短波长纳米ZnO/MgO准一维光电材料的晶格振动及电子-声子相互作用耦合特性  

Crystal-lattice Vibration and Electron-phonon Coupling Properties of Quasi-1-dimensional Short Wave-length ZnO/MgO Optoelectronic Nano-materials

作　　者：张立[1] 

机构地区：[1]广州番禺职业技术学院电子与机械系,广州番禺511483

出　　处：《广州番禺职业技术学院学报》2009年第4期44-49,共6页Guangzhou Panyu Polytechnic

基　　金：国家自然科学基金项目(60906042);广州番禺职业技术学院青年科技项目(Q09-33)资助

摘　　要：基于介电连续模型与Loudon单轴晶体模型,研究了短波长纤锌矿氧化锌(ZnO)材料与闪锌矿氧化镁(MgO)晶体构成的准一维ZnO/MgO纳米线结构的晶格振动特性及相关的电子-声子相互作用耦合函数。结果表明,在准一维ZnO/MgO圆柱形纳米线体系中存在两种极化光学声子模,即界面模与准受限模。均给出了结构中的这两种声子模的声子态及其色散方程。而且,也导出了基于场的量子化方案,体系解析的电子-声子相互作用耦合函数。结果对进一步研究准一维ZnO/MgO纳米线体系的极化子效应对结构的光电子特性的影响具有重要意义。Based on the dielectric continuue and Loudon＇s unaxial crystal models, the crystal-lattice vibration properties and electron-phonon coupling functions are investigated in a quasi-l-dimensional short wave-length ZnO/MgO cylindrical nanowire with wurtzite ZnO and zinc-blende MgO. The result reveals that there exists two types of polar optical phonon modes, i.e. the interface optical phonon modes and thee quasi-confined optical phonon modes, in the ZnO/MgO nanowire structures. The analytical phonon states and dispersive equations of the two phonon modes are given. Moreover, via the method of field quantization, the analytical electron-phonon coupling functions of the structures are also deduced. The results obtained in this paper are quite important for further investigations of polaronic effect on the optoelectronic properties in the ZnO/MgO nanowires.

关 键 词：准一维纳米材料 ZnO/MgO异质结 晶格振动 电子-声子耦合 

分 类 号：TN204[电子电信—物理电子学]