超晶格基元的声子结构  

Study on Phonon Structure in Unit Cell of Superlattice

作　　者：黄建平[1] 周心一[1] 谢可夫[1] 

机构地区：[1]湖南师范大学计算机教学部计算物理研究室,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2004年第1期35-38,共4页Journal of Natural Science of Hunan Normal University

基　　金：湖南省教育厅科研基金资助项目(29020553)

摘　　要：应用Dyson方程推导了超晶格基元的声子格林函数,并以此为基础研究了超晶格基元的声子结构.计算结果表明,由于表面与界面效应,在超晶格基元中,声子能带分裂为一系列微带,在界面耦合力常数较大时,还出现了界面局域声子模.The phonon Green's function of unit cell in superlattice is deduced with Dyson's equation, on the basis of this result, the phonon structure in unit cell of superlattice is studied. It is found that because of the surface and interface effects, the energy band of phonon splits into a series of minibands, and localized phonon appears near interface when the couple force constant is large enough.

关 键 词：超晶格 声子结构 晶格动力学 格林函数 界面效应 界面局域声子模 

分 类 号：O73[理学—晶体学]