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.
出处
《湖南师范大学自然科学学报》
EI
CAS
北大核心
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)
