Microgravity-assisted off-axis spin vortex in a $^{87}$Rb dipolar spinor Bose-Einstein condensate

The generation of the ground state of a spin vortex in a $^{87}$Rb Bose-Einstein condensate with the assistance of an optical plug has been studied. However, gravity is everywhere, and this potential linear dependence on the spatial position will destroy the axisymmetric structure of the system with the optical plug. In this case, the question of whether the spin vortex ground state still exists remains unresolved. The present study aims to explore the impact of microgravity on the formation of the spin vortex state with the assistance of an optical plug. To this end, a simple model has been employed to provide a comprehensive understanding of the phenomenon. The Gross-Pitaevskii equations are solved by setting the optical plug intensity, adjusting the optical plug width, and adjusting the microgravity strength. This process results in the phase diagram for the single-mode state and spin vortex state. Under microgravity situations, we observe an off-axis structure of the spin vortex state. Our calculations offer a reliable approach to generating spin vortex states in a microgravity environment.