摘要
首次报道了室温和非共振条件下,分子束外延(MBE)生长的CdTe/ZnTe超晶格的喇曼散射测量和分析。观察到最低级次的CdTe和ZnTe纵光学声子限制模,并用应力和限制效应精确计算了频移,得到的ZnTe纵光学声子频移理论值与实验结果符合得较好。特别指出,当CdTe和ZnTe层厚小于2nm时,声子频移的限制效应不可忽略,对所测样品的喇曼全谱作了分析。
Raman scattering measurements of CdTe/ZnTe superlattices (SL) grown by molecular beam epitaxy (MBE) have been reported for the first time at room temperature and under off-resonance condition. The lowest confined longitudinal optical (LO) phonon modes of CdTe and ZnTe are observed. Theoretical frequeney shift in SL, accounting both for strain and confinement, is calculated accurately and in good agreement with the observed shift of ZnTe LO phonon. It is indicated especially that when the individual layer thickness of CdTe and ZnTe is less than 2nm, the confinement effect of phonon frequency shift can not be neglected.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第3期169-174,共6页
Journal of Infrared and Millimeter Waves
基金
国家自然科学基金~~
关键词
超晶格
喇曼散射
分子束外延
superlattices, Raman scattering, LO phonons.
