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arXiv · 2004.05663

Collisional spin transfer in an atomic heteronuclear spinor Bose gas

Fang Fang·Joshua A. Isaacs·Aaron Smull·Katinka Horn·L. Dalila Robledo-De Basabe·Yimeng Wang·Chris H. Greene·Dan M. Stamper-Kurn
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Abstract

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.

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Fang Fang, Joshua A. Isaacs, Aaron Smull, Katinka Horn, L. Dalila Robledo-De Basabe, Yimeng Wang, Chris H. Greene, Dan M. Stamper-Kurn. 2020-04-12. Collisional spin transfer in an atomic heteronuclear spinor Bose gas. https://doi.org/10.1103/physrevresearch.2.032054

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