arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.0686cond-mat.quant-gas
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磁约束下玻色-爱因斯坦凝聚体中的三维环形涡旋孤子及其稳定性

Three dimensional ring vortex solitons and their stability in Bose-Einstein condensates under magnetic confinement

Li Ji, Deng-Shan Wang, Zhi-Yong Wu, Yan-Mei Yu, Wu-Ming Liu

摘要:

本文研究了在简谐势约束下,吸引和排斥的BEC中的环形涡旋孤子。对于给定的原子相互作用强度,数值计算得到了一类由内禀涡度的径向激发数和缠绕数定义的稳定环涡孤子。我们发现,环形涡旋孤子的基态和径向激发态的稳定性对缠绕数的依赖性不同。大缠绕数的环形涡旋孤子的基态对随机扰动是动态不稳定的。具有大缠绕数的环形涡旋孤子的径向激发态对应于增加的崩塌阈值,因此可以在足够小的原子相互作用强度下稳定。基态和径向激发态在大的相互作用强度下也表现出不同的动力学演化。前者在横向上同时表现出对称分裂,而后者在纵向上表现出周期性的扩张-合并循环。

英文摘要:

The three-dimensional study of the ring vortex solitons is conducted for both attractive and repulsive BECs subject to harmonic potential confinement. A family of stationary ring vortex solitons, which is defined by the radial excitation number and the winding number of the intrinsic vorticity, are obtained numerically for a given atomic interaction strength. We find that stabilities of the ground and radially excited states of the ring vortex soliton are dependent on the winding number differently. The ground state of the ring vortex soliton with the large winding number is unstable dynamically against random perturbation. The radially excited state of the ring vortex soliton with large winding number corresponds to the increased collapse threshold, and therefore can be made stable for sufficiently small atomic interaction strengths. The ground and radially excited states also demonstrate different dynamical evolutions under large atomic interaction strengths. The former exhibits simultaneously symmetrical splitting in the transverse plane, while the latter displays periodically expand-merge cycles in the longitudinal direction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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