摘要
PbSe films were grown on(111)-oriented BaF_(2)substrates by using molecular beam epitaxy.High resolution x-ray diffraction characterization showed good crystalline quality of PbSe films.Both longitudinal optical phonon at 135cm^(-1)and transverse optical phonon at 47.6cm-1 were observed by Raman scattering measurements.The Raman tensor calculation demonstrates that both transverse-optical and longitudinal-optical(LO)phonons in PbSe crystal are Raman active on(111)-oriented surface,Furthermore,2LO phonon at about 270cm^(-1)and polaron at about 800cm^(-1)in PbSe,were also observed.The observed Raman frequencies are in good agreement with theoretical calculations using point ion model.
作者
杨爱龄
吴惠桢
李志锋
邱东江
常勇
李剑锋
P.J.McCann
X.M.Fang
YANG Ai-ling;WU Hui-Zhen;LI Zhi-Feng;QIU Dong-Jiang;CHANG Yong;LI Jian-Feng;P.J.McCann;X.M.Fang(Department of Information Science and Electronic Engineering;Department of Physics,Zhejiang University,Hangzhou 310028;Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083;The University of Oklahoma,Norman,Oklahoma,73019-23,USA)
基金
Supported in part by the National Natural Science Foundation of China under Grant No.69606006
Oklahoma Center for the Advancement of Science and Technology(OCAST#AR6-054).
