition, we observe a condensate length consistent with the absence of density fluctuations, even when phase fluctuations are large.
4 pages, 3 figures; submitted to Phys. Rev. Lett