Physical Review B
The American Physical Society
The dispersion relations of the collective excitations induced in a 2D spin-polarized electron gas are derived within the framework of the Landau-Silin theory applied to a two-component Fermi liquid. The quasiparticle interaction is described by spin-dependent coefﬁcients, which are parametric functions of the initial degree of polarization. The motion of the low-energy excitations satisﬁes a semiclassical transport equation solved consistently with the Maxwell equations for the electromagnetic ﬁeld produced by spin and charge ﬂuctuations. The long-wavelength limit of the self-sustained oscillations is analyzed as a function of the initial degree of polarization of the system, preset by a dc magnetic induction. ͓S0163-1829͑98͒01548-3͔
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