论文标题
超级流体费米气体中双重量化涡流的分裂不稳定
Splitting instability of a doubly quantized vortex in superfluid Fermi gases
论文作者
论文摘要
通过低能量有效的田间理论研究了超氟费米气体的BEC-BCS交叉中双重量化涡流的分裂不稳定。我们的线性稳定性分析和非平衡数值模拟表明，整个跨界的不稳定性特征发生了巨大变化。在BEC限制中，通过声子的发射，将涡流为两个单一量化的涡流发生，而在BCS限制中，这种发射完全不存在。在交叉指控中，不稳定性和声子发射得到增强，并且双重量化的涡流的寿命变得最小。由于旋转超沉淀，可以将发出的声子视为螺旋模式放大的螺旋模式，该模式被称为一种机制，可从旋转的黑洞中携带能量和角动量。我们还研究了温度，人口失衡和三维影响的影响。
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.
