Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-Independent Interactions
Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-Independent Interactions
We observe spin rotations caused by atomic collisions in a nonequilibrium Bose-condensed gas of $^{87}\mathrm{Rb}$. Reflection from a pseudomagnetic barrier creates counterflow in which forward- and backward-propagating matter waves have partly transverse spin directions. Even though inter-atomic interaction strengths are state independent, the indistinguishability of parallel spins leads to spin …