Ultracold atoms prepared in excited internal states can escape from the trap through inelastic collisions. A magnetic field can be used to suppress the s-wave loss rate coefficient near an s-wave Feshbach resonance. However, at the temperature of μK the p-wave loss rate coefficient becomes increasingly important as the temperature increases. The unsuppressed p-wave loss rate coefficient can far exceed the suppressed s-wave loss rate coefficient, and severely restricts the reduction of the total loss rate coefficient. We calculate the collision rate coefficients of ultracold ⁸⁵Rb and ⁸⁷Rb atoms prepared in excited hyperfine and Zeeman states using the coupled-channel method. We find that in Rb85(F1=3,mF1=3) + Rb87(F2=1,mF2=−1) and Rb85(F1=2,mF1=−2) + Rb87(F2=2,mF2=−2) there exist broad p-wave Feshbach resonances located near s-wave Feshbach resonances, and find that the s- and p-wave loss rate coefficients can be simultaneously suppressed by a magnetic field in the temperature range from 1 to 30 μK. In particular, for Rb85(F1=3,mF1=3) + Rb87(F2=1,mF2=−1) the proportion of the s- and p-wave loss rate coefficients in the total loss rate coefficient can be well manipulated by adjusting the magnetic field.

中文翻译：

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磁场抑制宽 s 波和 p 波 Feshbach 共振附近相互作用引起的损耗率系数

以内部激发态制备的超冷原子可以通过非弹性碰撞从陷阱中逃逸。磁场可以用来抑制秒- 附近的波浪损失率系数秒-波 Feshbach 共振。然而，在温度为μK的p- 波损失率系数随着温度升高变得越来越重要。未被压抑的p-波损率系数可远超抑制秒-波损率系数，严重制约着总损率系数的降低。我们使用耦合通道方法计算了在激发超精细和塞曼状态下制备的超冷⁸⁵ Rb 和⁸⁷ Rb 原子的碰撞率系数。我们发现在 Rb85(F1个=3个,米F1个=3个) + Rb87(F2个=1个,米F2个=−1个) 和 Rb85(F1个=2个,米F1个=−2个) + Rb87(F2个=2个,米F2个=−2个) 存在广泛的p-波 Feshbach 共振位于附近秒-波 Feshbach 共振，并发现秒- 和p-波损耗率系数可以在1到30的温度范围内同时被磁场抑制μK. 特别是对于 Rb85(F1个=3个,米F1个=3个) + Rb87(F2个=1个,米F2个=−1个) 的比例秒- 和p-总损失率系数中的波损失率系数可以通过调整磁场得到很好的控制。