极性晶体膜中的束缚极化子的有效质量(英文)  

The Effective Mass of 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电子信息学院,内蒙古通辽028043

出　　处：《发光学报》2007年第6期827-831,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金资助项目(10347004)~~

摘　　要：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。Taking into account the interaction of an electron with bulk longitudinal-optical （LO） and surface longi- tudinal-optical （SO） phonons, we studied the effective mass of the bound polaron in a polar slab by using the method of Green＇s function. The effective mass was derived as function of slab thickness, and it reduces with the increase of the slab thickness ; for a very thin slab （ d 〈 5 nm）, the effective mass was mainly attributed to the electron-SO pho- non interaction, oppositely, d 〉 10 nm, the effective mass was mainly attributed to the electron-LO phonon interac- tion. But when 5 nm 〈 d 〈 10 nm, all of them must be consider together. Especially, the effective mass increased when there was the Coulomb potential because the interactions between the electrons and phonons was strengthened.

关 键 词：极性晶体膜 束缚极化子 格林函数 有效质量 

分 类 号：O469[理学—凝聚态物理] O472.3[理学—电子物理学]