Interface optical phonon modes and electron–phonon interactions in wurtzite GaN/ZnO quantum wells

Abstract

Abstract Within the framework of the dielectric continuum (DC) model and Loudon's uniaxial crystal model, the interface-optical-phonon (IOP) modes and their electron–phonon interactions Fr o ¨ hlich -like Hamiltonian are investigated in wurtzite multilayer heterostructures. And we also numerically calculate the dispersion relation and electron–IOP coupling strength in a wurtzite GaN/ZnO coupled quantum wells (QWs). The dispersion relation curves show that wurtzite crystal exits the anisotropic effects. The IOP modes have eight branches, which exist in frequency ranges [ ω ⊥ , TZnO , ω z , TGaN ] and [ ω ⊥ , LZnO , ω z , LGaN ] , respectively. Each mode has a definite symmetry with respect to the center of the QWs structure. The lower-frequency modes have more contribution for the electron–IOP interactions than the higher-frequency ones. In particular, we find that there are some frequency overlaps between the IOP and other optical phonon modes for the wurtzite GaN/ZnO coupled QWs.