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在无序元胞孤立位移 (MREI)模型下 ,考虑激子与混晶中的两支光学声子的相互作用 ,利用变分法计算了极性三元混晶 (TMCs)中的Wannier激子的结合能。数值计算给出几种混晶材料的结合能随组份x的变化关系。讨论了混晶中的两支光学声子对激子结合能的贡献。结果表明 ,当电子和空穴有效质量相差较大时 ,电声子相互作用对激子结合能有着重要的贡献 ,声子对结合能的影响随混晶组份非线性变化的。同时讨论了有效声子近似 (EPMA)在计算激子结合能时的适用范围
Under the MREI model, considering the interaction between excitons and two optical phonons in mixed crystal, the Wannier excitons in polar ternary mixed crystals (TMCs) were calculated by variational method The binding energy. The numerical calculation shows the change of the binding energy of several mixed crystal materials with the component x. The contributions of two optical phonons in the mixed crystal to the exciton binding energy are discussed. The results show that when the difference between the effective mass of electrons and holes is large, the interaction of electro phonon has an important contribution to the exciton binding energy. The influence of phonon on the binding energy varies nonlinearly with the mixed crystal. The applicable range of effective phonon approximation (EPMA) in the calculation of exciton binding energy is also discussed