中国物理B ›› 2004, Vol. 13 ›› Issue (1): 71-81.doi: 10.1088/1009-1963/13/1/014
梁希侠, 班士良
Liang Xi-Xia (梁希侠), Ban Shi-Liang (班士良)
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 Fr?hlich-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.
中图分类号: (Phonon interactions)