偶极玻色-爱因斯坦凝聚体中涡旋线的Kelvon-Roton不稳定性
Kelvon-roton instability of vortex lines in dipolar Bose-Einstein condensates
摘要：
研究了偶极凝聚体中涡旋线的物理性质。由于偶极相互作用的非定域性，涡旋的三维特征在偶极气体中比在典型的短程相互作用气体中起着更重要的作用。特别是，偶极相互作用显着影响涡线的横模的稳定性。值得注意的是，在沿涡线存在周期性势的情况下，横模谱中可能会出现旋转子最小值。我们讨论了适当的条件下，在这个旋转最小可能最终导致不稳定的直涡线，打开新的场景中的偶极气体的旋涡。
英文摘要：
The physics of vortex lines in dipolar condensates is studied. Due to the nonlocality of the dipolar interaction, the 3D character of the vortex plays a more important role in dipolar gases than in typical short-range interacting ones. In particular, the dipolar interaction significantly affects the stability of the transverse modes of the vortex line. Remarkably, in the presence of a periodic potential along the vortex line, a roton minimum may develop in the spectrum of transverse modes. We discuss the appropriate conditions at which this roton minimum may eventually lead to an instability of the straight vortex line, opening new scenarios for vortices in dipolar gases.
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