论文标题
长寿命的费米式Feshbach分子具有可调$ P $ - 波互动
Long-lived fermionic Feshbach molecules with tunable $p$-wave interactions
论文作者
论文摘要
超速费尔富尔菲什巴赫分子是探索量子物质具有较强$ p $ - 波相互作用的有前途的候选者，但是，它们的寿命很短。在这里，我们表征了Ultracold Fermionic $^{23} \ Mathrm {Na}^{40} \ Mathrm {K} $ Feshbach分子的$ P $ - 波碰撞，用于不同的散射长度和温度。通过增加分子的结合能，两体损耗系数可减少三个数量级，从而导致第二长的寿命，比基态分子长20倍。我们利用弹性长度和温度的弹性和非弹性碰撞的缩放，以确定弹性碰撞在无弹性碰撞范围内占主导地位的机制，从而使分子样品可以热化。我们的工作为分子碰撞的四体计算提供了基准，对于产生feshbach分子的堕落费米气体至关重要。
Ultracold fermionic Feshbach molecules are promising candidates for exploring quantum matter with strong $p$-wave interactions, however, their lifetimes were measured to be short. Here, we characterize the $p$-wave collisions of ultracold fermionic $^{23}\mathrm{Na}^{40}\mathrm{K}$ Feshbach molecules for different scattering lengths and temperatures. By increasing the binding energy of the molecules, the two-body loss coefficient reduces by three orders of magnitude leading to a second-long lifetime, 20 times longer than that of ground-state molecules. We exploit the scaling of elastic and inelastic collisions with the scattering length and temperature to identify a regime where the elastic collisions dominate over the inelastic ones allowing the molecular sample to thermalize. Our work provides a benchmark for four-body calculations of molecular collisions and is essential for producing a degenerate Fermi gas of Feshbach molecules.
