Collisional spin transfer in an atomic heteronuclear spinor Bose gas
arXiv:2004.05663 · doi:10.1103/PhysRevResearch.2.032054
Abstract
We observe spin transfer within a non-degenerate heteronuclear spinor atomic gas comprised of a small Li population admixed with a Rb bath, with both elements in their hyperfine spin manifolds and at temperatures of 10's of K. Prepared in a non-equilibrium initial state, the 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 Li-Rb interactions at low energy. Moreover, we observe that the steady state of the Li spinor gas can be controlled by varying the composition of the Rb spin bath with which it interacts.
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