Nature of spinor Bose-Einstein condensates in rubidium
Nature of spinor Bose-Einstein condensates in rubidium
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DOI：
10.1103/physreva.64.053602
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发表时间：
2001-11-01
影响因子：
2.9
通讯作者：
Greene, CH
中科院分区：
文献类型：
--
作者：
Klausen, NN;Bohn, JL;Greene, CH
我们对铷同位素 Rb-85 和 Rb-87 进行了详细的紧耦合计算，以确定其旋量玻色-爱因斯坦凝聚态的性质。这些计算预测自旋 1 玻色子 Rb-87 的自旋凝聚态具有铁磁性。自旋 2 玻色子 Rb-85 和 Rb-87 的旋量凝聚。然而，预计两者都是极地的。自旋 1 凝聚体的性质关键取决于总自旋 0 和 2 的 s 波散射长度之间的差异的符号，而自旋 2 凝聚体的性质取决于总自旋 0、2 和 4 的 s 波散射长度之间的差异值。这些散射长度是先前提取的，并且发现对于所有三种情况都具有重叠的不确定性，因此使自旋凝聚体的性质不明确。本研究基于 Roberts 等人的实验工作最近改进的结果，利用了对散射长度的精确不确定性分析，这使我们能够提取基态旋量凝聚的性质的明确结果。
We perform detailed close-coupling calculations for the rubidium isotopes Rb-85 and Rb-87 to ascertain the nature of their spinor Bose-Einstein condensates. These calculations predict that the spinor condensate for the spin-1 boson Rb-87 has a ferromagnetic nature. The spinor condensates for the spin-2 bosons Rb-85 and Rb-87. however, are both predicted to be polar. The nature of a spin-1 condensate hinges critically on the sign of the difference between the s-wave scattering lengths for total spins 0 and 2 while the nature of a spin-2 condensate depends on the values of the differences between s-wave scattering lengths for the total spins 0, 2, and 4. These scattering lengths were extracted previously and found to have overlapping uncertainties for all three cases, thus leaving the nature of the spinor condensates ambiguous. The present study exploits a refined uncertainty analysis of the scattering lengths based on recently improved result from experimental work by Roberts et at.. which permits us to extract an unambiguous result for the nature of the ground state spinor condensates.