Long-wavelength polar optical modes in semiconductor heterostructures

The continuous media approach is often employed in the study of phonon properties. For polar optical phonons, we also have to consider the induced polarization field generated by the mechanical vibrations. As usual, the Bom- Huang equations support the calculations and the possible models, where the electron-phonon Hamiltonian interaction is also involved, which is important in determining important physical quantities. In the present work, we applied a fair matching method, entailing both the electrical and mechanical parts of the vibrations. The used approach is elegant and natural, in contrast with other more artificial treatments applied by other authors. We have studied II-VI semiconductor compounds (CdTe, ZnTe) and II-V semiconductor compounds (GaAs) for the QW case. Our results seem to be quite correct from the physical grounds, and to be in good agreement with experimental data.