Nonlinear effects in propagation of waves in a spinor Bose condensate

I. E. Mazets
Ioffe Physico-Technical Institute, St. Petersburg, Russia
B. G. Matisov, E. V. Orlenko
St. Petersburg State Technical University

We consider a spinor Bose-Einstein condensate in its polar ground state. We analyze magnetization waves of a finite amplitude and show that their nonlinear coupling to the density waves change the dependence of the frequency on the wavenumber dramatically. In contrary, the density wave propagation is much less modified by the nonlinearity effects. A similar phenomenon in a miscible two-component condensate is also studied.

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