纤锌矿三元混晶多层异质材料中电-声子相互作用及其相关问题

项目名称： 纤锌矿三元混晶多层异质材料中电-声子相互作用及其相关问题

项目编号： No.61274098

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 班士良

作者单位： 内蒙古大学

项目金额： 70万元

中文摘要： 本项目拟从晶格动力学和微观原子模型出发，探讨纤锌矿三元混晶(重点为氮化物)多层异质结构材料中各类晶格振动（即声子，包括光学和声学声子）模式，获得电-声子相互作用哈密顿量，细致讨论材料的介电性质、晶格振动、能带及电子有效质量等物理参数随混晶组分的变化关系乃至界面的影响。进而研究系统中杂质态和激子态的光学极化子效应，电子子带跃迁和光学声子辅助跃迁的光学吸收过程，光学和声学声子对载流子平行、垂直界面方向输运的散射作用，以及应力和应变的调制作用；探讨电场（含自发极化、压电极化效应导致的内建电场及外场）、磁场对上述电子态的影响。以期解释和预言新物理现象，推动本领域的实验和理论发展，指导新材料的探索和器件研制。

中文关键词： 三元混晶；多层异质材料；电-声子相互作用；纤锌矿；

英文摘要： Based on lattice dynamics and microscopic atomic model, this proposal aims theoretical investigation of different kinds of lattice vibrations (i.e., phonons, including optical and acoustic phonons) in multilayered heterostructure materials consisting of wurtzite ternary mixed crystals (the keystones are nitrides) to obtain the Hamiltonians of electron-phonon interactions. The material parameters such as dielectric properties, lattice vibrations, energy bands and electronic effective masses, etc., as functions of mixed crystal compositions and the effect of interfaces are discussed in detail. Optical polaron effects on impurity states and excitons states in these systems are further studied, meanwhile, the optical absorption of carrier subband transitions and assistant transition due to optical phonons are also studied. The effects of scattering from optical and acoustic phonons on properties of electron transport parallel and perpendicular to interfaces are investigated. The modifications by stress and strain are included in the above contents. Furthermore, the influences on electron states mentioned above from electric fields (including the built-in electric field induced by spontaneous and piezoelectric polarizations and external fields) and magnetic fields are discussed as well. It is expected to explain and

英文关键词： Ternary mixed crystal；Multilayered heterostructure material；Electron-phonon interaction；Wurtzite；