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arXiv 2007.03723physics.atom-phcond-mat.quant-gas
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$p$波费什巴赫共振附近一维费米子的碰撞损失

Collisional loss of one-dimensional fermions near a $p$-wave Feshbach resonance

Ya-Ting Chang, Ruwan Senaratne, Danyel Cavazos-Cavazos, Randall G. Hulet

摘要:

研究了超冷$^6$ Li原子中准一维自旋极化费米气体在$p$波费什巴赫共振附近的碰撞损失.我们测量准一维的$p$波共振的位置,并观察到约束引起的位移和加宽。我们发现,三体损耗系数$L_3$作为准一维约束的函数对约束强度几乎没有依赖性。我们还分析了原子损失与两步级联三体损失模型中,弱结合的二聚体形成之前,它们的损失所产生的原子-二聚体碰撞。我们的数据与这个模型是一致的。我们还发现了一个可能的抑制二聚体弛豫率与强准一维禁闭。我们讨论了这些测量观测准一维$p$波配对的影响。

英文摘要:

We study collisional loss of a quasi-one-dimensional (1D) spin-polarized Fermi gas near a $p$-wave Feshbach resonance in ultracold $^6$Li atoms. We measure the location of the $p$-wave resonance in quasi-1D and observe a confinement-induced shift and broadening. We find that the three-body loss coefficient $L_3$ as a function of the quasi-1D confinement has little dependence on confinement strength. We also analyze the atom loss with a two-step cascade three-body loss model in which weakly bound dimers are formed prior to their loss arising from atom-dimer collisions. Our data are consistent with this model. We also find a possible suppression in the rate of dimer relaxation with strong quasi-1D confinement. We discuss the implications of these measurements for observing $p$-wave pairing in quasi-1D.

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