自旋和声子之间相互作用对TlBr晶体中表面磁极化子性质的影响  

Influence of Spin and Interaction between Phonons on the Properties of Surface Magnetopolaron in TIBr Crystal

作　　者：李子军[1] 王成舜[2] 肖景林[1] 

机构地区：[1]内蒙古民族师范学院物理系,内蒙古通辽028043 [2]内蒙古呼伦贝尔学院物理系,内蒙古海拉尔021008

出　　处：《发光学报》2000年第2期89-93,共5页Chinese Journal of Luminescence

基　　金：中科院激发态物理开放研究实验室;内蒙古自然科学基金资助课题

摘　　要：在考虑电子自旋和声子之间相互作用的同时，采用线性组合算符和微扰法研究半无限ＴＩＢｒ晶体内表面磁极化子处于基态时的振动频率和诱生势与磁场Ｂ和距晶体表面距离（坐标）ｚ之间的依赖关系。With the development of magneto-optical technology, the properties of the Polaron in magnetic field have been of considerable interest. Larsen proposed a novel operator method to investigate the properties of 2D Polarons. Peeters et al discussed the properties of the magnetopolaron using the Feynmann path-integral approach. Wei and co-workers studied the induced potential and the self-energy of an interface magnetopolaron using the Green-function method. The properties of the surface magnetopolaron have been discussed by the method of a linear-combination operator and a perturbation by the present authors and co-workers. In fact, so far research on the polaron has been restricted to approximation and calculation where the electron spin and the interaction between phonons of different wave vectors in the recoil process are neglected. There is weak bulk but strong surface coupling between the electrons and phonons for semi-infinite TIBr crystal in a magnetic field. So far, research into this has been very scarce. The purpose of this present paper is to explore the effects of the electron spin and the interaction between phonons of different wave vectors in the recoil process on the properties of the surface polaron in magnetic field. With both the weak coupling between the electron and bulk LO phonon and the strong coupling between the electron and SO phonon included, an expression for the effective Hamiltonian of the surface magetopolaron is obtained. With considering the electron spin and the corresponding interaction, the influence on the effective Hamiltonian, vibration frequency, induced potential and effective interaction potential of the surface magnetopolaron in semi-infinite TIBr crystal are investigated by a linear combination operator and perturbation method. Numerical calculations for a TIBr crystal, as an example, are performed, and some properties of the vibration frequency and the induced potential of the surface magnetopolaron are discussed.

关 键 词：表面磁极化子 自旋 声子 相互作用 溴化钛晶体 

分 类 号：O471.3[理学—半导体物理]