Optical vibration modes and electron-phonon interaction in ternary mixed crystals of polar semiconductors |
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引用本文: | 梁希侠,班士良.Optical vibration modes and electron-phonon interaction in ternary mixed crystals of polar semiconductors[J].中国物理 B,2004,13(1):71-81. |
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作者姓名: | 梁希侠 班士良 |
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作者单位: | Department of Physics, Inner Mongolia University, Hohhot 010021, China |
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基金项目: | Project supported partly by the National Natural Science Foundation of China (Grant No 10164003). |
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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.
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关 键 词: | optical vibration mode electron-phonon interaction ternary mixed crystal |
收稿时间: | 2003-03-12 |
修稿时间: | 7/9/2003 12:00:00 AM |
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