磁场中多原子晶体中极化子的激发能量  

Excitation Energy of Polaron for Polyatomic Crystals in Magnetic Field

作　　者：王成舜[1] 刘亚民[1] 肖景林[2] 

机构地区：[1]内蒙古呼伦贝尔学院,内蒙古海拉尔021008 [2]内蒙古民族大学,内蒙古通辽028043

出　　处：《发光学报》2003年第4期363-366,共4页Chinese Journal of Luminescence

基　　金：内蒙自然科学基金资助项目(99009)

摘　　要：研究磁场中多原子晶体中极化子的激发态的性质。采用线性组合算符和幺正变换方法,分别导出强、弱耦合情形下磁极化子的激发能量和平均声子数。结果表明,磁极化子的激发能量和平均声子数不仅包括不同支LO声子与电子耦合的贡献,而且还存在不同支LO声子间相互作用所贡献的附加项。With the development of the theory of the solid science and experimental technology,the research the properties of magnetopolaron in crystals has been of considerable interest.Peeters and Devreese studied the properties of magnetopolaron using a Feynman's path integral method.Wei and coworkers studied the induced potential and the selfenergy of an interface magentopolaron interacting with bulk LO phonons as well as interface optical phonons using the Greenfunction method.Zorkani et al.calculated the ground state energy of bound magnetopolaron using variational method.If consider the interaction between phonons of different wave vectors in the recoil process,the magneticfield dependence of cyclotron resonance frequency,induced potential,the effective interaction potential,and the cyclotronresonance mass of the surface magnetopolaron is obtained by using a linear combination operator and perturbation method by one of the authors.The magnetic field and temperature dependence of the mass of a surface magnetopolaron in polar crystals has been discussed by a linear combination operator method by present authors.Most polar crystals are diatomic and cubic and their crystal structure belongs to NaCl,CsCl or ZnS type.The research of these methods only was restricted to the case of crystals having only one mode of the longitudinal optical(LO)phonon.The properties of crystals have been studied by a great variety number of polar crystals,with several atoms per unit cell,have more than one LO phonon branch.For example,in cuprite such as CuO2,there are two LO phonon modes.SiO2,GaAs1-xPx and a large number of perovskites(SrTiO3,BaTiO3,LiNbO3,etc.)have more than two modes.The polaron problem with many LO phonon branches has been studied.The properties of polaron and magnetopolaron in polyatomic polar crystals are discussed by the method of a linear combination operator by one of the authors.However,the influences of magnetic field on the prope

关 键 词：多原子晶体 磁场 磁极化子 激发能量 激发态 线性组合算符 幺正变换 平均声子数 LO声子 光学声子 

分 类 号：O737[理学—晶体学] O734