Collisional spin transfer in an atomic heteronuclear spinor Bose gas
Collisional spin transfer in an atomic heteronuclear spinor Bose gas
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DOI：
10.1103/physrevresearch.2.032054
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
Fang Fang-Fang;J. Isaacs;A. Smull;K. Horn;L. D. Robledo-De Basabe;Yimeng Wang;C. Greene;D. Stamper-Kurn
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文献类型：
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作者：
Fang Fang-Fang;J. Isaacs;A. Smull;K. Horn;L. D. Robledo-De Basabe;Yimeng Wang;C. Greene;D. Stamper-Kurn
我们观察了一个非简并的异核自旋子原子气体中的自旋转移，该气体由一个小的$^7$Li族和$^{87}$Rb族混合组成，两种元素都处于它们的$F=1$超精细自旋流形中，温度为$\mu$K。在非平衡初始状态下制备，$^7$Li自旋分布通过非相干自旋改变碰撞向稳态分布演化。我们确定并测量了所有三种类型的自旋依赖的异核碰撞，即自旋交换、自旋混合和四极交换相互作用的截面，并发现与低能量的异核$^7$Li-$^{87}$Rb相互作用的预测一致。此外，我们观察到$^7$Li自旋子气体的稳定状态可以通过改变与之相互作用的$^{87}$Rb自旋浴的组成来控制。
We observe spin transfer within a non-degenerate heteronuclear spinor atomic gas comprised of a small $^7$Li population admixed with a $^{87}$Rb bath, with both elements in their $F=1$ hyperfine spin manifolds and at temperatures of 10's of $\mu$K. Prepared in a non-equilibrium initial state, the $^7$Li spin distribution evolves through incoherent spin-changing collisions toward a steady-state distribution. We identify and measure the cross-sections of all three types of spin-dependent heteronuclear collisions, namely the spin-exchange, spin-mixing, and quadrupole-exchange interactions, and find agreement with predictions of heteronuclear $^7$Li-$^{87}$Rb interactions at low energy. Moreover, we observe that the steady state of the $^7$Li spinor gas can be controlled by varying the composition of the $^{87}$Rb spin bath with which it interacts.