We investigate novel mechanisms of vortex nucleations in a spinor Bose condensate owing to synthetic azimuthal gauge potentials, which are light-induced effective rotations, both theoretically and experimentally. We identify the main mechanism of vortex nucleations as the dynamical instability of low-energy excitations associated with vortex splitting and pair creation at the center of condensate in respective internal spin components. This is unlike the vortex nucleations in scalar Bose condensates under mechanical stirring, where the vortices nucleate from the edge of the cloud due to surface mode excitations. Our experimental data has qualitative agreement with the time-dependent Gross-Pitaevskii equation (GPE) simulations including laser beam jittering noise in the experimental setup.
|Presenter name||Wu, Shao-Ci|
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