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通过导出描述三维、二维和一维混晶中电子-声子相互作用的哈密顿量,讨论了砷化物三元混晶中原胞体积效应与电子-声子耦合强度和原胞体积失配率的关系。结果表明:电子-声子耦合越强,原胞失配率越大,体积效应越明显;只有原胞体积失配率较小和电子-声子的耦合强度较弱时,体积效应的影响是可以略去的;由于维度受限增强了电子-声子相互作用强度,二维光学极化子效应的非线性变化比三维的更明显;而一维光学极化子效应的非线性变化比三维和二维情形要弱。
By deducing the Hamiltonian describing the electron-phonon interaction in three-dimensional, two-dimensional and one-dimensional mixed crystals, we discuss the relationship between the cell volume effect and the electron-phonon coupling strength and the cell volume mismatch rate in arsenide ternary mixed crystals Relationship. The results show that the stronger the electron-phonon coupling is, the larger the cell mismatch rate is, the more obvious the volume effect is. The volume effect is only affected by the small cell mismatch rate and weak coupling of phonon / phonon Can be omitted. Due to the limitation of the dimension, the intensity of the electron-phonon interaction is enhanced, the nonlinear change of two-dimensional optical polaron effect is more obvious than that of the three-dimensional one. However, the nonlinear change of the one-dimensional optical polaron effect is smaller than the three- And the two-dimensional situation is weaker.