Self-trapping of impurities in Bose-Einstein condensates: Strong attractive and repulsive coupling
Self-trapping of impurities in Bose-Einstein condensates: Strong attractive and repulsive coupling
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DOI：
10.1209/0295-5075/82/30004
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发表时间：
2008-05-01
期刊：
影响因子：
1.8
通讯作者：
Jaksch, D.
中科院分区：
文献类型：
--
作者：
Bruderer, M.;Bao, W.;Jaksch, D.
我们研究了中性杂质原子浸入均匀玻色-爱因斯坦凝聚体（BEC）中的相互作用诱导的局域化——所谓的自俘获。基于Hartree对BEC的描述，我们表明，与排斥性杂质不同，吸引性杂质在3d中具有奇异基态，当耦合接近临界值β（星形）时，在2d中收缩为点状状态。此外，我们发现在一维和二维中，在吸引杂质附近，BEC的密度显著增加，这强烈地增强了BEC中原子之间的非弹性碰撞。这些碰撞导致BEC原子的损失，也可能导致局域杂质本身的损失。版权所有中国人民解放军，2008。
We study the interaction-induced localization - the so-called self-trapping - of a neutral impurity atom immersed in a homogeneous Bose-Einstein condensate (BEC). Based on a Hartree description of the BEC we show that - unlike repulsive impurities - attractive impurities have a singular ground state in 3d and shrink to a point-like state in 2d as the coupling approaches a critical value beta(star). Moreover, we find that the density of the BEC increases markedly in the vicinity of attractive impurities in 1d and 2d, which strongly enhances inelastic collisions between atoms in the BEC. These collisions result in a loss of BEC atoms and possibly of the localized impurity itself. Copyright (c) EPLA, 2008.