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arXiv 1507.02552cond-mat.quant-gasnlin.PS
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玻色-爱因斯坦凝聚体中自局域杂质亮孤子的自发形成

Spontaneous formation of bright solitons in self-localized impurities in Bose-Einstein condensate

Abdelaali Boudjemaa

摘要:

利用含时Hartree-Fock-Bogoliubov理论研究了玻色-爱因斯坦凝聚体(BEC)-杂质混合物中杂质组分中亮孤子的形成.虽然我们假设玻色子-玻色子和杂质-玻色子相互作用是有效排斥的,但它们的性质可以在强反常相关的存在下自发地从排斥变为吸引。在这样一个制度的杂质成分成为一个系统的有效吸引原子自动导致产生明亮的孤子。我们发现,由于杂质-宿主和宿主-宿主相互作用引起的耗散,该孤子在较高温度下衰减。我们发现,在突然增加的杂质玻色子强度的训练的明亮的孤子产生,这可以解释的调制不稳定性(MI)的含时杂质波函数。

英文摘要:

We study the formation of bright solitons in the impurity component of Bose-Einstein condensate (BEC)-impurity mixture by using the time-dependent Hartree-Fock-Bogoliubov theory. While we assume the boson-boson and impurity-boson interactions to be effectively repulsive, their character can be changed spontaneously from repulsive to attractive in the presence of strong anomalous correlations. In such a regime the impurity component becomes a system of effectively attractive atoms leading automatically to the generation of bright solitons. We find that this soliton decays at higher temperatures due to the dissipation induced by the impurity-host and host-host interactions. We show that after a sudden increase of the impurity-boson strength a train of bright solitons is produced and this can be interpreted in terms of the modulational instability (MI) of the time-dependent impurity wave function.

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