Magnetic-field-enhanced outgoing excitonic resonance in multi-phonon   Raman scattering from polar semiconductors
  A combined scattering mechanism involving the states of free electron-hole pairs (exciton continuum) and discrete excitons as intermediate states in the multi-phonon Raman scattering leads to (1) a strong increase of the scattering efficiency in the presence of a high magnetic field and to (2) an outgoing excitonic resonance: the two features are not compatible when only free pairs (leading to a strong increase of the scattering efficiency under the applied magnetic field) or discrete excitons (resulting in the outgoing resonance at the excitonic gap) are taken into account. 
I.G.Lang (1), A.V.Prokhorov (1), M.Cardona (2), V.I.Belitsky (3),   A.Cantarero (3), S.T.Pavlov (1 and 3) ((1) A.F.Ioffe Phy...