Coupling of spin waves with charge- and spin-density excitations in spin-polarized quantum wells

The coupling of spin waves with charge- and spin-density waves is shown to be induced by a spin-dependent interaction in a quantum well, which is spin polarized by a de magnetic field at an angle theta to the symmetry axis. T he mixing of the plasmonic and magnonic modes, which occurs for both intra- and intersubband transitions, depends on the coupling constant of the spin -spin interaction, the tilt angle theta, and the initial spin polarization zeta. [S0163-1829(99)08247-8].