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摘要翻译：
本文讨论了超冷玻色气体在非均匀光学晶格中玻色-爱因斯坦凝聚(BEC)跃迁的几个可能的实验特征。基于常用的飞行时间成像技术，我们发现第一布里渊区的动量-空间密度分布，加上干涉图的可见性，提供了关于系统的有价值的信息。特别是，通过越过BEC转变温度，出现一个清晰的双峰结构，确定了这一相变的定性和普遍特征。此外，动量分布还可以用于提取凝析油馏分，这可能是一个有前途的温度计在这样的系统中。
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英文标题：
《Characteristics of Bose-Einstein condensation in an optical lattice》
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作者：
G.-D. Lin, Wei Zhang, and L.-M. Duan
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最新提交年份：
2008
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分类信息：
一级分类：Physics 物理学
二级分类：Superconductivity 超导电性
分类描述：Superconductivity: theory, models, experiment. Superflow in helium
超导：理论，模型，实验。氦中超流
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
We discuss several possible experimental signatures of the Bose-Einstein condensation (BEC) transition for an ultracold Bose gas in an inhomogeneous optical lattice. Based on the commonly used time-of-flight imaging technique, we show that the momentum-space density profile in the first Brillouin zone, supplemented by the visibility of interference patterns, provides valuable information about the system. In particular, by crossing the BEC transition temperature, the appearance of a clear bimodal structure sets a qualitative and universal signature of this phase transition. Furthermore, the momentum distribution can also be applied to extract the condensate fraction, which may serve as a promising thermometer in such a system.
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PDF链接：
https://arxiv.org/pdf/802.07
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