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arXiv 2102.09826cond-mat.quant-gascond-mat.str-el
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运动磁障碍物对二元超流气体临界能量耗散的影响

Critical Energy Dissipation in a Binary Superfluid Gas by a Moving Magnetic Obstacle

Joon Hyun Kim, Deokhwa Hong, Kyuhwan Lee, Yong-il Shin

摘要:

研究了具有两个对称自旋分量的原子超流气体在振荡磁障碍物作用下的临界能量耗散。在一定的临界振荡频率以上,磁障碍产生自旋波激发,证明了系统的自旋超流行为。当障碍物强到足以通过自旋极化的局部饱和引起密度扰动时,在较高的振荡频率下产生半量子涡旋(HQVs),揭示了临界耗散动力学从自旋波发射到HQVs脱落的特征演化.临界HQV脱落进一步研究使用脉冲线性运动的障碍物,我们确定了两个临界速度,以创建HQVs具有不同的核心磁化。

英文摘要:

We study the critical energy dissipation in an atomic superfluid gas with two symmetric spin components by an oscillating magnetic obstacle. Above a certain critical oscillation frequency, spin-wave excitations are generated by the magnetic obstacle, demonstrating the spin superfluid behavior of the system. When the obstacle is strong enough to cause density perturbations via local saturation of spin polarization, half-quantum vortices (HQVs) are created for higher oscillation frequencies, which reveals the characteristic evolution of critical dissipative dynamics from spin-wave emission to HQV shedding. Critical HQV shedding is further investigated using a pulsed linear motion of the obstacle, and we identify two critical velocities to create HQVs with different core magnetization.

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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