Spin waves of the spin‐polarized electron gas in semimagnetic quantum wells

Spin flip waves and spin density fluctuations of a two-dimensional spin-polarized electron-gas in a semimagnetic Cd 1-0.08 Mn 0.008 Te quantum well are observed by Resonant Raman Scattering. Application of a magnetic field splits the spin subbands and a static spin polarization is induced. Wavevector and field experimental dispersions are very well reproduced by Local Spin Density Approximation calculations including recent Quantum Monte Carlo evaluation of coulomb correlations corrections. We show how to extract the spin polarization degree. A maximum value of 35% is deduced from measurements.