Single and double optical resonant Raman scattering is demonstrated in semiconductor microcavities. Its evolution towards excitonic ingoing resonance relies on cavity-polaritons as intermediated steps of the inelastic scattering. Implications for high-sensitivity spectroscopy and low-power stimulated processes are emphasized.
Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd_{1-x}Mn_xTe quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin-subbands and a spin-polarization is induced in the electron gas. Above some critical field, a collective spin-flip mode, which disperses with in-plane wave vector, dominates the spectra. The energy of this mode is given by the bare Zeeman energy at vanishing wave vector as predicted by Larmor's theorem and its in-plane dispersion is well described by a model of the interacting polarizability of a spin polarized electron gas when both exchange and correlation are taken into account.
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