ELECTRON-OPTICAL-PHONON SCATTERING IN WURTZITE CRYSTALS

We present Frohlich-like electron-optical-phonon interaction Hamiltoni an for wurtzite crystals in the long-wavelength limit based on the mac roscopic dielectric continuum model and the uniaxial model. In general , the optical-phonon branches support mixed longitudinal and transvers e modes due to the anisotropy. We calculate electron scattering rate d ue to the optical phonons in the bulk wurtzite GaN and demonstrate tha t the scattering rate due to transverselike phonon processes can be st rongly enhanced over a range of angles with respect to the c asis. For the case of longitudinal-like modes, the anisotropy is small and the result is almost the same as that obtained with the cubic Frohlich Ham iltonian.