静压下GaN/AlN应变超晶格的晶格动力学研究  

Lattice Dynamics of Strained GaN/AlN Superlattices under Hydrostatic Pressure

作　　者：郭子政[1] 阎祖威[1] 

机构地区：[1]内蒙古大学理工学院物理系

出　　处：《内蒙古大学学报（自然科学版）》2004年第3期269-273,共5页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金资助项目(10264003;60166002).

摘　　要：利用弹性理论计算出静压下应变超晶格两种组分材料的纵向晶格常数的改变,并用来修正应变存在时的面间力常数.在此基础上研究了应变对GaN/AlN超晶格的L-声子的色散关系和振动模式的影响.结果表明,应变可以在一定程度上破坏GaN和AlN中L-声子的准限制模式.另外静压对L-声子的色散关系影响显著,而对原子的振动模式影响较小.The changes of the longitudinal lattice constants of the strained superlattices are calculated according to the elastic theory and are used as the scaling of the planar force constants with strain. Based on this, the lattice dynamics of the GAN/AlN superlattice is studied. It is shown that some quasi-confinement modes obtained in the GaN/AlN Superlattice without considering the strain have been destroyed in some degree when considering the strain effects. The pressure has much influence on the dispersion relation of the superlattices. The displacement patterns remain unchanged with the variation of pressure.

关 键 词：晶格动力学 GaN/A1N超晶格 静压 应变 

分 类 号：O733.1[理学—晶体学] O472.91