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arXiv 1906.06237cond-mat.quant-gas
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相对相畴壁衰减成限制涡对:相干耦合玻色子混合物的情况

Decay of the relative phase domain wall into confined vortex pairs: the case of a coherently coupled bosonic mixture

Albert Gallemí, Lev P. Pitaevskii, Sandro Stringari, Alessio Recati

摘要:

在两个原子的超精细态的平坦的谐波囚禁玻色-爱因斯坦凝聚混合物中,受到强度为$Ω$的固定拉比耦合,相对相位的畴壁通过两种不同的机制衰减.对于小的值的$Ω$的不稳定性具有能量的性质,并与形成的涡旋-反涡旋对相同的原子超精细状态,其运动的陷阱内的原因出现的磁化,畴壁的弯曲和随之而来的碎片。对于大值的$Ω$的域壁,而不是经历动态蛇不稳定性,所造成的其有效质量的负值,并导致在快速破碎的壁成较小的域壁限制不同的原子种类的涡旋对。数值预测给出了解决的时间依赖的Gross-Pitaevskii方程在实验上可用的配置的钠原子气体的混合物。

英文摘要:

A domain wall of relative phase in a flattened harmonically-trapped Bose-Einstein condensed mixture of two atomic hyperfine states, subject to a stationary Rabi coupling of intensity $Ω$, is predicted to decay through two different mechanisms. For small values of $Ω$ the instability has an energetic nature and is associated with the formation of a vortex-antivortex pair of the same atomic hyperfine states, whose motion inside the trap causes the emergence of magnetization, the bending of the domain wall and its consequent fragmentation. For large values of $Ω$ the domain wall instead undergoes a dynamic snake instability, caused by the negative value of its effective mass and results in the fast fragmentation of the wall into smaller domain walls confining vortex pairs of different atomic species. Numerical predictions are given by solving the time-dependent Gross-Pitaevskii equation in experimentally available configurations of mixtures of sodium atomic gases.

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