Abstract
We perform a numerical study of spin turbulence in a two-dimensional trapped spin-1 spinor Bose-Einstein condensate, focusing on the energy spectrum. The spin turbulence in the trapped system is generated by instability of the helical structure of the spin density vector in the initial state. Our numerical calculation finds that in the trapped system, the spectrum of the spin-dependent interaction energy in the ferromagnetic case exhibits a $\ensuremath{-}7/3$ power law, which was confirmed in a uniform system by our previous study. The relation between the $\ensuremath{-}7/3$ power law and the motion of the spin density vector is discussed by investigating the orbits of dynamical variables in the spin space.
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