Abstract: Based on the dielectric continuum model and Loudon’s uniaxial crystal model,quasi-confined (QC) optical phonon modes and electron-QC phonon coupling functions in quasi-one-dimensional (Q1D) wurtzite quantum well wires (QWWs) are deduced and analyzed.Numerical calculations on an AlN/GaN/AlN wurtzite QWW are performed.The results reveal that the dispersions of the QC modes are quite obvious only when the free wave-number kz in the z-direction and the azimuthal quantum number m are small.The reduced behavior of the QC modes in wurtzite quantum systems is clearly observed.Through the discussion of the electron-QC mode coupling functions,it is found that the lower-frequency QC modes in the high-frequency region play a more important role in the electron-QC phonon interactions.Moreover,our computations also prove that kz and mhave a similar influence on the electron-QC phonon coupling properties.

Key words: quasi-confined optical phonon modes, wurtzite quantum well wire, electron-phonon coupling