ZhETF, Vol. 122,
p. 258 (August 2002)
(English translation - JETP,
Vol. 95, No. 2,
available online at www.springer.com
NONLINEARITY EFFECTS IN WAVE PROPAGATION IN MULTICOMPONENT BOSE-EINSTEIN CONDENSATES
Mazets I.E., Orlenko E.V., Matisov B.G.
Received: January 22, 2002
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 density waves dramatically changes the dependence of the frequency on the wavenumber. On the contrary, the density wave propagation is much less modified by nonlinearity effects. A similar phenomenon in a miscible two-component condensate is also studied.