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arXiv 1409.3149cond-mat.quant-gas
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自旋-轨道耦合玻色-爱因斯坦超流体中可见稳定条纹的制备方法

Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid

Giovanni I. Martone, Yun Li, Sandro Stringari

摘要:

具有自旋-轨道耦合的自旋- $1/2$玻色-爱因斯坦凝聚体的条纹相的特征在于两个连续对称性的自发破缺:规范对称性和平移对称性。这是超固体的一个特殊特征,是相互作用的结果。我们提出了一种方法来产生条纹配置与高对比度的条纹,使其在原子气体中的实验检测一个现实的角度来看。我们的方法,其效率是直接确认的三维Gross-Pitaevskii模拟,是基于空间分离的两个自旋组件成一个二维双层配置,导致减少的有效种间相互作用和条纹相的稳定性的增加。我们还探讨了一个$π/2$布拉格脉冲的效果,导致条纹波长的增加,和一个$π/2$射频脉冲,揭示了自旋通道中的序参量的相干性。

英文摘要:

The striped phase exhibited by a spin-$1/2$ Bose-Einstein condensate with spin-orbit coupling is characterized by the spontaneous breaking of two continuous symmetries: gauge and translational symmetry. This is a peculiar feature of supersolids and is the consequence of interaction effects. We propose an approach to produce striped configurations with high-contrast fringes, making their experimental detection in atomic gases a realistic perspective. Our approach, whose efficiency is directly confirmed by three-dimensional Gross-Pitaevskii simulations, is based on the space separation of the two spin components into a two-dimensional bilayer configuration, causing the reduction of the effective interspecies interaction and the increase of the stability of the striped phase. We also explore the effect of a $π/2$ Bragg pulse, causing the increase of the fringe wavelength, and of a $π/2$ rf pulse, revealing the coherent nature of the order parameter in the spin channel.

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