arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.03104cond-mat.quant-gas
收藏

超流费米气体中双量子化涡旋的分裂不稳定性

Splitting instability of a doubly quantized vortex in superfluid Fermi gases

Wout Van Alphen, Hiromitsu Takeuchi, Jacques Tempere

AI总结:

本文通过低能有效场论研究超流费米气体BEC-BCS渡越中双量子化涡旋的分裂不稳定性,发现其特性随渡越剧烈变化,并在渡越区增强声子发射、缩短涡旋寿命。

摘要:

我们通过低能有效场论研究了超流费米气体在BEC-BCS渡越中的双量子化涡旋的分裂不稳定性。我们的线性稳定性分析和非平衡数值模拟揭示,不稳定性的特征在渡越过程中发生剧烈变化。在BEC极限中,涡旋通过声子发射分裂为两个单量子化涡旋,而这种发射在BCS极限中完全不存在。在渡越区域,不稳定性和声子发射得到增强,双量子化涡旋的寿命变得最小。发射的声子可以观察到为因旋转超辐射而放大的螺旋图案,该机制已知用于从旋转黑洞带走能量和角动量。我们还研究了温度、粒子数不平衡和三维效应的影响。

英文摘要:

The splitting instability of a doubly-quantized vortex in the BEC-BCS crossover of a superfluid Fermi gas is investigated by means of a low-energy effective field theory. Our linear stability analysis and non-equilibrium numerical simulations reveal that the character of the instability drastically changes across the crossover. In the BEC-limit, the splitting of the vortex into two singly-quantized vortices occurs through the emission of phonons, while such an emission is completely absent in the BCS-limit. In the crossover-regime, the instability and phonon emission are enhanced, and the lifetime of a doubly-quantized vortex becomes minimal. The emitted phonon can be observed as a spiraling pattern amplified due to the rotational superradiance, known as a mechanism to carry away energy and angular momentum from a spinning black hole. We also investigate the influence of temperature, population imbalance, and three-dimensional effects.

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。

↑