玻色-爱因斯坦凝聚体中一维相位涨落的动量谱学
Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates.
作者信息
Richard S, Gerbier F, Thywissen J H, Hugbart M, Bouyer P, Aspect A
机构信息
Laboratoire Charles Fabry de l'Institut d'Optique, UMR 8501 du CNRS, 91403 Orsay Cedex, France.
出版信息
Phys Rev Lett. 2003 Jul 4;91(1):010405. doi: 10.1103/PhysRevLett.91.010405. Epub 2003 Jul 3.
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.
我们使用布拉格光谱法测量了长宽比为152的玻色-爱因斯坦凝聚体的轴向动量分布。我们观察到了一维相位涨落所特有的洛伦兹动量分布特征。这种分布宽度的温度依赖性为准凝聚体理论提供了定量检验。此外，即使相位涨落很大，我们也观察到了与密度涨落抑制相一致的凝聚体长度。
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