Date of Original Version
A microscopic theory is proposed for transverse dynamics and zero-temperature attenuation in polarized Fermi liquids. The transport equations are a set of two coupled equations in two ‘‘partial transverse densities,’’ which do not reduce to a single equation in a mixed component of a single-particle distribution. The effective interaction is linked to an irreducible vertex by an integral equation, and cannot be given as a limit of a full vertex. A framework for a generalized nonlocal Landau theory is established. The spectrum of attenuating spin waves is calculated at arbitrary polarizations and densities.
A.E. Meyerovich, K.A.Musaelian. Transverse Dynamics and Relaxation in Spin-Polarized or Two-Level Fermi Systems, Phys.Rev. B 47, 2897 (1993). Available at: http://dx.doi.org/10.1103/PhysRevB.47.2897