Manifestations of the roton mode in dipolar Bose-Einstein condensates.
Manifestations of the roton mode in dipolar Bose-Einstein condensates.
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DOI：
10.1103/physrevlett.100.245302
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发表时间：
2008-02
影响因子：
8.6
通讯作者：
R. Wilson;S. Ronen;J. Bohn;H. Pu
中科院分区：
文献类型：
--
作者：
R. Wilson;S. Ronen;J. Bohn;H. Pu
研究了具有长程各向异性偶极相互作用的俘获玻色-爱因斯坦凝聚体（BECs）的结构。我们发现，在足够大的偶极相互作用强度和圈闭长径比下，捕获势的微小扰动会导致凝析液密度剖面的剧烈变化。通过采用微扰理论，我们将这些振荡与偶极子bec中先前确定的“类转子”模式联系起来。同样的物理原理也适用于之前预测的偶极bec涡旋状态下的径向密度振荡。
We investigate the structure of trapped Bose-Einstein condensates (BECs) with long-range anisotropic dipolar interactions. We find that a small perturbation in the trapping potential can lead to dramatic changes in the condensate's density profile for sufficiently large dipolar interaction strengths and trap aspect ratios. By employing perturbation theory, we relate these oscillations to a previously identified "rotonlike" mode in dipolar BECs. The same physics is responsible for radial density oscillations in vortex states of dipolar BECs that have been predicted previously.