Subdiffusive spreading of a Bose-Einstein condensate in random potentials

Subdiffusive spreading of a Bose-Einstein condensate in random potentials
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玻色-爱因斯坦凝聚体在随机势中的次扩散扩散

DOI:
10.1103/physreva.86.053612
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发表时间:
2012-11
期刊:
影响因子:
2.9
通讯作者:
Weizhu Bao
Weizhu Bao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bin Min;Tiejun Li;M. Rosenkrantz;Weizhu Bao

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我们数值研究了一维玻色-爱因斯坦凝聚体在散斑或杂质无序势中的长时间动力学。使用平均场Gross-Pitaevskii方程,我们证明了冷凝物的亚扩散很长一段时间。我们发现,正常模式之间的相互作用辅助跳跃导致这种次扩散。提供了在实验中均方根(rms)宽度饱和的可能(部分)原因[Nature(伦敦)453,891(2008)]。我们认为,观察参与长度和均方根宽度的凝聚体,而不仅仅是均方根宽度,可以提供一个更完整的描述的长期行为的超冷原子在无序势。我们的研究证实了空间连续无序相互作用模型中的亚扩散,并突出了空间离散模型不具备的新功能。
We study numerically the long-time dynamics of a one-dimensional Bose-Einstein condensate expanding in a speckle or impurity disorder potential. Using the mean-field Gross-Pitaevskii equation, we demonstrate subdiffusive spreading of the condensate for long times. We find that interaction-assisted hopping between normal modes leads to this subdiffusion. A possible (partial) reason why the root-mean-square (rms) width saturates in the experiment [Nature (London) 453, 891 (2008)] is provided. We suggest that observing both the participation length and the rms width of a condensate, rather than only the rms width, could provide a more complete description of the long-time behavior of ultracold atoms in disorder potentials. Our study confirms subdiffusive spreading in spatially continuous disordered interacting models and highlights new features which spatially discrete models do not possess.
DOI: 10.1007/978-3-642-15942-8_15
发表时间: 2011
期刊: --
影响因子: --
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