Optical vibration modes and electron-phonon interaction in ternary mixed crystals of polar semiconductors

• 来源期刊: 中国物理（英文版）
• 关键词: optical vibration mode electron-phonon interaction ternary mixed crystal
• 年，卷（期）: 2004,（1）
• 页码范围: 71-81
• 页数: 11页
• 语种: 英文

摘要

Optical vibrations of the lattice and the electron-phonon interaction in polar ternary mixed crystals are studied in the framework of the continuum model of Born and Huang and the random-element-isodisplacement model. A normal-coordinate system to describe the optical vibration in ternary mixed crystals is correctly adopted to derive a new Frohlich-like Hamiltonian for the electron-phonon interaction including the unit-cell volume variation influence.The numerical results for the phonon modes, the electron-phonon coupling constants and the polaronic energies for several typical materials are obtained. It is verified that the nonlinearity of the electron-phonon coupling effects with the composition is essential and the unit-cell volume effects cannot be neglected for most ternary mixed crystals.