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arXiv 1111.5248cond-mat.quant-gas
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无序势中的暗孤子

Dark soliton in a disorder potential

Małgorzata Mochol, Marcin Płodzień, Krzysztof Sacha

摘要:

研究了弱无序势下玻色-爱因斯坦凝聚体中的暗孤子。变形的孤子形状内的Bogoliubov方法和采用扩展的本征态的Pöschl-Teller哈密顿量进行了分析。与数值模拟结果的比较表明,线性响应分析揭示了良好的协议,即使无序的强度是系统的化学势的顺序。在论文的第二部分中,我们着重讨论了暗孤子的量子性质,并证明了在存在无序的情况下,暗孤子可以表现出安德森局域化。由于无序引起的准粒子激发,安德森局域孤子可能会衰减。然而,我们表明,相应的寿命是远远长于在一个典型的实验中的冷凝寿命。

英文摘要:

We consider dark soliton in a Bose-Einstein condensate in the presence of a weak disorder potential. Deformation of the soliton shape is analyzed within the Bogoliubov approach and by employing expansion in eigenstates of the Pöschl-Teller Hamiltonian. Comparison of the results with the numerical simulations indicates that the linear response analysis reveals good agreement even if the strength of the disorder is of the order of the chemical potential of the system. In the second part of the paper we concentrate on quantum nature of the dark soliton and demonstrate that the soliton may reveal Anderson localization in the presence of a disorder. The Anderson localized soliton may decay due to quasi-particle excitations induced by the disorder. However, we show that the corresponding lifetime is much longer than condensate lifetime in a typical experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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