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We report the observation of the twisted decay of quadruply charged vorticesin an atomic Bose-Einstein condensate. Supporting numerical simulations showthat the singly-charged vortices, which result from the decay of amulti-charged vortex, twist around intertwined in the shape of helical Kelvinwaves. Finally, we propose to apply this effect to generate an almost isotropicstate of turbulence which we characterize in terms of the velocity statistics.

Twisted unwinding of multi-charged quantum vortex and generation of turbulence in atomic Bose-Einstein condensates