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arXiv 0807.4980cond-mat.other
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双组分玻色-爱因斯坦凝聚体生长过程中的动力学斑图形成

Dynamical pattern formation during growth of a dual-species Bose-Einstein condensate

Shai Ronen, John L. Bohn, Laura E. Halmo, Mark Edwards

摘要:

我们用Gross-Pitaevskii方程模拟了双组分玻色-爱因斯坦凝聚体的增长,并在此基础上增加了一个增益项。这种生长发生在两种气体的混合物的同时蒸发冷却期间。双冷凝物的基态通常是可混溶的混合物,或者是具有两种空间分离组分的不混溶相。在雪茄阱中,基态通常由中心的一个组分和其两侧的另一个组分组成.模拟结果表明,当在雪茄阱中形成冷凝物并使混合物发生相分离时,生长结束时的最终态通常远离系统的真实基态.相反,它由两个物种的多个交错的气泡组成。最近在JILA的Wieman小组的实验中观察到了这样的模式,我们的模拟与实验定性一致。我们解释的斑图形成,由于调制不稳定性的发病过程中的增长,并研究了系统的各种参数的最终状态图案的依赖性。

英文摘要:

We simulate the growth of a dual species Bose-Einstein condensate using a Gross-Pitaevskii equation with an additional gain term giving rise to the growth. Such growth occurs during simultaneous evaporative cooling of a mixture of two gases. The ground state of a dual condensate is normally either a miscible mixture, or an immiscible phase with two spatially separated components. In a cigar trap the ground state typically consists of one component in the center, and the other component flanking it. Our simulations show that when the condensates are formed in a cigar trap and the mixture is phase separated, then the final state upon the end of the growth is generally far from the true ground state of the system. Instead it consists of multiple, interleaved bubbles of the two species. Such a pattern was observed recently in an experiment by Wieman's group at JILA, and our simulations are in good qualitative agreement with the experiment. We explain the pattern formation as due to the onset of modulation instability during growth, and study the dependence of the final state pattern on various parameters of the system.

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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