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arXiv 1901.10751cond-mat.quant-gas
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超流费米气体中暗孤子Snake不稳定性与Josephson不稳定性的交叉

Crossover between snake instability and Josephson instability of dark solitons in superfluid Fermi gases

Wout Van Alphen, Hiromitsu Takeuchi, Jacques Tempere

摘要:

超流玻色气体中的暗孤子通过蛇不稳定机制衰减,除非它们被强限制。最近在超流费米气体中的实验也解释了通过这种机制的孤子衰变。然而,我们使用有效场数值模拟和微扰分析表明,在BEC和BCS制度的孤子衰减之间存在质的差异。在相互作用区域的BEC侧,序参量的振幅起伏引起了特征蛇形变形,而在BCS侧,相位起伏通过形成局部约瑟夫森电流破坏了孤子核.后一种机制与蛇形不稳定性在性质上是不同的,这种差异应该是实验检测。

英文摘要:

Dark solitons in superfluid Bose gases decay through the snake instability mechanism, unless they are strongly confined. Recent experiments in superfluid Fermi gases have also interpreted soliton decay via this mechanism. However, we show using both an effective field numerical simulation and a perturbative analysis that there is a qualitative difference between soliton decay in the BEC- and BCS-regimes. On the BEC-side of the interaction domain, the characteristic snaking deformations are induced by fluctuations of the amplitude of the order parameter, while on the BCS-side, fluctuations of the phase destroy the soliton core through the formation of local Josephson currents. The latter mechanism is qualitatively different from the snaking instability and this difference should be experimentally detectable.

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