Internal state conversion in ultracold gases.
Internal state conversion in ultracold gases.
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超冷气体的内部状态转换。
DOI：
10.1103/physrevlett.88.230404
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发表时间：
2001
影响因子：
8.6
通讯作者：
F. Laloë
中科院分区：
文献类型：
--
作者：
J. Fuchs;D. Gangardt;F. Laloë
我们考虑一个超冷气体（非凝聚）玻色子或费米子与两个内部状态，我们研究这些状态之间的过渡频率的梯度的效果。当一个π/2的射频脉冲施加到样品上时，碰撞过程中的交换效应将原子转移到内部状态，这取决于它们的速度方向。这导致在短时间之后，两个状态之间的空间分离。动力学方程的解析和数值求解，结果与Lewandowski等人最近的观察结果一致。
We consider an ultracold gas of (noncondensed) bosons or fermions with two internal states, and we study the effect of a gradient of the transition frequency between these states. When a pi/2 rf pulse is applied to the sample, exchange effects during collisions transfer the atoms into internal states which depend on the direction of their velocity. This results, after a short time, in a spatial separation between the two states. A kinetic equation is solved analytically and numerically; the results agree well with the recent observations of Lewandowski et al.