稳恒磁场中极性晶体膜内电子-表面声子强耦合磁极化子的有效质量

EFFECTIVE MASS OF THE ELECTRON-SURFACE PHONONS STRONG COUPLING MAGNETOPOLARON IN A SLAB OF POLAR CRYSTAL WITHIN CONSTANT MAGNETIC FIELDS

采用 Tokuda改进的线性组合算符、L agrange乘子和变分法 ,讨论了磁场中极性晶体膜内电子 -表面光学(SO)声子强耦合和电子 -体纵光学 (L O)声子弱耦合磁极化子的有效质量 ,得出了磁极化子的有效质量随膜厚和磁场变化的规律 ,对 KC1极性晶体膜进行了数值计算 ,结果表明磁极化子的有效质量随膜厚的增加而先减小后增加 ,最后趋于一个稳定值 。

The effective mass of the magnetopolaron in a slab of polar crystal within constant magnetic fields, which is a weak coupling of electron-bulk longitudinal optical (LO) phonons and strong coupling of electron-surface optical (SO) phonons, was discussed by using Tokuda's improved linear combination operator and the Lagrange multiplier and the variational method. The effective mass of the magnetopolaron was obtained as a function of the slab thickness and the magnetic fields. Numerical calculations for KC1 polar crystal slab show that the effective mass of the magnetopolaron first decreases and then increases, finally tends to a stable value with increasing slab thickness, and increases with increasing magnetic fields.