极性晶体膜中束缚极化子的有效质量  

The bound polaron in a polar slab

作　　者：王秀清[1] 肖景林[1] 

机构地区：[1]内蒙古民族大学物理与机电学院,通辽028043

出　　处：《原子与分子物理学报》2007年第6期1189-1193,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10347004)

摘　　要：采用线性组合算符法和变分法,讨论了极性晶体膜中电子与SO声子耦合强,与LO声子耦合弱的电子-声子相互作用系统的有效质量.得出了束缚极化子的有效质量随膜厚的变化规律.对KCl材料进行数值计算的结果表明,不同支声子与电子相互作用对有效质量的贡献并不相同,而且由于束缚势的存在,使有效质量增大.With the further development of the epitaxial technique and the the manufacture of the semiconductor materials, considerable interest has been shown in the investigation of the quantum well and semiconductor superlattice because of their wide application as techniques, consequently, understanding the role of impurities in a polar slab is of particular importance. We studied the effective mass of the system when there is a bounding potential and strong coupling with electron-surface optical phonons and weak coupling with electron-bulk longitudinal optical phonons in a slab of polar crystal by using the Huybrecht, s improved linear combination operator and the Lagrange multiplier method. We deduced the variation frequent contacts λ, the effective mass with the slab thickness. The numerical calculations for KCl crystal show that the variation frequent contacts and the effective mass are all reduce with the increase of the slab thickness. And the contributions of the interactions between the electron and the different branchs of phonons to the effective mass are greatly difference. We also find that the effective mass and ,λ all increased when there is a bounding potential.

关 键 词：极性晶体膜 束缚极化子 线性组合算符 有效质量 膜厚 

分 类 号：O469[理学—凝聚态物理]