NEW POLARON EFFECT IN MAGNETOOPTIC PHENOMENA IN A QUANTUM-WELL

It is predicted that resonance coupling between two discrete electron energy levels corresponding to different size-quantization quantum num bers and different Landau quantum numbers can occur in a quantum well in a quantizing magnetic field. The resonance coupling is due to the i nteraction of an electron with LO phonons and results in the formation of polaron states of a new type. It is shown that for a certain value of the magnetic field, which depends on the splitting of the electron size-quantization levels, the absorption peak and the two-phonon reso nance Raman scattering peak split into two components, the separation between which is determined by the electron-phonon coupling constant. The resonance coupling between size-quantization levels with the same Landau quantum numbers is also studied. The splitting of the peaks in this case is virtually independent of the magnetic field and can be ob served in much weaker fields. The experimental observation of the effe ct will make it possible to determine the relative position of the ele ctronic levels and the electron-phonon coupling constant. (C) 1997 Ame rican Institute of Physics.