Exciton-mediated Raman scattering in multiple quantum wells

The main results of a microscopic theory on the resonant Raman profile mediated by exciton states in multiple quantum wells (MQW's) are presented. The theory takes proper account of effects of heavy- and light-hole mixing of the exciton states, and adopts an appropriate expression for electron-phonon interaction. The selection rules on exciton–LO-phonon scattering in MQW's are summarized, which reveals the roles played by intrasubband and intersubband exciton Raman scattering. Numerical calculations show the dependence of exciton-phonon scattering on the well width and the phonon modes. The mechanism for the asymmetry of the incoming and outgoing resonance is discussed.