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arXiv 1406.3453cond-mat.quant-gas
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偶极凝聚的数涨落:各向异性和热力学状态的缓慢接近

Number Fluctuations of a Dipolar Condensate: Anisotropy and Slow Approach to the Thermodynamic Regime

D. Baillie, R. N. Bisset, C. Ticknor, P. B. Blakie

摘要:

本文提出了一个用有限分辨单元测量的准二维偶极玻色-爱因斯坦凝聚体的数涨落理论。我们表明,当偶极子倾斜有一个组件平行于平面的陷阱,数量波动变得各向异性,即依赖于测量单元的面内取向。我们开发的量子和热波动适用于在实验中访问的细胞大小的分析结果。我们发现,随着细胞尺寸的增加,热力学波动的结果是接近更慢,比在冷凝物与短程相互作用,所以实验将不需要高数值孔径成像观察预测的效果。

英文摘要:

We present a theory for the number fluctuations of a quasi-two-dimensional (quasi-2D) dipolar Bose-Einstein condensate measured with finite resolution cells. We show that when the dipoles are tilted to have a component parallel to the plane of the trap, the number fluctuations become anisotropic, i.e. depend on the in-plane orientation of the measurement cell. We develop analytic results for the quantum and thermal fluctuations applicable to the cell sizes accessible in experiments. We show that as cell size is increased the thermodynamic fluctuation result is approached much more slowly than in condensates with short range interactions, so experiments would not require high numerical aperture imaging to observe the predicted effect.

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