Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion

Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion
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超冷玻色气体的量子临界区在自由膨胀后表现出普遍的密度概率分布

DOI:
10.1088/1367-2630/17/6/063015
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发表时间:
2015-06
影响因子:
3.3
通讯作者:
Lu, Baolong
Lu, Baolong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sun, Chao;Xiong, Dezhi;Xiong, Hongwei;Lu, Baolong

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我们报道了一维光学晶格中超冷量子临界玻色气体的普遍行为。我们提取的密度概率分布从测量后的自由膨胀时间的铷玻色气体的原子密度。密度概率被发现遵循一个简单的指数规律,一旦晶格系统已进入QC区域以上的Berezinskiii-Kosterlitz无相变。我们发现,除了不同晶格威尔斯中的次凝聚体之间的相对相位涨落外,在该QC区域内的单个晶格威尔斯中也存在空间相位涨落。普遍的密度概率分布,因此可以很好地理解一个简单的理论模型,考虑到这两种相位波动。
We report the observation of a universal behavior of ultracold quantum critical (QC) Bose gases trapped in a one-dimensional optical lattice. We extract the density probability distributions from the measured atomic density of the rubidium Bose gases after a free expansion time. The density probability is found to follow a simple exponential law once the lattice system has entered the QC region above the Berezinskii–Kosterlitz–Thouless transition. We show that, in addition to relative phase fluctuations between the subcondensates in different lattice wells, there also exist spatial phase fluctuations within single lattice wells in this QC region. The universal density-probability distribution can thus be well understood by a simple theoretical model taking into account these two kinds of phase fluctuations.
限制在组合陷阱中的玻色气体到玻色-爱因斯坦凝聚的相变
DOI: 10.1103/physreva.82.053629
发表时间: 2010-11
期刊: Physical Review A
影响因子: 2.9
作者:
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影响因子: --
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