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arXiv 1202.1689cond-mat.quant-gascond-mat.other
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偶极玻色-爱因斯坦凝聚体中二维亮孤子的产生

Creating two-dimensional bright solitons in dipolar Bose-Einstein condensates

Patrick Köberle, Damir Zajec, Günter Wunner, Boris Malomed

摘要:

我们提出了一个在偶极玻色-爱因斯坦凝聚体(BECs)中产生准二维(2D)亮孤子的实验装置,该装置的存在已在Phys. Rev. Lett. 100,090406(2008)中所述。预期孤子的一个具有挑战性的特点是其强大的固有各向异性,由于偶极气体中的局部矩的必要的面内取向。这可能是第一次有机会制作多维物质波孤子,以及孤子具有各向异性,由于其内在的动力学。我们的分析是基于扩展的Gross-Pitaevskii方程,其中包括三体损耗和噪声的散射长度,引起的波动的电流感应必要的磁场,这是至关重要的因素充分描述的实验条件。通过系统的三维模拟,我们发现一个斜坡的情况下,散射长度和陷阱频率的变化,从而导致在创建强大的孤子,容易承受伴随的激发的凝聚。

英文摘要:

We propose a realistic experimental setup for creating quasi-two-dimensional (2D) bright solitons in dipolar Bose-Einstein condensates (BECs), the existence of which was proposed in Phys. Rev. Lett. 100, 090406 (2008). A challenging feature of the expected solitons is their strong inherent anisotropy, due to the necessary in-plane orientation of the local moments in the dipolar gas. This may be the first chance of making multidimensional matter-wave solitons, as well as solitons featuring the anistropy due to their intrinsic dynamics. Our analysis is based on the extended Gross-Pitaevskii equation, which includes three-body losses and noise in the scattering length, induced by fluctuations of currents inducing the necessary magnetic fields, which are factors crucial to the adequate description of experimental conditions. By means of systematic 3D simulations, we find a ramping scenario for the change of the scattering length and trap frequencies which results in the creation of robust solitons, that readily withstand the concomitant excitation of the condensate.

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