Dramatic reductions in inelastic cross sections for ultracold collisions near Feshbach resonances.
Dramatic reductions in inelastic cross sections for ultracold collisions near Feshbach resonances.
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费什巴赫共振附近的超冷碰撞的非弹性横截面急剧减少。
DOI：
10.1103/physrevlett.103.163201
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发表时间：
2009
影响因子：
8.6
通讯作者：
Hutson JM
中科院分区：
文献类型：
--
作者：
Hutson JM
我们发现，在零能量费什巴赫共振附近，低能量非弹性截面可以减小也可以增大。当使用外场调谐这种共振时，散射长度的实部和虚部显示出波峰和波谷的不对称振荡。在有利的情况下，非弹性碰撞率可以降低到几乎为零。这对于实现分子的蒸发和交感冷却的努力可能是重要的。
We show that low-energy inelastic cross sections can decrease as well as increase in the vicinity of a zero-energy Feshbach resonance. When an external field is used to tune across such a resonance, the real and imaginary parts of the scattering length show asymmetric oscillations with both peaks and troughs. In favorable circumstances, the inelastic collision rate can be reduced to almost zero. This may be important for efforts to achieve evaporative and sympathetic cooling for molecules.