The charge and spin response of a spin--polarized electron gas is investigated including terms beyond the random phase approximation. We evaluate the charge response, the longitudinal and transverse spin response, and the mixed spin--charge response self--consistently in terms of the susceptibility functions of a non--interacting system. Exchange--correlation effects between electrons of spin $\sigma$ and $\sigma^{ '}$ are included following Kukkonen and Overhauser, by using spin--polarization dependent generalized Hubbard local field factors ${ G_\sigma}^{ \pm}$ and ${ G_{ \bar\sigma}}^{ \pm}$. The general condition for charge--density and spin--density--wave excitations of the system is discussed.
Categories: cond-mat