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采用格林函数的方法,研究极性晶体膜中束缚极化子的有效质量随膜厚d的变化关系。得出电子-体LO声子相互作用以及电子-SO声子相互作用都对束缚极化子的有效质量有贡献。通过对KCl半导体膜的数值计算表明,束缚极化子的有效质量随膜厚d的增加而减少;当膜厚小于5 nm时电子-SO声子相互作用对束缚极化子的有效质量起主要贡献,但是当膜厚大于10 nm时,电子-体LO声子相互作用对束缚极化子的有效质量起主要贡献,当膜厚大于5 nm而小于10 nm时,二者共同影响束缚极化子的有效质量;另外,由于束缚势的存在,使束缚极化子的有效质量增大,这主要是由于束缚势的存在,使电子-声子间的相互作用增强,极化子效应增大而引起的。
The Green function method is used to study the relationship between the effective mass of the bound polaron in the polar crystal film and the film thickness d. It is concluded that both the electron-body LO phonon interaction and the electron-SO phonon interaction contribute to the effective mass of the binding polaron. The numerical calculation of the KCl semiconductor film shows that the effective mass of the binding polaron decreases with the increase of the film thickness d. When the film thickness is less than 5 nm, the electron -SO phonon interaction plays an important role on the effective mass of the binding polaron But when the film thickness is larger than 10 nm, the interaction between the electron-body LO phonon and the polaron contributes to the effective mass of the binding polaron. When the film thickness is more than 5 nm and less than 10 nm, the two affect the bound polarization In addition, due to the existence of the binding potential, the effective mass of the binding polaron is increased, which is mainly due to the existence of the binding potential, so that the interaction between the electron and the phonon is enhanced and the polaron effect is increased Caused by.