ZnSe∶Fe^(2+)中的动态Jahn-Teller效应和远红外光谱的研究  

Study of the Dynamic Jahn-Teller Effect and the Far-infrared Spectra in ZnSe∶Fe ^( 2+)*

作　　者：周一阳[1] 

机构地区：[1]四川师范大学固体物理研究所,成都610066

出　　处：《Chinese Journal of Chemical Physics》2002年第6期401-404,共4页化学物理学报（英文）

基　　金：国家自然科学基金(10247006);四川省教育厅重点科研基金资助项目.

摘　　要：推导了 3d4 / 3d6离子基态 5D在立方晶体场、自旋 轨道耦合和动态Jahn Teller效应作用下的哈密顿矩阵 ,并用对角化该哈密顿矩阵的方法研究了Fe2 + 在ZnSe中的远红外光谱 ,理论计算与实验符合得好 .研究表明 ,在ZnSe∶Fe2 + 中 ,比晶体场理论分析多出的分裂谱线是Fe2 + 与ZnSe晶格间的动态Jahn Teller效应引起的 .还预测了其它Jahn Teller效应分裂谱 .所推导的哈密顿矩阵对研究 3d4 / 3d6离子在立方晶体中的精细光谱、电子顺磁共振谱和动态Jahn Teller分裂都是有用的 .A great interest has been recently devoted to the Van Vleck semimagnetic semiconductors which exhibit interesting magnetic and magnetooptical properties. However, the far-infrared spectra in the Van Vleck semimagnetic semiconductors ZnSe∶Fe 2+ do not fit the standardized crystal-field theory and in particular exhibit additional lines. The Hamiltonian matrices for the ground state 5D of 3d4/3d6 ions are derived by taking into account the cubic crystal field interaction, the spin-orbit coupling and the dynamic Jahn-Teller effect, as well as the far-infrared spectra of ZnSe∶Fe 2+ are studied by using these matrices. The theoretical results being in good agreement with the experimental observations indicate that the far-infrared spectrum levels in ZnSe∶Fe 2+, which do not exist for the standard crystal-field theory, are due to the dynamic Jahn-Teller effect in this crystal. In addition, some theoretical Jahn-Teller splittings presented are in need of further theoretical and experimental studies. The present matrix is useful for the study of fine structure spectra, EPR parameters and dynamic Jahn-Teller splittings of 3d4/3d6 ions in the cubic crystal field.

关 键 词：动态Jahn-Teller效应 远红外光谱 ZNSE 硒化锌 半导体 铁离子 掺杂 Fe(Ⅱ) 

分 类 号：O472.3[理学—半导体物理]