Dispersions of propagating optical phonons and electron-phonon interactions in wurtzite GaN/ZnO quantum wells

摘要

Based on the dielectric-continuum model and Loudon's crystal model, the propagating optical phonons and electron-phonon interactions are studied by using the determinate method. The dispersions and electron-phonon coupling functions of the propagating optical phonons are investigated for wurtzite GaN/ZnO single quantum well (QW). The numerical results show that there are infinite propagating phonon branches by a quantum number m in the two regions. The propagating optical phonons are more dispersive for decreasing m. Moreover, the electron-phonon coupling functions have oscillating behavior in barrier layer (GaN), the periods of electron-phonon coupling functions in low frequency region are larger than those in high frequency region. The electron-phonon coupling functions of propagating phonon modes in low frequency region are more important than those in high frequency region.