Dispersions of quasi-confined optical phonon modes and their electron-phonon interactions in an asymmetric wurtzite AlxGa1-xN/GaN/AlyGa1-yN quantum well

作者：Zhang; Li

来源：Superlattices and Microstructures, 2006, 40(3): 144-154.

DOI：10.1016/j.spmi.2006.06.016

• quasi-confined optical phonon
• asymmetric wurtzite QW
• nitride-based semiconductor

Within the framework of the dielectric continuum model and Loudon's uniaxial crystal model, the properties of the quasi-confined (QC) optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wurtzite quantum well (QW) are deduced via the method of electrostatic potential expanding. The present theoretical scheme can be treated as a generalization of the QC optical phonons in an ordinary wurtzite double heterostructures QWs, and it can be reduced naturally to the situation of the symmetrical wurtzite QW once a suite of symmetrical parameters are adopted. Numerical computation on an asymmetric AlN/GaN/Al0.15Ga0.85N wurtzite QW are performed, and a detailed comparison with the case in symmetric wurtzite QW is carried out. The calculated results show that the structural asymmetry of wurtzite QW changes greatly the dispersion behaviors and the electrostatic potential distributions of the QC optical phonon modes.

• 出版日期2006-9
• 单位北京大学; 广州番禺职业技术学院