  We introduce a novel mechanism to develop a turbulent flow in a spinor
Bose-Einstein condensate, consisting in the stirring of a single line vortex by
means of an external magnetic field. We find that density and velocity
fluctuations have white-noise power spectra at large frequencies and that
Kolmogorov 5/3 law is obeyed in the turbulent region. As the stirring is turned
off, the flow decays to an agitated non-equilibrium state that shows an energy
bottleneck crossover at small length scales. We demonstrate our findings by
numerically solving two-state spinor coupled 3D Gross-Pitaevskii equations. We
suggest that this mechanism may be experimentally implemented in spinor
ultracold gases confined by optical traps.
